Equity of Host Inc. and Capital of Host L.P. - Additional Information (Detail) $ / shares in Units, $ in Millions			12 Months Ended
	Feb. 19, 2020 $ / shares	Jan. 01, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2017 $ / shares	Aug. 05, 2019 USD ($)	May 31, 2018 USD ($)	Feb. 28, 2017 USD ($)
Stockholders Equity Note [Line Items]
Common stock, shares authorized			1,050,000,000	1,050,000,000
Common stock, par value | $ / shares			$ 0.01	$ 0.01
Common stock, shares outstanding			713,400,000	740,400,000
Dividend policy			The amount of any future dividends will be determined by Host Inc.’s Board of Directors.
Dividends taxable as REIT qualified			63.40%	99.70%
Dividends taxable as ordinary income			33.70%
Dividends taxable as unrecaptured Section 1250 gain			2.50%	0.30%
Dividend taxable as long term capital gain			0.40%
Dividends taxable as ordinary income deduction section 199A			20.00%	20.00%
Dividend per share, declared | $ / shares			$ 0.85	$ 0.85	$ 0.85
Lower Limit
Stockholders Equity Note [Line Items]
Percentage of annual taxable income Host Inc is required to distribute			90.00%
Host L.P.
Stockholders Equity Note [Line Items]
Investment ownership percentage			99.00%
Percentage of the common OP Units			1.00%
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 | $ / shares			$ 0.01	$ 0.01
Common stock, shares outstanding			713,400,000	740,400,000
Preferred stock, shares authorized			50,000,000	50,000,000
Preferred stock, no par value | $ / shares
Preferred stock, shares outstanding			0	0
Common OP units, outstanding			698,300,000	724,800,000
Common stock repurchase, authorized amount | $						$ 1,000	$ 500
Available shares for repurchase | $			$ 391
Shares repurchased, average price | $ / shares			$ 17.37
Shares repurchased			27,800,000	0
Repurchase of common stock, amount | $			$ 482
Common stock sold, shares			0	0
Dividend declaration date	Feb. 19, 2020
Dividend per share, declared | $ / shares	$ 0.20
Dividend payable date	Apr. 15, 2020
Dividend record date	Mar. 31, 2020
HOST HOTELS & RESORTS, INC. | Subsequent Event
Stockholders Equity Note [Line Items]
Shares repurchased, average price | $ / shares		$ 16.90
Shares repurchased		7,500,000
Repurchase of common stock, amount | $		$ 127
HOST HOTELS & RESORTS, INC. | Maximum [Member]
Stockholders Equity Note [Line Items]
Combined aggregate offering price of common stock | $							$ 500
Common stock repurchase, authorized amount | $								$ 500
HOST HOTELS & RESORTS L.P.
Stockholders Equity Note [Line Items]
Shares issuable upon conversion of one OP unit			1.021494	1.021494	1.021494
Common OP units, outstanding			705,800,000	732,400,000