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Mergers and Acquisitions - Susser Acquisition (Narrative) (Details) $ in Millions |  |  | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 19, 2015 | Jul. 31, 2015 USD ($) shares | Jul. 31, 2015 USD ($) | Dec. 31, 2016 shares | Dec. 31, 2015 USD ($) | Jul. 30, 2015 shares
Business Acquisition [Line Items] |  |  |  |  |  |
Equity units issued (in shares) |  |  |  | 5,710,922 |  |
Susser [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of membership interest acquired |  | 100.00% | 100.00% |  |  |
Payments to acquire business | $ |  | $ 967 |  |  |  |
Pro forma revenues | $ |  |  | $ 2,600 |  | $ 742 |
Pro forma net income (loss) | $ |  |  | $ 18 |  | $ (15) |
Class B Units [Member] | Susser [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity units issued (in shares) |  | 21,978,980 |  |  |  |
Conversion ratio | 1 |  |  |  |  |
Common Units [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Partners' capital account, converted units (in shares) |  | 79,308 |  |  |  |
Common Units [Member] | Susser [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Partners' capital account, converted units (in shares) |  | 79,308 |  |  |  |
Limited partner interest, units issued (in shares) |  |  |  |  |  | 79,308
Common Units [Member] | Class A Units [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Partners' capital account, converted units (in shares) |  | 79,308 |  |  |  |
Common Units [Member] | Class A Units [Member] | Susser [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Partners' capital account, units issued upon acquisition (in shares) |  | 79,308 |  |  |  |
Subordinated Units [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Partners' capital account, converted units (in shares) |  | 10,939,436 |  |  |  |
Subordinated Units [Member] | Susser [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Partners' capital account, converted units (in shares) |  | 10,939,436 |  |  |  |
Limited partner interest, units issued (in shares) |  |  |  |  |  | 10,939,436
Subordinated Units [Member] | Class A Units [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Partners' capital account, converted units (in shares) |  | 10,939,436 |  |  |  |
Subordinated Units [Member] | Class A Units [Member] | Susser [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Partners' capital account, units issued upon acquisition (in shares) |  | 10,939,436 |  |  |  |

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