Agreement expiration period.

No definition available.

Name:	hst_AgreementExpirationPeriod
Namespace Prefix:	hst_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument maturity period.

+ References

No definition available.

+ Details

Name:	hst_DebtInstrumentMaturityPeriod
Namespace Prefix:	hst_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Extension period.

+ References

No definition available.

+ Details

Name:	hst_ExtensionPeriod
Namespace Prefix:	hst_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of extension period.

+ References

No definition available.

+ Details

Name:	hst_NumberOfExtensionPeriod
Namespace Prefix:	hst_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of properties sold.

+ References

No definition available.

+ Details

Name:	hst_NumberOfPropertiesSold
Namespace Prefix:	hst_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of total commitment that has been contributed

+ References

No definition available.

+ Details

Name:	hst_PercentageOfCapitalContribution
Namespace Prefix:	hst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of loan of joint venture guaranteed by partners of joint ventures.

+ References

No definition available.

+ Details

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Namespace Prefix:	hst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average interest rate reduction.

+ References

No definition available.

+ Details

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Namespace Prefix:	hst_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of fixed fee revenue for the management of an investment fund portfolio. Excludes investment advisory, distribution and servicing, and performance fees.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the carrying value of a short-term real estate loan to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project, usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property. Note that there are separate concepts for the current and noncurrent portions of long-term construction loans.

+ References

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Name:	us-gaap_ConstructionLoan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Value of property contributed in noncash investing and financing activities.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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-SubTopic 30
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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Data Type:	num:percentItemType
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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(3))
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-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

+ References

No definition available.

+ Details

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- Definition

This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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-Name Accounting Standards Codification
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-SubTopic 225
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-Paragraph 1
-Subparagraph (SX 210.7-04(10))
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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(12))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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Period Type:	instant

- Definition

The amount of assets reported by an equity method investment of the entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
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-Paragraph 3
-Subparagraph (c)
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-Subparagraph (f)
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-Name Accounting Standards Codification
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-Paragraph 7
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Indicates the number of mortgages under each classification.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29.3)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateNumberOfLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of foreign currency exchange rate derivatives held by the entity at the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

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Name:	us-gaap_NumberOfForeignCurrencyDerivativesHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of units in a real estate property owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Total contributions made by each class of partners (i.e., general, limited and preferred partners).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
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Name:	us-gaap_PaymentsToAcquireInterestInJointVenture
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
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-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow from repayment of borrowings to finance the cost of construction.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
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-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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-Glossary Financing Activities
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
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-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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Balance Type:	credit
Period Type:	instant

- Details

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Investments in Affiliates - Additional Information (Detail) € in Millions, AUD in Millions, $ in Millions				12 Months Ended					60 Months Ended
	Aug. 31, 2016 USD ($)	Oct. 14, 2015 USD ($)	Oct. 14, 2015 AUD	Dec. 31, 2016 USD ($) Hotel Property Contract Room	Dec. 31, 2016 EUR (€) Property	Dec. 31, 2015 USD ($) Property	Dec. 31, 2015 EUR (€)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) Hotel Contract Room	Dec. 31, 2016 EUR (€) Hotel Contract Room
Investments In And Advances To Affiliates [Line Items]
Total assets				$ 2,285		$ 2,403			$ 2,285
Proceeds from sales of assets, net				467		277		$ 497
Mortgage repayment				137		35		384
Distributions from equity investments				$ 29		27		7
Foreign currency forward purchase contract \| Contract				6					6	6
Number of hotels \| Hotel				96					96	96
Total Debt				$ 1,215		1,269			$ 1,215
Mortgage debt				63		$ 200			63
Asia/Pacific Joint Venture \| Four Points by Sheraton Perth
Investments In And Advances To Affiliates [Line Items]
Proceeds from sales of assets, net \| AUD			AUD 91.5
Mortgage repayment \| AUD			43.0
Gains (losses) recognized from sale of properties		$ 8	AUD 11.0
Maui JV
Investments In And Advances To Affiliates [Line Items]
Construction loan outstanding				$ 9					$ 9
Investment ownership percentage				67.00%		67.00%			67.00%	67.00%
Number of rooms \| Room				131					131	131
Contribution of land									$ 36
Contribution to joint venture									87
Total Debt				$ 41		$ 68			$ 41
European Joint Venture
Investments In And Advances To Affiliates [Line Items]
Total assets \| €										€ 1,500.0
Management fees				$ 8		$ 11		$ 16
Number of extension period				two one-year extensions	two one-year extensions
Joint venture agreement expiration period				2021	2021
Number of properties sold \| Property						9
Proceeds from sales of assets, net \| €							€ 526.0
Mortgage repayment \| €							229.0
Distributions from equity investments \| €							328.5
Gains (losses) recognized from sale of properties						$ 43	€ 39.0
Number of hotels \| Hotel				10					10	10
Total Debt				$ 744		$ 797			$ 744
European Joint Venture \| Forward Currency Sale Contracts
Investments In And Advances To Affiliates [Line Items]
Foreign currency forward purchase contract \| Contract				4					4	4
Hedged amount of our net investment in the European joint venture				$ 199					$ 199	€ 177.0
European Joint Venture \| Debt Refinance
Investments In And Advances To Affiliates [Line Items]
Numbers of mortgage loans \| Property				2	2
Reduction weighted average interest rate				0.20%	0.20%
European Joint Venture \| Fund I
Investments In And Advances To Affiliates [Line Items]
Investment ownership percentage				32.10%					32.10%	32.10%
Partners contribution \| €					€ 463.0
Percentage of total equity commitment funded				67.00%					67.00%	67.00%
Number of hotels \| Hotel				3					3	3
European Joint Venture \| Fund II
Investments In And Advances To Affiliates [Line Items]
Investment ownership percentage				33.40%					33.40%	33.40%
Partners contribution \| €					€ 301.0
Percentage of total equity commitment funded				67.00%					67.00%	67.00%
Extension Period				one year	one year
Number of hotels \| Hotel				7					7	7
Asia/Pacific Joint Venture
Investments In And Advances To Affiliates [Line Items]
Investment ownership percentage				25.00%		25.00%			25.00%	25.00%
Asia/Pacific Joint Venture \| India
Investments In And Advances To Affiliates [Line Items]
Investment ownership percentage				36.00%					36.00%	36.00%
Partners contribution				$ 103
Asia/Pacific Joint Venture \| India \| Bangalore
Investments In And Advances To Affiliates [Line Items]
Number of hotels \| Hotel				2					2	2
Asia/Pacific Joint Venture \| India \| Chennai
Investments In And Advances To Affiliates [Line Items]
Number of hotels \| Hotel				1					1	1
Asia/Pacific Joint Venture \| India \| New Delhi
Investments In And Advances To Affiliates [Line Items]
Number of hotels \| Hotel				2					2	2
Asia/Pacific Joint Venture \| HOST HOTELS & RESORTS, INC. \| India
Investments In And Advances To Affiliates [Line Items]
Partners contribution				$ 26
Asia/Pacific Joint Venture \| Completion Stage \| India
Investments In And Advances To Affiliates [Line Items]
Number of hotels \| Hotel				2					2	2
Hyatt Place Nashville Downtown
Investments In And Advances To Affiliates [Line Items]
Investment ownership percentage				50.00%					50.00%	50.00%
Refinanced construction loan	$ 31
New mortgage loan	$ 60
Maturity period of the loan				2019-08	2019-08
Mortgage loan, base rate description				1-month USD LIBOR plus	1-month USD LIBOR plus
Mortgage loan, interest rate				3.80%					3.80%	3.80%
Hyatt Place Nashville Downtown \| 1-month USD LIBOR
Investments In And Advances To Affiliates [Line Items]
Mortgage loan, basis spread on variable rate				3.00%	3.00%
Hyatt Place Nashville Downtown \| Tennessee
Investments In And Advances To Affiliates [Line Items]
Number of rooms \| Room				255					255	255
Hyatt Place Nashville Downtown \| Mortgages debt and other
Investments In And Advances To Affiliates [Line Items]
Number of extension period				two 12-month extension options	two 12-month extension options
Harbor Beach JV
Investments In And Advances To Affiliates [Line Items]
Investment ownership percentage				49.90%		49.90%			49.90%	49.90%
Total Debt				$ 149		$ 149			$ 149
Harbor Beach JV \| Mortgage Loan Portfolio
Investments In And Advances To Affiliates [Line Items]
Mortgage loan, interest rate				4.75%					4.75%	4.75%
Mortgage debt				$ 149					$ 149
Mortgage loan, maturity date				Jan. 01, 2024	Jan. 01, 2024
Mortgage loan, principal payment terms				No principal payments are due until the loan maturity date of January 1, 2024.	No principal payments are due until the loan maturity date of January 1, 2024.
Harbor Beach JV \| Florida
Investments In And Advances To Affiliates [Line Items]
Number of rooms \| Room				650					650	650
Guarantee Obligations \| Maui JV
Investments In And Advances To Affiliates [Line Items]
Construction loan outstanding				$ 9					$ 9
Guarantee Obligations \| Maui JV \| Construction Loan
Investments In And Advances To Affiliates [Line Items]
Percentage of construction loan for the Maui JV jointly and/or severally guaranteed by the partners of the joint ventures				100.00%					100.00%	100.00%
Not Guaranteed \| Maui JV
Investments In And Advances To Affiliates [Line Items]
Total Debt				$ 32					$ 32