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Non-controlling Interests - Summary of Historical Cost and Redemption Values for Non-Controlling Interests (Details) $ / shares in Units, shares in Millions, $ in Millions | Sep. 30, 2025 USD ($) $ / shares shares | Dec. 31, 2024 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 |  | $ 17.02 | $ 17.52
Book value (millions) |  | $ 149 | $ 165
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) |  | $ 149 | $ 165
Historical cost (millions) |  | 86 | 90
Book value (millions) | [1] | $ 149 | $ 165
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 |  | 8.6 | 9.2
[1] | The book value recorded is equal to the greater of redemption value or historical cost.

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- Definition 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://www.xbrl.org/2003/role/disclosureRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479887/480-10-S45-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479857/480-10-S50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479887/480-10-S45-3 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3A -Subparagraph (24) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 480 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (01)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480244/480-10-S99-1 + Details
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