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Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 1,834	$ 836	$ 434
Other comprehensive (loss)/income, net of tax:
Remeasurements of pension and other postretirement benefits related to equity method investments, net of tax	(2)	0	0
Comprehensive income	1,832	836	434
Less comprehensive income attributable to:
Noncontrolling interests	16	6	2
Income attributable to Predecessor	0	36	199
Comprehensive income attributable to MPLX LP	$ 1,816	$ 794	$ 233

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated other comprehensive income (loss) related to the net actuarial gain (loss) of pension and other postretirement defined benefit plans.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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