Host Inc. Earnings (Loss) Per Common Share (Detail) (HOST HOTELS & RESORTS, INC., USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 07, 2012		Sep. 07, 2012		Sep. 30, 2013
HOST HOTELS & RESORTS, INC.
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Line Items]
NET INCOME (LOSS)	$ 18		$ (36)		$ 48		$ 199
Less: Net (income) loss attributable to non-controlling interests	1		2		(2)		(5)
Net income (loss) attributable to Host Inc.	19		(34)		46		194
Diluted income (loss) attributable to Host Inc.	$ 19		$ (34)		$ 46		$ 194
Basic weighted average shares outstanding	749.0		721.3		715.7		740.9
Diluted weighted average shares outstanding	749.7	[1]	721.3	[1]	715.7	[1]	744.9	[1]
Basic earnings (loss) per common share	$ 0.03		$ (0.05)		$ 0.06		$ 0.26
Diluted earnings (loss) per common share	$ 0.03		$ (0.05)		$ 0.06		$ 0.26

[1] There were approximately 30 million and 29 million for the quarter and year-to-date periods ended September 30, 2013, respectively, and approximately 40 million for both the quarter and year-to-date periods ended September 7, 2012, potentially dilutive shares for our exchangeable senior debentures, which shares were not included in the computation of diluted earnings (loss) per share because to do so would have been anti-dilutive for the period.