Host Inc. Earnings (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
NET INCOME		$ 351	$ 214	$ 535	$ 313
Less: Net income attributable to non-controlling interests		(4)	(2)	(6)	(3)
NET INCOME ATTRIBUTABLE TO REPORTING ENTITY		347	212	529	310
Assuming conversion of exchangeable senior debentures			7
Diluted income attributable to Host Inc.		$ 347	$ 219	$ 529	$ 310
Basic weighted average shares outstanding		744.0	753.9	746.8	755.0
Assuming weighted average shares for conversion of exchangeable senior debentures			31.2
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market		0.3	0.4	0.3	0.4
Diluted weighted average shares/units outstanding	[1]	744.3	785.5	747.1	755.4
Basic earnings per common share		$ 0.47	$ 0.28	$ 0.71	$ 0.41
Diluted earnings per common share		$ 0.47	$ 0.28	$ 0.71	$ 0.41

[1] There were approximately 31 million potentially dilutive shares for the year-to-date period ended June 30, 2015 related to our exchangeable senior debentures, which were anti-dilutive for the period. The exchangeable senior debentures were redeemed in 2015 in exchange for 32 million shares.