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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
Jun. 30, 2022
Dec. 31, 2021
Long-term Debt Securities [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Cumulative hedging adjustment related to discontinued hedging relationships $ 468 $ 640
Available-for-Sale Securities [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Cumulative hedging adjustment asset related to discontinued hedging relationships $ (365) $ (6)