Equity of Host Inc. and Capital of Host L.P. - Additional Information (Detail)			12 Months Ended
	Feb. 16, 2022 $ / shares	May 06, 2021 USD ($)	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares	Aug. 05, 2019 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			714,100,000	705,400,000
Dividend policy			The amount of any future dividends will be determined by Host Inc.’s Board of Directors.
Issuance of common stock | $			$ 138,000,000	$ 0	$ 0
Stock issuance remaining capacity | $			$ 460,000,000
Dividends taxable as REIT qualified				5.90%
Dividends taxable as ordinary income				3.60%
Dividends taxable as unrecaptured Section 1250 gain				46.60%
Dividend taxable as long term capital gain				43.90%
Dividends taxable as ordinary income deduction section 199A				20.00%
Cash dividend | $ / shares	$ 0.03		$ 0	$ 0.20	$ 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			714,100,000	705,400,000
Preferred stock, shares authorized			50,000,000	50,000,000
Preferred stock, no par value | $ / shares			$ 0	$ 0
Preferred stock, shares outstanding			0	0
Common OP units, outstanding			699,000,000.0	690,500,000
Available shares for repurchase | $			$ 371,000,000
Shares repurchased, average price | $ / shares				$ 16.49
Shares repurchased			0	8,900,000
Repurchase of common stock, amount | $				$ 147,000,000
Common stock issuances (shares)			7,800,000
Shares Issued Price Per Share | $ / shares			$ 17.99
Issuance of common stock | $			$ 138,000,000
HOST HOTELS & RESORTS, INC. | Lower Limit
Stockholders Equity Note [Line Items]
Common stock repurchase, authorized amount | $							$ 500,000,000
HOST HOTELS & RESORTS, INC. | Maximum
Stockholders Equity Note [Line Items]
Common stock repurchase, authorized amount | $						$ 1,000,000,000	$ 500,000,000
Common stock issuable aggregate value | $		$ 600,000,000
HOST HOTELS & RESORTS L.P.
Stockholders Equity Note [Line Items]
Shares issuable upon conversion of one common OP unit			1.021494	1.021494
Common OP units, outstanding			706,100,000	697,700,000
Common OP unit issuances (units)			7,600,000