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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 423 | $ 187
Other comprehensive income (loss), net of tax: |  |
Remeasurements of pension and other postretirement benefits related to equity method investments, net of tax | (2) | 0
Comprehensive income | 421 | 187
Less comprehensive income (loss) attributable to: |  |
Noncontrolling interests | 2 | 1
Income attributable to Predecessor | 0 | 36
Comprehensive income attributable to MPLX LP | $ 419 | $ 150

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