Equity of Host Inc. and Capital of Host L.P. - Components of Equity (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Stockholders Equity Note [Line Items]
Beginning Balance	$ 6,863	$ 6,715	$ 6,525	$ 6,715	$ 6,446
Net Income (Loss)	210		256	497	372
Issuance of common stock for comprehensive stock plans, net	8		12	4	3
Repurchase of common stock				(50)
Dividends declared on common stock	(107)		(43)	(194)	(65)
Distributions to non-controlling interests	(1)			(1)
Changes in ownership and other			38		24
Other comprehensive income/(loss)	3		(5)	5	2
Ending Balance	6,977	6,863	6,782	6,977	6,782
Common Stock
Stockholders Equity Note [Line Items]
Beginning Balance	7	7	7	7	7
Ending Balance	7	7	7	7	7
Additional Paid-in Capital
Stockholders Equity Note [Line Items]
Beginning Balance	7,663	7,717	7,680	7,717	7,702
Issuance of common stock for comprehensive stock plans, net	8		12	4	3
Repurchase of common stock				(50)
Changes in ownership and other			37		24
Ending Balance	7,671	7,663	7,729	7,671	7,729
Accumulated Other Comprehensive Income (Loss)
Stockholders Equity Note [Line Items]
Beginning Balance	(73)	(75)	(69)	(75)	(76)
Other comprehensive income/(loss)	3		(5)	5	2
Ending Balance	(70)	(73)	(74)	(70)	(74)
Retained Earnings / (Deficit)
Stockholders Equity Note [Line Items]
Beginning Balance	(739)	(939)	(1,098)	(939)	(1,192)
Net Income (Loss)	210		256	497	372
Dividends declared on common stock	(107)		(43)	(194)	(65)
Ending Balance	(636)	(739)	(885)	(636)	(885)
Non-redeemable, non-controlling interests
Stockholders Equity Note [Line Items]
Beginning Balance	5	5	5	5	5
Net Income (Loss)	1		(1)	1
Distributions to non-controlling interests	(1)			(1)
Changes in ownership and other			1
Ending Balance	5	5	5	5	5
Redeemable, non-controlling interests
Stockholders Equity Note [Line Items]
Beginning Balance	167	164	203	164	126
Net Income (Loss)	3		5	7	6
Issuance of common OP units					56
Distributions to non-controlling interests	(2)		(1)	(3)	(1)
Changes in ownership and other			(44)		(24)
Ending Balance	168	$ 167	163	168	163
Total Equity of HST
Stockholders Equity Note [Line Items]
Net Income (Loss)	$ 211		$ 255	$ 498	$ 372