Host LP Earnings (Loss) Per Common Unit (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Earnings Per Share Diluted [Line Items]
NET INCOME																	$ 747		$ 325		$ 63
Less: Net income attributable to non-controlling interests																	(15)		(8)		(2)
NET INCOME ATTRIBUTABLE TO REPORTING ENTITY																	732		317		61
Diluted income attributable to Host Inc.																	759		317		61
Basic weighted average shares outstanding																	755.4		744.4		718.2
Assuming weighted average shares for conversion of exchangeable senior debentures																	30.3		2.4
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market																	1.1		1.1		1.4
Diluted weighted average shares outstanding																	786.8	[1]	747.9	[1]	719.6	[1]
Basic earnings per common share/unit																	$ 0.97		$ 0.43		$ 0.08
Diluted earnings per common share																	$ 0.96		$ 0.42		$ 0.08
HOST HOTELS & RESORTS L.P.
Earnings Per Share Diluted [Line Items]
NET INCOME																	747		325		63
Less: Net income attributable to non-controlling interests																	(6)		(4)		(1)
NET INCOME ATTRIBUTABLE TO REPORTING ENTITY	257	[2]	146	[2]	157	[2]	181	[2]	125	[2]	19	[2]	120	[2]	57	[2]	741		321		62
Assuming conversion of exchangeable senior debentures																	27		1
Diluted income attributable to Host Inc.																	$ 768		$ 322		$ 62
Basic weighted average shares outstanding																	748.9		738.4		713.3
Assuming weighted average shares for conversion of exchangeable senior debentures																	29.7		2.4
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market																	1.0		1.1		1.3
Diluted weighted average shares outstanding																	779.6	[3]	741.9	[3]	714.6	[3]
Basic earnings per common share/unit	$ 0.34	[2]	$ 0.19	[2]	$ 0.21	[2]	$ 0.24	[2]	$ 0.17	[2]	$ 0.03	[2]	$ 0.16	[2]	$ 0.08	[2]	$ 0.99		$ 0.43		$ 0.09
Diluted earnings per common share	$ 0.34	[2]	$ 0.19	[2]	$ 0.21	[2]	$ 0.24	[2]	$ 0.17	[2]	$ 0.03	[2]	$ 0.16	[2]	$ 0.08	[2]	$ 0.99		$ 0.43		$ 0.09

[1] There were approximately 30 million and 40 million potentially dilutive shares as of December 31, 2013 and 2012, respectively, 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.

[2] Other income statement line items not presented for Host L.P. are equal to the amounts presented for Host Inc.

[3] There were approximately 29 million and 40 million potentially dilutive units as of December 31, 2013 and 2012, respectively, related to our exchangeable senior debentures, which units were not included in the computation of diluted earnings per unit because to do so would have been anti-dilutive for the period.