Shareholder Report, Line Graph (Details) 1014046_Franklin U.S. Core Bond ETF_Single Class_TSR Annual {Single Class} - USD ($) |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2021 |
Mar. 31, 2020 |
Sep. 17, 2019 |
Mar. 31, 2026 |
|
| Franklin U.S. Core Bond ETF | ||||||||
| Account Value [Line Items] | ||||||||
| Line Graph and Table Measure Name | Franklin U.S. Core Bond ETF (NAV) | |||||||
| Accumulated Value | $ 10,185 | $ 9,701 | $ 9,539 | $ 10,029 | $ 10,526 | $ 10,313 | $ 10,000 | $ 10,626 |
| Bloomberg U.S. Aggregate Index [Member] | ||||||||
| Account Value [Line Items] | ||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Index | |||||||
| Accumulated Value | $ 10,130 | $ 9,659 | $ 9,498 | $ 9,975 | $ 10,407 | $ 10,333 | $ 10,000 | $ 10,571 |