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Loans and Allowance for Credit Losses - Additional Information (Detail)
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
SecurityLoan
Dec. 31, 2016
USD ($)
MortgageLoan
Dec. 31, 2015
USD ($)
Loans and Allowance for Credit Losses [Line Items]      
Loans pledged at the Federal Home Loan Bank $ 84,500,000,000 $ 84,500,000,000 $ 78,100,000,000
Loans pledged at the Federal Reserve Bank 66,500,000,000 66,500,000,000 63,400,000,000
Unearned interest and deferred fees and costs on originated loans 672,000,000 672,000,000 550,000,000
Foreclosed residential real estate property included in other real estate owned 201,000,000 201,000,000 282,000,000
Foreclosed residential real estate property included in other real estate owned excluding covered assets 175,000,000 175,000,000 250,000,000
Foreclosed residential real estate related to mortgage loans whose payments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs 373,000,000 373,000,000 535,000,000
Residential mortgage loans secured by residential real estate in process of foreclosure 2,100,000,000 $ 2,100,000,000 2,600,000,000
Number of residential mortgage loans, home equity and second mortgage loans, and GNMA loans where trial period was unsuccessful and no longer eligible for a permanent modification | MortgageLoan   1,697  
Outstanding balance of residential mortgage loans, home equity and second mortgage loans, and GNMA loans where trial period was unsuccessful and no longer eligible for a permanent modification   $ 230,000,000  
Government National Mortgage Association [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Residential mortgage loans secured by residential real estate in process of foreclosure purchased from GNMA mortgage pools whose repayments are insured by the Federal Housing Administration or guaranteed by the Department of Veterans Affairs $ 1,600,000,000 $ 1,600,000,000 $ 1,900,000,000
Home Equity and Second Mortgages [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of loans in trial period | SecurityLoan 6    
Home Equity and Second Mortgages [Member] | Maximum [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Outstanding balance of loans in trial period $ 1,000,000    
Estimated post-modification balance of loans in trial period $ 1,000,000    
Residential Mortgages [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of loans in trial period | SecurityLoan 106    
Outstanding balance of loans in trial period $ 11,000,000    
Estimated post-modification balance of loans in trial period $ 13,000,000    
Government National Mortgage Association [Member]      
Loans and Allowance for Credit Losses [Line Items]      
Number of loans in trial period | SecurityLoan 1,366    
Outstanding balance of loans in trial period $ 179,000,000    
Estimated post-modification balance of loans in trial period $ 175,000,000