Shareholder Report
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6 Months Ended |
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Apr. 30, 2026
USD ($)
Holding
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| Shareholder Report [Line Items] |
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| Document Type |
N-CSRS
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| Amendment Flag |
false
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| Registrant Name |
BlackRock ETF Trust
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| Entity Central Index Key |
0001761055
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| Entity Investment Company Type |
N-1A
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| Document Period End Date |
Apr. 30, 2026
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| C000256702 |
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| Shareholder Report [Line Items] |
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| Fund Name |
iShares Government Money Market ETF
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| Trading Symbol |
GMMF
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| Security Exchange Name |
NYSE
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| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about iShares Government Money Market ETF (the “Fund”) for the period of November 1, 2025 to April 30, 2026.
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| Shareholder Report Annual or Semi-Annual |
Semi-Annual Shareholder Report
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| 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.
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| Additional Information Phone Number |
(800) 474-2737
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| Additional Information Website |
blackrock.com/fundreports
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| Expenses [Text Block] |
What were the Fund costs for the last six months?(based on a hypothetical $10,000 investment) Table SummaryFund name | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment |
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iShares Government Money Market ETF | $10 | 0.20%Footnote Reference(a) |
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| Footnote | Description | Footnote(a) | Annualized. |
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| Expenses Paid, Amount |
$ 10
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| Expense Ratio, Percent |
0.20%
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[1] |
| AssetsNet |
$ 112,270,812
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| Holdings Count | Holding |
113
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| Additional Fund Statistics [Text Block] |
Table SummaryNet Assets........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | $112,270,812 |
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Number of Portfolio Holdings........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 113 |
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Current seven-day yields as of April 30, 2026 (The 7-Day SEC Yield may differ from the 7-Day Yield shown due to the fact that the 7-Day SEC Yield excludes distributed capital gains.) | 0 |
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7-Day SEC Yield........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 3.47% |
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7-Day Yield........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 3.47% |
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| Holdings [Text Block] |
Table SummaryAsset Type | Percent of
Net Assets |
|---|
U.S. Treasury Obligations........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 80.8% | U.S. Government Sponsored Agency Obligations........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 17.5 | Other Assets Less Liabilities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 1.7 | |
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| C000256703 |
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| Shareholder Report [Line Items] |
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| Fund Name |
iShares Prime Money Market ETF
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| Trading Symbol |
PMMF
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| Security Exchange Name |
NYSE
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|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about iShares Prime Money Market 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) Table SummaryFund name | Costs of a $10,000 investment | Costs paid as a percentage of a $10,000 investment |
|---|
iShares Prime Money Market ETF | $10 | 0.20%Footnote Reference(a) |
|---|
| Footnote | Description | Footnote(a) | Annualized. |
|
|
| Expenses Paid, Amount |
$ 10
|
|
| Expense Ratio, Percent |
0.20%
|
[2] |
| AssetsNet |
$ 556,495,559
|
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| Holdings Count | Holding |
217
|
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| Additional Fund Statistics [Text Block] |
Table SummaryNet Assets........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | $556,495,559 |
|---|
Number of Portfolio Holdings........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 217 |
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Current seven-day yields as of April 30, 2026 (The 7-Day SEC Yield may differ from the 7-Day Yield shown due to the fact that the 7-Day SEC Yield excludes distributed capital gains.) | 0 |
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7-Day SEC Yield........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 3.67% |
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7-Day Yield........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 3.67% |
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| Holdings [Text Block] |
Table SummaryAsset Type | Percent of
Net Assets |
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Repurchase Agreements........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 48.9% | Certificates of Deposit........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 30.5 | Commercial Paper........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 18.0 | U.S. Government Sponsored Agency Obligations........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 0.9 | Corporate Bonds........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 0.5 | U.S. Treasury Obligations........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 0.2 | Other Assets Less Liabilities........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ | 1.0 | |
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