Interest Rate Swap Derivatives Designated as Cash Flow Hedges (Detail) (Cash Flow Hedging) In Millions, unless otherwise specified	3 Months Ended						3 Months Ended
	Mar. 31, 2013 Interest Rate Swap 1 USD ($)		Mar. 23, 2012 Interest Rate Swap 1 USD ($)		Mar. 31, 2013 Interest Rate Swap 1 AUD		Mar. 31, 2013 Interest Rate Swap 2 NZD		Mar. 23, 2012 Interest Rate Swap 2 USD ($)
Derivative [Line Items]
Notional Amount					62	[1]	79	[2]
Transaction Date	November 2011	[1]					February 2011	[2]
Maturity Date	2016-11	[1]					2016-02	[2]
Swapped Index	Reuters BBSY	[1]					NZ$ Bank Bill	[2]
All-in Rate					6.70%	[1]	7.15%	[2]
Change in Fair Value Gain (Loss)	$ 1	[1]	$ 1	[1]					$ 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.