Interest Rate Swap Derivatives Designated as Cash Flow Hedges (Detail) (Cash Flow Hedging) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended				3 Months Ended				9 Months Ended
	Sep. 30, 2013 Interest Rate Swap 1 USD ($)		Sep. 07, 2012 Interest Rate Swap 1 USD ($)		Sep. 30, 2013 Interest Rate Swap 1 USD ($)		Sep. 30, 2013 Interest Rate Swap 1 AUD		Sep. 30, 2013 Interest Rate Swap 2 USD ($)		Sep. 07, 2012 Interest Rate Swap 2 USD ($)		Sep. 07, 2012 Interest Rate Swap 2 USD ($)		Sep. 30, 2013 Interest Rate Swap 2 USD ($)		Sep. 30, 2013 Interest Rate Swap 2 NZD
Derivative [Line Items]
Transaction Date					November 2011	[1]									Febuary 2011	[2]
Total Notional Amount							62	[1]									79	[2]
Maturity Date					2016-11	[1]									2016-02	[2]
Swapped Index					Reuters BBSY	[1]									NZ$ Bank Bill	[2]
All-in Rate							6.70%	[1]									7.15%	[2]
Change in Fair Value Gain (Loss)		[1]		[1]	$ 1	[1]				[2]		[2]	$ (2)	[2]	$ 1	[2]

[1] The swap was entered into in connection with the A$82 million ($85 million) mortgage loan on the Hilton Melbourne South Wharf.

[2] The swap was entered into in connection with the NZ$105 million ($87 million) mortgage loan on seven properties in New Zealand.