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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance $ 159,298 $ 154,562 $ 160,242 $ 139,940
Components of Other Comprehensive Income (Loss):        
Other Comprehensive Gain (Loss), Net of Tax 114 318 201 716
Ending balance 166,248 159,627 166,248 159,627
Related income taxes 2,183 3,571 6,926 10,636
Total        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance (2,711) (3,491) (2,798) (3,889)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     8 353
Reclassifications     193 363
Other Comprehensive Gain (Loss), Net of Tax 114 318 201 716
Ending balance (2,597) (3,173) (2,597) (3,173)
Currency Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (203) (162)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (21) (97)
Reclassifications     0 0
Other Comprehensive Gain (Loss), Net of Tax     (21) (97)
Ending balance (224) (259) (224) (259)
Unrealized Holding Gains (Losses) on Securities        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (12) (11)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (4) (3)
Reclassifications     0 0
Other Comprehensive Gain (Loss), Net of Tax     (4) (3)
Ending balance (16) (14) (16) (14)
Derivatives        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (12) 0
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     (18) 69
Reclassifications     17 (31)
Other Comprehensive Gain (Loss), Net of Tax     (1) 38
Ending balance (13) 38 (13) 38
Defined Benefit Plans        
Accumulated Other Comprehensive Income (Loss) [Roll Forward]        
Beginning balance     (2,571) (3,716)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications     51 384
Reclassifications     176 394
Other Comprehensive Gain (Loss), Net of Tax     227 778
Ending balance $ (2,344) $ (2,938) (2,344) $ (2,938)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income        
Components of Other Comprehensive Income (Loss):        
Employee Benefits for reclassified components     187  
Related income taxes     $ 11