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Investment Securities - Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Transfer of amortized cost of available for sale debt securities to held to maturity securities $ 45,100  
Transfer of available for sale debt securities to held to maturity securities 40,700  
Debt securities, Held to maturity, Allowance for credit loss 0  
Asset Pledged as Collateral [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair value of securities pledged 14,300 $ 30,700
Asset Pledged as Collateral with Right [Member]    
Debt Securities, Available-for-sale [Line Items]    
Fair value of securities pledged $ 858 $ 557