v3.26.1
Other Comprehensive Income Information (Schedule of Accumulated Other Comprehensive Income Information) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Cumulative Foreign Exchange Translation Adjustment [Roll Forward]    
Current period change excluding amounts reclassified from accumulated other comprehensive income $ (263) $ 302
Amounts reclassified from accumulated other comprehensive income (5) 0
Postretirement Benefits Reserves Adjustment [Roll Forward]    
Current period change excluding amounts reclassified from accumulated other comprehensive income (35) (34)
Amounts reclassified from accumulated other comprehensive income (27) 23
Accumulated Other Comprehensive Income [Roll Forward]    
Balance at beginning of period (10,863)  
Balance at end of period (11,098)  
Exxon Mobil Corporation Share After Noncontrolling Interest    
Cumulative Foreign Exchange Translation Adjustment [Roll Forward]    
Beginning balance, cumulative foreign exchange translation adjustment (13,398) (16,166)
Current period change excluding amounts reclassified from accumulated other comprehensive income (174) 295
Amounts reclassified from accumulated other comprehensive income (5) 0
Total change in accumulated other comprehensive income (179) 295
Ending balance, cumulative foreign exchange translation adjustment (13,577) (15,871)
Net investment hedge gain/(loss), net of taxes 55 (99)
Postretirement Benefits Reserves Adjustment [Roll Forward]    
Beginning balance, postretirement benefits reserves adjustment 2,535 1,547
Current period change excluding amounts reclassified from accumulated other comprehensive income (29) (36)
Amounts reclassified from accumulated other comprehensive income (27) 22
Total change in accumulated other comprehensive income (56) (14)
Ending balance, postretirement benefits reserves adjustment 2,479 1,533
Accumulated Other Comprehensive Income [Roll Forward]    
Balance at beginning of period (10,863) (14,619)
Current period change excluding amounts reclassified from accumulated other comprehensive income, Total (203) 259
Amounts reclassified from accumulated other comprehensive income (32) 22
Total change in accumulated other comprehensive income (235) 281
Balance at end of period $ (11,098) $ (14,338)