Investment Objectives and Goals - iShares Floating Rate Loan Active ETF	Jul. 31, 2025
Prospectus [Line Items]
Risk/Return [Heading]	iSHARES FLOATING RATE LOAN ACTIVE ETF Ticker: BRLN Stock Exchange: Cboe BZX
Objective [Heading]	Investment Objective
Objective, Primary [Text Block]	The iShares Floating Rate Loan Active ETF (the “Fund”) primarily seeks to provide high current income and
Objective, Secondary [Text Block]	secondarily seeks to provide long-term capital appreciation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 2
-Subsection a

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 2
-Subsection a

Name:	oef_ObjectivePrimaryTextBlock
Namespace Prefix:	oef_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 2
-Subsection a

Name:	oef_ObjectiveSecondaryTextBlock
Namespace Prefix:	oef_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 1
-Subsection a

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Section 2
-Name Form N-1A
-Subsection a

Name:	dei_LegalEntityAxis=betfii_S000077718Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: