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Shareholder Report
 6 Months Ended
Oct. 31, 2024
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Putnam ETF Trust
Entity Central Index Key 0001845809
Entity Investment Company Type N-1A
Document Period End Date Oct. 31, 2024
Putnam ESG High Yield ETF  
Shareholder Report [Line Items]  
Fund Name Putnam ESG High Yield ETF
Class Name Putnam ESG High Yield ETF
Trading Symbol PHYD
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam ESG High Yield ETF for the period May 1, 2024, to October 31, 2024.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
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.
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 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*,†
Putnam ESG High Yield ETF
$28
0.53%
[1],[2]
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.53%
Net Assets $ 163,502,470
Holdings Count | $ / shares 318 [3]
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of October 31, 2024)
Total Net Assets
$163,502,470
Total Number of Portfolio Holdings*
318
Portfolio Turnover Rate
23%
[3]
Holdings [Text Block]
image
 [4]
Updated Prospectus Web Address https://www.franklintempleton.com/regulatory-fund-documents
[1]
* Reflects fee waivers and/or expense reimbursements, without which expenses would have been higher.
[2]
† Annualized.
[3]
* Includes derivatives, if applicable.
[4]
Cash and Equivalents, if any, represent the market value weights of cash, derivatives, short-term securities, and other unclassified assets in the portfolio. Allocations may not total 100% because the chart includes the notional value of certain derivatives (the economic value for purposes of calculating periodic payment obligations), in addition to the market value of securities. Holdings and allocations may vary over time.