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Derivative Instruments - Summary of Cumulative Hedging Adjustments and the Carrying Amount of Assets and Liabilities Designated in Fair Value Hedges (Parenthetical) (Detail) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Available-for-Sale Securities [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Cumulative hedging adjustment asset related to discontinued hedging relationships $ (362) $ (392)
Amortized cost of the closed portfolios 5,800  
Amortized cost of the closed portfolios designated as hedged 5,100  
Increase (decrease) in cumulative amount of basis adjustments (95)  
Long-term Debt Securities [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Cumulative hedging adjustment asset related to discontinued hedging relationships $ (18) $ 399