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Disclosure - Reportable Segment Information - Summary of Financial Information for Each Reportable Segment (Details) link:presentationLink link:calculationLink link:definitionLink 996455 - Disclosure - Reportable Segment Information - Summary of Financial Information for Each Reportable Segment (Parenthetical) (Details) link:presentationLink link:calculationLink link:definitionLink Proceeds from disposal of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from Sale of Property, Plant, and Equipment, Total Cellulosics [Member] Cellulosics. Cellulosics [Member] Other Postretirement Benefit Plan, Defined Benefit [Member] Retirement Plan Type [Axis] Segments Segments [Domain] X Director [Member] X director. X Director [Member] Environmental Cost Policy Environmental Costs, Policy [Policy Text Block] Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Loss from continuing operations Beginning balance Ending balance Restructuring Reserve Restructuring Reserve, Total Severance Liability Concentration Risk Type [Axis] Concentration Risk Type 2021 Accelerated Share Repurchase Agreement [Member] Two thousand twenty one accelerated share repurchase agreement. Two Thousand Twenty One Accelerated Share Repurchase Agreement [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Valvoline Inc. Valvoline [Member] Valvoline Inc [Member] Balance Sheet Location Statement of Financial Position Location, Balance [Domain] Inventories Disposal Group, Including Discontinued Operation, Inventory, Current Actual contributions to benefit plans in period Defined Benefit Plan, Plan Assets, Contributions by Employer Schedule Of Cash Paid For Amount Included In Measurement Of Operating Lease Liabilities Table [Text Block] Schedule of cash paid for amount included in measurement of operating lease liabilities. Schedule of Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities Long-term debt - Note H Long-term debt (less current portion) Long-Term Debt, Excluding Current Maturities Long-term Debt, Excluding Current Maturities, Total Equity [Abstract] Entity Current Reporting Status Entity Current Reporting Status Goodwill, Gross Pre-impairment goodwill Composites Or Marl Facility [Member] Composites or Marl facility. Composites/Marl Facility [Member] Accounts receivable, net Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Litigation, Claims and Contingencies Commitments and Contingencies Disclosure [Text Block] Finite-Lived Intangible Asset, Expected Amortization, Year Four 2030 Earnings Per Share, Basic [Abstract] Basic earnings (loss) per share - Note M Product and Service [Axis] Product and Service Document Fiscal Period Focus Document Fiscal Period Focus Debt instrument, interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage Revenue from Contract with Customer [Abstract] Claims dismissed Loss Contingency, Claims Dismissed, Number Entity Shell Company Entity Shell Company Pre tax gain on excess tax paid Pre Tax Gain On Excess Tax Paid Pre-tax gain Segment Reporting Segment Reporting, Policy [Policy Text Block] Cash and cash equivalents Cash and Cash Equivalent Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Ending Balance Disposal Group Not Discontinued Operation Property Plant And Equipment Disposal Group Not Discontinued Operation Property Plant And Equipment Sale of properties with net book value Amount of net gain recognized in net periodic benefit cost due to settlements, curtailments and other expense. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. Defined Benefit Plan Recognized Net Gain Due To Settlements Curtailments And Other Curtailment loss Accrued expenses and other liabilities Disposal Group Including Discontinued Operation Accrued Expenses And Other Liabilities Current Disposal group including discontinued operation accrued expenses and other liabilities current. Receivable Type Receivable Type [Axis] Progression Of Activity In Asbestos Litigation Reserve Accounts [Table Text Block] Progression of activity in asbestos litigation reserve accounts. Progression of Activity in Asbestos Litigation Reserves Accounts Foreign Pension Plans, Defined Benefit [Member] Foreign Plan [Member] Asset Class Asset Class [Domain] Statement [Table] Statement [Table] Increases related to positions taken in the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Right-of-use assets exchanged for new operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Statement [Line Items] Statement [Line Items] Number of sites subject to various environmental laws. Number Of Sites Subject To Various Environmental Laws Number of sites were company is identified as a potentially responsible party under the superfund or similar state law Entity Filer Category Entity Filer Category Two thousand twenty two stock repurchase program Two Thousand Twenty Two Sock Repurchase Program [Member] 2022 Stock Repurchase Program [Member] Disposal Group, Including Discontinued Operation, Intangible Assets, Current Amount allocated to Avoca business Lease liability percentage Lease liability percentage. Lease Liability Percentage Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Liabilities and Equity Total liabilities and equity Debt Instrument [Line Items] Debt Instrument [Line Items] Current portion of long-term debt Long-Term Debt, Current Maturities Long-Term Debt, Current Maturities, Total Foreign currency derivatives Foreign Currency Contract, Asset, Fair Value Disclosure AMORTIZATION EXPENSE Amortization Amortization, Total Amortization expense Long-Term Debt, Maturity, Year Three 2029 Cost of sales Disposal Group, Including Discontinued Operation, Costs of Goods Sold Restructuring Type [Axis] Restructuring Type Long-Lived Tangible Asset [Axis] Severance Liability Severance Costs Restructuring and Related Costs [Table Text Block] Summary of Amount of Restructuring Severance Expense and Liabilities Related to Programs Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block] Summary of Net Losses on Derivatives Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Remaining Confirmed Invoices Remaining confirmed invoices. Remaining confirmed invoices Confirmed invoices paid Confirmed Invoices Paid Confirmed invoices paid. Schedule Of Stock Repurchase Activity [Table Text Block] Schedule of Stock Repurchase Activity Schedule of stock repurchase activity. Goodwill Goodwill - Note G Balance at beginning of period Balance at end of period Goodwill, Total Goodwill Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent, Total Effective tax rate (in hundredths) Disbursements Disbursements Demand Deposit The cash outflow of all demand deposits, including checking and negotiable order or withdrawal (NOW) accounts. Schedule of Foreign Exchange Contracts, Statement of Financial Position [Table Text Block] Summary of Net Gains on Foreign Currency Derivatives Geographical Geographical [Domain] Finished products Inventory, Finished Goods, Gross Inventory, Finished Goods, Gross, Total Noncurrent assets Assets, Noncurrent [Abstract] Total other comprehensive income (loss), before tax Other Comprehensive Income (Loss), before Tax Other Comprehensive Income (Loss), before Tax, Total Summary of Inventories Schedule of Inventory, Current [Table Text Block] Confirmed invoices Confirmed Invoices Confirmed invoices. Earnings Per Share from Continuing Operations [Abstract] Earnings Per Share from Continuing Operations [Abstract] EPS from continuing operations Supply Chain Finance Program [Member] Supply Chain Finance Program. Useful life (in years) Finite-Lived Intangible Asset, Useful Life Share Repurchase Program [Axis] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent, Total Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Unrealized gain on commodity hedges Disaggregation Of Revenue [Table] Disaggregation of Revenue [Table] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Computation of Basic and Diluted Earnings (Loss) per Share Trademarks and Trade Names [Member] Trademarks and Trade Names [Member] Restricted investments Restricted Cash and Investments Restricted Cash and Investments, Total Property, plant and equipment Property, Plant and Equipment, Net [Abstract] Numerator Numerator [Abstract] Numerator. Company-owned life insurance payments Payment to Acquire Life Insurance Policy, Investing Activities Nonvested Stock Awards [Member] Share-Based Payment Arrangement [Member] Earnings Per Share, Basic Net loss Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Equity Funds [Member] Equity Mutual Fund [Member] Restricted Securities [Member] Restricted securities. Gross Cash Proceeds Received For Accounts Receivables Transferred Gross cash proceeds received for accounts receivables transferred. Gross cash proceeds received for accounts receivable transferred Employee Benefit Plans Retirement Benefits [Text Block] Environmental Remediation Expense, before Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration] Environmental Remediation Expense, before Recovery, Statement of Income or Comprehensive Income [Extensible Enumeration] Disclosure Of Sales Program Of Receivable [Line Items] Disclosure Of Sales Program Of Receivable [Line Items] Disclosure of sales program of receivable. Unrealized translation gain (loss), net of tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Unrealized translation gain (loss) Revolving Credit Facility [Member] Revolving Credit Facility [Member] Retirement Plan Type Retirement Plan Type [Domain] Total current liabilities Liabilities, Current Trade and other payables Disposal Group, Including Discontinued Operation, Accounts Payable, Current Accelerated Share Repurchases [Line Items] Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Adjustments to reconcile loss from continuing operations to cash flows from operating activities: 2025 Restructuring program Two Thousand Twenty Five Restructuring Program [Member] Two thousand twenty five restructuring program. Percentage of fairvalue reduction Percentage of fairvalue reduction. Hedging Designation Hedging Designation [Domain] Goodwill, Written off Related to Sale of Business Unit Avoca business - divestiture Amount allocated to Avoca disposal group Share Repurchase Program [Domain] Intermediates. Intermediates [Member] Operating lease obligations Disposal group, including discontinued operation, current operating lease obligations, current Disposal Group, Including Discontinued Operation, Current Operating Lease Obligations, Current Asbestos Trust [Member] Asbestos trust. Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Increases related to positions taken in the prior year Option Indexed to Issuer's Equity, Strike Price Shares of warrants with a strike price Product Concentration Risk [Member] Product Concentration Risk [Member] Consolidation Items Consolidation Items [Domain] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Unrealized gain on commodity hedges, tax Entity Small Business Entity Small Business Summary of Fair Values of Outstanding Foreign Currency Derivatives Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Hedging Designation Hedging Designation [Axis] Cash-settled Performance Shares [Member] Cash Settled Performance Shares [Member] Cash-settled Performance Shares [Member] Commodity Contract [Member] Commodity Derivatives [Member] Schedule Of Goodwill And Finite Lived Intangible Assets [Line Items] Schedule Of Goodwill And Finite Lived Intangible Assets [Line Items] Schedule of goodwill and finite lived intangible assets. Accretion Accretion Expense Other Current Assets [Member] Other Current Assets [Member] Stock Incentive Plans Share-Based Payment Arrangement [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Two Thousand Twenty Three Restructuring Program [Member] Two thousand twenty three restructuring program. 2023 Restructuring program Leases [Abstract] Lessee Lease Description [Line Items] Lessee, Lease, Description [Line Items] Amendment Flag Amendment Flag Product and Service [Domain] Product and Service Loss Contingencies [Line Items] Loss Contingencies [Line Items] Inventories Inventory Disclosure [Text Block] Earnings Per Share, Policy [Policy Text Block] Earnings (Loss) Per Share Current assets held for sale Current assets held for sale - Note B Disposal Group, Including Discontinued Operation, Assets, Current Prior Fiscal Year [Member] Prior Fiscal Year [Member] Prior fiscal year. Liabilities and Equity [Abstract] LIABILITIES AND EQUITY Reclassification, Type [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Long-Term Debt, Maturity, Year One 2027 Finite-Lived Intangible Asset, Acquired-in-Place Leases Lease asset Lessee, Operating Lease, Liability, to be Paid, Year Three 2025 Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Summary of Fair Values of Outstanding Derivatives Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Loss contingency reserve allowance for credit losses. Loss Contingency Reserve Allowance For Credit Losses Total allowance for credit losses Schedule of Available-for-sale Securities [Line Items] Debt Securities, Available-for-Sale [Line Items] Accelerated Share Repurchases [Table] Personal Care [Member] Personal care and household. Personal Care And Household [Member] Personal Care & Household [Member] Fair Value Disclosure Item Amounts [Default] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] [Default] Pension contributions Payment for Pension Benefits Entity Address, Address Line One Entity Address, Address Line One Deferred income taxes Deferred Income Taxes and Tax Credits Deferred Income Taxes and Tax Credits, Total Non-Rule 10b5-1 Trading Plan [Member] Non-Rule 10b5-1 Trading Plan [Member] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Earnings Per Share [Abstract] Commodity derivatives Derivative Asset Derivative Asset, Total Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Other Intangible Assets Accrued Expenses and Other Liabilities [Member] Other Liabilities [Member] Balance Sheet Location Statement of Financial Position Location, Balance [Axis] Operating lease assets, net - Note I Total lease assets Total lease assets Operating lease assets, net Distribution [Member] Ashland Distribution [Member] Ashland distribution. Purchases of securities Payments to Acquire Debt Securities, Available-for-Sale Inventory Disclosure [Abstract] Gain (Loss) on Sale of Investments Gain (Loss) on Sale of Investments, Total (Income) loss from restricted investments Sales Disposal Group, Including Discontinued Operation, Revenue Document Type Document Type Gross profit Gross Profit Personal care. Personal Care [Member] Personal Care [Member] Entity Central Index Key Entity Central Index Key Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Allowance for credit losses on Accounts receivable, net Rule 10b5-1 Trading Plan [Member] Rule 10b5-1 Trading Plan. Common Stock Dividends Per Share Cash Paid Increase Common stock dividends per share cash paid increase. Common stock dividends per share cash paid increase Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Fiscal 2023 Life Sciences Restructuring Program [Member] Fiscal 2023 Life Sciences restructuring program [Member] Fiscal 2023 Life Sciences restructuring program. Subsequent Event Type [Domain] Antidilutive securities excluded from calculation of earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Consolidated net leverage ratio Consolidated Leverage Ratio Consolidated leverage ratio. Disposal Group Classification [Domain] Reconciliation Of Changes In Stockholders Equity [Line Items] Reconciliation Of Changes In Stockholders Equity. CASH PROVIDED (USED) BY CONTINUING OPERATIONS Cash Provided by (Used in) Continuing Operation Polyvinylpyrrolidones [Member] Polyvinylpyrrolidones. Polyvinylpyrrolidones (PVP) [Member] PVP [Member] Liabilities Liabilities Liabilities [Abstract] Goodwill [Line Items] Goodwill [Line Items] Adjusted cost Debt Securities, Available-for-Sale, Amortized Cost Retirement Plan Sponsor Location Retirement Plan Sponsor Location [Domain] Available-for-sale securities, fair value Fair value Debt Securities, Available-for-sale, Total Fair Value Cash used by discontinued operations Cash Provided by (Used in) Discontinued Operation [Abstract] Summary of Reconciliation of Changes in Stockholders' Equity Schedule of Stockholders Equity [Table Text Block] Schedule Of Goodwill And Finite Lived Intangible Assets [Table] Schedule Of Goodwill And Finite Lived Intangible Assets [Table] Schedule of goodwill and finite lived intangible assets. Debt Disclosure [Abstract] Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital Change in operating assets and liabilities Increase (Decrease) in Operating Capital, Total Estimate of Fair Value, Fair Value Disclosure [Member] Estimate of Fair Value Measurement [Member] Notional contract values Derivative, Notional Amount Accrued expenses and other liabilities Accrued Liabilities, Current Accrued Liabilities, Current, Total Cost of Sales [Member] Cost of Sales [Member] Current Fiscal Year End Date Current Fiscal Year End Date Debt Instrument [Table] Schedule of Long-Term Debt Instruments [Table] Cellulosics And Polyvinylpyrrolidones [Member] Cellulosics and Polyvinylpyrrolidones. Cellulosics and PVP [Member] Document Quarterly Report Document Quarterly Report Customer Relationships [Member] Customer and Supplier Relationships [Member] Customer Lists [Member] Entity Address, State or Province Entity Address, State or Province Insurance receivable Insurance settlement Increase (Decrease) in Insurance Settlements Receivable Insurance receivable Line of credit facility, remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Proceeds from (Repayments of) Short-Term Debt Proceeds from (Repayments of) Short-term Debt, Total Repayment of short-term debt Covenant restrictions [Abstract] Covenant Restrictions [Abstract] States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure. Gross Unrealized Gain Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Description of completed or expected disposal(s) group, the gain or loss recognized in the income statement and the income statement caption that includes that gain or loss, amounts of revenues and pretax profit or loss reported in earnings, the segment in which the disposal group was reported, and the classification and carrying value of the assets and liabilities comprising the disposal group. 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Income Tax Reconciliation Tax Expense And Benefit Tax reform (benefit) and expense Tax (benefit) and expense Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Components of Pretax Stock-Based Compensation Expense Included in Continuing Operations Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Number of current and former operating facilities subject to various environmental laws Number Of Current And Former Operating Facilities Subject To Various Environmental Laws Number of current and former operating facilities subject to various environmental laws Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss), net of tax Performance Shares [Member] Performance Shares [Member] Basic Income (Loss) from Continuing Operations, Per Basic Share Income (Loss) from Continuing Operations, Per Outstanding Share, Total Loss from continuing operations Deferred income taxes Deferred Income Tax Assets, Net Deferred Income Tax Assets, Net, Total Other Postretirement Benefit Plan, Defined Benefit [Member] Other Postretirement Benefits Plan [Member] Long-term debt, fair value Long-Term Debt, Fair Value Subsequent Event [Member] Subsequent Event [Member] Long-Term Debt, Maturity, Remainder of Fiscal Year Remaining in 2026 Other Assets, Noncurrent, Total Other assets Other Assets, Noncurrent Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Proceeds from sale of securities Proceeds from Sale of Debt Securities, Available-for-Sale Common shares issued Reconciliation Of Changes In Stockholders Equity Stock Issued During Period Shares New Issues Reconciliation of changes in stockholders equity stock issued during period shares new issues. Accumulated other comprehensive income (loss) [Member] AOCI Attributable to Parent [Member] Accumulated other comprehensive loss [Member] Per Share Data Per Share Data [Abstract] Derivative Liability, Total Derivative Liability Commodity derivatives Finite-Lived Intangible Assets, Major Class Name Finite-Lived Intangible Assets, Major Class Name [Domain] Reconciliation Of Changes In Stockholders Equity [Table] Reconciliation Of Changes In Stockholders Equity. Scheduleof Finite Lived Infinite Lived Intangible Assets Table [Text Block] Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite and infinite life, by major class. Summary of Other Intangible Assets Goodwill impairment charges Goodwill, Impairment Loss Impairment Goodwill impairment - Note G Components of Amounts in the Statements of Consolidated Income (Loss) Related To Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Selling, general and administrative expense Selling, General and Administrative Expense Selling, General and Administrative Expense, Total Selling, general and administrative expense - Note Q Minimum [Member] Minimum [Member] Financial Instrument Financial Instrument [Axis] Total return swap assets Foreign currency derivative assets Derivative Asset, Fair Value, Gross Asset, Total Commodity derivative assets Current assets Assets, Current [Abstract] Real Estate [Member] Real Estate [Member] Total other comprehensive income (loss), tax Other Comprehensive Income (Loss), Tax Other Comprehensive Income (Loss), Tax, Total Reserve adjustment Increase (decrease) in asbestos related reserve SEC Schedule, 12-09, Valuation Allowances and Reserves, Increase (Decrease) Adjustment Intangibles amortization expense - Note G Amortization of Intangible Assets Amortization of Intangible Assets, Total Other intangibles amortization expense Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Sale of properties with net book value Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Expected future amortization expense [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Share Repurchase Program [Line Items] Segment Reporting [Abstract] Summary of Financial Instruments Subject to Recurring Fair Value Measurements Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Accrued environmental loss contingencies, noncurrent Accrued Environmental Loss Contingencies, Noncurrent Tax Period Tax Period [Domain] Current liabilities Liabilities, Current [Abstract] Restructuring Activities Restructuring and Related Activities Disclosure [Text Block] Recorded Third-Party Environmental Recoveries Receivable Recorded third-party environmental recoveries receivables Total cash used by discontinued operations Cash Provided by (Used in) Discontinued Operation Reimbursements from restricted investments Proceeds from Sale of Restricted Investments Accounts Receivable, after Allowance for Credit Loss, Current Accounts Receivable, after Allowance for Credit Loss, Current, Total Accounts receivable, net - Note H Commitments and Contingencies Commitments and contingencies - Note I and L Service cost Defined Benefit Plan, Service Cost Intermediates [Member] Intermediates and Solvents [Member] Intermediates And Solvents [Member] Intermediates and Solvents [Member] Rule 10b5-1 Trading Plan Two [Member] Rule 10b5-1 Trading Plan Two. Total present value of lease payments Operating Lease, Liability Operating lease obligations Total lease liabilities Hercules [Member] Hercules Limited Liability Company [Member] Hercules Limited Liability Company. Short-term debt - Note H Short-term debt Short-Term Debt Short-term Debt, Total Summary of Goodwill by Reportable Segment Schedule of Goodwill [Table Text Block] Decrease in unrecognized tax benefits is reasonably possible Decrease in Unrecognized Tax Benefits is Reasonably Possible Concentration Risk Benchmark [Axis] Concentration Risk Benchmark Cash Provided by (Used in) Financing Activity, Continuing Operation [Abstract] CASH FLOWS USED BY FINANCING ACTIVITIES FROM CONTINUING OPERATIONS Long-Term Debt, Maturity, Year Two 2028 Lessee Lease Description [Table] Lessee, Lease, Description [Table] U.S. Accounts Receivable Sales Program [Member] U S Accounts Receivable Sales Program [Member] U.S. accounts receivable sales program. Consolidated interest coverage ratio Consolidated Interest Coverage Ratio Consolidated interest coverage ratio. Noncurrent liabilities Liabilities, Noncurrent [Abstract] Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Effect of currency exchange rate changes on cash and cash equivalents Interest Income (Expense), Net, Total Net interest and other expense Interest Income (Expense), Operating Net interest and other expense (income) Net interest and other expense Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net loss Net loss Net loss Current liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Current Current liabilities held for sale - Note B Other net periodic benefit loss - Note K Other defined benefit plan net periodic benefit income expense. 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Subsequent Events Subsequent Events [Text Block] Long-Term Debt Long-term debt (less debt issuance costs) Long-term debt (less debt issuance costs) Common shares purchased under repurchase program Reconciliation Of Changes In Stockholders Equity Stock Purchased Under Repurchase Program Reconciliation of changes in stockholders equity stock purchased under repurchase program. Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] Net decrease to retained earnings Equity, Attributable to Parent Stockholders' Equity Attributable to Parent, Total Balance, end of period Balance, beginning of period Equity - Note N Estimated future contributions in current fiscal year Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Income (loss) on acquisitions and divestitures, net Income (Loss) on Acquisitions And Divestitutres, Net income (loss) on acquisitions and divestitures, net. Reconciliation of Changes in Environmental Contingencies and Asset Retirement Obligations Reserve Reconciliation Of Changes In Environmental Contingencies And Asset Retirement Obligations Reserve Table [Text Block] Tabular disclosure of the changes in the environmental contingencies and asset retirement obligations reserve. Raw materials, supplies and work in process Inventory, Work in Process and Raw Materials Inventory, Work in Process and Raw Materials, Total Foreign currency derivatives Foreign Currency Contracts, Liability, Fair Value Disclosure Restructuring Severance Costs [Member] Restructuring severance costs. 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Severance Income and Costs Severance income (expenses) Severance expense (income) United States Pension Plans of US Entity, Defined Benefit [Member] UNITED STATES Debt Instrument, Name Debt Instrument, Name [Domain] Other assets Other Assets, Current Other current assets Long-Term Debt, Maturity, Year Four 2030 Pension Cost (Reversal of Cost) Loss on pension plan remeasurements Summary of Changes in Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share, Total Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Income from discontinued operations Environmental Remediation Obligations [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Income (Loss) on Divestitutres, Net Income (loss) on divestitutres, net. Income (loss) on divestitures, net Entity Entity [Domain] Unamortized debt issuance expense, long-term debt Unamortized Debt Issuance Expense Long Term Debt The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective long-term debt and presented as a direct reduction to long-term debt. Disposal group including discontinued operation research and development expense. Disposal Group Including Discontinued Operation Research And Development Expense Research and development expense Latin America & Other [Member] Latin America And Other [Member] Latin america and other. Tax Period Tax Period [Axis] Payments For Proceeds From Restricted Cash And Investments Payments for proceeds from restricted cash and investments. Funds restricted for specific transactions Specialty Additives [Member] Specialty Additives [Member] Specialty additives. Avoca [Member] Avoca. Collateral Held [Axis] Collateral Held Customer Lists [Member] Customer Lists [Member] Pension Plan [Member] Pension Plan [Member] Other Corporate Member Other corporate. Other Corporate [Member] Disposal Group Name Disposal Group Name [Domain] Investment Income [Table] Foreign Exchange Contract [Member] Foreign Exchange Contract [Member] Entity Address, City or Town Entity Address, City or Town Common shares repurchased (in shares) Stock Repurchased During Period, Shares Common shares repurchased Number of reportable segments Number of Reportable Segments Security Exchange Name Security Exchange Name Europe [Member] Europe [Member] Indefinite-lived intangible assets Indefinite-Lived Intangible Assets (Excluding Goodwill) Indefinite-lived Intangible Assets (Excluding Goodwill), Total Indefinite-lived Intangible Assets (Excluding Goodwill), Beginning Balance Indefinite-lived Intangible Assets (Excluding Goodwill), Ending Balance Thereafter Lessee Operating Lease Liability Payments Due After Year Four Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fourth fiscal year following latest fiscal year. Operating Lease Assets Net [Member] operating lease assets net. Operating Lease Assets Net [Member] Long-term debt, carrying value Carrying value of debt Long-Term Debt, Gross Cost Property, Plant and Equipment, Gross Property, Plant and Equipment, Gross, Total Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Ending Balance Property plant and equipment Intersegment Eliminations Intersegment Eliminations [Member] Revenue From Contract With Customers [Table] Revenue From Contract With Customers [Table] Revenue from contract with customers. Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Loss from continuing operations before income taxes Common Stock and Paid in Capital [Member] Common Stock Including Additional Paid in Capital [Member] Concentration Risk Type [Domain] Concentration Risk Type EBITDA Earnings Before Interest Tax Depreciation And Amortization Earnings before interest, tax, depreciation and amortization. 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Measurement Basis Measurement Basis [Axis] Statistical Measurement Statistical Measurement [Domain] Restricted Investments, Current Restricted Cash and Investments, Current Restricted Cash and Investments, Current, Total Total current assets Assets, Current Current assets Stock-based compensation Share-Based Payment Arrangement, Expense Document Period End Date Document Period End Date Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Components of Environmental Remediation Expense Components Of Environmental Remediation Expense Table [Text Block] Tabular disclosure of the components of environmental remediation expense. 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Schedule Of Available For Sale Securities 1 [Table] Accelerated depreciation Restructuring and Related Cost, Accelerated Depreciation Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Financial Instruments Financial Instruments [Domain] Y Director [Member] Y director. Y Director [Member] Composites Segment and the Intermediates and Solvents Marl Facility [Member] Composites Segment And Intermediates And Solvents Marl Facility [Member] Composites segment and the Intermediates and Solvents Marl facility. Possible total future litigation defense and claim settlement costs Loss Contingency, Estimate of Possible Loss 6.875% Notes due 2043 [Member] Six Point Eight Seven Five Percentage Notes Due2043 [Member] Six point eight seven five percentage notes due 2043. Restructuring reserve Restructuring Reserve, Accrual Adjustment Derivative Liability, Statement of Financial Position [Extensible Enumeration] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Lessee, Operating Lease, Liability, to be Paid, Year Two 2024 Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Two thousand eighteen stock repurchase program. Two Thousand Eighteen Stock Repurchase Program [Member] 2018 Stock Repurchase Program [Member] Asbestos reserve Total reserves for asbestos claims SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Asbestos litigation reserves - beginning of year Asbestos litigation reserves - end of period Gross carrying amount Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross, Total Denominator for diluted EPS - Adjusted weighted-average shares and assumed conversions Weighted Average Number of Shares Outstanding, Diluted Entity File Number Securities Act File Number Cash dividends paid Payments of Ordinary Dividends, Common Stock Domestic Plan [Member] Cover [Abstract] Cover Number of service stations being actively remediated Number Of Service Stations Being Actively Remediated Number of service stations being actively remediated Cash-settled nonvested restricted stock awards. Cash-settled Nonvested Restricted Stock Awards [Member] Cash Settled Nonvested Restricted Stock Awards [Member] Total return swap gain (loss) Derivative, Gain (Loss) on Derivative, Net, Total Commodity derivative gain Commodity derivative losses Revenue Benchmark [Member] Sales Revenue [Member] Stock repurchase program amount outstanding. Stock Repurchase Program Amount Outstanding Stock repurchase program amount outstanding Reportable Segment Information Segment Reporting Disclosure [Text Block] Two thousand twenty two stock repurchase program. Two Thousand Twenty Two Stock Repurchase Program [Member] 2022 Stock Repurchase Program [Member] CASH FLOWS PROVIDED (USED) BY OPERATING ACTIVITIES FROM CONTINUING OPERATIONS Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Disclosure Of Sales Program Of Receivable [Table] Disclosure Of Sales Program Of Receivable [Table] Disclosure of sales program of receivable. Insurance receivable Insurance receivable - beginning of year Insurance receivable - end of period Loss Contingency, Receivable Loss Contingency, Receivable, Total Net carrying amount Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net, Beginning Balance Finite-Lived Intangible Assets, Net, Ending Balance Deferred income taxes Disposal Group Including Discontinued Operation Deferred Income Taxes Current Disposal group including discontinued operation deferred income taxes current. CASH FLOWS PROVIDED (USED) BY INVESTING ACTIVITIES FROM CONTINUING OPERATIONS Cash Provided by (Used in) Investing Activity, Continuing Operation [Abstract] Goodwill [Member] Goodwill [Member] Gross carrying amount Intangible Assets, Gross (Excluding Goodwill) Intangible Assets, Gross (Excluding Goodwill), Total Other intangible assets New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Schedule of Maturities Analysis of Lease Liabilities Current Fiscal Year [Member] Current Fiscal Year [Member] Current fiscal year. Estimated Litigation Liability, Noncurrent Asbestos litigation reserves - Note L Components of Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) [Table Text Block] Benefit (Loss) from Excess Tax Deduction on Stock Based Compensation Benefit (Loss) from Excess Tax Deduction on Stock Based Compensation Loss from excess tax deduction on stock based compensation Unrecognized Tax Benefits, Period Increase (Decrease) Unrecognized Tax Benefits, Period Increase (Decrease), Total Changes in unrecognized tax benefits Minimum required consolidated interest coverage ratio Minimum Consolidated Interest Coverage Ratio The minimum required consolidated interest coverage ratio under the debt instruments. DEPRECIATION EXPENSE Depreciation Depreciation, Total Depreciation expense Personal Care Facility [Member] Personal Care Facility [Member] Carrying (Reported) Amount, Fair Value Disclosure [Member] Reported Value Measurement [Member] Corporate Segment [Member] Corporate [Member] Life Sciences [Member] Life Sciences [Member] Life sciences. Current operating lease obligations - Note I Current operating lease obligations Operating Lease, Liability, Current Depreciation and amortization Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization, Total Document Transition Report Document Transition Report Research and development expense Research and Development Expense Research and Development Expense, Total Open claims - beginning of year Open claims - end of period Loss Contingency, Pending Claims, Number Summary of Lease Assets and Liabilities Schedule Of Lease Assets And Liabilities Table [Text Block] Schedule of lease assets and liabilities. Cost of Revenue, Total Cost of Revenue Cost of sales - Note Q Cost of sales Receivable Receivable [Domain] Leasing Arrangements Lessee, Operating Leases [Text Block] Repurchase of common stock Payments for Repurchase of Common Stock Asbestos reserve [Roll Forward] Asbestos Reserve Roll Forward A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive loss Employee benefit obligations - Note K Liability, Defined Benefit Plan, Noncurrent Liability, Defined Benefit Plan, Noncurrent, Total Statement of Cash Flows [Abstract] Reconciliation Of Changes In Stockholders Equity Profit Loss Reconciliation of changes in stockholders equity profit loss. Net income Net loss Number of Years Included in Asbestos Assumption Asbestos Assumption Period Asbestos assumption period. Derivative Asset, Statement of Financial Position [Extensible Enumeration] Equity Items Equity [Text Block] 6.50% Junior Subordinated Notes, Due 2029 [Member] Six Point Five Zero Percentage Junior Subordinated Notes Due2029 [Member] Six point Five Zero percentage junior subordinated notes, due 2029. Recorded third-party environmental recoveries, noncurrent Recorded Third-Party Environmental Recoveries, Noncurrent Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Earnings Per Share [Text Block] Earnings (Loss) Per Share Discontinued Operations and Disposal Groups [Abstract] Total Return Derivatives [Member] Equity Contract [Member] Operating lease cost Operating Lease, Cost Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Net gains Equity Securities, FV-NI, Unrealized Gain (Loss) Equity Securities, FV-NI, Unrealized Gain (Loss), Total Net gains (losses) Cash Provided by (Used in) Operating Activity, Continuing Operation Total cash flows provided (used) by operating activities from continuing operations Investment of captive insurance company Investments Of Captive Insurance Company Fair Value Disclosure This element represents the fair value of investments of a captive insurance company. Intangibles - Note G Net carrying amount Intangible Assets, Net (Excluding Goodwill) Net carrying amount Operating cash flows from operating leases Operating Lease, Payments Gain on sale of divestiture Net proceeds from sale of business Proceeds from sale of operations Assets ASSETS Assets [Abstract] Operating cash flows Cash Provided by (Used in) Operating Activity, Discontinued Operation Actuarial (gain) Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit Curtailment loss Restructuring and Related Activities [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Asia Pacific [Member] Asia Pacific [Member] Land and Building [Member] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark Regular dividends Reconciliation Of Changes In Stockholders Equity Dividends Common Stock Cash Reconciliation of changes in stockholders equity dividends common stock cash. Retirement Benefits [Abstract] Trade and other payables Accounts Payable, Current Accounts Payable, Current, Total Trade Receivable [Member] Trade Accounts Receivable [Member] Specialty Additives facility [Member] Specialty Additives Facility [Member] Specialty additives facility. Schedule of Components of Pension and Other Postretirement Benefit Costs for Continuing Operation Schedule of Net Benefit Costs [Table Text Block] Fair Value, off-Balance-Sheet Risk [Table] Gain (Loss) on Disposition of Business Loss on divestitures, net Restructuring Cost And Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Finite-Lived Intangible Asset, Expected Amortization, Year One 2027 Three Point Three Seven Five Percentage Senior Notes Due 2031 [Member] Three point three seven five percentage senior notes due 2031. 3.375% Senior Notes, due 2031 [Member] Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Claims settled Loss Contingency, Claims Settled, Number North America [Member] North America [Member] Lessee, Operating Lease, Liability, to be Paid, Year One 2023 Addtional impariment charges Addtional impariment charges. Water technologies. Water Technologies [Member] Water Technologies [Member] Ashland Securities Trading Plans [Member] Ashland securities trading plans Ashland Securities Trading Plans [Member] Total number of service station properties subject to various environmental laws Number Of Service Station Properties Subject To Various Environmental Laws Number of service station properties subject to various environmental laws. Trade receivables Contract with Customer, Asset, after Allowance for Credit Loss, Current Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total Debt Instrument Debt Instrument [Axis] Accrued Expenses and Other Liabilities [Member] Accrued Expenses and Other Liabilities [Member] Accrued expenses and other liabilities. Derivative Instrument Derivative Instrument [Axis] Interest cost Defined Benefit Plan, Interest Cost Share-Based Payment Arrangement [Abstract] Total assets at fair value Assets, Fair Value Disclosure Concentration Risk, Percentage Concentration risk percentage Amounts collected Loss Contingency, Receivable, Proceeds Intellectual Property [Member] Intellectual Property [Member] Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Total cash flows provided (used) by investing activities from continuing operations Reconciliation of changes in stockholders equity other comprehensive income loss foreign currency transaction and translation adjustment net of tax. Reconciliation Of Changes In Stockholders Equity Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Unrealized translation gain (loss) Title of 12(b) Security Title of 12(b) Security Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Maximum limit of receivables can transfer Maximum Limit Of Receivables For Sale Maximum limit of receivables for sale. Unallocated and Other [Member] Unallocated And Other [Member] Unallocated and other portion of Operating Income (Loss) to reconcile back to Operating income Share Repurchase Program, Remaining Authorized, Amount Stock Repurchase Program, Remaining Repurchase Amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Receivables sold under agreement Receivables Sold Under Agreement Receivables sold under agreement. Maximum reserve for remediation reserve related to any one site (in hundredths) Maximum Reserve For Remediation Reserve Related To Any One Site In Hundredths No individual remediation location is material, as the largest reserve for any site is less than __% of the remediation reserve. Ashland [Member] Ashland Global Holdings Inc [Member] Ashland Global Holdings Inc. Income Taxes Income Tax Disclosure [Text Block] Loss Contingency Insurance Receivable Increase Decrease Including Reserve Adjustment Loss contingency insurance receivable increase decrease including reserve adjustment. Receivable adjustment Receivable adjustment Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Remainder of 2022 Other liabilities Other Liabilities, Noncurrent Other Liabilities, Noncurrent, Total Total expense Environmental Remediation Expense, before Recovery Legal Entity Legal Entity [Axis] Letters of credit outstanding, amount Letters of Credit Outstanding, Amount Lease termination fee Lease Termination Fee. Lease Termination Fee Income Tax Disclosure [Abstract] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Aggregate purchase price Share Repurchase Program, Aggregate Purchase Price Share repurchase program, aggregate purchase price. Balance at beginning of period Balance at end of period Unrecognized Tax Benefits Unrecognized tax benefits Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount Income tax reconciliation, nondeductible goodwill impairment Goodwill and Intangible Assets, Intangible Assets, Indefinite-Lived Goodwill and Intangible Assets, Intangible Assets, Indefinite-Lived, Policy [Policy Text Block] Measurement Frequency Measurement Frequency [Domain] Aggregate amount of common stock to be repurchased Stock Repurchase Program, Authorized Amount Share Repurchase Program, Authorized, Amount Income Statement Location Statement of Income Location, Balance [Axis] Trading Symbol Trading Symbol Schedule Of Finite Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Subsequent Event Type [Axis] Fair Value, Measurements, Recurring [Member] Fair Value, Recurring [Member] Divestitures. Divestitures [Abstract] Total lease payments Lessee, Operating Lease, Liability, to be Paid Less amount of lease payment representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee Operating Lease Liability Undiscounted Excess Amount, Total Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Equity Components Equity Components [Axis] Maximum consolidated leverage ratio Maximum Consolidated Leverage Ratio The maximum consolidated leverage ratio permitted under the debt instruments. Receivable adjustment Loss Contingency Insurance Receivable Increase Decrease Loss contingency insurance receivable increase (decrease). Sales against the buyers limit Sales against the buyers limit Sales against the buyers limit Equity Component Equity Component [Domain] Asset Class Asset Class [Axis] Goodwill and Intangible Assets Disclosure [Abstract] Investment income Investment Income, Interest and Dividend Investment Income, Interest and Dividend, Total Z Director [Member] Z director. Z Director [Member] Statement of Comprehensive Income [Abstract] Finite and Indefinite Intangible assets [Abstract] Intangible Assets, Net [Abstract] Intangible Assets, Net (Excluding Goodwill) [Abstract] Maximum [Member] Maximum [Member] Liabilities, Fair Value Disclosure Total liabilities at fair value Statistical Measurement Statistical Measurement [Axis] Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Share Repurchase Program, Weighted-Average Price Per Share Share repurchase program, weighted-average price per share. Weighted-average price per share Property, Plant and Equipment [Member] Property, Plant and Equipment [Member] Performance Adhesives [Member] Performance Adhesives [Member] Performance adhesives. Finance Lease, Principal Payments Investing cash flows from finance leases Insurance Settlements Receivable, Noncurrent Asbestos insurance receivable, net - Note L Basis of Presentation Consolidation, Policy [Policy Text Block] Goodwill [Roll Forward] Goodwill [Roll Forward] Income Tax Contingency [Table] Income Tax Contingency [Table] COMPREHENSIVE INCOME (LOSS) Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Diluted Income (Loss) from Continuing Operations, Per Diluted Share Loss from continuing operations Nutraceuticals. Nutraceuticals [Member] Amortization of Debt Issuance Costs Original issue discount and debt issuance costs amortization Eric N Boni [Member] Eric N Boni. Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] Recorded liabilities related to service obligations and limited guarantee Recorded Liabilities Related To Service Obligations And Limited Guarantee Recorded liabilities related to service obligations and limited guarantee. Finite-Lived Intangible Assets by Major Class Finite-Lived Intangible Assets by Major Class [Axis] Acquisitions and Divestitures Mergers, Acquisitions and Dispositions Disclosures [Text Block] Schedule of Debt [Table Text Block] Summary of Long-term Debt Common shares issued under stock incentive and other plans Reconciliation Of Changes In Stockholders Equity Stock Issued During Period Value Share Based Compensation Reconciliation of changes in stockholders equity stock issued during period value share based compensation. Stock based compensation employee withholding taxes Stock based compensation employee withholding taxes paid in cash Payment, Tax Withholding, Share-Based Payment Arrangement Disbursements Accrual for Environmental Loss Contingencies, Payments Debt Security Category Debt Security Category [Axis] Foreign Accounts Receivable Sales Program [Member] Foreign accounts receivable sales program. Revenue Revenue from Contract with Customer [Text Block] Entity Registrant Name Entity Registrant Name Debt and Other Financing Activities Debt Disclosure [Text Block] Total expense, net of receivable activity Environmental Remediation Expense Net Of Receivable Activity Environmental remediation expense net of receivable activity. Gross Unrealized Loss Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Summary of Assets and Liabilities Held for Sale Summary Of Assets And Liabilities Held For Sale Table [Text Block] Summary of assets and liabilities held for sale. Finite-Lived Intangible Asset, Expected Amortization, Year Two 2028 Subsequent Events [Abstract] Reclassification, Type [Domain] Discontinued Operations, Held-for-Sale [Member] Discontinued Operations, Held-for-sale [Member] Finite-Lived Intangible Asset, Expected Amortization, Year Three 2029 Income tax expense (benefit) Income Tax Expense (Benefit) Income Tax Expense (Benefit), Total Income tax benefit - Note J Amount Transferred In Accounts Receivables Amount transferred in accounts receivables. Amount transferred in accounts receivable Measurement Frequency Measurement Frequency [Axis] Dividend per common share Dividend per common share Common Stock, Dividends, Per Share, Cash Paid Cash dividends declared per common share Reconciliation Of Changes In Stockholders Equity Common Stock Dividends Per Share Declared Reconciliation of changes in stockholders equity common stock dividends per share declared. Share Repurchase Programs [Table] Share repurchase programs. Summary of Percentage of Ashland's Total Consolidated Sales by Product Schedule of Product Information [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Proceeds from Life Insurance Policy Proceeds from settlement of Company-owned life insurance contracts Investment Income [Table Text Block] Summary of Investment Income, Net Gains and Losses, Funds restricted for Specific Transactions and Disbursements Related to Investments Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Disposal Group Classification [Axis] Consolidation Items Consolidation Items [Axis] Commitments and Contingencies Policy Commitments and Contingencies, Policy [Policy Text Block] Revenue From Contracts With Customers [Line Items] Revenue From Contracts With Customers [Line Items] Revenue from contracts with customers line items. Utilization (cash paid) Payments for Restructuring Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Payments to Acquire Property, Plant, and Equipment, Total Payment for (Proceeds from) Other Investing Activity Other investing cash flows Equity and other income Income Loss From Equity Method Investments And Other Income Expense Income (loss) from equity method investments and other income (expense). Total assets TOTAL ASSETS Assets Finite-Lived Intangible Assets, Net [Abstract] Finite-Lived Intangible Assets, Net [Abstract] Inventories Inventory, Policy [Policy Text Block] Income from affiliates Gain (Loss) From Affiliates Gain (loss) from affiliates. Income from affiliates Schedule Of Restructuring And Related Costs [Table] Restructuring Cost [Table] Fair Value of Financial Instruments Policy Fair Value of Financial Instruments, Policy [Policy Text Block] Number Of Reportable Segments Not Disclosed Flag Number of reportable segments not disclosed flag. Number of reportable segments not disclosed flag Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Decreases related to positions taken on items from prior years Legal expense Legal Fees Funds restricted for specific transactions. Funds restricted for specific transactions Funds Restricted for Specific Transactions Increase Decrease In Account Receivable Sales Volume Increase (decrease) in account receivable sales volume. Increase (decrease) in account receivable sales volume Selling General and Administrative Expenses [Member] Selling, General and Administrative Expenses [Member] Selling, General and Administrative Expenses [Member] Lease cost: Lease, Cost [Abstract] Earnings Per Share, Diluted [Abstract] Diluted earnings (loss) per share - Note M Business Combination [Abstract] Earnings Per Share, Diluted Net loss Summary of Financial Information for Each Reportable Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Operating Segments [Member] Disaggregation of Revenue [Abstract] City Area Code City Area Code Other comprehensive income (loss) - Note N Other comprehensive income Other Comprehensive Income (Loss), Net of Tax Other Other Short Term And Long Term Debt Other short term and long term debt. Income tax (expense) benefit Discontinued Operation, Tax Effect of Discontinued Operation Discontinued Operation, Tax Effect of Discontinued Operation, Total Aggregate principal amount Principal amount Debt Instrument, Face Amount Income (loss) from discontinued operations (net of tax) Loss from discontinued operations (net of income taxes) Income from discontinued operations Income (loss) from discontinued operations, net of income taxes Income from discontinued operations, net of income taxes Income from discontinued operations, net of income taxes - Note C Finite-Lived Intangible Asset Intangible Assets, Finite-Lived, Policy [Policy Text Block] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Progression of Insurance Receivable Progression Of Activity In Insurance Receivable Table [Text Block] Movement in the insurance receivable to cover asbestos claim settlements. Schedule Of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Other Intangible Assets [Member] Other Intangible Assets [Member] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Unrealized gain on commodity hedges, net of tax Variable lease cost Variable Lease, Cost Asbestos litigation cost projection [Abstract] Asbestos Litigation Cost Projection [Abstract] Asbestos litigation cost projection. Weighted average remaining operating lease term Operating Lease, Weighted Average Remaining Lease Term Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Disposal Group Name Disposal Group Name [Axis] Total lease cost Lease, Cost Gain (Loss) on Sale of Accounts Receivable loss on sale of receivables Loss on sale of receivables Foreign currency derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Derivative Liability, Fair Value, Gross Liability, Total Commodity derivative liabilities Environmental Remediation Costs Recognized [Abstract] Environmental Remediation Costs Recognized [Abstract] Net property, plant and equipment Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Property, plant and equipment, net Goodwill and Intangible Assets, Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Impairment of Intangible Assets, Finite-Lived Impairment charges CASH AND CASH EQUIVALENTS - END OF PERIOD Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total OPERATING INCOME (LOSS) Operating Income (Loss) Operating loss Operating income (loss) Goodwill, Foreign Currency Translation, Gain (Loss) Currency translation 2.00% Senior Notes Due 2028 [Member] Two Point Zero Zero Percentage Senior Notes Due2028 [Member] Two point zero zero percentage senior notes due 2028. Retained earnings [Member] Retained Earnings [Member] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Unrealized gain on commodity hedges, before tax Assets, Noncurrent Total noncurrent assets Stock based compensation expense Share-Based Payment Arrangement, Noncash Expense Share-based Payment Arrangement, Noncash Expense, Total Unrealized translation gain (loss), tax Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Total Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] Income (loss) from discontinued operations attributable to Performance Adhesives Restructuring and Related Cost, Number of Positions Eliminated Number of employess treminated in restructuring activities Total noncurrent liabilities Liabilities, Noncurrent Weighted average operating discount rate, percent Operating Lease, Weighted Average Discount Rate, Percent Operating lease obligations - Note I Non-current operating lease obligations Operating Lease, Liability, Noncurrent Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total cash flows used by financing activities from continuing operations Collateral Held Collateral Held [Domain] Components of Lease Cost Recognized Lease, Cost [Table Text Block] Deferred income taxes Deferred Income Tax Liabilities, Net Deferred Income Tax Liabilities, Net, Total Net expense relates to divested businesses Net Expense Related To Divested Businesses Net expense related to divested businesses. Marketable Securities [Table Text Block] Summary of Restricted Investment Portfolio Derivative Contract Derivative Contract [Domain] Accrual for environmental loss contingencies Accrual for Environmental Loss Contingencies Accrual for Environmental Loss Contingencies, Total Environmental remediation reserves - beginning of period Environmental remediation reserves - end of period Schedule Of Goodwill [Table] Goodwill [Table] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Reconciliation Of Changes In Stockholders Equity Unrealized Gain on Commodity Hedges Reconciliation of changes in stockholders equity unrealized gain on commodity hedges. Unrealized gain (loss) on commodity hedges Entity Interactive Data Current Entity Interactive Data Current Income Statement Location Statement of Income Location, Balance [Domain] Fair Value Measurement Fair Value Measurement [Domain] Unrealized translation gain (loss), before tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Total Selling, general and administrative expense Disposal Group, Including Discontinued Operation, General and Administrative Expense Reconciliation of changes in stockholders equity other. Reconciliation of Changes In Stockholders Equity Other Other Environmental Trust [Member] Environmental trust. Environmental Expense and Liabilities [Abstract] Entity Tax Identification Number Entity Tax Identification Number Kevin Willis [Member] Kevin Willis. Kevin Willis [Member] Long-term Debt, Type Long-Term Debt, Type [Axis] Pension and Other Postretirement Benefits Cost (Reversal of Cost) Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total Loss on pension and other postretirement plan remeasurements Debt instrument, maturity year Debt Instrument Maturity Year Debt instrument maturity year. Rule 10b5-1 Trading Plan One [Member] Rule 10b5-1 Trading Plan One. New claims filed Loss Contingency, New Claims Filed, Number Local Phone Number Local Phone Number Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Total net periodic benefit costs Other net periodic benefit gain (loss) Demand Deposit [Member] Demand Deposits [Member] Short-Term Lease, Cost Short-term leases Robin E. Lampkin [Member] Robin E. Lampkin. Accounting Policies [Abstract] Other Current Liabilities [Member] Other Current Liabilities [Member] Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down Impairment charge Disaggregation Of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revised obligation estimates and accretion Accrual for Environmental Loss Contingencies, Revision in Estimates Revised obligation estimates and accretion Revenue from Contract with Customer, Excluding Assessed Tax, Total Sales - Note P Sales SALES Restricted investments - Note E Restricted Cash and Investments, Noncurrent Restricted Cash and Investments, Noncurrent, Total Restricted Investments Allowance for credit losses Loss Contingency Reserve Adjustment Related To Allowance For Credit Losses Loss contingency reserve adjustment related to allowance for credit losses. Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward] Lessee, Operating Lease, Liability, to be Paid, Year Four 2026 Reinsurance Recoverable, Allowance for Credit Loss, Total Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance Reinsurance Recoverable, Allowance for Credit Loss Allowance for credit losses on Asbestos insurance receivable, net Amounts paid Liability for Asbestos and Environmental Claims, Gross, Payment for Claims Accumulated impairment Goodwill, Impaired, Accumulated Impairment Loss Entity Emerging Growth Company Entity Emerging Growth Company