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Acquisitions - Additional Information (Details) $ in Millions						3 Months Ended			4 Months Ended	12 Months Ended
	Oct. 12, 2016 USD ($) location property	Aug. 31, 2016 USD ($) Boe plant	Jun. 22, 2016 USD ($) restaurant tract property store	Mar. 31, 2016 USD ($) shares	Apr. 01, 2015 USD ($) shares	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Jan. 01, 2016
Business Acquisition [Line Items]
Percentage of membership interest acquired						100.00%
Revenues						$ 4,394	$ 3,215
Net income (loss)						1	62
Sunoco LLC and Sunoco Retail LLC [Member]
Business Acquisition [Line Items]
Business acquisition total purchase price					$ 775
Acquisition of business						$ 0	$ (2,200)
Sunoco Retail LLC [Member]
Business Acquisition [Line Items]
Percentage of membership interest acquired											100.00%
Sunoco LLC [Member]
Business Acquisition [Line Items]
Percentage of membership interest acquired					31.58%
Percentage of membership interest acquired					50.10%
Business acquisition total purchase price					$ 775
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares					795,482
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual								$ 2,400	$ 5,500
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual								$ 25	$ 73
Sunoco Retail L L C [Member]
Business Acquisition [Line Items]
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual										$ 1,500
Emerge Energy Services LP [Member]
Business Acquisition [Line Items]
Business acquisition total purchase price		$ 171
Number of transmix processing plants acquired | plant		2
Barrels per day able to be processed by transmix plants (over 10,000 barrels) | Boe		10,000
Barrels of storage capacity of transmix plants (over 800,000) | Boe		800,000
Denny Oil Company [Member]
Business Acquisition [Line Items]
Business acquisition total purchase price	$ 55
Number of fee properties | property	13
Number of company-operated locations | location	6
Number of Dealer-Operated Locations | location	6
Acquisition increased goodwill	$ 18
Kolkhorst Petroleum Inc. [Member]
Business Acquisition [Line Items]
Number of fee properties | property			5
Number of leased properties | property			9
Acquisition increased goodwill			$ 19
Kolkhorst Petroleum Inc. [Member] | Texas [Member]
Business Acquisition [Line Items]
Business acquisition total purchase price			$ 39
Number of stores | store			14
Valentine Stores, Inc. [Member]
Business Acquisition [Line Items]
Number of fee properties | property			19
Number of company-operated locations | store			18
Acquisition increased goodwill			$ 42
Number of tracts of land | tract			3
Valentine Stores, Inc. [Member] | Tim Hortons Restaurant [Member]
Business Acquisition [Line Items]
Number of leased properties | property			1
Number of restaurants acquired | restaurant			1
Valentine Stores, Inc. [Member] | New York [Member]
Business Acquisition [Line Items]
Business acquisition total purchase price			$ 78
Number of stores | store			18
E T P Dropdown [Member]
Business Acquisition [Line Items]
Percentage of membership interest acquired											68.42%
Acquisition of business				$ (2,200)
Sunmarks Limited Liability Company [Member]
Business Acquisition [Line Items]
Percentage of membership interest acquired											100.00%
6.375% Senior Notes Due 2023 [Member] | Senior Notes [Member]
Business Acquisition [Line Items]
Interest rate, stated percentage					6.375%	6.375%
6.375% Senior Notes Due 2023 [Member] | Sunoco LLC and Sunoco Retail LLC [Member] | Senior Notes [Member]
Business Acquisition [Line Items]
Interest rate, stated percentage					6.375%
Common Units [Member] | Sunoco LLC [Member]
Business Acquisition [Line Items]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares				5,710,922

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