Equity of Host Inc. and Capital of Host L.P. - Components of Capital (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Limited Partners Capital Account [Line Items]
Net income	$ 111	$ 114	$ 608	$ 486
Net income loss	111	115	609	487
Repurchase of common OP units	(100)		(150)
Distributions to non-controlling interests		(1)	(1)	(1)
Other comprehensive income	(3)	(3)	2	(1)
HOST HOTELS & RESORTS L.P.
Limited Partners Capital Account [Line Items]
Beginning Balance	6,977	6,782	6,715	6,446
Net income	113	115	617	493
Net income loss	111	115	609	487
Issuance of common OP units to Host Inc. for comprehensive stock plans, net	5	10	9	13
Repurchase of common OP units	(100)		(150)
Distributions declared on common OP units	(127)	(85)	(321)	(150)
Distributions to non-controlling interests			(1)	(1)
Changes in ownership and other	11	(1)	11	23
Other comprehensive income	(3)	(3)	2	(1)
Ending Balance	6,874	6,817	6,874	6,817
HOST HOTELS & RESORTS L.P. | General Partner
Limited Partners Capital Account [Line Items]
Beginning Balance	1	1	1	1
Ending Balance	1	1	1	1
HOST HOTELS & RESORTS L.P. | Limited Partner
Limited Partners Capital Account [Line Items]
Beginning Balance	7,041	6,850	6,784	6,516
Net income	111	114	608	486
Issuance of common OP units to Host Inc. for comprehensive stock plans, net	5	10	9	13
Repurchase of common OP units	(100)		(150)
Distributions declared on common OP units	(127)	(85)	(321)	(150)
Changes in ownership and other	12	(1)	12	23
Ending Balance	6,942	6,888	6,942	6,888
HOST HOTELS & RESORTS L.P. | Accumulated Other Comprehensive Income (Loss)
Limited Partners Capital Account [Line Items]
Beginning Balance	(70)	(74)	(75)	(76)
Other comprehensive income	(3)	(3)	2	(1)
Ending Balance	(73)	(77)	(73)	(77)
HOST HOTELS & RESORTS L.P. | Non-controlling Interests
Limited Partners Capital Account [Line Items]
Beginning Balance	5	5	5	5
Net income		1	1	1
Distributions to non-controlling interests		(1)	(1)	(1)
Changes in ownership and other	(1)		(1)
Ending Balance	4	5	4	5
HOST HOTELS & RESORTS L.P. | Limited partnership interests of third parties
Limited Partners Capital Account [Line Items]
Beginning Balance	168	163	164	126
Net income	2	1	9	7
Distributions declared on common OP units	(1)	(1)	(4)	(2)
Issuance of common OP units				56
Changes in ownership and other	(12)	2	(12)	(22)
Ending Balance	$ 157	$ 165	$ 157	$ 165