Interest Rate Swap Derivatives Designated as Cash Flow Hedges (Detail) (Cash Flow Hedging) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended						3 Months Ended				6 Months Ended
	Jun. 30, 2013 Interest Rate Swap 1 USD ($)		Jun. 15, 2012 Interest Rate Swap 1 USD ($)		Jun. 30, 2013 Interest Rate Swap 1 USD ($)		Jun. 15, 2012 Interest Rate Swap 1 USD ($)		Jun. 30, 2013 Interest Rate Swap 1 AUD		Jun. 30, 2013 Interest Rate Swap 2 USD ($)		Jun. 15, 2012 Interest Rate Swap 2 USD ($)		Jun. 30, 2013 Interest Rate Swap 2 USD ($)		Jun. 15, 2012 Interest Rate Swap 2 USD ($)		Jun. 30, 2013 Interest Rate Swap 2 NZD
Derivative [Line Items]
Notional Amount									62	[1]									79	[2]
Transaction Date					November 2011	[1]									February 2011	[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]	$ (3)	[1]	$ 1	[1]	$ (2)	[1]			$ 1	[2]	$ (1)	[2]	$ 1	[2]		[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.