Reportable Segment Information - Sales and Operating Income by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Sales	$ 569	$ 514	$ 1,114	$ 1,003
Operating income (loss)	100	100	188	194
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	108	106	205	206
Operating Segments | Core North America
Segment Reporting Information [Line Items]
Sales	258	253	509	490
Operating income (loss)	46	57	89	108
Operating Segments | Quick Lubes
Segment Reporting Information [Line Items]
Sales	158	128	312	255
Operating income (loss)	38	31	73	60
Operating Segments | International
Segment Reporting Information [Line Items]
Sales	153	133	293	258
Operating income (loss)	24	18	43	38
Unallocated and Other
Segment Reporting Information [Line Items]
Operating income (loss)	$ (8)	$ (6)	$ (17)	$ (12)