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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 Core Bond ETF  
Shareholder Report [Line Items]  
Fund Name Putnam ESG Core Bond ETF
Class Name Putnam ESG Core Bond ETF
Trading Symbol PCRB
Security Exchange Name NYSE
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam ESG Core Bond 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 Core Bond ETF
$18
0.34%
[1],[2]
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.34%
Net Assets $ 683,678,858
Holdings Count | $ / shares 438 [3]
Investment Company Portfolio Turnover 123.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of October 31, 2024)
Total Net Assets
$683,678,858
Total Number of Portfolio Holdings*
438
Portfolio Turnover Rate
123%
[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), including to-be-announced mortgage security trades, if any, in addition to the market value of securities. Holdings and allocations may vary over time.