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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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