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Securities - Additional Information (Detail)
12 Months Ended
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Debt Securities, Available-for-sale [Line Items]      
Securities with changes to other than temporary impairment estimates related to credit component | security 0 0 0
Increase in credit losses for which an other-than-temporary impairment was previously recognized $ 0 $ 0 $ 0
Other assets [Member]      
Debt Securities, Available-for-sale [Line Items]      
Equity securities carried at fair value 283,000,000 278,000,000  
Equity securities without readily determinable fair values 12,000,000 7,000,000  
Federal Home Loan Bank Stock 110,000,000 156,000,000  
Federal Reserve Bank Stock $ 559,000,000 $ 631,000,000