Long-Term Debt And Borrowing Arrangements (2011 Debt Issuances) (Details) (USD $)							0 Months Ended						9 Months Ended
	Sep. 30, 2011		Dec. 31, 2010		Jul. 15, 2011 Actual [Member] Five Year Revolving Credit Facility [Member]	Jul. 15, 2011 Previously Reported [Member] Five Year Revolving Credit Facility [Member]	Mar. 15, 2011 5.625% Senior Unsecured Notes [Member]	Mar. 01, 2011 5.625% Senior Unsecured Notes [Member]	Sep. 30, 2011 Sierra Timeshare 2011-1 Receivables Funding LLC [Member]	Mar. 25, 2011 Sierra Timeshare 2011-1 Receivables Funding LLC [Member]	Sep. 30, 2011 Sierra Timeshare 2011-2 Receivables Funding LLC [Member]	Aug. 31, 2011 Sierra Timeshare 2011-2 Receivables Funding LLC [Member]	Sep. 30, 2011 Five Year Revolving Credit Facility [Member]	Sep. 30, 2011 Sierra Timeshare Conduit Receivables Funding II LLC [Member]
Debt instrument face value								$ 250,000,000		$ 400,000,000		$ 300,000,000
Proceeds from senior unsecured notes							245,000,000
Debt instrument, maturity date							Mar. 01, 2021
Total debt, carrying amount	3,829,000,000	[1]	3,744,000,000	[1]					290,000,000		274,000,000
Debt instruments stated interest percentage								5.625%
Debt instrument weighted average coupon rate										3.70%		4.01%
Credit facility maximum borrowing capacity														600,000,000
Debt instrument, advance rate percentage										98		92
Revolving credit facility					1,000,000,000	980,000,000
Revolving credit facility, expiration date													July 15, 2016
Revolving credit facility, commitment fee													22.50%
Revolving credit facility interest rate													LIBOR plus 142.5 basis points
Credit facility amount, outstanding borrowings													169,000,000
Letters of credit outstanding													11,000,000
Revolving credit facility remaining capacity													$ 820,000,000

[1] As of September 30, 2011 and December 31, 2010, includes $16 million and $162 million, respectively, related to the Bifurcated Conversion Feature liability.