Equity of Host Inc. and Capital of Host L.P. - Additional Information (Detail) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020
Stockholders Equity Note [Line Items]
Line of credit facility dividend restrictions	based on the terms of the credit facility amendments, we are restricted from paying a quarterly common cash dividend in excess of $0.01 per share, unless necessary to allow Host Inc. to maintain its REIT status or to avoid the payment of corporate income or excise taxes, until after the covenant waiver period expires following the second quarter of 2022
Maximum allowable dividend per share covenant waiver period | $ / shares	$ 0.01
Host L.P.
Stockholders Equity Note [Line Items]
Percentage of the common OP units	99.00%
HOST HOTELS & RESORTS L.P.
Stockholders Equity Note [Line Items]
Shares issuable upon conversion of one common OP unit	1.021494	1.021494
HOST HOTELS & RESORTS L.P. | Line Of Credit [Member] | Maximum
Stockholders Equity Note [Line Items]
Leverage ratio as calculated under the credit facility	7.25
HOST HOTELS & RESORTS, INC.
Stockholders Equity Note [Line Items]
Share repurchase program, shares repurchased | shares	0
Stock Repurchase Program, Authorized Amount | $	$ 371