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						4 Months Ended		12 Months Ended
	Sep. 07, 2012	Jun. 15, 2012	Mar. 23, 2012	Sep. 09, 2011	Jun. 17, 2011	Mar. 25, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
HOST HOTELS & RESORTS, INC.
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Net income (loss)	$ (36)	$ 83		$ (35)	$ 64	$ (60)	$ 15	$ 16	$ 63		$ (16)		$ (132)
Less: Net (income) loss attributable to non-controlling interests									(2)		1		2
NET INCOME (LOSS) ATTRIBUTABLE TO REPORTING ENTITY	(34)	82	(2)	(33)	62	(60)	15	17	61		(15)		(130)
Less: Dividends on preferred stock													(4)
Issuance costs of redeemed preferred stock													(4)	[1]
Net income (loss) available to common stockholders	(34)	82	(2)	(33)	62	(60)	15	17	61		(15)		(138)
Diluted income (loss) available to common shareholders									$ 61		$ (15)		$ (138)
Basic weighted average shares outstanding									718.2		693.0		656.1
Diluted weighted average shares outstanding									719.6	[2]	693.0	[2]	656.1	[2]
Basic earnings (loss) per common share	$ (0.05)	$ 0.11		$ (0.05)	$ 0.09	$ (0.09)	$ 0.02	$ 0.02	$ 0.08		$ (0.02)		$ (0.21)
Diluted earnings (loss) per common share	$ (0.05)	$ 0.11		$ (0.05)	$ 0.09	$ (0.09)	$ 0.02	$ 0.02	$ 0.08		$ (0.02)		$ (0.21)

[1] Represents the original issuance costs associated with the Class E preferred stock, which stock was redeemed during 2010.

[2] There are 40 million, 47 million and 53 million potentially dilutive shares for our exchangeable senior debentures and shares granted under comprehensive stock plans which were not included in the computation of diluted EPS as of December 31, 2012, 2011 and 2010, respectively, because to do so would have been anti-dilutive for the period.