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Derivative Instruments - Summary of Cumulative Hedging Adjustments and the Carrying Amount of Assets and Liabilities Designated in Fair Value Hedges (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Available-for-Sale Securities [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Carrying Amount of the Hedged Assets $ 16,445 $ 99
Cumulative hedging adjustment included in the carrying amount of the hedged assets (26) (1)
Long-term Debt Securities [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Carrying amount of the hedged liabilities 12,278 8,567
Cumulative hedging adjustment included in the carrying amount of the hedged liabilities $ 585 $ 903