Segment Information - Summary of Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 363		$ 281
Adjusted EBITDA	127	[1]	122	[1]
Depreciation	(14)		(10)
Amortization of intangible assets	(7)		(2)
Stock-based compensation	(16)		(14)
Operating income	90		96
Other expense, net	(4)		(2)
Income before income taxes	86		94
Provision for income taxes	(23)		(26)
Net income	63		68
Operating Segments | Hotel
Segment Reporting Information [Line Items]
Revenue	320		266
Adjusted EBITDA	132	[1]	124	[1]
Operating income	132		124
Operating Segments | Other Segment
Segment Reporting Information [Line Items]
Revenue	43		15
Adjusted EBITDA	(5)	[1]	(2)	[1]
Operating income	(5)		(2)
Corporate and Unallocated
Segment Reporting Information [Line Items]
Depreciation	(14)		(10)
Amortization of intangible assets	(7)		(2)
Stock-based compensation	(16)		(14)
Operating income	$ (37)		$ (26)

[1] Includes allocated general and administrative expenses in our Hotel segment of $20 million and $19 million; and in our Other segment of $6 million and $3 million for the three months ended March 31, 2015 and 2014, respectively.