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Accumulated Other Comprehensive Income (Loss) - Schedule of Components of Accumulated Other Comprehensive Loss in the Equity Section of the Balance Sheet (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ 64,796 $ 49,279
Other comprehensive income (loss) 79 (244)
Ending Balance 65,238 49,325
Defined Benefit Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (390)  
Other comprehensive income (loss) 7  
Ending Balance (383)  
Unrealized Holding Gain/(Loss) on Securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 3  
Other comprehensive income (loss) 2  
Ending Balance 5  
Foreign Currency Translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (6,104)  
Other comprehensive income (loss) 70  
Ending Balance (6,034)  
Unrealized Gain/(Loss) on Hedging Activities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance 18  
Other comprehensive income (loss) 0  
Ending Balance 18  
Accum. Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (6,473) (5,673)
Other comprehensive income (loss) 79 (244)
Ending Balance $ (6,394) $ (5,917)