Shareholder Report |
12 Months Ended | |||||||||||||||||||||
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Apr. 30, 2026
USD ($)
$ / shares
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| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Document Type | N-CSR | |||||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||||
| Registrant Name | Putnam ETF Trust | |||||||||||||||||||||
| Entity Central Index Key | 0001845809 | |||||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||||
| Document Period End Date | Apr. 30, 2026 | |||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | annual shareholder report | |||||||||||||||||||||
| Putnam BDC Income ETF | ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Fund Name | Putnam BDC Income ETF | |||||||||||||||||||||
| Class Name | Putnam BDC Income ETF | |||||||||||||||||||||
| Trading Symbol | PBDC | |||||||||||||||||||||
| Security Exchange Name | NYSEArca | |||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Putnam BDC Income ETF for the period May 1, 2025, to April 30, 2026. | |||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.franklintempleton.com/regulatory-fund-documents. You can also request this information by contacting us at (800) DIAL BEN/342-5236. | |||||||||||||||||||||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period.
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| Additional Information Phone Number | (800) DIAL BEN/342-5236 | |||||||||||||||||||||
| Additional Information Website | https://www.franklintempleton.com/regulatory-fund-documents | |||||||||||||||||||||
| Expenses [Text Block] | WHAT WERE THE FUND COSTS FOR THE LAST YEAR? (based on a hypothetical $10,000 investment)
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[1] | ||||||||||||||||||||
| Expenses Paid, Amount | $ 75 | |||||||||||||||||||||
| Expense Ratio, Percent | 0.75% | |||||||||||||||||||||
| Factors Affecting Performance [Text Block] | HOW DID THE FUND PERFORM LAST YEAR AND WHAT AFFECTED ITS PERFORMANCE? For the twelve months ended April 30, 2026, Putnam BDC Income ETF returned 0.13%. The Fund compares its performance to the S&P BDC Index, which returned -1.87% for the same period. PERFORMANCE HIGHLIGHTS
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. | |||||||||||||||||||||
| Line Graph [Table Text Block] | ![]() |
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| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS (%) Period Ended April 30, 2026
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| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund shares. | |||||||||||||||||||||
| Material Change Date | May 01, 2025 | |||||||||||||||||||||
| Updated Performance Information Location [Text Block] | For current month-end performance, please call Franklin Templeton at (800) DIAL BEN/342-5236 or visit https://www.franklintempleton.com/investments/options/exchange-traded-funds. Important data provider notices and terms available at www.franklintempletondatasources.com.
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| Net Assets | $ 278,063,558 | |||||||||||||||||||||
| Holdings Count | $ / shares | 24 | |||||||||||||||||||||
| Advisory Fees Paid, Amount | $ 1,794,881 | |||||||||||||||||||||
| Investment Company Portfolio Turnover | 38.00% | |||||||||||||||||||||
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of April 30, 2026)
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| Holdings [Text Block] | WHAT DID THE FUND INVEST IN? (as of April 30, 2026) Portfolio Composition* (% of Total Investments) ![]() |
[2] | ||||||||||||||||||||
| Material Fund Change [Text Block] | HOW HAS THE FUND CHANGED? Effective September 25, 2025, the Fund’s prospectus and summary prospectus disclosure regarding the Fund’s non-diversified status was deleted to reflect that the Fund is currently operating as a diversified fund. Under a new non-fundamental investment policy adopted by the Trustees, the Fund may not and will not: (A) With respect to 75% of its total assets, invest in securities of any issuer if, immediately after such investment, more than 5% of the total assets of the Fund (taken at current value) would be invested in the securities of such issuer; provided that this limitation does not apply to obligations issued or guaranteed as to interest or principal by the U.S. government or its agencies or instrumentalities or to securities issued by other investment companies. (B) With respect to 75% of its total assets, acquire more than 10% of the outstanding voting securities of any issuer; provided that this limitation does not apply to obligations issued or guaranteed as to interest or principal by the U.S. government or its agencies or instrumentalities or to securities issued by other investment companies. Under current law, shareholder approval would be required for the Fund to resume operating as a non-diversified fund. In connection with the Fund’s transition to operating as a diversified fund, ‘Non-diversified risk’ has been removed from the Fund’s principal risks. This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by September 1, 2026, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) DIAL BEN/342-5236 or
ETFs-Product@franklintempleton.com. |
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| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since May 1, 2025. For more complete information, you may review the Fund’s current prospectus and any applicable supplements and the Fund’s next prospectus, which we expect to be available by September 1, 2026, at https://www.franklintempleton.com/regulatory-fund-documents or upon request at (800) DIAL BEN/342-5236 or ETFs-Product@franklintempleton.com. | |||||||||||||||||||||
| Updated Prospectus Phone Number | (800) DIAL BEN/342-5236 | |||||||||||||||||||||
| Updated Prospectus Email Address | ETFs-Product@franklintempleton.com | |||||||||||||||||||||
| Updated Prospectus Web Address | https://www.franklintempleton.com/regulatory-fund-documentshttps://www.franklintempleton.com/regulatory-fund-documents | |||||||||||||||||||||
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