Equity of Host Inc. and Capital of Host L.P. - Components of Capital (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Limited Partners Capital Account [Line Items]
Net income loss	$ 256	$ (60)	$ 372	$ (212)
Net income loss	255	(60)	372	(212)
Dividends declared on common stock	(43)		(65)
Other comprehensive income/(loss)	(5)	6	2	3
Accumulated Other Comprehensive Income (Loss)
Limited Partners Capital Account [Line Items]
Other comprehensive income/(loss)	(5)	6	2	3
Non-redeemable, non-controlling interests
Limited Partners Capital Account [Line Items]
Net income loss	(1)	(0)
HOST HOTELS & RESORTS L.P.
Limited Partners Capital Account [Line Items]
Beginning Balance	6,525	6,150	6,446	6,326
Net income loss	261	(61)	378	(214)
Net income loss	255	(60)	372	(212)
Issuance of common OP units to Host Inc. for comprehensive stock plans, net	12	6	3	(2)
Distributions declared on common OP units	(43)		(65)
Common OP unit issuances		138		138
Changes in ownership and other	38	(3)	24	(20)
Other comprehensive income/(loss)	(5)	6	2	3
Ending Balance	6,782	6,237	6,782	6,237
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	6,588	6,221	6,516	6,394
Net income loss	256	(60)	372	(212)
Issuance of common OP units to Host Inc. for comprehensive stock plans, net	12	6	3	(2)
Distributions declared on common OP units	43		(65)
Common OP unit issuances		138		138
Changes in ownership and other	37	(3)	24	(20)
Ending Balance	6,850	6,302	6,850	6,302
HOST HOTELS & RESORTS L.P. | Accumulated Other Comprehensive Income (Loss)
Limited Partners Capital Account [Line Items]
Beginning Balance	(69)	(77)	(76)	(74)
Other comprehensive income/(loss)	(5)	6	2	3
Ending Balance	(74)	(71)	(74)	(71)
HOST HOTELS & RESORTS L.P. | Non-redeemable, non-controlling interests
Limited Partners Capital Account [Line Items]
Beginning Balance	5	5	5	5
Net income loss	(1)	(0)
Changes in ownership and other	1	0
Ending Balance	5	5	5	5
HOST HOTELS & RESORTS L.P. | Limited partnership interests of third parties
Limited Partners Capital Account [Line Items]
Beginning Balance	203	124	126	108
Net income loss	5	(1)	6	(2)
Distributions declared on common OP units	1		1
Common OP unit issuances			56
Changes in ownership and other	(44)	2	24	19
Ending Balance	$ 163	$ 125	$ 163	$ 125