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Discontinued Operations Narrative (Details) $ in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2018 USD ($) store	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jan. 18, 2017 store
Goodwill, Impairment Loss				$ 387
Number of Stores | store		47			97
Goodwill		$ 1,430		1,430
Non-cash unit based compensation expense	[1]	$ 3	$ 4
Store under Contract [Member]
Number of Stores | store		1
Store sales to 7-Eleven [Domain]
Number of Stores | store		32
Store Sold to Other Entities [Domain]
Number of Stores | store		9
Store on Market [Domain]
Number of Stores | store		8
Retail Segment [Member]
Goodwill, Impairment Loss				$ (102)
Goodwill		$ 678
7-Eleven sales [Member]
Business Acquisition, Transaction Costs		$ 1
[1] (1)Includes amounts from discontinued operations.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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