Host Inc. Earnings Per Common Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Line Items]
Net income	$ 185		$ 60
Less: Net income attributable to non-controlling interests	(6)		(4)
Net income attributable to Host Inc.	179		56
Assuming conversion of exchangeable senior debentures	7		0
Diluted income attributable to Host Inc.	$ 186		$ 56
Basic weighted average shares outstanding	754.9		728.2
Assuming weighted average shares for conversion of exchangeable senior debentures	29.9		9.9
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market	0.3		0.5
Diluted weighted average shares outstanding	785.1	[1]	738.6	[1]
Basic earnings per common share	$ 0.24		$ 0.08
Diluted earnings per common share	$ 0.24		$ 0.08

[1] There were approximately 29 million potentially dilutive shares for the quarter ended March 31, 2013, 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.