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Derivative Financial Instruments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivative [Line Items]          
Notional amounts of derivative contracts entered into for trading account purposes $ 54,550,000,000   $ 54,550,000,000   $ 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 66,000,000   66,000,000   18,000,000
Aggregate fair value of derivative financial instruments in a liability position 127,000,000   127,000,000   51,000,000
Aggregate fair value of derivative financial instruments in asset position         6,000,000
Net fair value of derivative financial instruments in a net asset position         6,000,000
Collateral relating to net asset positions         5,000,000
Counterparties [Member]          
Derivative [Line Items]          
Post collateral requirements relating to positions 123,000,000   123,000,000   50,000,000
Clearinghouse Credit Facilities [Member]          
Derivative [Line Items]          
Amount of initial margin posted 125,000,000   125,000,000   84,000,000
Interest Rate Swap Agreements [Member]          
Derivative [Line Items]          
Increase decrease in net interest income due to interest rate swap agreements 95,000,000 $ 1,000,000 212,000,000 $ (23,000,000)  
Interest Rate Contracts [Member]          
Derivative [Line Items]          
Notional amounts of derivative contracts entered into for trading account purposes 36,600,000,000   36,600,000,000   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 $ 877,000,000   $ 877,000,000   $ 1,200,000,000