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Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Basic earnings per share:
Net income attributable to MPC	$ 1,095	$ 737	$ 2,194	$ 1,829
Income allocated to participating securities	0	0	1	1
Income available to common stockholders – basic	$ 1,095	$ 737	$ 2,193	$ 1,828
Weighted average common shares outstanding (in shares)	656	451	663	462
Basic earnings per share	$ 1.67	$ 1.63	$ 3.31	$ 3.96
Diluted earnings per share:
Net income attributable to MPC	$ 1,095	$ 737	$ 2,194	$ 1,829
Income allocated to participating securities	0	0	1	1
Income available to common stockholders – diluted	$ 1,095	$ 737	$ 2,193	$ 1,828
Weighted average common shares outstanding (in shares)	656	451	663	462
Effect of dilutive securities (in shares)	4	5	5	4
Weighted average common shares, including dilutive effect (in shares)	660	456	668	466
Diluted earnings per share	$ 1.66	$ 1.62	$ 3.28	$ 3.92

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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