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Acquisitions - Pro Forma Information - Andeavor (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Sales and other operating revenues	$ 31,043	$ 22,988	$ 92,857	$ 64,171
Net income attributable to MPC	$ 1,095	737	$ 2,194	1,829
Andeavor
Business Acquisition [Line Items]
Sales and other operating revenues		35,250		99,588
Net income attributable to MPC		$ 1,057		$ 2,562

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