Equity Method Investments - Summarized Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Financial position
Current assets	$ 116	$ 105
Current liabilities	(76)	(69)
Working capital	40	36
Noncurrent assets	23	25
Noncurrent liabilities	(1)	(1)
Stockholders’ equity	62	60
Results of operations
Sales	313	289	$ 255
Income from operations	62	53	46
Net income	27	25	23
Amounts recorded by Valvoline
Equity income	14	12	12
Distributions received	10	8	16
Royalty income	8	7	4
Sales to	12	12	10
Purchases from	$ 2	$ 0	$ 0