Variable Interest Entities (Summary Of Total Vacation Ownership Receivables And Other Securitized Assets, Net Of Securitized Liabilities And Allowance For Loan Losses) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Schedule Of Transfer And Financial Assets [Line Items]
SPE assets in excess of SPE liabilities	$ 495	$ 471
Less: Allowance for loan losses	(586)	(581)	$ (565)	$ (581)
Total, net	792	719
Non Securitized Receivable [Member]
Schedule Of Transfer And Financial Assets [Line Items]
Non-securitized contract receivables	$ 883	$ 829