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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 101	$ (78)
Defined benefit postretirement and post-employment plans:
Actuarial changes, net of tax of $3 and $5	4	8
Prior service costs, net of tax of ($4) and ($5)	(7)	(8)
Other comprehensive income (loss)	(3)	0
Comprehensive income (loss)	98	(78)
Less comprehensive income (loss) attributable to:
Redeemable noncontrolling interest	16	0
Noncontrolling interests	55	(79)
Comprehensive income attributable to MPC	$ 27	$ 1

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