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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, 2022
Dec. 31, 2021
Dec. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance $ 45,406 $ 29,849 $ 35,050
Ending Balance 48,003 45,406 29,849
Defined Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (31) (425) (350)
Other comprehensive income (loss) (417) 394 (75)
Ending Balance (448) (31) (425)
Net Unrealized Gain/(Loss) on Securities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance 0 2 0
Other comprehensive income (loss) (11) (2) 2
Ending Balance (11) 0 2
Foreign Currency Translation      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (4,919) (4,795) (5,007)
Other comprehensive income (loss) (622) (124) 212
Ending Balance (5,541) (4,919) (4,795)
Accumulated Other Comprehensive Loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (4,950) (5,218) (5,357)
Other comprehensive income (loss) (1,050) 268 139
Ending Balance $ (6,000) $ (4,950) $ (5,218)