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Derivatives and Hedging Activities - Carrying Amount of Hedged Items Currently Designated in a Hedging Relationship and Related Cumulative Hedging Adjustment (Detail) - Accounted for as hedges - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Investments    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Carrying Value $ 53,197 $ 34,755
Cumulative Hedging Adjustment, Assets 423 (279)
Deposits    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Carrying Value 1,106 1,840
Cumulative Hedging Adjustment, Liabilities (23) (52)
Unsecured short-term borrowings    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Carrying Value 8,889 14,720
Cumulative Hedging Adjustment, Liabilities (59) (113)
Unsecured long-term borrowings    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Carrying Value 138,216 130,161
Cumulative Hedging Adjustment, Liabilities $ (7,206) $ (10,757)