v3.26.1
Shareholder Report
 6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name BlackRock ETF Trust
Entity Central Index Key 0001761055
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
C000244680 [Member]  
Shareholder Report [Line Items]  
Fund Name iShares U.S. Large Cap Premium Income Active ETF
Class Name iShares U.S. Large Cap Premium Income Active ETF
Trading Symbol BALI
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about iShares U.S. Large Cap Premium Income Active ETF (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 474-2737.
Additional Information Phone Number (800) 474-2737
Additional Information Website blackrock.com/fundreports
Expenses [Text Block]
What were the Fund costs for the period?
(based on a hypothetical $10,000 investment)
Fund name Costs of a $10,000
investment		 Costs paid as a percentage of a
$10,000 investment
iShares U.S. Large Cap Premium Income Active ETF $18 0.35%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.35% [1]
Net Assets $ 1,262,133,626
Holdings Count | Holding 202
Investment Company Portfolio Turnover 58.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $1,262,133,626
Number of Portfolio Holdings 202
Portfolio Turnover Rate 58%
Holdings [Text Block]
What did the Fund invest in?
(as of June 30, 2026)
Sector allocation
Sector(a) Percent of Total
Investments(b)
Information Technology 36.3 %
Health Care 10.6 %
Financials 10.4 %
Communication Services 10.0 %
Consumer Discretionary 9.9 %
Industrials 8.0 %
Consumer Staples 6.0 %
Energy 4.1 %
Utilities 1.6 %
Materials 1.6 %
Real Estate 1.5 %
Ten largest holdings
Security Percent of Total
Investments(b)
NVIDIA Corp. 7.1 %
Apple Inc. 6.0 %
Microsoft Corp. 4.9 %
Amazon.com, Inc. 3.3 %
Alphabet, Inc., Class A 3.2 %
Alphabet, Inc., Class C, NVS 2.6 %
Broadcom, Inc. 2.5 %
Johnson & Johnson 2.2 %
Micron Technology, Inc. 1.9 %
Meta Platforms, Inc., Class A 1.6 %
​(a)
For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.
​(b)
Excludes short-term securities, short investments and options, if any.
Largest Holdings [Text Block]
Ten largest holdings
Security Percent of Total
Investments(b)
NVIDIA Corp. 7.1 %
Apple Inc. 6.0 %
Microsoft Corp. 4.9 %
Amazon.com, Inc. 3.3 %
Alphabet, Inc., Class A 3.2 %
Alphabet, Inc., Class C, NVS 2.6 %
Broadcom, Inc. 2.5 %
Johnson & Johnson 2.2 %
Micron Technology, Inc. 1.9 %
Meta Platforms, Inc., Class A 1.6 %
(b)Excludes short-term securities, short investments and options, if any.
C000265899 [Member]  
Shareholder Report [Line Items]  
Fund Name iShares Nasdaq Premium Income Active ETF
Class Name iShares Nasdaq Premium Income Active ETF
Trading Symbol BALQ
Security Exchange Name NASDAQ
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about iShares Nasdaq Premium Income Active ETF (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at blackrock.com/fundreports. You can also request this information by contacting us at (800) 474-2737.
Additional Information Phone Number (800) 474-2737
Additional Information Website blackrock.com/fundreports
Expenses [Text Block]
What were the Fund costs for the period?
(based on a hypothetical $10,000 investment)
Fund name Costs of a $10,000
investment		 Costs paid as a percentage of a
$10,000 investment
iShares Nasdaq Premium Income Active ETF $19 0.35%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 19
Expense Ratio, Percent 0.35% [2]
Net Assets $ 15,650,865
Holdings Count | Holding 117
Investment Company Portfolio Turnover 57.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $15,650,865
Number of Portfolio Holdings 117
Portfolio Turnover Rate 57%
Holdings [Text Block]
What did the Fund invest in?
(as of June 30, 2026)
Sector allocation
Sector(a) Percent of Total
Investments(b)
Information Technology 61.4 %
Communication Services 12.0 %
Consumer Discretionary 10.1 %
Consumer Staples 5.8 %
Industrials 4.4 %
Health Care 3.7 %
Energy 1.2 %
Materials 0.8 %
Financials 0.6 %
Ten largest holdings
Security Percent of Total
Investments(b)
NVIDIA Corp. 8.2 %
Apple Inc. 7.3 %
Micron Technology, Inc. 6.0 %
Microsoft Corp. 5.9 %
Amazon.com, Inc. 4.9 %
Advanced Micro Devices, Inc. 4.5 %
Applied Materials, Inc. 4.2 %
Alphabet, Inc., Class A 3.8 %
Lam Research Corp. 3.5 %
Tesla, Inc. 3.4 %
​(a)
For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.
​(b)
Excludes short-term securities, short investments and options, if any.
Largest Holdings [Text Block]
Ten largest holdings
Security Percent of Total
Investments(b)
NVIDIA Corp. 8.2 %
Apple Inc. 7.3 %
Micron Technology, Inc. 6.0 %
Microsoft Corp. 5.9 %
Amazon.com, Inc. 4.9 %
Advanced Micro Devices, Inc. 4.5 %
Applied Materials, Inc. 4.2 %
Alphabet, Inc., Class A 3.8 %
Lam Research Corp. 3.5 %
Tesla, Inc. 3.4 %
(b)Excludes short-term securities, short investments and options, if any.
[1] Annualized.
[2] Annualized.