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Shareholders' Equity - Accumulated Other Comprehensive Income/(Loss), Net of Tax (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     $ 121,996  
Other comprehensive income/(loss) adjustments, net of tax $ (491) $ 397 226 $ 415
Ending balance 124,402 121,200 124,402 121,200
Currency translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (885) (825) (815) (847)
Other comprehensive income/(loss) adjustments, net of tax 23 (25) (47) (3)
Ending balance (862) (850) (862) (850)
Debt valuation adjustment        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (316) (411) (386) (123)
Other comprehensive income/(loss) adjustments, net of tax (711) (95) (641) (383)
Ending balance (1,027) (506) (1,027) (506)
Pension and postretirement liabilities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (505) (553) (528) (575)
Other comprehensive income/(loss) adjustments, net of tax 11 13 34 35
Ending balance (494) (540) (494) (540)
Available-for-sale securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (279) (1,111) (972) (1,373)
Other comprehensive income/(loss) adjustments, net of tax 185 504 878 766
Ending balance (94) (607) (94) (607)
Accumulated other comprehensive income/(loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,985) (2,900) (2,702) (2,918)
Other comprehensive income/(loss) adjustments, net of tax (491) 397 226 415
Ending balance (2,476) $ (2,503) (2,476) $ (2,503)
Cash flow hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 0   (1)  
Other comprehensive income/(loss) adjustments, net of tax 1   2  
Ending balance $ 1   $ 1