Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Sales	$ 629	$ 613	$ 591	$ 557	$ 594	$ 577	$ 569	$ 545	$ 2,390	$ 2,285	$ 2,084
Sales at a point in time
Disaggregation of Revenue [Line Items]
Sales									2,346
Franchised revenues transferred over time
Disaggregation of Revenue [Line Items]
Sales									44
North America
Disaggregation of Revenue [Line Items]
Sales									1,816
Europe, Middle East and Africa ("EMEA")
Disaggregation of Revenue [Line Items]
Sales									181
Asia Pacific
Disaggregation of Revenue [Line Items]
Sales									285
Latin America
Disaggregation of Revenue [Line Items]
Sales									108
Quick Lubes
Disaggregation of Revenue [Line Items]
Sales									822
Quick Lubes | North America
Disaggregation of Revenue [Line Items]
Sales									822
Quick Lubes | Europe, Middle East and Africa ("EMEA")
Disaggregation of Revenue [Line Items]
Sales									0
Quick Lubes | Asia Pacific
Disaggregation of Revenue [Line Items]
Sales									0
Quick Lubes | Latin America
Disaggregation of Revenue [Line Items]
Sales									0
Core North America
Disaggregation of Revenue [Line Items]
Sales									994
Core North America | North America
Disaggregation of Revenue [Line Items]
Sales									994
Core North America | Europe, Middle East and Africa ("EMEA")
Disaggregation of Revenue [Line Items]
Sales									0
Core North America | Asia Pacific
Disaggregation of Revenue [Line Items]
Sales									0
Core North America | Latin America
Disaggregation of Revenue [Line Items]
Sales									0
International
Disaggregation of Revenue [Line Items]
Sales									574
International | North America
Disaggregation of Revenue [Line Items]
Sales									0
International | Europe, Middle East and Africa ("EMEA")
Disaggregation of Revenue [Line Items]
Sales									181
International | Asia Pacific
Disaggregation of Revenue [Line Items]
Sales									285
International | Latin America
Disaggregation of Revenue [Line Items]
Sales									108
Company-owned operations | Quick Lubes
Disaggregation of Revenue [Line Items]
Sales									531
Non-company owned operations | Quick Lubes
Disaggregation of Revenue [Line Items]
Sales									291
Retail | Core North America
Disaggregation of Revenue [Line Items]
Sales									543
Installer and other | Core North America
Disaggregation of Revenue [Line Items]
Sales									$ 451