Goodwill and Other Intangibles - Summary of Goodwill (Details) $ in Millions	12 Months Ended
Sep. 30, 2018 USD ($) service_center_store	Sep. 30, 2017 USD ($) service_center_store	Sep. 30, 2016 USD ($) service_center_store
Goodwill [Line Items]
Number of service center stores \| service_center_store	136	43	104
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 330	$ 264
Acquisitions	52	66
Dispositions	(1)
Goodwill, ending balance	381	330	$ 264
Core North America
Goodwill [Roll Forward]
Goodwill, beginning balance	89	89
Acquisitions	0	0
Dispositions	0
Goodwill, ending balance	$ 89	$ 89	89
Quick Lubes
Goodwill [Line Items]
Number of service center stores \| service_center_store	7	15
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 201	$ 135
Acquisitions	52	66
Dispositions	(1)
Goodwill, ending balance	$ 252	201	135
Quick Lubes \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Goodwill [Line Items]
Number of quick lube service center stores sold \| service_center_store	2
International
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 40	40
Acquisitions	0	0
Dispositions	0
Goodwill, ending balance	$ 40	$ 40	$ 40

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Business Acquisition, Number Of Service Center Stores

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