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Accumulated Other Comprehensive (Loss) - Components of Accumulated Other Comprehensive Loss in the Equity Section of the Balance Sheet (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 48,003 $ 45,406 $ 29,849
Other comprehensive income (loss) 327 (1,050) 268
Ending balance 49,279 48,003 45,406
Accumulated Other Comprehensive Income/(Loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (6,000) (4,950) (5,218)
Other comprehensive income (loss) 327 (1,050) 268
Ending balance (5,673) (6,000) (4,950)
Defined Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (448) (31) (425)
Other comprehensive income (loss) 55 (417) 394
Ending balance (393) (448) (31)
Net Unrealized Holding Gain/(Loss) on Securities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (11) 0 2
Other comprehensive income (loss) 13 (11) (2)
Ending balance 2 (11) 0
Foreign Currency Translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (5,541) (4,919) (4,795)
Other comprehensive income (loss) 197 (622) (124)
Ending balance (5,344) (5,541) (4,919)
Unrealized Gain/(Loss) on Hedging Activities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 0 0 0
Other comprehensive income (loss) 62 0 0
Ending balance $ 62 $ 0 $ 0