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Derivatives and Hedging Activities - Summary of Derivatives Bifurcated from their Related Borrowings (Detail) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Derivative [Line Items]    
Fair value of assets $ 283 $ 845
Fair value of liabilities (263) (124)
Net asset/(liability) 20 721
Notional amount 42,068,858 42,639,542
Embedded Derivatives Classified In Debt    
Derivative [Line Items]    
Notional amount $ 8,856 $ 10,743