Host LP Earnings (Loss) Per Common Unit (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share Diluted [Line Items]
NET INCOME (LOSS)	$ (316)	$ 372	$ (675)	$ 851
Less: Net (income) loss attributable to non-controlling interests	3	(4)	7	(11)
NET INCOME (LOSS) ATTRIBUTABLE TO HOST HOTELS & RESORTS, INC.	$ (313)	$ 368	$ (668)	$ 840
Basic weighted average shares outstanding	705.2	725.5	706.1	735.0
Assuming distribution of common units to support shares granted under the comprehensive stock plans, less shares assumed purchased at market		0.3		0.4
Diluted weighted average shares/units outstanding	705.2	725.8	706.1	735.4
Basic earnings (loss) per common share	$ (0.44)	$ 0.51	$ (0.95)	$ 1.14
Diluted earnings (loss) per common share	$ (0.44)	$ 0.51	$ (0.95)	$ 1.14
HOST HOTELS & RESORTS L.P.
Earnings Per Share Diluted [Line Items]
NET INCOME (LOSS)	$ (316)	$ 372	$ (675)	$ 851
Less: Net (income) loss attributable to non-controlling interests	(1)			(2)
NET INCOME (LOSS) ATTRIBUTABLE TO HOST HOTELS & RESORTS, INC.	$ (317)	$ 372	$ (675)	$ 849
Basic weighted average shares outstanding	697.6	717.8	698.6	727.1
Assuming distribution of common units to support shares granted under the comprehensive stock plans, less shares assumed purchased at market		0.3		0.4
Diluted weighted average shares/units outstanding	697.6	718.1	698.6	727.5
Basic earnings (loss) per common share	$ (0.45)	$ 0.52	$ (0.97)	$ 1.17
Diluted earnings (loss) per common share	$ (0.45)	$ 0.52	$ (0.97)	$ 1.17