Historical Cost and Redemption Values for Non-Controlling Interests (Detail) $ / shares in Units, shares in Millions, $ in Millions		Sep. 30, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Book value		$ 148	$ 225
HOST HOTELS & RESORTS L.P.
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
OP units outstanding | shares		9.2	9.3
Market price per Host Inc. common share | $ / shares		$ 15.81	$ 23.77
Shares issuable upon conversion of one OP unit		1.021494	1.021494
Redemption value		$ 148	$ 225
Historical cost		89	94
Book value	[1]	$ 148	$ 225

[1] The book value recorded is equal to the greater of redemption value or historical cost.