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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, 2024 USD ($) $ / shares shares	Dec. 31, 2023 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	$ 17.52	$ 19.47
Book value (millions)	$ 165	$ 189
HOST HOTELS & RESORTS L.P.
Shares Subject to Mandatory Redemption by Settlement Terms [Line Items]
Common OP units outstanding (millions) (in shares) | shares	693.6	698.3
Shares issuable upon conversion of one common OP unit	1.021494	1.021494
Book value (millions)	$ 165	$ 189
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	9.2	9.5
Redemption value (millions)	$ 165	$ 189
Historical cost (millions)	90	93
Book value (millions)	$ 165	$ 189

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+ 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Subparagraph (16)(c)
-Paragraph 3A
-Section S99
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3A
-Subparagraph (15)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-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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