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Litigation, Claims and Contingencies - Summary of Components of Environmental Remediation Expense Included within Selling, General and Administrative Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Loss Contingencies [Line Items]        
Environmental expense $ 2 $ 3 $ 3 $ 7
Legal expense 0 0 1 2
Total expense 2 3 4 9
Insurance receivable 0 0 (1) (1)
Total expense, net of receivable activity [1] $ 2 $ 3 $ 3 $ 8
[1] Net expense of zero for the three and six months ended March 31, 2025 and zero and $1 million for the three and six months ended March 31, 2024, respectively, relates to divested businesses which qualified for treatment as discontinued operations for which certain environmental liabilities were retained by Ashland. These amounts are classified within the income (loss) from discontinued operations, net of income taxes caption of the Statements of Condensed Consolidated Comprehensive Income (Loss).