Earnings (Loss) Per Common Share Or Unit (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share Diluted [Line Items]
Net income (loss)	$ (11)	$ (741)	$ 932
Less: Net (income) loss attributable to non-controlling interests	0	9	(12)
Net income (loss) attributable to Host Hotels & Resorts, Inc.	$ (11)	$ (732)	$ 920
Basic weighted average shares outstanding	710.3	705.9	730.3
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market			0.8
Diluted weighted average shares/units outstanding	710.3	705.9	731.1
Basic earnings (loss) per common share	$ (0.02)	$ (1.04)	$ 1.26
Diluted earnings (loss) per common share	$ (0.02)	$ (1.04)	$ 1.26
HOST HOTELS & RESORTS L.P.
Earnings Per Share Diluted [Line Items]
Net income (loss)	$ (11)	$ (741)	$ 932
Less: Net (income) loss attributable to non-controlling interests	(1)	1	(2)
Net income (loss) attributable to Host Hotels & Resorts, Inc.	$ (12)	$ (740)	$ 930
Basic weighted average shares outstanding	702.5	698.4	722.5
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market			0.8
Diluted weighted average shares/units outstanding	702.5	698.4	723.3
Basic earnings (loss) per common share	$ (0.02)	$ (1.06)	$ 1.29
Diluted earnings (loss) per common share	$ (0.02)	$ (1.06)	$ 1.29