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Related-Party Transactions - Additional Information (Details) $ in Millions		3 Months Ended	12 Months Ended
	Sep. 25, 2012 stores	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) agreement	Dec. 31, 2016 USD ($) stores	Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items]
Number Of Agreements | agreement			2
Commercial Agreement Renewal Term			12 months
Equity issued to partners capital account			$ 0	$ 255	$ 1,008
Advances From Affiliates, Noncurrent			85	87
Receivables from affiliates			155	3
Accounts payable to affiliates			$ 206	$ 109
Philadelphia Energy Solutions Refining And Marketing [Member]
Related Party Transaction [Line Items]
Number Of Agreements | agreement			1
Merrill Lynch Commodities [Member]
Related Party Transaction [Line Items]
Number Of Agreements | agreement			1
Susser [Member]
Related Party Transaction [Line Items]
Commercial Agreement Distribution Agreement Term			10 years
Commercial Agreement Purchase Option Term	3 years
Commercial Agreement Number Of Convenience Stores In Purchase Option | stores	75
Commercial Agreement Initial Term	15 years
Commercial Agreement Exclusive Distributor Term	10 years
Commercial Agreement Number Of Convenience Stores Sale Lease Back Transactions Completed | stores				75
Sunoco Retail LLC [Member]
Related Party Transaction [Line Items]
Commercial Agreement Distribution Agreement Term			10 years
Philadelphia Energy Solutions [Member]
Related Party Transaction [Line Items]
Percentage of purchases from related party on total cost of sales			19.60%	20.30%	20.80%
Philadelphia Energy Solutions [Member]
Related Party Transaction [Line Items]
Percentage Of Equity Interest			33.00%
Subsequent Event [Member] | PES Holdings, LLC [Member]
Related Party Transaction [Line Items]
Equity issued to partners capital account		$ 260
Payment for Debt Extinguishment or Debt Prepayment Cost		$ 35
Percentage Of Equity Interest		25.00%
Partners' Capital Account, Contributions		$ 65
Subsequent Event [Member] | PES Holdings, LLC [Member] | Carlyle Group, L.P. [Member]
Related Party Transaction [Line Items]
Percentage Of Equity Interest		16.26%
Subsequent Event [Member] | PES Holdings, LLC [Member] | ETP [Member]
Related Party Transaction [Line Items]
Percentage Of Equity Interest		8.13%
Subsequent Event [Member] | PES Holdings, LLC [Member] | Sunoco Logistics Partners Operations L.P. [Member]
Related Party Transaction [Line Items]
Repayments of Debt		$ 75

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