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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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