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Segment Information - Reconciliation to Income from Operations (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]        
Segment portion attributable to Predecessor $ 0 $ 52 $ 36 $ 98
Income (loss) from equity method investments 1 (83) 6 [1] (78) [1]
Other income - related parties 25 24 47 45
Depreciation and amortization (164) (151) (351) (287)
Impairment expense 0 (1) 0 (130)
General and administrative expenses (57) (63) (115) (116)
Income from operations 280 128 [2] 545 178 [2]
Operating Segments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Segment operating income attributable to MPLX LP 521 394 986 739
Segment Reconciling Items [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Segment portion attributable to unconsolidated affiliates (38) (47) (78) (89)
Segment portion attributable to Predecessor 0 80 53 142
Other income - related parties 14 11 25 18
Unrealized derivative gains (losses)(1) [3] 3 (12) 19 (21)
L&S [Member] | Operating Segments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Segment operating income attributable to MPLX LP 208 123 364 211
G&P [Member] | Operating Segments [Member]        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Segment operating income attributable to MPLX LP $ 313 $ 271 $ 622 $ 528
[1] Income (loss) from equity method investments includes the impact of any basis differential amortization or accretion.
[2] Financial information has been retrospectively adjusted for the acquisition of HST, WHC and MPLXT from MPC. See Notes 1 and 3.
[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