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Mergers and Acquisitions - Sunoco LLC and Sunoco Retail LLC Acquisitions (Narrative) (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Aug. 21, 2015 | Jul. 01, 2015 | Apr. 01, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Jan. 01, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of membership interest acquired |  | 100.00% | 100.00% |  |  |  |  |  |
Equity units issued (in shares) |  |  |  |  |  | 5,710,922 |  |  |
Sunoco LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of membership interest acquired |  |  |  | 31.58% |  |  |  |  |
Percentage of membership interest acquired | 49.90% |  |  | 50.10% |  |  |  |  |
Consideration transferred |  |  |  | $ 775 |  |  |  |  |
Equity units issued (in shares) |  |  |  | 795,482 |  |  |  |  |
Pro forma revenues |  |  |  |  | $ 2,400 |  | $ 5,500 |  |
Pro forma net income (loss) |  |  |  |  | $ 25 |  | $ 73 |  |
Sunoco LLC [Member] | Common Units [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Equity units issued (in shares) | 5,710,922 |  |  |  |  |  |  |  |
Sunoco Retail LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of membership interest acquired | 100.00% |  |  |  |  |  |  |  | 100.00%
E T P Dropdown [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of membership interest acquired |  |  |  |  |  |  |  |  | 68.42%
Payments to acquire business | $ 2,200 |  |  |  |  |  |  |  |
Sunmarks Limited Liability Company [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of membership interest acquired |  |  |  |  |  |  |  |  | 100.00%
Sunoco Retail LLC [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Pro forma revenues |  |  |  |  |  | $ 1,500 |  |  |
Pro forma net income (loss) |  |  |  |  |  | $ 11 |  |  |
6.375% Senior Notes Due 2023 [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 6.375% |  |  |  | 6.375% |
6.375% Senior Notes Due 2023 [Member] | Senior Notes [Member] | Sunoco Limited Liability Company And Sunoco Retail Limited Liability Company [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 6.375% |  |  |  |  |

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