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Earnings Per Common Share (Unit) - Summary of Host Inc. (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income $ 163 $ 84 $ 639 $ 598
Less: Net income attributable to non-controlling interests (2) (2) (9) (9)
NET INCOME ATTRIBUTABLE TO HOST HOTELS & RESORTS, INC. $ 161 $ 82 $ 630 $ 589
Basic weighted average shares outstanding (in shares) 687.5 700.9 692.6 703.1
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market (in shares) 2.0 1.5 1.9 1.6
Diluted weighted average shares outstanding (in shares) 689.5 702.4 694.5 704.7
Basic earnings per common share (in dollars per share) $ 0.23 $ 0.12 $ 0.91 $ 0.84
Diluted earnings per common share (in dollars per share) $ 0.23 $ 0.12 $ 0.91 $ 0.84