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Non-controlling Interests - Summary of Historical Cost and Redemption Values for Non-Controlling Interests (Detail) $ / shares in Units, shares in Millions, $ in Millions		Sep. 30, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Market price per Host Inc. common share (in dollars per share) | $ / shares		$ 17.60	$ 19.47
Book value (millions)		$ 167	$ 189
HOST HOTELS & RESORTS L.P.
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Shares issuable upon conversion of one common OP unit (in shares)		1.021494	1.021494
Redemption value (millions)		$ 167	$ 189
Historical cost (millions)		92	93
Book value (millions)	[1]	$ 167	$ 189
HOST HOTELS & RESORTS L.P. | Redeemable Non Controlling Interests
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Common OP units outstanding (millions) (in shares) | shares		9.3	9.5
[1] The book value recorded is equal to the greater of redemption value or historical cost.

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Common stock issuable upon conversion of one operating unit.

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Historical cost of redeemable non-controlling interest.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

+ References

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
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

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-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section S99
-Paragraph 3A
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 3A
-Subparagraph (14)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

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Redemption value, as if currently redeemable, of redeemable noncontrolling interest classified as temporary equity and the election has been made to accrete changes in redemption value to the earliest redemption date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3A
-Subparagraph (24)(b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
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-Name Accounting Standards Codification
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