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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Derivative [Line Items]          
Notional amounts of derivative contracts entered into for trading account purposes $ 21,400,000,000   $ 21,400,000,000   $ 23,350,000,000
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)     377,000,000    
Net unrealized pre-tax gains related to hedged loans held for sale, commitments to originate loans for sale and commitments to sell loans 12,000,000   12,000,000   24,000,000
Aggregate fair value of derivative financial instruments in a liability position 1,000,000   1,000,000   35,000,000
Aggregate fair value of derivative financial instruments in asset position         7,000,000
Net fair value of derivative financial instruments in a net asset position 316,000,000   316,000,000   7,000,000
Collateral relating to net asset positions 308,000,000   308,000,000   6,000,000
Counterparties [Member]          
Derivative [Line Items]          
Post collateral requirements relating to positions 0   0   33,000,000
Clearinghouse Credit Facilities [Member]          
Derivative [Line Items]          
Amount of initial margin posted 215,000,000   215,000,000   132,000,000
Interest Income [Member]          
Derivative [Line Items]          
Cash flow hedges derivative instruments income (22,000,000) $ 58,000,000 36,000,000 $ 207,000,000  
Interest Rate Swap Agreements [Member]          
Derivative [Line Items]          
Increase decrease in net interest income due to interest rate swap agreements (22,000,000) $ 67,000,000 50,000,000 $ 233,000,000  
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)     16,000,000    
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)     75,000,000    
Interest Rate Swap Agreements [Member] | Maturity Period 2025 [Member]          
Derivative [Line Items]          
Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges, Pretax, Accumulated Other Comprehensive Income (Loss)     286,000,000    
Interest Rate Contracts [Member]          
Derivative [Line Items]          
Notional amounts of derivative contracts entered into for trading account purposes 45,600,000,000   45,600,000,000   32,600,000,000
Foreign Exchange and Other Option and Futures Contracts [Member]          
Derivative [Line Items]          
Notional amounts of derivative contracts entered into for trading account purposes $ 1,900,000,000   $ 1,900,000,000   $ 1,100,000,000