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Segment Information - Reconciliation to Total Revenues and Other Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Total revenues and other income |  | $ 1,420 | $ 886
Income from equity method investments | [1] | 61 | 5
Other income - related parties |  | 23 | 22
Operating Segments |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Total revenues and other income |  | 1,482 | 955
Segment Reconciling Items |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Revenue adjustment from unconsolidated affiliates |  | (137) | (92)
Income from equity method investments |  | 61 | 5
Other income - related parties |  | 13 | 11
Unrealized derivative gains related to product sales(1) | [2] | $ 1 | $ 7
[1] | “Income (loss) from equity method investments” includes the impact of any basis differential amortization or accretion.
[2] | 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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