Equity of Host Inc. and Capital of Host L.P. - Components of Equity (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Stockholders Equity Note [Line Items]
Beginning Balance	$ 6,525	$ 6,150	$ 6,446	$ 6,326
Net income loss	256	(60)	372	(212)
Net income loss	255	(60)	372	(212)
Issuance of common stock for comprehensive stock plans, net	12	6	3	2
Dividends declared on common stock	(43)		(65)
Common stock 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
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	7,680	7,547	7,702	7,568
Issuance of common stock for comprehensive stock plans, net	12	6	3	2
Common stock issuances		138		138
Changes in ownership and other	37	(3)	24	(20)
Ending Balance	7,729	7,688	7,729	7,688
Accumulated Other Comprehensive Income (Loss)
Stockholders Equity Note [Line Items]
Beginning Balance	(69)	(77)	(76)	(74)
Other comprehensive income/(loss)	(5)	6	2	3
Ending Balance	(74)	(71)	(74)	(71)
Retained Earnings / (Deficit)
Stockholders Equity Note [Line Items]
Beginning Balance	(1,098)	(1,332)	(1,192)	(1,180)
Net income loss	256	(60)	372	(212)
Dividends declared on common stock	(43)		(65)
Ending Balance	(885)	(1,392)	(885)	(1,392)
Non-redeemable, non-controlling interests
Stockholders Equity Note [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
Redeemable, non-controlling interests
Stockholders Equity Note [Line Items]
Beginning Balance	203	124	126	108
Net income loss	5	(1)	6	(2)
Issuance of common OP units			56
Distributions to non-controlling interests	(1)		(1)
Changes in ownership and other	(44)	2	(24)	19
Ending Balance	$ 163	$ 125	$ 163	$ 125