Reportable Segment Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Sales	$ 2,981	$ 2,353	$ 2,390
Retail Services [Member]
Disaggregation of Revenue [Line Items]
Sales	1,221	883	822
Retail Services [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	1,221	883	822
Global Products [Member]
Disaggregation of Revenue [Line Items]
Sales	1,760	1,470	1,568
Global Products [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	1,760	1,470	1,568
Oil Changes | Retail Services [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	657	450	407
Non-oil Changes | Retail Services [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	205	141	124
Company Owned [Member] | Retail Services [Member]
Disaggregation of Revenue [Line Items]
Sales	862	591	531
Non Company Owned [Member] | Retail Services [Member]
Disaggregation of Revenue [Line Items]
Sales	359	292	291
Non Company Owned [Member] | Retail Services [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	309	252	248
Retail [Member] | Global Products [Member]
Disaggregation of Revenue [Line Items]
Sales	626	571	558
Installer And Other [Member] | Global Products [Member]
Disaggregation of Revenue [Line Items]
Sales	1,134	899	1,010
Lubricants | Global Products [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	1,570	1,287	1,364
Antifreeze | Global Products [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	119	104	121
Filters | Global Products [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	13	13	12
Chemicals and other | Global Products [Member] | Operating Segments
Disaggregation of Revenue [Line Items]
Sales	$ 58	$ 66	$ 71