Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share [Abstract]
Net income (loss) attributable to ExxonMobil	$ 7,713	$ 8,220
Weighted average number of common shares outstanding (in shares)	4,372	3,998
Earnings (loss) per common share, basic (in dollars per share)	$ 1.76	$ 2.06
Earnings (loss) per common share, diluted (in dollars per share)	1.76	2.06
Dividends paid per common share (in dollars per share)	$ 0.99	$ 0.95