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Securities - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
security
Jun. 30, 2017
USD ($)
security
Jun. 30, 2018
USD ($)
security
Jun. 30, 2017
USD ($)
security
Dec. 31, 2017
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Increase in credit losses for which an other-than-temporary impairment was previously recognized $ 0 $ 0 $ 0 $ 0  
Securities with changes to other than temporary impairment estimates related to credit component | security 0 0 0 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 5,000,000   5,000,000    
Federal Home Loan Bank Stock 201,000,000   201,000,000   $ 201,000,000
Federal Reserve Bank Stock $ 631,000,000   $ 631,000,000   $ 631,000,000