Host LP Earnings (Loss) Per Common Unit (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share Diluted [Line Items]
NET INCOME	$ 189	$ 256
Less: Net income attributable to non-controlling interests	(3)	(3)
NET INCOME ATTRIBUTABLE TO REPORTING ENTITY	$ 186	$ 253
Basic weighted average shares outstanding	740.6	739.2
Assuming distribution of common units to support shares granted under the comprehensive stock plans, less shares assumed purchased at market	0.2	0.4
Diluted weighted average shares/units outstanding	740.8	739.6
Basic earnings per common share	$ 0.25	$ 0.34
Diluted earnings per common share	$ 0.25	$ 0.34
HOST HOTELS & RESORTS L.P.
Earnings Per Share Diluted [Line Items]
NET INCOME	$ 189	$ 256
Less: Net income attributable to non-controlling interests	(1)
NET INCOME ATTRIBUTABLE TO REPORTING ENTITY	$ 188	$ 256
Basic weighted average shares outstanding	732.5	731.9
Assuming distribution of common units to support shares granted under the comprehensive stock plans, less shares assumed purchased at market	0.2	0.3
Diluted weighted average shares/units outstanding	732.7	732.2
Basic earnings per common share	$ 0.26	$ 0.35
Diluted earnings per common share	$ 0.26	$ 0.35