Segment and Geographic Information - Reconciliation of Adjusted EBITDA to Net Income (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Segment Reporting [Abstract]
Adjusted EBITDA	[1]									$ 466	$ 468	[2]	$ 379	[2]
Depreciation										(57)	(47)		(30)
OIBA	[3]										421		349
Amortization of intangible assets										(36)	(18)		(6)
Stock-based compensation										(72)	(63)		(49)
Other expense, net										7	(18)		(10)
Provision for income taxes										(41)	(96)		(79)
Net income		$ 3	$ 74	$ 58	$ 63	$ 36	$ 54	$ 68	$ 68	$ 198	$ 226		$ 205

[1] Includes allocated general and administrative expenses in our Hotel segment of $85 million, $87 million and $72 million; and in our Other segment of $28 million, $18 million and $9 million for the years ended December 31, 2015, 2014 and 2013, respectively.

[2] (1) Hotel segment Adjusted EBITDA includes charitable contributions to the Foundation which were funded in cash of $8 million and $7 million, for the years ended December 31, 2014 and 2013, respectively. Our pledge obligation was calculated at 2.0% of OIBA in 2014 and 2013, which was calculated as follows:

[3] (1) We defined OIBA as net income (loss) plus: (1) provision for income taxes; (2) other income (expense), net; (3) stock-based compensation; (4) amortization of intangible assets; and (5) non-recurring expenses. This operating metric was only used by our management to calculate our annual obligation to the Foundation.