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Non-Controlling Interests - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($) Entity	Dec. 31, 2020 USD ($)
Minority Interest [Line Items]
Number of majority-owned partnerships that have third-party, non-controlling ownership interests that have been consolidated \| Entity	2
Non-redeemable non-controlling interests - other consolidated partnerships \| $	$ 5	$ 5
HOST HOTELS & RESORTS L.P.
Minority Interest [Line Items]
OP units conversion basis	One common OP unit may be exchanged for 1.021494 shares of Host Inc
Shares issuable upon conversion of one OP unit	1.021494	1.021494

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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