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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 132,933 $ 144,914 $ 132,726 $ 145,208
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     804 (7)
Reclassifications     513 247
Other Comprehensive Gain (Loss), Net of Tax 291 134 1,317 240
Ending balance 133,911 134,386 133,911 134,386
Related income taxes 1,328 (2,320) 2,107 (1,756)
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (4,586) (4,884) (5,612) (4,990)
Components of Other Comprehensive Income (Loss):        
Other Comprehensive Gain (Loss), Net of Tax 291 134 1,317 240
Ending balance (4,295) (4,750) (4,295) (4,750)
Currency Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (107) (142)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (16) (12)
Reclassifications     0 0
Other Comprehensive Gain (Loss), Net of Tax     (16) (12)
Ending balance (123) (154) (123) (154)
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     2 (4)
Reclassifications     0 0
Other Comprehensive Gain (Loss), Net of Tax     2 (4)
Ending balance (8) (12) (8) (12)
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     0 0
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (2) 0
Reclassifications     0 0
Other Comprehensive Gain (Loss), Net of Tax     (2) 0
Ending balance (2) 0 (2) 0
Defined Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (5,495) (4,840)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     820 9
Reclassifications     513 247
Other Comprehensive Gain (Loss), Net of Tax     1,333 256
Ending balance $ (4,162) $ (4,584) (4,162) $ (4,584)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income        
Components of Other Comprehensive Income (Loss):        
Employee Benefits for reclassified components     669  
Related income taxes     $ 156