Mortgage Notes, Term Loans, and Revolving Credit Facilities - Summary of Mortgage Notes, Term Loans, and Revolving Credit Facilities Secured by Company's Properties (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.16%
Principal Balance Outstanding	$ 6,885,142,000	$ 2,125,825,000
Deferred financing costs, net	(53,546,000)	(16,075,000)
Premium on assumed debt, net	1,673,000	1,541,000
Mortgage notes, term loans, and revolving credit facilities, net	$ 6,833,269,000	2,111,291,000
Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Maturity Date	May 24, 2025
Fixed Rate Loans [Member]
Debt Instrument [Line Items]
Principal Balance Outstanding	$ 4,982,326,000	1,468,294,000
Fixed Rate Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.15%
Weighted Average Maturity Date	Nov. 16, 2025
Variable Rate Loans [Member]
Debt Instrument [Line Items]
Principal Balance Outstanding	$ 1,902,816,000	$ 657,531,000
Variable Rate Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Maturity Date	Feb. 18, 2024
One-Month LIBOR [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	2.50%	1.60%
One-Month LIBOR [Member] \| Variable Rate Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.71%
Mortgage Notes [Member] \| Fixed Rate Loans [Member]
Debt Instrument [Line Items]
Principal Balance Outstanding	$ 4,782,326,000	$ 1,468,294,000
Mortgage Notes [Member] \| Fixed Rate Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	4.08%
Weighted Average Maturity Date	Nov. 25, 2025
Mortgage Notes [Member] \| Variable Rate Loans [Member]
Debt Instrument [Line Items]
Principal Balance Outstanding	$ 675,116,000	63,600,000
Mortgage Notes [Member] \| Variable Rate Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Maturity Date	May 20, 2026
Mortgage Notes [Member] \| One-Month LIBOR [Member] \| Variable Rate Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.70%
Mezzanine Loan [Member] \| Fixed Rate Loans [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	5.85%
Principal Balance Outstanding	$ 200,000,000
Mezzanine Loan [Member] \| Fixed Rate Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Maturity Date	Apr. 05, 2025
Term Loan [Member] \| Variable Rate Loans [Member]
Debt Instrument [Line Items]
Principal Balance Outstanding	$ 603,500,000	208,500,000
Term Loan [Member] \| Variable Rate Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Maturity Date	Dec. 27, 2022
Term Loan [Member] \| One-Month LIBOR [Member] \| Variable Rate Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.69%
Revolving Credit Facility [Member] \| Variable Rate Loans [Member]
Debt Instrument [Line Items]
Maximum Facility Size	$ 903,500,000
Principal Balance Outstanding	$ 624,200,000	$ 385,431,000
Revolving Credit Facility [Member] \| Variable Rate Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Maturity Date	Oct. 21, 2022
Revolving Credit Facility [Member] \| One-Month LIBOR [Member] \| Variable Rate Loans [Member] \| Weighted Average [Member]
Debt Instrument [Line Items]
Weighted Average Interest Rate	1.73%

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

No definition available.

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-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 4: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt premium.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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 4: http://fasb.org/us-gaap/role/ref/legacyRef
-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:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=breit_FixedRateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=breit_VariableRateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=breit_OneMonthLondonInterbankOfferedRateLIBORMember
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_LongtermDebtTypeAxis=us-gaap_SubordinatedDebtMember
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: