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Loans - Loans Classified as TDR Loans (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Financing Receivable, Modifications [Line Items]    
TDR loans during previous months which became contractually delinquent $ 20 $ 16
Commercial Loan [Member]
   
Financing Receivable, Modifications [Line Items]    
TDR loans during previous months which became contractually delinquent 12 2
Commercial Loan [Member] | Construction and Other Real Estate [Member]
   
Financing Receivable, Modifications [Line Items]    
TDR loans during previous months which became contractually delinquent 12 2
Consumer Loans [Member]
   
Financing Receivable, Modifications [Line Items]    
TDR loans during previous months which became contractually delinquent 8 14
Consumer Loans [Member] | Residential Mortgage [Member]
   
Financing Receivable, Modifications [Line Items]    
TDR loans during previous months which became contractually delinquent 8 13
Consumer Loans [Member] | Credit Cards [Member]
   
Financing Receivable, Modifications [Line Items]    
TDR loans during previous months which became contractually delinquent $ 0 $ 1