Equity of Host Inc. and Capital of Host L.P. - Components of Equity (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Stockholders Equity Note [Line Items]
Beginning Balance	$ 6,782	$ 6,237	$ 6,446	$ 6,326
Net income loss	114	(119)	486	(331)
Net income loss	115	(119)	487	(331)
Issuance of common stock for comprehensive stock plans, net	10	6	13	8
Dividends declared on common stock	(85)		(150)
Distributions to non-controlling interests	(1)		(1)
Common stock issuances				138
Changes in ownership and other	(1)	6	23	(14)
Other comprehensive income/(loss)	(3)	(4)	(1)	(1)
Ending Balance	6,817	6,126	6,817	6,126
Common Stock
Stockholders Equity Note [Line Items]
Beginning Balance	7	7	7	7
Ending Balance	7	7	7	7
Additional Paid-in Capital
Stockholders Equity Note [Line Items]
Beginning Balance	7,729	7,688	7,702	7,568
Issuance of common stock for comprehensive stock plans, net	10	6	13	8
Common stock issuances				138
Changes in ownership and other	(1)	6	23	(14)
Ending Balance	7,738	7,700	7,738	7,700
Accumulated Other Comprehensive Income (Loss)
Stockholders Equity Note [Line Items]
Beginning Balance	(74)	(71)	(76)	(74)
Other comprehensive income/(loss)	(3)	(4)	(1)	(1)
Ending Balance	(77)	(75)	(77)	(75)
Retained Earnings / (Deficit)
Stockholders Equity Note [Line Items]
Beginning Balance	(885)	(1,392)	(1,192)	(1,180)
Net income loss	114	(119)	486	(331)
Dividends declared on common stock	(85)		(150)
Ending Balance	(856)	(1,511)	(856)	(1,511)
Non-redeemable, non-controlling interests
Stockholders Equity Note [Line Items]
Beginning Balance	5	5	5	5
Net income loss	1	0	1
Distributions to non-controlling interests	(1)		(1)
Changes in ownership and other		0
Ending Balance	5	5	5	5
Redeemable, non-controlling interests
Stockholders Equity Note [Line Items]
Beginning Balance	163	125	126	108
Net income loss	1	(1)	7	(3)
Issuance of common OP units			56
Distributions to non-controlling interests	(1)		(2)
Changes in ownership and other	2	(5)	(22)	14
Ending Balance	$ 165	$ 119	$ 165	$ 119