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Derivatives and Hedging Activities - Gain (Loss) from Interest Rate Hedges and Related Hedged Items (Detail) - Fair Value Hedging - Accounted for as hedges - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Derivative [Line Items]        
Gains/(losses) on Investments $ 8 $ 0 $ 33 $ 2
Net gain (loss) on fair value hedges (90) (81) (237) (267)
Interest rates        
Derivative [Line Items]        
Gains/(losses) on Investments 1 (744) (605) (540)
Change in unrealized gain (loss) on fair value hedges 390 4,867 3,488 2,941
Hedged investments        
Derivative [Line Items]        
Gains/(losses) on Investments 7 744 638 542
Hedged borrowings and deposits        
Derivative [Line Items]        
Gain (loss) on hedged item $ (480) $ (4,948) $ (3,725) $ (3,208)