Interest Rate Swap Derivatives Designated as Cash Flow Hedges (Parenthetical) (Detail) NZD in Millions, AUD in Millions, $ in Millions	Jun. 30, 2015 USD ($) Hotel	Jun. 30, 2015 AUD Hotel	Jun. 30, 2015 NZD Hotel	Dec. 31, 2014 USD ($)
Derivative [Line Items]
Mortgage debt | $	$ 389			$ 404
Hotels	111	111	111
Australia
Derivative [Line Items]
Hotels	1	1	1
New Zealand
Derivative [Line Items]
Hotels	7	7	7
Interest Rate Swap | Australia | Swap Entered In Connection With Mortgage Loan On Hilton Melbourne South Wharf
Derivative [Line Items]
Mortgage debt	$ 66	AUD 86
Interest Rate Swap | New Zealand | Swap Entered In Connection With Seven Properties
Derivative [Line Items]
Mortgage debt	$ 71		NZD 105
Hotels	7	7	7