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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Derivative [Line Items]          
Notional amounts of derivative contracts entered into for trading account purposes $ 27,350,000,000   $ 27,350,000,000   $ 51,050,000,000
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)     167,000,000    
Net unrealized pre-tax gains related to hedged loans held for sale, commitments to originate loans for sale and commitments to sell loans 36,000,000   36,000,000   64,000,000
Aggregate fair value of derivative financial instruments in a liability position 53,000,000   53,000,000   114,000,000
Aggregate fair value of derivative financial instruments in asset position 4,000,000   4,000,000   3,000,000
Net fair value of derivative financial instruments in a net asset position 4,000,000   4,000,000   3,000,000
Collateral relating to net asset positions 4,000,000   4,000,000   3,000,000
Counterparties [Member]          
Derivative [Line Items]          
Post collateral requirements relating to positions 52,000,000   52,000,000   103,000,000
Clearinghouse Credit Facilities [Member]          
Derivative [Line Items]          
Amount of initial margin posted 136,000,000   136,000,000   135,000,000
Interest Income [Member]          
Derivative [Line Items]          
Cash flow hedges derivative instruments income 58,000,000 $ 82,000,000 207,000,000 $ 184,000,000  
Interest Rate Swap Agreements [Member]          
Derivative [Line Items]          
Increase decrease in net interest income due to interest rate swap agreements 67,000,000 $ 95,000,000 233,000,000 $ 212,000,000  
Interest Rate Swap Agreements [Member] | Maturity Period 2021 [Member]          
Derivative [Line Items]          
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)     4,000,000    
Interest Rate Swap Agreements [Member] | Maturity Period 2022 [Member]          
Derivative [Line Items]          
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)     119,000,000    
Interest Rate Swap Agreements [Member] | Maturity Period 2023 [Member]          
Derivative [Line Items]          
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)     44,000,000    
Interest Rate Contracts [Member]          
Derivative [Line Items]          
Notional amounts of derivative contracts entered into for trading account purposes 34,500,000,000   34,500,000,000   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 $ 815,000,000   $ 815,000,000   $ 776,000,000,000