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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 45
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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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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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

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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- Definition

Business Acquisition, Number Of Service Center Stores

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Number of Franchise Locations

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Goodwill and Other Intangibles - Summary of Goodwill by Segment (Details) $ in Millions		6 Months Ended
	Oct. 02, 2017 franchise	Mar. 31, 2018 USD ($) service_center_store franchise	Mar. 31, 2017 service_center_store franchise
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 330
Acquisitions		34
Dispositions		(1)
Goodwill, ending balance		$ 363
Number of franchise locations acquired \| franchise		59	5
Number of service center stores \| service_center_store		61	33
Core North America
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 89
Acquisitions		0
Dispositions		0
Goodwill, ending balance		89
Quick Lubes
Goodwill [Roll Forward]
Goodwill, beginning balance		201
Acquisitions		34
Dispositions		(1)
Goodwill, ending balance		$ 234
Number of service center stores \| service_center_store		5
International
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 40
Acquisitions		0
Dispositions		0
Goodwill, ending balance		40
Henley Bluewater, LLC
Goodwill [Roll Forward]
Goodwill, ending balance		$ 40
Number of franchise locations acquired \| franchise	56
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Quick Lubes
Goodwill [Roll Forward]
Number of service center stores \| service_center_store		2