Interest Rate Swap Derivatives Designated as Cash Flow Hedges (Detail) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Cash Flow Hedging Interest Rate Swap Swap Entered In Connection With Mortgage Loan On Hilton Melbourne South Wharf AUD		Dec. 31, 2013 Cash Flow Hedging Interest Rate Swap Swap Entered In Connection With Mortgage Loan On Hilton Melbourne South Wharf USD ($)		Dec. 31, 2014 Cash Flow Hedging Interest Rate Swap Swap Entered In Connection With Seven Properties New Zealand NZD		Dec. 31, 2013 Cash Flow Hedging Interest Rate Swap Swap Entered In Connection With Seven Properties New Zealand USD ($)
Derivative [Line Items]
Transaction Date				November 2011	[1]			February 2011	[2]
Notional Amount				62	[1]			79	[2]
Maturity Date				2016-11	[1]			2016-02	[2]
Swapped Index				Reuters BBSY	[1]			NZ$ Bank Bill	[2]
All-in-Rate				6.70%	[1]			7.15%	[2]
Change in fair value of derivative instruments	$ 19	$ (3)	$ (7)			$ 1	[1]			$ 2	[2]

[1] The swap was entered into in connection with the A$86 million ($71 million) mortgage loan on the Hilton Melbourne South Wharf.

[2] The swap was entered into in connection with the NZ$105 million ($82 million) mortgage loan on seven properties in New Zealand.