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Loans - Delinquency Ratio for Consumer Loan - Additional Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Residential Mortgage Loan Delinquency Carried At Lower Of Amortized Cost Or Fair Value Less Cost To Sell $ 285 $ 342
Residential Mortgage Loan Delinquency Carried At Lower Of Amortized Cost Or Fair Value Less Cost To Sell, Held-for-Sale 1 1
Consumer Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Mortgage Loans in Process of Foreclosure, Amount $ 162 $ 159