Investment in Affiliates - Additional Information (Detail) € in Millions, AUD in Millions, $ in Millions							1 Months Ended	3 Months Ended			9 Months Ended
	Oct. 28, 2015 USD ($) Hotel	Oct. 28, 2015 EUR (€) Hotel	Oct. 14, 2015 USD ($)	Oct. 14, 2015 AUD	Jul. 08, 2015 USD ($)	Jul. 08, 2015 EUR (€)	Jul. 31, 2015	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 AUD	Sep. 30, 2015 USD ($) Hotel	Sep. 30, 2014 USD ($)
Investments In And Advances To Affiliates [Line Items]
Distributions from equity investments | $											$ 9
Number of hotels											110
Proceeds from sales of assets, net | $											$ 183	$ 274
Mortgage repayment | $												$ 373
Subsequent Event
Investments In And Advances To Affiliates [Line Items]
Number of hotels	108	108
Fund II | European Joint Venture
Investments In And Advances To Affiliates [Line Items]
Capital commitment extension period							one year
European Joint Venture
Investments In And Advances To Affiliates [Line Items]
Number of hotels											18
European Joint Venture | Subsequent Event
Investments In And Advances To Affiliates [Line Items]
Number of hotels	10	10
European Joint Venture | 8 Hotel Portfolio | Subsequent Event
Investments In And Advances To Affiliates [Line Items]
Number of hotels	8	8
Proceeds from sales of assets, net	$ 464	€ 420
Mortgage repayment	$ 204	€ 185
European Joint Venture | 8 Hotel Portfolio | Scenario Forecast
Investments In And Advances To Affiliates [Line Items]
Gain on sale of asset								$ 29	€ 26
European Joint Venture | Fund I | Subsequent Event
Investments In And Advances To Affiliates [Line Items]
Number of hotels	3	3
European Joint Venture | Fund I | Crowne Plaza Hotel Amsterdam City Centre
Investments In And Advances To Affiliates [Line Items]
Distributions from equity investments					$ 21	€ 19
European Joint Venture | Fund II | Subsequent Event
Investments In And Advances To Affiliates [Line Items]
Number of hotels	7	7
Asia/Pacific Joint Venture | Four Points by Sheraton Perth | Subsequent Event
Investments In And Advances To Affiliates [Line Items]
Proceeds from sales of assets, net			$ 67	AUD 91.5
Mortgage repayment			$ 32	AUD 43.0
Asia/Pacific Joint Venture | Four Points by Sheraton Perth | Scenario Forecast
Investments In And Advances To Affiliates [Line Items]
Gain on sale of asset								$ 17		AUD 23.0