Goodwill and Intangible Assets, Net - Summary of Changes in Goodwill (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Goodwill [Line Items]
Beginning balance	$ 734
Acquisitions	17	[1]
Disposition	(1)	[1]
Other adjustments	(15)	[2]
Ending balance	735
Hotel Segment
Goodwill [Line Items]
Beginning balance	442
Acquisitions	1	[1]
Disposition	(1)	[1]
Other adjustments	0	[2]
Ending balance	442
Other Segment
Goodwill [Line Items]
Beginning balance	292
Acquisitions	16	[1]
Other adjustments	(15)	[2]
Ending balance	$ 293

[1] Refer to “Note 3 – Acquisitions and Dispositions,” above for additional information.

[2] Other adjustments are primarily related to impact of changes in foreign exchange rates.