Transfer And Servicing Of Financial Assets (Assets And Liabilities Of Vacation Ownership SPEs) (Details) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010		Dec. 31, 2009
Securitized contract receivables, gross	$ 2,862		$ 2,982
Total assets	9,022		9,416
Securitized term notes	1,730		1,650
Total liabilities	6,603		6,499
SPE assets in excess of SPE liabilities	755		1,193
Securitized contract receivables, net, current	294		295
Securitized contract receivables, net, noncurrent	2,568		2,687
Vacation Ownership SPE [Member]
Securitized contract receivables, gross	2,358	[1]	2,703	[1]
Securitized restricted cash	124	[2]	138	[2]
Interest receivables on securitized contract receivables	19	[3]	22	[3]
Other assets	1	[4]	2	[4]
Total assets	2,502	[5]	2,865	[5]
Securitized term notes	1,512	[6]	1,498	[6]
Securitized conduit facilities	218	[6]	152	[6]
Other liabilities	17	[7]	22	[7]
Total liabilities	1,747		1,672
SPE assets in excess of SPE liabilities	755		1,193
Securitized contract receivables, net, current	245		266
Securitized contract receivables, net, noncurrent	2,113		2,437
Securitized restricted cash, current	65		77
Securitized restricted cash, non current	59		61
Deferred financing cost related to securitized debt	24		22
Secured debt and conduit facilities, current	179		223
Secured debt and conduit facilities, noncurrent	1,551		1,427
Interest rate derivative contracts and accrued interest, current	3		3		4
Interest rate derivative contracts and accrued interest, non current	$ 14		$ 19

[1] Included in current ($245 million and $266 million as of September 30, 2011 and December 31, 2010, respectively) and non-current ($2,113 million and $2,437 million as of September 30, 2011 and December 31, 2010, respectively) vacation ownership contract receivables on the Consolidated Balance Sheets.

[2] Included in other current assets ($65 million and $77 million as of September 30, 2011 and December 31, 2010, respectively) and other non-current assets ($59 million and $61 million as of September 30, 2011 and December 31, 2010, respectively) on the Consolidated Balance Sheets.

[3] Included in trade receivables, net on the Consolidated Balance Sheets.

[4] Includes interest rate derivative contracts and related assets; included in other non-current assets on the Consolidated Balance Sheets.

[5] Excludes deferred financing costs of $24 million and $22 million as of September 30, 2011 and December 31, 2010, respectively, related to securitized debt.

[6] Included in current ($179 million and $223 million as of September 30, 2011 and December 31, 2010, respectively) and long-term ($1,551 million and $1,427 million as of September 30, 2011 and December 31, 2010, respectively) securitized vacation ownership debt on the Consolidated Balance Sheets.

[7] Primarily includes interest rate derivative contracts and accrued interest on securitized debt; included in accrued expenses and other current liabilities ($3 million as of both September 30, 2011 and December 31, 2010) and other non-current liabilities ($14 million and $19 million as of September 30, 2011 and December 31, 2010, respectively) on the Consolidated Balance Sheets.