v3.26.1
Shareholder Report
 6 Months Ended
Apr. 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 Apr. 30, 2026
C000249919 [Member]  
Shareholder Report [Line Items]  
Fund Name iShares Enhanced Short-Term Bond Active ETF
Class Name iShares Enhanced Short-Term Bond Active ETF
Trading Symbol CSHP
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about iShares Enhanced Short-Term Bond Active ETF (the “Fund”) for the period of November 1, 2025 to April 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 last six months?
(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 Enhanced Short-Term Bond Active ETF $10 0.20%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.20% [1]
Net Assets $ 190,394,590
Holdings Count | Holding 56
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $190,394,590
Number of Portfolio Holdings 56
Portfolio Turnover Rate 0%
Holdings [Text Block]
What did the Fund invest in?
(as of April 30, 2026)
Portfolio composition
Investment Type Percent of Total
Investments(a)
U.S. Treasury Obligations 63.0 %
Foreign Government Obligations 27.8 %
Corporate Bonds & Notes 9.2 %
Ten largest holdings
Security Percent of Total
Investments(a)
U.S. Treasury Bills, 3.70%, 07/21/26 20.0 %
U.S. Treasury Bills, 3.67%, 05/05/26 9.8 %
U.S. Treasury Bills, 3.69%, 06/30/26 9.5 %
U.S. Treasury Bills, 3.69%, 06/18/26 8.8 %
U.S. Treasury Bills, 3.68%, 07/09/26 5.6 %
U.S. Treasury Bills, 3.69%, 06/04/26 5.5 %
Italy Buoni Ordinari del Tesoro BOT, 2.14%, 08/14/26 4.6 %
France Treasury Bills, 2.23%, 08/26/26 4.6 %
Spain Letras del Tesoro, 2.20%, 09/04/26 4.6 %
Portugal Treasury Bills, 2.32%, 11/20/26 4.6 %
​(a)
Excludes money market funds.
Largest Holdings [Text Block]
Ten largest holdings
Security Percent of Total
Investments(a)
U.S. Treasury Bills, 3.70%, 07/21/26 20.0 %
U.S. Treasury Bills, 3.67%, 05/05/26 9.8 %
U.S. Treasury Bills, 3.69%, 06/30/26 9.5 %
U.S. Treasury Bills, 3.69%, 06/18/26 8.8 %
U.S. Treasury Bills, 3.68%, 07/09/26 5.6 %
U.S. Treasury Bills, 3.69%, 06/04/26 5.5 %
Italy Buoni Ordinari del Tesoro BOT, 2.14%, 08/14/26 4.6 %
France Treasury Bills, 2.23%, 08/26/26 4.6 %
Spain Letras del Tesoro, 2.20%, 09/04/26 4.6 %
Portugal Treasury Bills, 2.32%, 11/20/26 4.6 %
​(a)
Excludes money market funds.
C000257655 [Member]  
Shareholder Report [Line Items]  
Fund Name iShares Managed Futures Active ETF
Class Name iShares Managed Futures Active ETF
Trading Symbol ISMF
Security Exchange Name CboeBZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about iShares Managed Futures Active ETF (the “Fund”) for the period of November 1, 2025 to April 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 last six months?
(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 Managed Futures Active ETF $42 0.80%(a)
​(a)
Annualized.
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.80% [2]
Net Assets $ 57,160,053
Holdings Count | Holding 92
Investment Company Portfolio Turnover 0.00%
Additional Fund Statistics [Text Block]
Key Fund statistics
Net Assets $57,160,053
Number of Portfolio Holdings 92
Portfolio Turnover Rate 0%
Holdings [Text Block]
What did the Fund invest in?
(as of April 30, 2026)
Portfolio composition
Percent of
Notional Amount
  Asset Type Long Short Total
Forward Foreign Currency Exchange Contracts 28.6 % 30.8 % 59.4 %
Futures Contracts 10.9 % 13.3 % 24.2 %
U.S. Treasury Obligations 16.3 % — % 16.3 %
Money Market Funds 0.1 — 0.1 %
55.9 44.1 100.0
[1]
Annualized.
[2] Annualized.