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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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