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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.