Mortgage Notes, Term Loan, and Revolving Credit Facility - Summary of Mortgage Notes, Term Loan, and Revolving Credit Facility Secured by Company's Properties (Details) $ in Thousands	9 Months Ended
Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
Total principal balance	$ 1,163,282
Deferred financing costs, net	(9,493)
Premium on assumed debt, net	1,602
Mortgage notes, term loan, and revolving credit facility, net	$ 1,155,391
One-Month LIBOR [Member]
Debt Instrument [Line Items]
Interest Rate	1.20%
TA Multifamily (Excluding 55 West) [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	3.76%
Maturity Dates	Jun. 01, 2024
Total principal balance	$ 211,249
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance
Industrial Properties [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Maturity Dates	Jun. 01, 2022
Total principal balance	$ 146,000
Amortization Period	Interest Only
Prepayment Provisions	Spread Maintenance
Industrial Properties [Member] \| Term Loan [Member] \| One-Month LIBOR [Member]
Debt Instrument [Line Items]
Interest Rate	2.10%
Industrial Properties [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maturity Dates	Jun. 01, 2022
Total principal balance	$ 146,000
Amortization Period	Interest Only
Prepayment Provisions	None
Industrial Properties [Member] \| Revolving Credit Facility [Member] \| One-Month LIBOR [Member]
Debt Instrument [Line Items]
Interest Rate	2.10%
Emory Point [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	3.66%
Maturity Dates	May 05, 2024
Total principal balance	$ 130,000
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance
Nevada West [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	3.75%
Maturity Dates	Sep. 01, 2024
Total principal balance	$ 121,380
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance
Elysian West [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	3.77%
Maturity Dates	Sep. 01, 2024
Total principal balance	$ 75,400
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance
55 West [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Maturity Dates	May 09, 2022
Total principal balance	$ 63,600
Amortization Period	Interest Only
Prepayment Provisions	Spread Maintenance
55 West [Member] \| Mortgage Notes [Member] \| One-Month LIBOR [Member]
Debt Instrument [Line Items]
Interest Rate	2.18%
Mountain Gate & Trails [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	3.75%
Maturity Dates	Sep. 01, 2024
Total principal balance	$ 59,985
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance
Gilbert Vistara [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	4.09%
Maturity Dates	Oct. 01, 2028
Total principal balance	$ 48,129
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance
Gilbert Redstone [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	4.92%
Maturity Dates	Apr. 10, 2029
Total principal balance	$ 40,484
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance
ACG II - Highlands [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	3.62%
Maturity Dates	Oct. 01, 2024
Total principal balance	$ 27,715
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance
Sonora Canyon [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	3.76%
Maturity Dates	Jun. 01, 2024
Total principal balance	$ 26,455
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance
ACG II - Brooks Landing [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	4.60%
Maturity Dates	Oct. 06, 2025
Total principal balance	$ 24,500
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance
ACG II - Woodlands [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	4.83%
Maturity Dates	Mar. 06, 2024
Total principal balance	$ 23,485
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance
ACG II - Sterling Pointe [Member] \| Mortgage Notes [Member]
Debt Instrument [Line Items]
Interest Rate	5.36%
Maturity Dates	Jan. 06, 2024
Total principal balance	$ 18,900
Amortization Period	Interest Only
Prepayment Provisions	Yield Maintenance

Debt instrument prepayment provisions.

No definition available.

Name:	breit_DebtInstrumentPrepaymentProvisions
Namespace Prefix:	breit_
Data Type:	xbrli:stringItemType
Balance Type:	na
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

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: 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(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

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

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
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

+ Details

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

- Definition

Amount, after accumulated amortization, of debt premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

+ Details

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

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-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

- Details

Name:	us-gaap_VariableRateAxis=breit_OneMonthLondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_TAMultifamilyPortfolioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=breit_MortgageNotesPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_IndustrialPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=breit_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_EmoryPointLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_NevadaWestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_ElysianWestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_FiftyFiveWestLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_MountainGateAndTrailsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_GilbertVistaraMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_GilbertRedstoneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_ACGIIHighlandsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_SonoraCanyonApartmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_ACGIIBrooksLandingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_ACGIIWoodlandsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=breit_ACGIISterlingPointeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: