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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]      
Notional amounts of derivative contracts entered into for trading account purposes $ 23,350,000,000 $ 51,050,000,000  
Net unrealized pre-tax gains related to hedged loans held for sale, commitments to originate loans for sale and commitments to sell loans 24,000,000 64,000,000  
Unrealized gain recognized in other comprehensive income related to cash flow hedges 88,000,000    
Aggregate fair value of derivative financial instruments in a liability position 35,000,000 114,000,000  
Aggregate fair value of derivative financial instruments in asset position 7,000,000 3,000,000  
Collateral relating to net asset positions 6,000,000 3,000,000  
Counterparties [Member]      
Derivative [Line Items]      
Post collateral requirements relating to positions 33,000,000 103,000,000  
Clearinghouse Credit Facilities [Member]      
Derivative [Line Items]      
Amount of initial margin posted 132,000,000 135,000,000  
Interest Income [Member]      
Derivative [Line Items]      
Cash flow hedges drerivative instruments income 252,000,000 272,000,000  
Interest Rate Swap Agreements [Member]      
Derivative [Line Items]      
Increase decrease in net interest income due to interest rate swap agreements 287,000,000 312,000,000 $ (2,000,000)
Notional amounts of derivative contracts entered into for trading account purposes 23,350,000,000    
Interest Rate Swap Agreements [Member] | Maturity Period 2022 [Member]      
Derivative [Line Items]      
Unrealized gain recognized in other comprehensive income related to cash flow hedges 65,000,000    
Interest Rate Swap Agreements [Member] | Maturity Period 2023 [Member]      
Derivative [Line Items]      
Unrealized gain recognized in other comprehensive income related to cash flow hedges 23,000,000    
Interest Rate Contracts [Member]      
Derivative [Line Items]      
Notional amounts of derivative contracts entered into for trading account purposes 32,600,000,000 37,800,000,000  
Foreign Currency and Other Option and Futures Contracts [Member]      
Derivative [Line Items]      
Notional amounts of derivative contracts entered into for trading account purposes $ 1,100,000,000 $ 776,000,000