Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income	$ 5,067	$ 11,172	$ 16,050
Other comprehensive income (loss)	17	(133)	69
Comprehensive income	5,084	11,039	16,119
Less comprehensive income attributable to:
Redeemable noncontrolling interest	27	94	88
Noncontrolling interests	1,595	1,397	1,446
Comprehensive income attributable to MPC	3,462	9,548	14,585
Actuarial changes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	60	(85)	122
Prior service
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	(41)	(49)	(52)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ (2)	$ 1	$ (1)