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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 Emerging Markets ex-China ETF  
Shareholder Report [Line Items]  
Fund Name Putnam Emerging Markets Ex-China ETF
Class Name Putnam Emerging Markets Ex-China ETF
Trading Symbol PEMX
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Putnam Emerging Markets Ex-China 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 Emerging Markets Ex-China ETF
$44
0.84%
[1],[2]
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.84%
Net Assets $ 8,065,506
Holdings Count | $ / shares 51 [3]
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of October 31, 2024)
Total Net Assets
$8,065,506
Total Number of Portfolio Holdings*
51
Portfolio Turnover Rate
21%
[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. Holdings and allocations may vary over time.