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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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Comprehensive Income (Loss), Net of Tax, Attributable to Nonredeemable Noncontrolling Interest

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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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. Excludes changes in equity resulting from investments by owners and distributions to owners.

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