Reportable Segment Information - Sales and Operating Income by Reportable Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Sales	$ 613	$ 577	$ 1,761	$ 1,691
Operating income	102	102	285	290
Quick Lubes
Segment Reporting Information [Line Items]
Sales	211		600
Core North America
Segment Reporting Information [Line Items]
Sales	260		735
International
Segment Reporting Information [Line Items]
Sales	142		426
Operating Segments
Segment Reporting Information [Line Items]
Operating income	106	99	300	304
Operating Segments | Quick Lubes
Segment Reporting Information [Line Items]
Sales	211	167	600	479
Operating income	48	38	130	111
Operating Segments | Core North America
Segment Reporting Information [Line Items]
Sales	260	264	735	773
Operating income	38	41	109	130
Operating Segments | International
Segment Reporting Information [Line Items]
Sales	142	146	426	439
Operating income	20	20	61	63
Unallocated and Other
Segment Reporting Information [Line Items]
Operating income	$ (4)	$ 3	$ (15)	$ (14)