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Summary of Significant Accounting Policies - Historical Cost and Redemption Values for Non-Controlling Interests (Detail) $ / shares in Units, shares in Millions, $ in Millions	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares
Shares Subject to Mandatory Redemption by Settlement Terms [Line Items]
Market price per Host Inc. common share (in dollars per share) | $ / shares	$ 19.47	$ 16.05
Book value (millions)	$ 189	$ 164
HOST HOTELS & RESORTS L.P.
Shares Subject to Mandatory Redemption by Settlement Terms [Line Items]
Common OP units outstanding (millions) (in shares) | shares	698.3	708.4
Shares issuable upon conversion of one common OP unit (in shares)	1.021494	1.021494
Book value (millions)	$ 189	$ 164
HOST HOTELS & RESORTS L.P. | Redeemable Non Controlling Interests
Shares Subject to Mandatory Redemption by Settlement Terms [Line Items]
Common OP units outstanding (millions) (in shares) | shares	9.5	10.0
Redemption value (millions)	$ 189	$ 164
Historical cost (millions)	93	97
Book value (millions)	$ 189	$ 164

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Subparagraph (12)(c)
-Section S99
-Paragraph 3A
-Publisher FASB
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-Topic 480
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