XML 96 R79.htm IDEA: XBRL DOCUMENT v3.8.0.1
Segment Information - Reconciliation to Income from Operations (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items]    
Segment portion attributable to Predecessor $ 0 $ 36
Income from equity method investments [1] 61 5
Other income - related parties 23 22
Depreciation and amortization (176) (187)
General and administrative expenses (69) (58)
Income from operations 557 265
Operating Segments    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Segment operating income attributable to MPLX LP 774 465
Segment Reconciling Items    
Segment Reporting, Revenue Reconciling Item [Line Items]    
Segment portion attributable to unconsolidated affiliates (53) (40)
Segment portion attributable to Predecessor 0 53
Income from equity method investments 61 5
Other income - related parties 13 11
Unrealized derivative gains [2] $ 7 $ 16
[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