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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
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Environmental Expense And Liabilities [Abstract]      
Environmental expense $ 30 $ 60 $ 17
Accretion 1 1 1
Legal expense 6 6 8
Total expense 37 67 26
Insurance receivable (3) (2) (2)
Total expense, net of receivable activity [1] $ 34 $ 65 $ 24
[1] Net expense of $7 million, $5 million and $3 million for the fiscal years ended September 30, 2019, 2018 and 2017, respectively, related to divested businesses which qualified for treatment as discontinued operations and for which certain environmental liabilities were retained by Ashland. These amounts are classified within the income from discontinued operations caption of the Statements of Consolidated Comprehensive Income (Loss).