Other Comprehensive Income Information (Schedule of Accumulated Other Comprehensive Income Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cumulative Translation Adjustment Summary [Roll Forward]
Current period change excluding amounts reclassified from accumulated other comprehensive income	$ (3,550)	$ 1,241	$ (3,482)
Amounts reclassified from accumulated other comprehensive income	0	609	0
Postretirement Benefits Reserves Adjustment [Roll Forward]
Current period change excluding amounts reclassified from accumulated other comprehensive income	557	(369)	3,395
Amounts reclassified from accumulated other comprehensive income	43	61	403
Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(11,989)
Balance at end of period	(14,619)	(11,989)
Exxon Mobil Corporation Share After Noncontrolling Interest [Member]
Cumulative Translation Adjustment Summary [Roll Forward]
Balance at beginning of period	(13,056)	(14,591)	(11,499)
Current period change excluding amounts reclassified from accumulated other comprehensive income	(3,110)	1,108	(3,092)
Amounts reclassified from accumulated other comprehensive income	0	427	0
Total change in accumulated other comprehensive income	(3,110)	1,535	(3,092)
Balance at end of period	(16,166)	(13,056)	(14,591)
Net investment hedge gain/(loss), net of taxes	196	(135)
Postretirement Benefits Reserves Adjustment [Roll Forward]
Balance at beginning of period	1,067	1,321	(2,265)
Current period change excluding amounts reclassified from accumulated other comprehensive income	449	(305)	3,205
Amounts reclassified from accumulated other comprehensive income	31	51	381
Total change in accumulated other comprehensive income	480	(254)	3,586
Balance at end of period	1,547	1,067	1,321
Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(11,989)	(13,270)	(13,764)
Current period change excluding amounts reclassified from accumulated other comprehensive income	(2,661)	803	113
Amounts reclassified from accumulated other comprehensive income	31	478	381
Total change in accumulated other comprehensive income	(2,630)	1,281	494
Balance at end of period	$ (14,619)	$ (11,989)	$ (13,270)