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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 147,100 $ 132,933 $ 139,940 $ 132,726
Components of Other Comprehensive Income (Loss):        
Other Comprehensive Gain (Loss), Net of Tax 161 291 398 1,317
Ending balance 154,562 133,911 154,562 133,911
Related income taxes 4,288 1,328 7,065 2,107
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (3,652) (4,586) (3,889) (5,612)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     207 804
Reclassifications     191 513
Other Comprehensive Gain (Loss), Net of Tax 161 291 398 1,317
Ending balance (3,491) (4,295) (3,491) (4,295)
Currency Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (162) (107)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (48) (16)
Reclassifications     0 0
Other Comprehensive Gain (Loss), Net of Tax     (48) (16)
Ending balance (210) (123) (210) (123)
Unrealized Holding Gains (Losses) on Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (11) (10)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     0 2
Reclassifications     0 0
Other Comprehensive Gain (Loss), Net of Tax     0 2
Ending balance (11) (8) (11) (8)
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     0 0
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     24 (2)
Reclassifications     (2) 0
Other Comprehensive Gain (Loss), Net of Tax     22 (2)
Ending balance 22 (2) 22 (2)
Defined Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (3,716) (5,495)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     231 820
Reclassifications     193 513
Other Comprehensive Gain (Loss), Net of Tax     424 1,333
Ending balance $ (3,292) $ (4,162) (3,292) $ (4,162)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income        
Components of Other Comprehensive Income (Loss):        
Employee Benefits for reclassified components     227  
Related income taxes     $ 34