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Historical Cost and Redemption Values for Non-Controlling Interests (Detail)
$ / shares in Units, shares in Millions, $ in Millions
Sep. 30, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Book value (millions) $ 165 $ 126
HOST HOTELS & RESORTS L.P.    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Common OP units outstanding (millions) | shares 10.1 7.1
Market price per Host Inc. common share | $ / shares $ 15.88 $ 17.39
Shares issuable upon conversion of one common OP unit 1.021494 1.021494
Redemption value (millions) $ 165 $ 126
Historical cost (millions) 100 66
Book value (millions) [1] $ 165 $ 126
[1] The book value recorded is equal to the greater of redemption value or historical cost.