Segment Information (Summary Of Segment Information) (Details) (USD $) In Millions	3 Months Ended					6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Mar. 31, 2010	Jun. 30, 2011		Jun. 30, 2010
Net revenues	$ 1,090		$ 963			$ 2,041		$ 1,849
EBITDA	276		217			480		392
Depreciation and amortization	45		42			90		85
Interest expense	37	[1]	36			81	[2]	86	[3]
Interest income	(2)		(2)			(3)		(2)
Income before income taxes	196		141			312		223
Non-cash impairment charges						13
Cost of early extinguishment of debt facilities	1				2
Benefit for reversal of costs incurred						1
Lodging [Member]
Net revenues	190		178			339		322
EBITDA	66		49	[4]		92	[5]	82	[6]
Non-cash impairment charges						13
Acquisition cost								1
Vacation Exchange and Rentals [Member]
Net revenues	361		281			716		582
EBITDA	106	[7]	78			199	[8]	158	[9]
Acquisition cost								4
Restructuring costs						7
Vacation Ownership [Member]
Net revenues	541		505			992		950
EBITDA	130		104			227	[4]	186
Corporate [Member]
Net revenues	(2)	[10],[11]	(1)	[10],[11]		6	[11],[12]	5	[11],[12]
EBITDA	(26)	[10],[11]	(14)	[10],[11]		38	[11],[12]	34	[11],[12]
Net benefit related to adjustment of contingent liabilities and assets	3					8
Net expense related to adjustment of contingent liabilities and assets								1
Corporate costs	23		14			47		32
Cost of early extinguishment of debt facilities								12
Corporate [Member] | Revolving Foreign Credit Facility [Member]
Cost of early extinguishment of debt facilities								16
Reportable Segments [Member]
Net revenues	1,092		964			2,047		1,854
EBITDA	$ 302		$ 231			$ 518		$ 426

[1] Includes (i) $3 million of interest related to value added tax accruals and (ii) $1 million of costs incurred for the repurchase of a portion of the Company's Convertible Notes during the second quarter of 2011.

[2] Includes (i) $12 million of costs incurred for the repurchase of a portion of the Company's Convertible Notes during the first half of 2011 and (ii) $3 million of interest related to value added tax accruals.

[3] Includes $16 million of costs incurred for the early extinguishment of the Company's term loan and revolving foreign credit facilities during March 2010.

[4] Includes $1 million related to costs incurred in connection with the Company's acquisition of the Tryp brand during June 2010.

[5] Includes a non-cash impairment charge of $13 million related to a write-down of an international joint venture in the Company's lodging business.

[6] Includes a $1 million benefit for the reversal of costs incurred as a result of various strategic initiatives commenced by the Company during 2008.

[7] Includes (i) a $31 million net benefit resulting from a refund of value added taxes and (ii) $7 million of restructuring costs incurred in connection with a strategic initiative commenced by the Company during 2010.

[8] Includes (i) a $31 million net benefit resulting from a refund of value added taxes and (ii) $7 million of restructuring cost incurred in connection with a strategic initiative commenced by the Company during 2010.

[9] Includes $4 million related to costs incurred in connection with the Company's acquisition of Hoseasons during March 2010.

[10] Includes (i) $3 million of a net expense related to the resolution of and adjustment to certain contingent liabilities and assets resulting from the Separation during the three months ended June 30, 2011 and (ii) $23 million and $14 million of corporate costs during the three months ended June 30, 2011 and 2010, respectively.

[11] Includes the elimination of transactions between segments.

[12] Includes (i) $8 million of a net benefit and $1 million of a net expense related to the resolution of and adjustment to certain contingent liabilities and assets resulting from the Separation during the six months ended June 30, 2011 and 2010, respectively, and (ii) $47 million and $32 million of corporate costs during the six months ended June 30, 2011 and 2010, respectively.