Equity of Host Inc. and Capital of Host L.P. - Additional Information (Detail) shares in Millions, $ in Millions	9 Months Ended
Sep. 30, 2020 USD ($) shares	Dec. 31, 2019
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, INC.
Stockholders Equity Note [Line Items]
Share repurchase program, shares repurchased \| shares	0
Stock Repurchase Program, Authorized Amount \| $	$ 371

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration