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Stock Incentive Plans - Sumamry of Performance Shares/units Granted (Details) - Performance Shares [Member] - $ / shares
shares in Millions
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period, start date Oct. 01, 2018 Oct. 01, 2017 Oct. 01, 2016
Vesting period, end date Sep. 30, 2021 Sep. 30, 2020 Sep. 30, 2019
Target shares granted [1] 78 101 56
Weighted-average fair value per share [1] $ 84.93 $ 68.93 $ 103.72
[1] At the end of the performance period, the actual number of shares/units awarded can range from zero to 200% of the target shares/units granted, which is assumed to be 100%. Both the shares granted and weighted-average fair value per share/unit are as of the grant date and have not been adjusted for the Valvoline separation that occurred during 2017.