v3.25.4
Shareholders' Equity - Accumulated Other Comprehensive Income/(Loss), Net of Tax (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 121,996 $ 116,905  
Other comprehensive income/(loss) adjustments, net of tax 442 216 $ 92
Ending balance 124,972 121,996 116,905
Currency translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (815) (847) (785)
Other comprehensive income/(loss) adjustments, net of tax 11 32 (62)
Ending balance (804) (815) (847)
Debt valuation adjustment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (386) (123) 892
Other comprehensive income/(loss) adjustments, net of tax (676) (263) (1,015)
Ending balance (1,062) (386) (123)
Pension and postretirement liabilities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (528) (575) (499)
Other comprehensive income/(loss) adjustments, net of tax 32 47 (76)
Ending balance (496) (528) (575)
Available-for-sale securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (972) (1,373) (2,618)
Other comprehensive income/(loss) adjustments, net of tax 1,075 401 1,245
Ending balance 103 (972) (1,373)
Accumulated other comprehensive income/(loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (2,702) (2,918) (3,010)
Other comprehensive income/(loss) adjustments, net of tax 442 216 92
Ending balance (2,260) (2,702) (2,918)
Cash flow hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1) 0  
Other comprehensive income/(loss) adjustments, net of tax 0 (1)  
Ending balance $ (1) $ (1) $ 0