Net Income (Loss) Attributable to Host Inc. (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
NET INCOME ATTRIBUTABLE TO REPORTING ENTITY	$ 732	$ 317	$ 61
HOST HOTELS & RESORTS, INC.
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Continuing operations, net of tax		203	(10)
Discontinued operations, net of tax		114	71
NET INCOME ATTRIBUTABLE TO REPORTING ENTITY		$ 317	$ 61	$ 254	$ 144	$ 155	$ 179	$ 123	$ 19	$ 119	$ 56