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Segment Information - Reconciliation to Total Revenues and Other Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Total revenues and other income |  | $ 916 | $ 698 | [1] | $ 1,802 |  | $ 1,343 | [1]
Income (loss) from equity method investments |  | 1 | (83) |  | 6 | [2] | (78) | [2]
Other income - related parties |  | 25 | 24 |  | 47 |  | 45 |
Operating Segments [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Total revenues and other income |  | 987 | 875 |  | 1,942 |  | 1,620 |
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Revenue adjustment from unconsolidated affiliates |  | (88) | (99) |  | (180) |  | (203) |
Other income - related parties |  | 14 | 11 |  | 25 |  | 18 |
Unrealized derivative gains (losses) related to product sales(1) | [3] | $ 2 | $ (6) |  | $ 9 |  | $ (14) |
[1] | Financial information has been retrospectively adjusted for the acquisition of HST, WHC and MPLXT from MPC. See Notes 1 and 3.
[2] | Income (loss) from equity method investments includes the impact of any basis differential amortization or accretion.
[3] | The Partnership makes a distinction between realized or unrealized gains and losses on derivatives. During the period when a derivative contract is outstanding, changes in the fair value of the derivative are recorded as an unrealized gain or loss. When a derivative contract matures or is settled, the previously recorded unrealized gain or loss is reversed and the realized gain or loss of the contract is recorded

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