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Securities - Narrative (Detail) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
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 17,798,000,000 15,076,000,000  
Debt securities, available-for-sale, realized loss 153,000,000 246,000,000 $ 6,000,000
Securities held-to-maturity, nonaccrual 0 0  
Equity securities without readily determinable fair values, impairment loss adjustment 4,000,000 5,000,000 $ 3,000,000
U.S. Government sponsored mortgage-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Debt securities, available-for-sale, sold 2,130,000,000    
Debt securities, available-for-sale, realized loss 148,000,000    
US Government-sponsored and US Government agency mortgage-backed securities      
Debt Securities, Available-for-sale [Line Items]      
Debt securities, available-for-sale, sold   960,000,000  
Debt securities, available-for-sale, realized loss   (246,000,000)  
Total Past Due 30 Days or More      
Debt Securities, Available-for-sale [Line Items]      
Securities held-to-maturity 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