Equity of Host Inc. and Capital of Host L.P. - Additional Information (Detail) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended	6 Months Ended
	May 06, 2021 USD ($)	Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020
Stockholders Equity Note [Line Items]
Net proceeds			$ 138
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 during the covenant relief period, unless a higher amount is required 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. The amendment currently expires following the second quarter of 2022, although we are permitted to terminate the covenant relief period at any time, subject to demonstrating satisfaction of the financial maintenance covenants that otherwise would apply for the quarter ending June 30, 2022.
Maximum allowable dividend per share covenant waiver period | $ / shares			$ 0.01
At-the-Market Offering
Stockholders Equity Note [Line Items]
Common stock issuable aggregate value	$ 600
Share issued | shares		7.8
Average price per share | $ / shares		$ 17.99	$ 17.99
Net proceeds		$ 138
Stock issuance remaining capacity		$ 460	$ 460
Host L.P.
Stockholders Equity Note [Line Items]
Percentage of the common OP units		99.00%	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	1.021494
HOST HOTELS & RESORTS L.P. | At-the-Market Offering
Stockholders Equity Note [Line Items]
Units issued | shares			7.6
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	7.25
HOST HOTELS & RESORTS, INC.
Stockholders Equity Note [Line Items]
Share repurchase program, shares repurchased | shares			0.0
Stock Repurchase Program, Authorized Amount		$ 371	$ 371