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Mergers and Acquisitions - Other Acquisitions (Narrative) (Details) $ in Millions				12 Months Ended
	Oct. 12, 2016 USD ($) location property	Jun. 22, 2016 USD ($) restaurant stores tract property	Dec. 16, 2015 USD ($) property	Dec. 31, 2015 USD ($)	Apr. 06, 2017 stores
Business Acquisition [Line Items]
Number of stores | stores					207
Denny Oil Company [Member]
Business Acquisition [Line Items]
Consideration transferred	$ 55
Number of company-operated locations | location	6
Number of dealer-operated locations | location	6
Change in goodwill	$ 19
Number of fee properties | property	13
Kolkhorst Petroleum Inc [Member]
Business Acquisition [Line Items]
Change in goodwill		$ 19
Number of fee properties | property		5
Number of leased properties | property		9
Valentine Stores Inc [Member]
Business Acquisition [Line Items]
Number of company-operated locations | stores		18
Change in goodwill		$ 42
Number of fee properties | property		19
Number of tracts of land | tract		3
Alta East, Inc [Member]
Business Acquisition [Line Items]
Consideration transferred			$ 57
Change in goodwill			$ 19
Number of fee properties | property			24
Number of leased properties | property			6
Number of fee and leased property non operating surplus | property			2
Other Acquisition [Member]
Business Acquisition [Line Items]
Consideration transferred				$ 66
Change in goodwill				$ 13
TEXAS | Kolkhorst Petroleum Inc [Member]
Business Acquisition [Line Items]
Consideration transferred		$ 39
Number of stores | stores		14
NEW YORK | Valentine Stores Inc [Member]
Business Acquisition [Line Items]
Consideration transferred		$ 78
Number of stores | stores		18
Tim Hortons Restaurant [Member] | Valentine Stores Inc [Member]
Business Acquisition [Line Items]
Number of restaurants | restaurant		1
Number of leased properties | property		1

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-Name Accounting Standards Codification
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