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Derivatives and Hedging Activities - Derivatives with Credit-Related Contingent Features (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivative [Line Items]    
Net derivative liabilities under bilateral agreements $ 30,999 $ 31,575
Collateral posted 22,521 20,262
One-notch downgrade    
Derivative [Line Items]    
Additional collateral or termination payments: 186 315
Two-notch downgrade    
Derivative [Line Items]    
Additional collateral or termination payments: $ 1,427 $ 1,200