Equity of Host Inc. and Capital of Host L.P. - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Feb. 29, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Oct. 29, 2015	Apr. 30, 2015
Stockholders Equity Note [Line Items]
Common stock, shares authorized		1,050,000,000	1,050,000,000
Common stock, par value		$ 0.01	$ 0.01
Common stock, shares outstanding		750,300,000	755,800,000
Dividend policy		The amount of any future dividends will be determined by Host Inc.’s Board of Directors.
Dividends taxable as ordinary income to stockholders		80.00%	65.00%
Dividends taxable as qualified income to stockholders		8.00%
Dividends taxable as unrecaptured Section 1250 gain		7.00%	13.00%
Capital Gains Distribution Percentage		5.00%	22.00%
Dividend per share, declared		$ 0.80	$ 0.75	$ 0.46
Lower Limit
Stockholders Equity Note [Line Items]
Percentage of annual taxable income Host Inc is required to distribute		90.00%
HOST HOTELS & RESORTS, INC.
Stockholders Equity Note [Line Items]
Common stock, shares authorized		1,050,000,000	1,050,000,000
Common stock, par value		$ 0.01	$ 0.01
Common stock, shares outstanding		750,300,000	755,800,000
Preferred stock, shares authorized		50,000,000
Preferred stock, no par value
Preferred stock, shares outstanding		0	0
Percentage of the common OP units		99.00%
Common OP units, outstanding		734,500,000	739,900,000
Common stock repurchase, shares		38,300,000
Common stock repurchase, average price per share		$ 17.64
Common stock repurchase, value		$ 675
Stock Repurchase Program capacity		$ 325
HOST HOTELS & RESORTS, INC. | Subsequent Event
Stockholders Equity Note [Line Items]
Dividend declaration date	Feb. 29, 2016
Dividend per share, declared	$ 0.20
Dividend payable date	Apr. 15, 2016
Dividend record date	Mar. 31, 2015
HOST HOTELS & RESORTS, INC. | Upper Limit
Stockholders Equity Note [Line Items]
Common stock repurchase, authorized amount					$ 500	$ 500
HOST HOTELS & RESORTS L.P.
Stockholders Equity Note [Line Items]
Percentage of the common OP units		99.00%
Shares issuable upon conversion of one OP unit		1.021494
Common OP units, outstanding		743,700,000	749,100,000
Exchangeable senior debentures, exchanged		$ 399
Debt converted into shares of Host Inc. common stock		32,000,000
HOST HOTELS & RESORTS L.P. | Limited Partner
Stockholders Equity Note [Line Items]
Percentage of the common OP Units		1.00%
Common stock repurchase, value		$ 675