Label	Element	Value
Putnam ESG Core Bond ETF | U.S. Treasury/Agency Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	34.60%
Putnam ESG Core Bond ETF | Agency Pass-Through Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	29.00%
Putnam ESG Core Bond ETF | Investment-Grade Corporate Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	29.00%
Putnam ESG Core Bond ETF | Commercial Mortgage-Backed Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	5.20%
Putnam ESG Core Bond ETF | Asset-Backed Securities [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	5.10%
Putnam ESG Core Bond ETF | Investment Vehicles [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	1.60%
Putnam ESG Core Bond ETF | High-Yield Corporate Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	0.70%
Putnam ESG Core Bond ETF | Emerging-Market Bonds [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	0.20%
Putnam ESG Core Bond ETF | Cash and Equivalents [Member]
Holdings [Line Items]	oef_HoldingsLineItems
Percent of Net Asset Value	oef_PctOfNav	5.60%