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Other Comprehensive Income Information (Schedule Of Accumulated Other Comprehensive Income Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Cumulative Foreign Exchange Translation Adjustment [Roll Forward]        
Current period change excluding amounts reclassified from accumulated other comprehensive income $ (461) $ 1,315 $ 2,047 $ (67)
Postretirement Benefits Reserves Adjustment [Roll Forward]        
Current period change excluding amounts reclassified from accumulated other comprehensive income, postretirement benefits reserves adjustment (1) (17) (47) (30)
Amounts reclassified from accumulated other comprehensive income 6 16 36 42
Accumulated Other Comprehensive Income [Roll Forward]        
Balance at beginning of period     (14,619)  
Balance at end of period (12,782)   (12,782)  
Exxon Mobil Corporation Share After Noncontrolling Interest        
Cumulative Foreign Exchange Translation Adjustment [Roll Forward]        
Beginning balance, cumulative foreign exchange translation adjustment     (16,166) (13,056)
Current period change excluding amounts reclassified from accumulated other comprehensive income     1,851 32
Amounts reclassified from accumulated other comprehensive income     0 0
Total change in accumulated other comprehensive income     1,851 32
Ending balance, cumulative foreign exchange translation adjustment (14,315) (13,024) (14,315) (13,024)
Net investment hedge gain/(loss), net of taxes     (300) 8
Postretirement Benefits Reserves Adjustment [Roll Forward]        
Beginning balance, postretirement benefits reserves adjustment     1,547 1,067
Current period change excluding amounts reclassified from accumulated other comprehensive income, postretirement benefits reserves adjustment     (49) (34)
Amounts reclassified from accumulated other comprehensive income     35 32
Total change in accumulated other comprehensive income     (14) (2)
Ending balance, postretirement benefits reserves adjustment 1,533 1,065 1,533 1,065
Accumulated Other Comprehensive Income [Roll Forward]        
Balance at beginning of period     (14,619) (11,989)
Current period change excluding amounts reclassified from accumulated other comprehensive income, Total     1,802 (2)
Amounts reclassified from accumulated other comprehensive income     35 32
Total change in accumulated other comprehensive income     1,837 30
Balance at end of period $ (12,782) $ (11,959) $ (12,782) $ (11,959)