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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]      
Notional amounts of derivative contracts entered into for trading account purposes $ 51,050,000,000 $ 57,550,000,000  
Net unrealized pre-tax gains related to hedged loans held for sale, commitments to originate loans for sale and commitments to sell loans 64,000,000 18,000,000  
Unrealized gain recognized in other comprehensive income related to cash flow hedges 373,000,000    
Aggregate fair value of derivative financial instruments in a liability position 114,000,000 51,000,000  
Aggregate fair value of derivative financial instruments in asset position 3,000,000 6,000,000  
Collateral relating to net asset positions 3,000,000 5,000,000  
Counterparties [Member]      
Derivative [Line Items]      
Post collateral requirements relating to positions 103,000,000 50,000,000  
Clearinghouse Credit Facilities [Member]      
Derivative [Line Items]      
Amount of initial margin posted 135,000,000 84,000,000  
Interest Income [Member]      
Derivative [Line Items]      
Cash flow hedges drerivative instruments income 272,000,000 13,000,000  
Interest Rate Swap Agreements [Member]      
Derivative [Line Items]      
Increase decrease in net interest income due to interest rate swap agreements 312,000,000 (2,000,000) $ (25,000,000)
Notional amounts of derivative contracts entered into for trading account purposes 51,050,000,000    
Interest Rate Swap Agreements [Member] | Maturity Period 2021 [Member]      
Derivative [Line Items]      
Unrealized gain recognized in other comprehensive income related to cash flow hedges 156,000,000    
Interest Rate Swap Agreements [Member] | Maturity Period 2022 [Member]      
Derivative [Line Items]      
Unrealized gain recognized in other comprehensive income related to cash flow hedges 170,000,000    
Interest Rate Swap Agreements [Member] | Maturity Period 2023 [Member]      
Derivative [Line Items]      
Unrealized gain recognized in other comprehensive income related to cash flow hedges 47,000,000    
Interest Rate Contracts [Member]      
Derivative [Line Items]      
Notional amounts of derivative contracts entered into for trading account purposes 37,800,000,000 48,600,000,000  
Foreign Currency and Other Option and Futures Contracts [Member]      
Derivative [Line Items]      
Notional amounts of derivative contracts entered into for trading account purposes $ 776,000,000 $ 1,200,000,000