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Transfers of Financial Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Transactions
Jun. 30, 2013
Jun. 30, 2014
Transactions
Jun. 30, 2013
Transfers And Servicing [Abstract]        
Number of securitization transactions in which company has variable interest 4   4  
Principal amount of repurchased or replaced defaulted VOI notes receivable $ 5 $ 6 $ 9 $ 11
Obligation to receive cash flows from VIE $ 10 $ 14 $ 21 $ 27