Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings per common share
Net income (loss) attributable to ExxonMobil	$ 33,680	$ 36,010	$ 55,740
Weighted average number of common shares outstanding (in shares)	4,298	4,052	4,205
Earnings (loss) per common share, basic (in dollars per share)	$ 7.84	$ 8.89	$ 13.26
Earnings (loss) per common share, diluted (in dollars per share)	7.84	8.89	13.26
Dividends paid per common share (in dollars per share)	$ 3.84	$ 3.68	$ 3.55