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Stock-Based Compensation Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Stock appreciation rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unexercised SARs lapsing period	10 years
Aggregate intrinsic value of shares exercised	$ 1	$ 2	$ 1
Unrecognized compensation costs	$ 1
Unrecognized compensation costs weighted average period related to nonvested awards	1 year 10 months 24 days
Stock appreciation rights \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Stock appreciation rights \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Nonvested stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 5
Unrecognized compensation costs weighted average period related to nonvested awards	3 years 2 months 12 days
Grant date fair values of shares vested	$ 10	$ 6	$ 1
Aggregate intrinsic value	$ 24
Nonvested stock awards \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Nonvested stock awards \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Performance awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Unrecognized compensation costs	$ 3
Unrecognized compensation costs weighted average period related to nonvested awards	1 year 9 months 18 days
Aggregate intrinsic value	$ 9
Valvoline Inc. Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (in shares)	21,000,000
Number of shares remaining under the plan (in shares)	16,000,000