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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 132,726 $ 145,208
Components of Other Comprehensive Income (Loss):    
Before Reclassifications 693 (20)
Reclassifications 333 126
Other Comprehensive Gain (Loss), Net of Tax 1,026 106
Ending balance 132,933 144,914
Related income taxes 779 564
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (5,612) (4,990)
Components of Other Comprehensive Income (Loss):    
Other Comprehensive Gain (Loss), Net of Tax 1,026 106
Ending balance (4,586) (4,884)
Currency Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (107) (142)
Components of Other Comprehensive Income (Loss):    
Before Reclassifications (19) (19)
Reclassifications 0 0
Other Comprehensive Gain (Loss), Net of Tax (19) (19)
Ending balance (126) (161)
Unrealized Holding Gains (Losses) on Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (10) (8)
Components of Other Comprehensive Income (Loss):    
Before Reclassifications (3) (3)
Reclassifications 0 0
Other Comprehensive Gain (Loss), Net of Tax (3) (3)
Ending balance (13) (11)
Defined Benefit Plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (5,495) (4,840)
Components of Other Comprehensive Income (Loss):    
Before Reclassifications 715 2
Reclassifications 333 126
Other Comprehensive Gain (Loss), Net of Tax 1,048 128
Ending balance (4,447) $ (4,712)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income    
Components of Other Comprehensive Income (Loss):    
Employee Benefits for reclassified components 431  
Related income taxes $ 98