Consolidated Statements of Equity and Redeemable Noncontrolling Interest (Consolidated Statements of Equity) - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Beginning balance at Dec. 31, 2021	$ 32,616	$ 10	$ (19,904)	$ 33,262	$ 12,905	$ (67)	$ 6,410
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,151				845		306
Dividends declared on common stock	(330)				(330)
Distributions to noncontrolling interests	(290)						(290)
Other comprehensive income (loss)	(7)					(7)
Shares repurchased	(2,807)		(2,807)
Shares returned - stock based compensation			0
Shares issued - stock based compensation				90
Net shares issued - stock based compensation	89						(1)
Equity transactions of MPLX	(88)			(25)			(63)
Ending balance at Mar. 31, 2022	30,334	10	(22,711)	33,327	13,420	(74)	6,362
Beginning balance at Dec. 31, 2022	34,119	10	(31,841)	33,402	26,142	2	6,404
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,061				2,724		337
Dividends declared on common stock	(336)				(336)
Distributions to noncontrolling interests	(306)						(306)
Other comprehensive income (loss)	(11)					(11)
Shares repurchased	(3,238)		(3,238)
Shares returned - stock based compensation			0
Shares issued - stock based compensation				3
Net shares issued - stock based compensation	3						0
Equity transactions of MPLX	(597)			3	(2)		(598)
Ending balance at Mar. 31, 2023	$ 32,695	$ 10	$ (35,079)	$ 33,408	$ 28,528	$ (9)	$ 5,837