Components of Capital (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Limited Partners Capital Account [Line Items]
Net loss	$ (60)	$ (352)	$ (212)	$ (355)
Net loss	(60)	(353)	(212)	(356)
Repurchase of common OP units				(147)
Other comprehensive income/(loss)	6	(2)	3	(18)
Accumulated Other Comprehensive Income (Loss)
Limited Partners Capital Account [Line Items]
Other comprehensive income/(loss)	6	(2)	3	(18)
Non-redeemable, non-controlling interests
Limited Partners Capital Account [Line Items]
Net income attributable to non-controlling interests		(1)		(1)
HOST HOTELS & RESORTS L.P.
Limited Partners Capital Account [Line Items]
Beginning Balance	6,150	7,070	6,326	7,325
Net loss	(61)	(355)	(214)	(358)
Net loss	(60)	(353)	(212)	(356)
Issuance of common OP units to Host Inc. for comprehensive stock plans, net	6	6	2	1
Repurchase of common OP units				(147)
Distributions declared on common OP units				(141)
Common OP unit issuances	138		138
Changes in ownership and other	(3)	1	(20)	58
Other comprehensive income/(loss)	6	(2)	3	(18)
Ending Balance	6,237	6,722	6,237	6,722
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	6,221	7,135	6,394	7,374
Net loss	(60)	(352)	(212)	(355)
Issuance of common OP units to Host Inc. for comprehensive stock plans, net	6	6	2	1
Repurchase of common OP units				(147)
Distributions declared on common OP units				(141)
Common OP unit issuances	138		138
Changes in ownership and other	(3)	1	(20)	58
Ending Balance	6,302	6,790	6,302	6,790
HOST HOTELS & RESORTS L.P. | Accumulated Other Comprehensive Income (Loss)
Limited Partners Capital Account [Line Items]
Beginning Balance	(77)	(72)	(74)	(56)
Other comprehensive income/(loss)	6	(2)	3	(18)
Ending Balance	(71)	(74)	(71)	(74)
HOST HOTELS & RESORTS L.P. | Non-redeemable, non-controlling interests
Limited Partners Capital Account [Line Items]
Beginning Balance	5	6	5	6
Net income attributable to non-controlling interests		(1)		(1)
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	124	84	108	142
Net loss	(1)	(3)	(2)	(3)
Distributions declared on common OP units				(2)
Changes in ownership and other	2		19	(56)
Ending Balance	$ 125	$ 81	$ 125	$ 81