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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 133,911 $ 134,386 $ 132,726 $ 145,208
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     526 9
Reclassifications     668 474
Other Comprehensive Gain (Loss), Net of Tax (123) 243 1,194 483
Ending balance 136,722 132,038 136,722 132,038
Related income taxes 1,940 165 4,047 (1,591)
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (4,295) (4,750) (5,612) (4,990)
Components of Other Comprehensive Income (Loss):        
Other Comprehensive Gain (Loss), Net of Tax (123) 243 1,194 483
Ending balance (4,418) (4,507) (4,418) (4,507)
Currency Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (107) (142)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (31) 5
Reclassifications     0 0
Other Comprehensive Gain (Loss), Net of Tax     (31) 5
Ending balance (138) (137) (138) (137)
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     (1) (5)
Reclassifications     0 0
Other Comprehensive Gain (Loss), Net of Tax     (1) (5)
Ending balance (11) (13) (11) (13)
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     0 0
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (5) 0
Reclassifications     2 0
Other Comprehensive Gain (Loss), Net of Tax     (3) 0
Ending balance (3) 0 (3) 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     563 9
Reclassifications     666 474
Other Comprehensive Gain (Loss), Net of Tax     1,229 483
Ending balance $ (4,266) $ (4,357) (4,266) $ (4,357)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income        
Components of Other Comprehensive Income (Loss):        
Employee Benefits for reclassified components     853  
Related income taxes     $ 187