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Equity of Host Inc. and Capital of Host L.P. - Additional Information (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Dec. 31, 2024
Stockholders Equity Note [Line Items]          
Share repurchase program, shares repurchased (in shares) | shares 0   13,100,000    
Shares repurchased, average price (in dollars per share) | $ / shares     $ 15.68    
Repurchase of common stock   $ 57 $ 205 $ 107  
Amount available for repurchase $ 480   480    
Stock issuance remaining capacity $ 600   $ 600    
Dividend declared (in dollars per share) | $ / shares $ 0.20        
Common Stock | Equity Distribution Program          
Stockholders Equity Note [Line Items]          
Shares issued (in shares) | shares     0    
HOST HOTELS & RESORTS L.P.          
Stockholders Equity Note [Line Items]          
Shares issuable upon conversion of one common OP unit (in shares) 1.021494   1.021494   1.021494
Repurchase of common stock   $ 57 $ 205 $ 107  
Distribution per share (in dollars per unit) | $ / shares $ 0.2042988   $ 0.2042988    
Host L.P.          
Stockholders Equity Note [Line Items]          
Percentage of the common OP units 99.00%   99.00%