Restructuring (Activity Related To The Restructuring Costs) (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011
Liability as of December 31, 2010	$ 20
Costs Recognized	6
Cash payments	(11)
Liability as of June 30, 2011	17
Restructuring Reserve, Settled without Cash	2
Benefit for reversal of costs incurred	1
Vacation Exchange and Rentals [Member]
Liability as of June 30, 2011	9
Vacation Ownership [Member]
Liability as of June 30, 2011	6
Benefit for reversal of costs incurred	1
Personnel-Related [Member]
Liability as of December 31, 2010	9
Costs Recognized
Cash payments	(7)
Liability as of June 30, 2011	2
Facility-Related [Member]
Liability as of December 31, 2010	11
Costs Recognized	6
Cash payments	(4)
Liability as of June 30, 2011	15
Restructuring Reserve, Settled without Cash	$ 2