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Host LP Earnings (Loss) Per Common Unit (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share Diluted [Line Items]    
NET LOSS $ (153) $ (3)
Less: Net loss attributable to non-controlling interests 1  
NET LOSS ATTRIBUTABLE TO HOST HOTELS & RESORTS, INC. $ (152) $ (3)
Basic weighted average shares outstanding 705.6 708.1
Diluted weighted average shares/units outstanding 705.6 708.1
Basic loss per common share $ (0.22)  
Diluted loss per common share $ (0.22)  
HOST HOTELS & RESORTS L.P.    
Earnings Per Share Diluted [Line Items]    
NET LOSS $ (153) $ (3)
NET LOSS ATTRIBUTABLE TO HOST HOTELS & RESORTS, INC. $ (153) $ (3)
Basic weighted average shares outstanding 698.0 700.7
Diluted weighted average shares/units outstanding 698.0 700.7
Basic loss per common share $ (0.22)  
Diluted loss per common share $ (0.22)