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Discontinued Operations (Details) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) stores	Dec. 31, 2017 USD ($) stores	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Apr. 06, 2017 USD ($) stores	Jan. 18, 2017 stores
Goodwill	$ 1,430	$ 1,430	$ 1,550	$ 1,694
Intangible assets, net	$ 768	768	775
Number of stores | stores					207
Goodwill, Impairment charges, including discontinued operations		387
Impairment in goodwill		(102)	(227)
Non-cash unit based compensation expense		24	13	8
Tangible Asset Impairment Charges		4
Portfolio Optimization Plan [Member]
Number of stores | stores						97
7-Eleven sales [Member]
Number of stores | stores					1,030
Business acquisition, total purchase price					$ 3,300
Transaction cost		37
Non-cash unit based compensation expense		$ 6
Sold store [Member] | Portfolio Optimization Plan [Member]
Number of stores | stores	40	40
Stores under contract [Member] | Portfolio Optimization Plan [Member]
Number of stores | stores	5	5
stores on market [Member] | Portfolio Optimization Plan [Member]
Number of stores | stores	11	11
Other entities [Member] | Sold store [Member] | Portfolio Optimization Plan [Member]
Number of stores | stores	9	9
7-Eleven sales [Member] | Sold store [Member] | Portfolio Optimization Plan [Member]
Number of stores | stores	32	32
Retail Segment [Member]
Goodwill	$ 678	$ 678	780	$ 1,007
Impairment in goodwill		102	(227)
Discontinued Operations, Held-for-sale [Member]
Goodwill	796	796	1,068
Intangible assets, net	477	$ 477	$ 480
Impairment in goodwill	$ (23)

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