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Non-Controlling Interests - Additional Information (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Entity
Dec. 31, 2020
USD ($)
Minority Interest [Line Items]    
Number of majority-owned partnerships that have third-party, non-controlling ownership interests that have been consolidated | Entity 2  
Non-redeemable non-controlling interests - other consolidated partnerships | $ $ 5 $ 5
HOST HOTELS & RESORTS L.P.    
Minority Interest [Line Items]    
OP units conversion basis One common OP unit may be exchanged for 1.021494 shares of Host Inc  
Shares issuable upon conversion of one OP unit 1.021494 1.021494