Fair Value (Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) (USD $) In Millions	Jun. 30, 2011		Dec. 31, 2010
Vacation ownership contract receivables, net, carrying amount	$ 2,898		$ 2,982
Vacation ownership contract receivables, net, fair value	3,246		2,782
Total debt, carrying amount	3,732	[1]	3,744	[1]
Total debt, fair value	3,884	[1]	3,871	[1]
Foreign Exchange Contract [Member]
Derivative asset, carrying amount	5		4
Derivative asset, fair value	5		4
Derivative liabilities, carrying amount	(8)		(12)
Derivative liabilities, fair value	8		12
Interest Rate Contract [Member]
Derivative asset, carrying amount	12		7
Derivative asset, fair value	12		7
Derivative liabilities, carrying amount	(17)		(27)
Derivative liabilities, fair value	17		27
Bifurcated Conversion Feature [Member]
Derivative liabilities, fair value	21		162
Call Options [Member]
Derivative asset, carrying amount	21		162
Derivative asset, fair value	$ 21		$ 162

[1] As of June 30, 2011 and December 31, 2010, includes $21 million and $162 million, respectively, related to the Bifurcated Conversion Feature liability.