Goodwill and Other Intangibles - Summary of Goodwill by Segment (Details) $ in Millions	9 Months Ended
Jun. 30, 2021 USD ($) service_center_store
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 445
Acquisitions	203
Goodwill, Written off Related to Sale of Business Unit	10
Currency translation	3
Goodwill, ending balance	$ 641
Number of service center stores acquired in single and multi-store transactions \| service_center_store	121
Business Disposition, Number of Service Centers Sold \| service_center_store	12
Retail Services
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 316
Acquisitions	201
Goodwill, Written off Related to Sale of Business Unit	10
Currency translation	3
Goodwill, ending balance	$ 510
Number of service center stores acquired in single and multi-store transactions \| service_center_store	107
Global Products
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 129
Acquisitions	2
Goodwill, Written off Related to Sale of Business Unit	0
Currency translation	0
Goodwill, ending balance	$ 131

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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-Publisher FASB
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of divestiture 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 Acquired In Single And Multi-Store Transactions

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