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Loans and Leases and the Allowance for Credit Losses - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Loans And Leases Receivable [Line Items]    
Contractual principal and interest payments $ 662 $ 768
Commercial real estate loans held for sale $ 228 39
Loan delinquent period 90 days  
Minimum delinquency period for loan level collectability analysis consumer mortgage 150 days  
Amount of foreclosed residential real estate property held $ 158 172
Loans secured by residential real estate that were in the process of foreclosure $ 305 $ 315
Maximum [Member]    
Loans And Leases Receivable [Line Items]    
Purchased impaired loans as a percentage of total assets 1.00% 1.00%
Residential Mortgage Loans [Member]    
Loans And Leases Receivable [Line Items]    
Mortgage loans held for sale $ 374 $ 353
Carrying value of loans for which partial charge-off has been recognized 52 55
Mortgage loans on real real estate not requiring charge off due to collateral carrying amount 18 20
Home Equity Loans and Lines of Credit [Member]    
Loans And Leases Receivable [Line Items]    
Carrying value of loans for which partial charge-off has been recognized 31 21
Mortgage loans on real real estate not requiring charge off due to collateral carrying amount $ 39 $ 28