Acquisitions (Shell Vacation LLC, Estimated Fair Values of Assets Acquired and Liabilities Assumed) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			12 Months Ended			12 Months Ended			12 Months Ended
	Sep. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Sep. 13, 2012 Shell Vacation LLC [Member]	Dec. 31, 2012 Shell Vacation LLC [Member] Customer Relationships [Member]	Sep. 13, 2012 Shell Vacation LLC [Member] Customer Relationships [Member]		Dec. 31, 2012 Shell Vacation LLC [Member] Trademarks [Member]	Sep. 13, 2012 Shell Vacation LLC [Member] Trademarks [Member]		Dec. 31, 2012 Shell Vacation LLC [Member] Management Contracts [Member]	Sep. 13, 2012 Shell Vacation LLC [Member] Management Contracts [Member]
Business Acquisition [Line Items]
Vacation ownership contracts receivables				$ 140
Inventory		7		47
Definite-lived intangible assets	15	3				34	[1]		4	[2]		21	[3]
Goodwill	11	4		25
Property and equipment		6		22
Other current and non-current assets				34
Total assets acquired				327
Other current liabilities				56
Assumed debt				79
Other non-current liabilities				10
Total liabilities assumed				145
Noncontrolling interest		1	0	2
Net assets acquired				$ 180
Weighted average useful life (in years) of definite-lived intangible assets	16 years	11 years			15 years			7 years			15 years

[1] Represents customer relationships with a weighted average life of 15 years; included within Franchise agreements and other intangibles, net on the Consolidated Balance Sheet.

[2] Represents trademarks with a life of 7 years.

[3] Represents management contracts with a weighted average life of 15 years; included within Franchise agreements and other intangibles, net on the Consolidated Balance Sheet.