Reportable Segment Information - Disaggregation of Revenues by Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Sales	$ 578	$ 591	$ 1,185	$ 1,148
Quick Lubes
Segment Reporting Information [Line Items]
Sales	212	200	430	389
Quick Lubes | Operating Segments
Segment Reporting Information [Line Items]
Sales	212	200	430	389
Quick Lubes | Company-owned operations | Operating Segments
Segment Reporting Information [Line Items]
Sales	140	128	282	252
Quick Lubes | Non-company owned operations | Operating Segments
Segment Reporting Information [Line Items]
Sales	72	72	148	137
Core North America
Segment Reporting Information [Line Items]
Sales	238	243	486	475
Core North America | Operating Segments
Segment Reporting Information [Line Items]
Sales	238	243	486	475
Core North America | Retail | Operating Segments
Segment Reporting Information [Line Items]
Sales	133	140	270	256
Core North America | Installer and other | Operating Segments
Segment Reporting Information [Line Items]
Sales	105	103	216	219
International
Segment Reporting Information [Line Items]
Sales	128	148	269	284
International | Operating Segments
Segment Reporting Information [Line Items]
Sales	$ 128	$ 148	$ 269	$ 284