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Securities - Additional Information (Detail) - USD ($)
3 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]        
Securities available-for-sale, allowance for credit losses [2]   $ 2,000,000 [1] $ 3,000,000  
Securities held-to-maturity, allowance for credit losses [2]   2,000,000 [1] $ 2,000,000  
Securities held-to-maturity, past due   0    
Securities held-to-maturity, nonaccrual   0    
Equity securities without readily determinable fair values, impairment loss adjustment $ 2,000,000      
Equity securities without readily determinable fair values, impairment loss       $ 0
Other assets [Member]        
Debt Securities, Available-for-sale [Line Items]        
Equity securities carried at fair value   283,000,000   283,000,000
Equity securities without readily determinable fair values   14,000,000   12,000,000
Federal Home Loan Bank Stock   304,000,000   110,000,000
Federal Reserve Bank Stock   $ 559,000,000   $ 559,000,000
Accounting Standards Update 2020-04 [Member]        
Debt Securities, Available-for-sale [Line Items]        
Carrying value of LIBOR-linked variable rate held-to-maturity secrurities maturing beyond 2021, sold in the period 340,000,000      
Gain on sale of LIBOR-linked variable rate held-to-maturity securities maturing beyond 2021 (less than) $ 1,000,000      
[1] As discussed in Note 21, "New Accounting Pronouncements," beginning January 1, 2020, an allowance for credit losses is recognized for debt securities while, prior to January 1, 2020, debt securities were assessed for other-than-temporary impairment. At December 31, 2019, we did not consider any of our debt securities to be other-than-temporarily impaired.
[2] See Note 4, "Securities," for additional information regarding the allowance for credit losses associated with our security portfolios.