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Key Assumptions Used in Calculating Fair Value of Residential Mortgage Servicing Rights (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]    
Expected Weighted Average Life 93 months 64 months
Constant Prepayment Speed 8.30% 15.40%
Discount Rate 10.50% 10.50%
Primary Mortgage Rate to Refinance 4.50% 3.60%
Current
   
Mortgage Loans on Real Estate [Line Items]    
Cost to service per loan per year $ 53 $ 53
30-59 days or less delinquent
   
Mortgage Loans on Real Estate [Line Items]    
Cost to service per loan per year 103 103
60-89 days delinquent
   
Mortgage Loans on Real Estate [Line Items]    
Cost to service per loan per year 203 203
90-119 days delinquent
   
Mortgage Loans on Real Estate [Line Items]    
Cost to service per loan per year 303 303
Over 120 days delinquent
   
Mortgage Loans on Real Estate [Line Items]    
Cost to service per loan per year $ 553 $ 553