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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 1,367	$ 941	$ 2,993	$ 2,411
Defined benefit plans:
Actuarial changes, net of tax of ($14), $24, ($8) and $29, respectively	(42)	75	(46)	89
Prior service credit, net of tax of ($3), ($3), ($14) and ($7), respectively	(8)	(7)	(19)	(21)
Other, net of tax of $0, ($1), ($1) and ($2), respectively	(1)	(3)	(3)	(5)
Other comprehensive income (loss)	(51)	65	(68)	63
Comprehensive income	1,316	1,006	2,925	2,474
Less comprehensive income attributable to:
Redeemable noncontrolling interest	20	19	61	55
Noncontrolling interests	252	185	738	527
Comprehensive income attributable to MPC	$ 1,044	$ 802	$ 2,126	$ 1,892

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