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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 153,157 $ 161,929
Components of Other Comprehensive Income (Loss):    
Other Comprehensive Gain (Loss), Net of Tax 51 (5)
Ending balance 150,080 161,656
Related income taxes 2,071 2,371
Total    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (2,760) (2,960)
Components of Other Comprehensive Income (Loss):    
Before Reclassifications 8 (37)
Reclassifications 43 32
Other Comprehensive Gain (Loss), Net of Tax 51 (5)
Ending balance (2,709) (2,965)
Currency Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (259) (192)
Components of Other Comprehensive Income (Loss):    
Before Reclassifications 16 (20)
Reclassifications 0 0
Other Comprehensive Gain (Loss), Net of Tax 16 (20)
Ending balance (243) (212)
Unrealized Holding Gains (Losses) on Securities    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (19) (11)
Components of Other Comprehensive Income (Loss):    
Before Reclassifications 5 (6)
Reclassifications 0 0
Other Comprehensive Gain (Loss), Net of Tax 5 (6)
Ending balance (14) (17)
Derivatives    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (14) 5
Components of Other Comprehensive Income (Loss):    
Before Reclassifications (21) (25)
Reclassifications 17 (7)
Other Comprehensive Gain (Loss), Net of Tax (4) (32)
Ending balance (18) (27)
Defined Benefit Plans    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (2,468) (2,762)
Components of Other Comprehensive Income (Loss):    
Before Reclassifications 8 14
Reclassifications 26 39
Other Comprehensive Gain (Loss), Net of Tax 34 53
Ending balance (2,434) $ (2,709)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income    
Components of Other Comprehensive Income (Loss):    
Employee Benefits for reclassified components 36  
Related income taxes $ 10