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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