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Transfers of Financial Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Transaction
Mar. 31, 2011
Transfers of Financial Assets (Textual) [Abstract]    
Number of securitization transactions in which company has variable interest 5  
Principal amount of repurchased or replaced defaulted VOI notes receivable $ 7 $ 8
Obligation to receive cash flows from VIE $ 13 $ 11