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Loans and Leases and the Allowance for Credit Losses - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Loans And Leases Receivable [Line Items]    
Contractual principal and interest payments $ 716 $ 768
Commercial real estate loans held for sale $ 128 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 $ 169 172
Loans secured by residential real estate that were in the process of foreclosure $ 309 $ 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 $ 269 $ 353
Carrying value of loans for which partial charge-off has been recognized 52 55
Mortgage loans, customer balance outstanding 20 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 24 21
Mortgage loans, customer balance outstanding $ 32 $ 28