Components of Capital (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Limited Partners Capital Account [Line Items]
Net loss	$ (152)	$ (3)
Net loss	(152)	(3)
Issuance of common stock for comprehensive stock plans, net	(4)	(5)
Repurchase of common OP units		(147)
Other comprehensive income/(loss)	(3)	(16)
Accumulated Other Comprehensive Income (Loss)
Limited Partners Capital Account [Line Items]
Other comprehensive income/(loss)	(3)	(16)
HOST HOTELS & RESORTS L.P.
Limited Partners Capital Account [Line Items]
Beginning Balance	6,326	7,325
Net loss	(153)	(3)
Net loss	(152)	(3)
Issuance of common stock for comprehensive stock plans, net	(4)	(5)
Repurchase of common OP units		(147)
Distributions declared on common OP units		(141)
Changes in ownership and other	(17)	57
Other comprehensive income/(loss)	(3)	(16)
Ending Balance	6,150	7,070
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	6,394	7,374
Net loss	(152)	(3)
Issuance of common stock for comprehensive stock plans, net	(4)	(5)
Repurchase of common OP units		(147)
Distributions declared on common OP units		(141)
Changes in ownership and other	(17)	57
Ending Balance	6,221	7,135
HOST HOTELS & RESORTS L.P. | Accumulated Other Comprehensive Income (Loss)
Limited Partners Capital Account [Line Items]
Beginning Balance	(74)	(56)
Other comprehensive income/(loss)	(3)	(16)
Ending Balance	(77)	(72)
HOST HOTELS & RESORTS L.P. | Non-redeemable, non-controlling interests
Limited Partners Capital Account [Line Items]
Beginning Balance	5	6
Ending Balance	5	6
HOST HOTELS & RESORTS L.P. | Limited partnership interests of third parties
Limited Partners Capital Account [Line Items]
Beginning Balance	108	142
Net loss	(1)
Distributions declared on common OP units		(2)
Changes in ownership and other	17	(56)
Ending Balance	$ 124	$ 84