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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Derivative [Line Items]      
Notional amounts of derivative contracts entered into for trading account purposes $ 37,700,000,000   $ 51,050,000,000
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)   $ 281,000,000  
Net unrealized pre-tax gains related to hedged loans held for sale, commitments to originate loans for sale and commitments to sell loans 55,000,000   64,000,000
Aggregate fair value of derivative financial instruments in a liability position 50,000,000   114,000,000
Aggregate fair value of derivative financial instruments in asset position 4,000,000   3,000,000
Net fair value of derivative financial instruments in a net asset position 4,000,000   3,000,000
Collateral relating to net asset positions 3,000,000   3,000,000
Counterparties [Member]      
Derivative [Line Items]      
Post collateral requirements relating to positions 50,000,000   103,000,000
Clearinghouse Credit Facilities [Member]      
Derivative [Line Items]      
Amount of initial margin posted 150,000,000   135,000,000
Interest Income [Member]      
Derivative [Line Items]      
Cash flow hedges drerivative instruments income   82,000,000 32,000,000
Interest Rate Swap Agreements [Member]      
Derivative [Line Items]      
Increase decrease in net interest income due to interest rate swap agreements 91,000,000 $ 36,000,000  
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) 74,000,000    
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) 165,000,000    
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) 42,000,000    
Interest Rate Contracts [Member]      
Derivative [Line Items]      
Notional amounts of derivative contracts entered into for trading account purposes 36,200,000,000   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 $ 910,000,000   $ 776,000,000,000