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Host Inc. Earnings (Loss) Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
NET INCOME $ 105 $ 108 $ 478 $ 643
Less: Net (income) loss attributable to non-controlling interests (1) (1) (6) (7)
NET INCOME ATTRIBUTABLE TO REPORTING ENTITY $ 104 $ 107 $ 472 $ 636
Basic weighted average shares outstanding 738.8 740.6 738.5 744.8
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market 0.2 0.5 0.2 0.4
Diluted weighted average shares/units outstanding 739.0 741.1 738.7 745.2
Basic earnings per common share $ 0.14 $ 0.14 $ 0.64 $ 0.85
Diluted earnings per common share $ 0.14 $ 0.14 $ 0.64 $ 0.85