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Risk Ratings of the Notional Amount of Risk Participation Agreements (Detail) (Interest Rate Contract, USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Notional amount of the risk participations agreements $ 1,203 $ 1,006
Lender Concentration Risk | Pass
   
Notional amount of the risk participations agreements 1,153 993
Lender Concentration Risk | Risk Level, Special Mention
   
Notional amount of the risk participations agreements 38  
Lender Concentration Risk | Risk Level, Substandard
   
Notional amount of the risk participations agreements $ 12 $ 13