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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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