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Securities - Narrative (Detail) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]      
Securities available-for-sale, allowance for credit losses $ 0   $ 0
Securities held-to-maturity, allowance for credit losses 0   0
Securities held-to-maturity, past due 15,294,000,000   15,076,000,000
Securities held-to-maturity, nonaccrual 0   0
Debt Securities, Available-for-Sale, Realized Loss 0 $ 0  
Equity securities without readily determinable fair values, impairment loss adjustment 4,000,000 $ 4,000,000  
Past Due      
Debt Securities, Available-for-sale [Line Items]      
Securities held-to-maturity, past due 0   0
Other assets      
Debt Securities, Available-for-sale [Line Items]      
Federal Home Loan Bank stock 95,000,000   95,000,000
Federal Reserve Bank stock $ 438,000,000   $ 438,000,000