Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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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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Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through a franchise arrangement having an indefinite period of benefit.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Acquisitions and Dispositions - Additional Information (Details) $ in Millions		1 Months Ended	3 Months Ended	6 Months Ended
	Oct. 02, 2017 USD ($) franchise	Dec. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2018 USD ($) service_center_store franchise	Mar. 31, 2017 USD ($) service_center_store franchise	Nov. 30, 2017	Sep. 30, 2017 USD ($)
Business Acquisition [Line Items]
Number of service center stores \| service_center_store				61	33
Consideration for acquisition				$ 67	$ 48
Number of franchise locations acquired \| franchise				59	5
Goodwill acquired				$ 363			$ 330
Weighted average remaining term				7 years
Proceeds from disposal				$ 5	$ 0
Gain on sale				4	$ 0
Henley Bluewater, LLC
Business Acquisition [Line Items]
Consideration for acquisition	$ 60
Number of franchise locations acquired \| franchise	56
Goodwill acquired				40
Reacquired franchise rights				$ 24
Purchase accounting adjustment, increase in finite lived intangible assets			$ (6)
Thailand
Business Acquisition [Line Items]
Equity method ownership percentage						70.00%
Additional ownership percentage of joint venture, purchased		30.00%
Consideration paid to acquire additional interest in subsidiary		$ 16
Quick Lubes
Business Acquisition [Line Items]
Number of service center stores \| service_center_store				5
Goodwill acquired				$ 234			$ 201
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Quick Lubes
Business Acquisition [Line Items]
Number of service center stores \| service_center_store				2
Proceeds from disposal				$ 5
Gain on sale				$ 3