Supplemental Schedule of Noncash Investing and Financing Activities (Host Hotels & Resorts, Inc) - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	1 Months Ended		12 Months Ended
	Oct. 31, 2015	Jul. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2009
Other Significant Noncash Transactions [Line Items]
Redemptions of limited partner interests for common stock (shares)			0.6	0.1	0.3
Redemptions of limited partner interests for common stock			$ 10.0	$ 3.0	$ 6.0
2.5% Exchangeable Senior Debentures Due 2029
Other Significant Noncash Transactions [Line Items]
Exchangeable senior debentures, exchanged		$ 8.7		$ 399.0
Debt interest rate				2.50%		2.50%
Debt converted into shares of Host Inc. common stock	32.0			32.0