Goodwill and Other Intangibles - Summary of Goodwill (Details) $ in Millions	12 Months Ended
Sep. 30, 2021 USD ($) numberOfFormerFranchiseCenters	Sep. 30, 2020 USD ($) numberOfFormerFranchiseCenters	Sep. 30, 2019 USD ($) service_center_store
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 445	$ 430
Acquisitions	207	17
Goodwill, Foreign Currency Translation Gain (Loss)	2	1
Dispositions	(10)	(3)
Goodwill, ending balance	$ 644	$ 445	$ 430
Business Disposition, Number of Service Centers Sold \| numberOfFormerFranchiseCenters	12	6
Number of service center stores acquired in single and multi-store transactions	134		24
Retail Services [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 316	$ 301
Acquisitions	205	17
Goodwill, Foreign Currency Translation Gain (Loss)	2	1
Dispositions	(10)	(3)
Goodwill, ending balance	513	316	$ 301
Global Products [Member]
Goodwill [Roll Forward]
Goodwill, beginning balance	129	129
Acquisitions	2	0
Goodwill, Foreign Currency Translation Gain (Loss)	0	0
Dispositions	0	0
Goodwill, ending balance	$ 131	$ 129	$ 129
Retail Services [Member]
Goodwill [Roll Forward]
Number of service center stores acquired in single and multi-store transactions \| numberOfFormerFranchiseCenters	120

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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