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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease [Abstract]        
Current period change excluding amounts reclassified from accumulated other comprehensive income, Cumulative Foreign Exchange Translation Adjustment $ 2,342 $ (107) $ 5,424 $ 2,506
Amounts reclassified from accumulated other comprehensive income, Cumulative Foreign Exchange Translation Adjustment     234  
Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Abstract]        
Current period change excluding amounts reclassified from accumulated other comprehensive income, Postretirement Benefits Reserves Adjustment (145) 34 (329) 25
Amounts reclassified from accumulated other comprehensive income, Postretirement Benefits Reserves Adjustment 311 278 850 859
Other Comprehensive Income Loss Net Of Tax Period Change [Abstract]        
Beginning Balance, Total     (22,239)  
Ending Balance, Total (16,651)   (16,651)  
Exxon Mobil Corporation Share After Noncontrolling Interest [Member]        
Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Period Increase Decrease [Abstract]        
Beginning Balance, Cumulative Foreign Exchange Translation Adjustment     (14,501) (14,170)
Current period change excluding amounts reclassified from accumulated other comprehensive income, Cumulative Foreign Exchange Translation Adjustment     4,925 2,189
Amounts reclassified from accumulated other comprehensive income, Cumulative Foreign Exchange Translation Adjustment     140  
Total change in accumulated other comprehensive income, Cumulative Foreign Exchange Translation Adjustment     5,065 2,189
Ending Balance, Cumulative Foreign Exchange Translation Adjustment (9,436) (11,981) (9,436) (11,981)
Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Period Increase Decrease [Abstract]        
Beginning Balance, Postretirement Benefits Reserves Adjustment     (7,738) (9,341)
Current period change excluding amounts reclassified from accumulated other comprehensive income, Postretirement Benefits Reserves Adjustment     (300) 23
Amounts reclassified from accumulated other comprehensive income, Postretirement Benefits Reserves Adjustment     823 833
Total change in accumulated other comprehensive income, Postretirement Benefits Reserves Adjustment     523 856
Ending Balance, Postretirement Benefits Reserves Adjustment (7,215) (8,485) (7,215) (8,485)
Other Comprehensive Income Loss Net Of Tax Period Change [Abstract]        
Beginning Balance, Total     (22,239) (23,511)
Current period change excluding amounts reclassified from accumulated other comprehensive income, Total     4,625 2,212
Amounts reclassified from accumulated other comprehensive income, Total     963 833
Total change in accumulated other comprehensive income, Total     5,588 3,045
Ending Balance, Total $ (16,651) $ (20,466) $ (16,651) $ (20,466)