Earnings Per Common Share (Unit) - Host Inc. (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share [Abstract]
Net income	$ 272	$ 291
Less: Net income attributable to non-controlling interests	(4)	(4)
NET INCOME ATTRIBUTABLE TO HOST HOTELS & RESORTS, INC.	$ 268	$ 287
Basic weighted average shares outstanding (in shares)	704.0	713.4
Assuming distribution of common shares granted under the comprehensive stock plans, less shares assumed purchased at market (in shares)	1.5	1.5
Diluted weighted average shares outstanding (in shares)	705.5	714.9
Basic earnings per common share (in dollars per share)	$ 0.38	$ 0.40
Diluted earnings per common share (in dollars per share)	$ 0.38	$ 0.40