Debt - Schedule of Debt (Parenthetical) (Detail) - USD ($) $ in Millions		Jun. 30, 2018		Feb. 28, 2018	Dec. 31, 2017		Oct. 31, 2016
Disposed of with Sale of UK Portfolio [Member]
Debt Instrument [Line Items]
Capital lease obligations				$ 15
SF CMBS Loan [Member]
Debt Instrument [Line Items]
Debt, gross		$ 725	[1]		$ 725	[1]	$ 725
HHV CMBS Loan [Member]
Debt Instrument [Line Items]
Debt, gross		1,275	[1]		1,275	[1]	$ 1,275
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, gross	[2]	0			$ 0
Amount available for borrowing		$ 1,000

[1] In October 2016, we entered into a $725 million commercial mortgaged-back securities (“CMBS”) loan secured by the Hilton San Francisco Union Square and the Parc 55 Hotel San Francisco (“SF CMBS Loan”) and a $1.275 billion CMBS loan secured by the Hilton Hawaiian Village (“HHV CMBS Loan”).

[2] $1 billion available.