Equity of Host Inc. and Capital of Host L.P. - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified		9 Months Ended		1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 07, 2012 Limited Partner	Sep. 07, 2012 HOST HOTELS & RESORTS, INC.	Sep. 09, 2011 HOST HOTELS & RESORTS, INC.	Apr. 24, 2012 HOST HOTELS & RESORTS, INC. 2012 Sales Agency, Financing Agreement	Sep. 07, 2012 HOST HOTELS & RESORTS, INC. 2012 Sales Agency, Financing Agreement	Mar. 23, 2012 HOST HOTELS & RESORTS, INC. 2012 Sales Agency, Financing Agreement	Sep. 07, 2012 HOST HOTELS & RESORTS, INC. 2012 Sales Agency, Financing Agreement	Sep. 07, 2012 HOST HOTELS & RESORTS L.P.	Dec. 31, 2011 HOST HOTELS & RESORTS L.P.
Stockholders Equity Note [Line Items]
Percentage of the common OP Units	1.40%	98.60%
Shares issuable upon conversion of one OP unit	1.021494							1.021494	1.021494
Aggregate common stock offering price value				$ 400	$ 319
Common stock issued, shares					2,100,000	11,100,000	16,300,000
Average price per share for stock issued					$ 15.56		$ 15.67
Common stock issuance		255	289		32		253
Commissions on issuance of common stock					$ 0.3		$ 2.6
Declaration date		Sep. 17, 2012
Dividend per share, declared		$ 0.08
Payment date		Oct. 15, 2012
Record date		Sep. 28, 2012
Common OP units, distribution paid								$ 0.08171952