Host Inc. Earnings (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
NET INCOME		$ 571	$ 747	$ 325
Less: Net income attributable to non-controlling interests		(13)	(15)	(8)
NET INCOME ATTRIBUTABLE TO REPORTING ENTITY		558	732	317
Assuming conversion of exchangeable senior debentures			27
Diluted income attributable to Host Inc.		$ 558	$ 759	$ 317
Basic weighted average shares outstanding		752.4	755.4	744.4
Assuming weighted average shares for conversion of exchangeable senior debentures			30.3	2.4
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market		0.5	1.1	1.1
Diluted weighted average shares outstanding	[1]	752.9	786.8	747.9
Basic earnings per common share		$ 0.74	$ 0.97	$ 0.43
Diluted earnings per common share		$ 0.74	$ 0.96	$ 0.42

[1] There were approximately 25 million and 30 million potentially dilutive shares as of December 31, 2015 and 2013, respectively, related to our exchangeable senior debentures, which shares were not included in the computation of diluted earnings per share because to do so would have been anti-dilutive for the period.