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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