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Fair Value Measurements - Summary of Investment Income, Net Unrealized Gains and Losses, Realized Gains and Disbursements Related to Investments (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Fair Value Disclosures [Abstract]      
Investment income $ 10 [1] $ 8 [1] $ 9
Net unrealized gains (losses) [2] 7 18 25
Realized gains [3] 0 6 2
Disbursements $ (32) $ (33) $ (27)
[1] Investment income relates to the demand deposit and includes interest income as well as dividend income transferred from the equity and corporate bond mutual funds.
[2] Ashland determined that all unrealized gains and losses were related to equity securities with readily determinable fair values. Due to the new accounting guidance adopted in the first quarter of fiscal year 2019, the net unrealized losses during the year ended September 30, 2019 were recorded within the net interest and other expense (income) caption in the Statements of Consolidated Income (Loss). In 2018 and 2017 these net unrealized gains (losses) were in AOCI.
[3] Relates only to the years ended September 30, 2018 and 2017 prior to adoption of the new accounting guidance for equity securities.