Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income (loss)	$ 16,050	$ 11,001	$ (9,977)
Other comprehensive income (loss)	69	445	(192)
Comprehensive income (loss)	16,119	11,446	(10,169)
Less comprehensive income (loss) attributable to:
Redeemable noncontrolling interest	88	100	81
Noncontrolling interests	1,446	1,163	(232)
Comprehensive income (loss) attributable to MPC	14,585	10,183	(10,018)
Actuarial changes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	122	276	(157)
Prior service
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	(52)	175	(34)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ (1)	$ (6)	$ (1)