Equity of Host Inc. and Capital of Host L.P. - Components of Capital (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Limited Partners Capital Account [Line Items]
Net income loss	$ 116	$ (152)
Net income loss	117	(152)
Other comprehensive income/(loss)	7	(3)
Accumulated Other Comprehensive Income (Loss)
Limited Partners Capital Account [Line Items]
Other comprehensive income/(loss)	7	(3)
Non-redeemable, non-controlling interests
Limited Partners Capital Account [Line Items]
Net income loss	1
HOST HOTELS & RESORTS L.P.
Limited Partners Capital Account [Line Items]
Beginning Balance	6,446	6,326
Net income loss	117	(153)
Net income loss	117	(152)
Partners' Capital Account, Unit-based Payment Arrangement, Amount	(9)	(4)
Distributions declared on common OP units	(22)
Changes in ownership and other	(14)	(17)
Other comprehensive income/(loss)	7	(3)
Ending Balance	6,525	6,150
HOST HOTELS & RESORTS L.P. | General Partner
Limited Partners Capital Account [Line Items]
Beginning Balance	1	1
Ending Balance	1	1
HOST HOTELS & RESORTS L.P. | Limited Partner
Limited Partners Capital Account [Line Items]
Beginning Balance	6,516	6,394
Net income loss	116	(152)
Partners' Capital Account, Unit-based Payment Arrangement, Amount	(9)	(4)
Distributions declared on common OP units	(22)
Changes in ownership and other	(13)	(17)
Ending Balance	6,588	6,221
HOST HOTELS & RESORTS L.P. | Accumulated Other Comprehensive Income (Loss)
Limited Partners Capital Account [Line Items]
Beginning Balance	(76)	(74)
Other comprehensive income/(loss)	7	(3)
Ending Balance	(69)	(77)
HOST HOTELS & RESORTS L.P. | Non-redeemable, non-controlling interests
Limited Partners Capital Account [Line Items]
Beginning Balance	5	5
Net income loss	1
Changes in ownership and other	(1)
Ending Balance	5	5
HOST HOTELS & RESORTS L.P. | Limited partnership interests of third parties
Limited Partners Capital Account [Line Items]
Beginning Balance	126	108
Net income loss	1	(1)
Common OP unit issuances	56
Changes in ownership and other	20	17
Ending Balance	$ 203	$ 124