Equity of Host Inc. and Capital of Host L.P. - Components of Equity (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Stockholders Equity Note [Line Items]
Beginning Balance	$ 6,446	$ 6,326
Net income loss	116	(152)
Net income loss	117	(152)
Issuance of common stock for comprehensive stock plans, net	(9)	(4)
Dividends declared on common stock	(22)
Changes in ownership and other	(14)	(17)
Other comprehensive income/(loss)	7	(3)
Ending Balance	6,525	6,150
Common Stock
Stockholders Equity Note [Line Items]
Beginning Balance	7	7
Ending Balance	7	7
Additional Paid-in Capital
Stockholders Equity Note [Line Items]
Beginning Balance	7,702	7,568
Issuance of common stock for comprehensive stock plans, net	(9)	(4)
Changes in ownership and other	(13)	(17)
Ending Balance	7,680	7,547
Accumulated Other Comprehensive Income (Loss)
Stockholders Equity Note [Line Items]
Beginning Balance	(76)	(74)
Other comprehensive income/(loss)	7	(3)
Ending Balance	(69)	(77)
Retained Earnings / (Deficit)
Stockholders Equity Note [Line Items]
Beginning Balance	(1,192)	(1,180)
Net income loss	116	(152)
Dividends declared on common stock	(22)
Ending Balance	(1,098)	(1,332)
Non-redeemable, non-controlling interests
Stockholders Equity Note [Line Items]
Beginning Balance	5	5
Net income loss	1
Changes in ownership and other	(1)
Ending Balance	5	5
Redeemable, non-controlling interests
Stockholders Equity Note [Line Items]
Beginning Balance	126	108
Net income loss	1	(1)
Issuance of common OP units	56
Changes in ownership and other	20	17
Ending Balance	$ 203	$ 124