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Receivables - Additional Information (Detail) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Disclosure Receivables Additional Information [Abstract]    
Deferred origination fees $ 212,000,000 $ 221,000,000
Net unamortized premium on our receivables 121,000,000 127,000,000
Secured financing 2,800,000,000 2,900,000,000
Receivables, collateralizing long-term debt $ 4,800,000,000 $ 4,900,000,000