Securitized Vacation Ownership Debt (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Long term and short term securitized vacation ownership debt
Long term debt including current maturities	$ 422	$ 494
Less current maturities	(121)	(127)
Long-term securitized debt	301	367
2003 securitization, interest rates ranging from 3.95% to 6.96%, maturing 2018 [Member]
Long term and short term securitized vacation ownership debt
Long term debt including current maturities	13	17
Interest rate, minimum	0.0395
Interest rate, maximum	0.0696
2005 securitization, interest rates ranging from 5.25% to 6.29%, maturing 2018 [Member]
Long term and short term securitized vacation ownership debt
Long term debt including current maturities	45	55
Interest rate, minimum	0.0525
Interest rate, maximum	0.0629
2006 securitization, interest rates ranging from 5.28% to 5.85%, maturing 2018 [ Member]
Long term and short term securitized vacation ownership debt
Long term debt including current maturities	32	39
Interest rate, minimum	0.0528
Interest rate, maximum	0.0585
2009 securitization, interest rate at 5.81%, maturing 2016 [Member]
Long term and short term securitized vacation ownership debt
Long term debt including current maturities	111	128
Debt instrument interest rate	5.81%
2010 securitization, interest rates ranging from 3.65% to 4.75%, maturing 2018 [Member]
Long term and short term securitized vacation ownership debt
Long term debt including current maturities	$ 221	$ 255
Interest rate, minimum	0.0365
Interest rate, maximum	0.0475