Earnings (Loss) Per Common Share (Unit) - Additional Information (Detail) - HOST HOTELS & RESORTS, INC. shares in Millions	Mar. 31, 2022 shares
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]
Common units outstanding	10.2
Number of common shares that would be outstanding if OP units were converted	10.4

The number of units or equivalent units outstanding for all classes.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB TOPIC 4.F)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant