Consolidated Statement Of Changes In Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock, without par value [Member]	ExxonMobil Share Of Earnings Reinvested [Member]	ExxonMobil Share Of Accumulated Other Comprehensive Income [Member]	Common Stock Held In Treasury [Member]	ExxonMobil Share of Equity [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2021	$ 175,683	$ 15,746	$ 392,059	$ (13,764)	$ (225,464)	$ 168,577	$ 7,106
Balance (in shares) - issued at Dec. 31, 2021	8,019
Balance (in shares) - in treasury at Dec. 31, 2021	(3,780)
Balance (in shares) - outstanding at Dec. 31, 2021	4,239
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of stock-based awards	$ 481	481				481
Other	(70)	(475)				(475)	405
Net income (loss) for the year	57,577		55,740			55,740	1,837
Dividends - common shares (company)			(14,939)			(14,939)
Dividends - common shares (NCI)							(267)
Dividends - common shares (total)	(15,206)
Other comprehensive income	316			494		494	(178)
Share repurchases, at cost (company)					(15,295)	(15,295)
Share repurchase, at cost, noncontrolling interest							(1,479)
Share repurchase, at cost, including noncontrolling interest	$ (16,774)
Share repurchases, at cost (in shares)	(165)
Dispositions	$ 466				466	466
Dispositions (in shares)	8
Balance at Dec. 31, 2022	$ 202,473	15,752	432,860	(13,270)	(240,293)	195,049	7,424
Balance (in shares) - issued at Dec. 31, 2022	8,019
Balance (in shares) - in treasury at Dec. 31, 2022	(3,937)
Balance (in shares) - outstanding at Dec. 31, 2022	4,082
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of stock-based awards	$ 565	565				565
Other	(427)	(514)	(2)			(516)	89
Net income (loss) for the year	37,354		36,010			36,010	1,344
Dividends - common shares (company)			(14,941)			(14,941)
Dividends - common shares (NCI)							(531)
Dividends - common shares (total)	(15,472)
Other comprehensive income	1,542			1,281		1,281	261
Share repurchases, at cost (company)					(17,993)	(17,993)
Share repurchase, at cost, noncontrolling interest							(851)
Share repurchase, at cost, including noncontrolling interest	$ (18,844)
Share repurchases, at cost (in shares)	(165)
Issued for acquisitions	$ 4,844	1,978			2,866	4,844
Issued for acquisitions (in shares)	46
Dispositions	$ 503				503	503
Dispositions (in shares)	8
Balance at Dec. 31, 2023	$ 212,538	17,781	453,927	(11,989)	(254,917)	204,802	7,736
Balance (in shares) - issued at Dec. 31, 2023	8,019
Balance (in shares) - in treasury at Dec. 31, 2023	(4,048)
Balance (in shares) - outstanding at Dec. 31, 2023	3,971
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amortization of stock-based awards	$ 735	735				735
Other	(1,651)	(1,027)				(1,027)	(624)
Net income (loss) for the year	35,063		33,680			33,680	1,383
Dividends - common shares (company)			(16,704)			(16,704)
Dividends - common shares (NCI)							(658)
Dividends - common shares (total)	(17,362)
Other comprehensive income	(2,950)			(2,630)		(2,630)	(320)
Share repurchases, at cost (company)					(19,451)	(19,451)
Share repurchase, at cost, noncontrolling interest							(616)
Share repurchase, at cost, including noncontrolling interest	$ (20,067)
Share repurchases, at cost (in shares)	(170)
Issued for acquisitions	$ 63,352	28,749			34,603	63,352
Issued for acquisitions (in shares)	545
Dispositions	$ 948				948	948
Dispositions (in shares)	7
Balance at Dec. 31, 2024	$ 270,606	$ 46,238	$ 470,903	$ (14,619)	$ (238,817)	$ 263,705	$ 6,901
Balance (in shares) - issued at Dec. 31, 2024	8,019
Balance (in shares) - in treasury at Dec. 31, 2024	(3,666)
Balance (in shares) - outstanding at Dec. 31, 2024	4,353