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Related-Party Transactions - Additional Information (Details) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 25, 2012 store | Mar. 31, 2018 USD ($) agreement | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2016 store
Related Party Transaction [Line Items] |  |  |  |  |
Related products purchase agreements | agreement |  | 2 |  |  |
Purchase agreements renewal term |  | 12 months |  |  |
Receivables from affiliates |  | $ 160 |  | $ 155 |
Accounts payable to affiliates |  | 178 |  | $ 206 |
Revenues |  | $ 3,749 |  |  |
Philadelphia Energy Solutions Refining and Marketing [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related products purchase agreements | agreement |  | 1 |  |  |
Merrill Lynch Commodities [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related products purchase agreements | agreement |  | 1 |  |  |
Susser [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Distribution agreement term |  | 10 years |  |  |
Purchase option term | 3 years |  |  |  |
Number of convenience stores | store | 75 |  |  |  |
Commercial agreement, initial term | 15 years |  |  |  |
Exclusive distributor, term | 10 years |  |  |  |
Number of convenience stores, sale lease back transactions completed | store |  |  |  |  | 75
Sunoco Retail LLC [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Distribution agreement term |  | 10 years |  |  |
Continuing Operations [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Repayment of Line of credit |  | $ 1,179 | $ 857 |  |
Revenues |  | 3,749 | 2,808 |  |
Continuing Operations [Member] | Wholesale Motor Fuel [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenues |  | 3,094 | 2,244 |  |
Merchandise cost of sales |  | 2,945 | 2,143 |  |
Affiliated Entity [Member] | Continuing Operations [Member] | Wholesale Motor Fuel [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenues |  | 12 | 21 |  |
Merchandise cost of sales |  | $ 777 | $ 545 |  |

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