| Label | Element | Value |
|---|---|---|
| Putnam BDC Income ETF | Investments in Underlying Funds [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 99.20% |
| Putnam BDC Income ETF | Short-Term Investments [Member] | ||
| Holdings [Line Items] | oef_HoldingsLineItems | |
| Percent of Total Investments | oef_PctOfTotalInv | 0.80% |