Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Financial position
Current assets	$ 123	$ 116
Current liabilities	(77)	(76)
Working capital	46	40
Noncurrent assets	23	23
Noncurrent liabilities	(2)	(1)
Stockholders’ equity	67	62
Results of operations
Sales	309	313	$ 289
Income from operations	59	62	53
Net income	24	27	25
Amounts recorded by Valvoline
Equity income	12	14	12
Distributions received	9	10	8
Royalty income	9	8	7
Sales to	12	12	12
Purchases from	$ 4	$ 2	$ 0