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Sales of Receivables and Servicing Rights - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale            
Amortization of mortgage servicing rights $ 34,000,000 $ 40,000,000   $ 89,000,000 $ 145,000,000  
Sevicing of residential mortgage loans for other investors 66,800,000,000     66,800,000,000   69,200,000,000
Carry Value Of Loans Leases Or Lines Of Credit Securitized     509,000,000      
Fair value of automobile loan securitization servicing asset     $ 6,000,000