Shareholder Report, Line Graph (Details) 1014015_Franklin Investment Grade Corporate 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 |
Mar. 31, 2019 |
Mar. 31, 2018 |
Mar. 31, 2017 |
Oct. 03, 2016 |
Mar. 31, 2026 |
|
| Franklin Investment Grade Corporate ETF | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Franklin Investment Grade Corporate ETF (NAV) | ||||||||||
| Accumulated Value | $ 11,681 | $ 11,140 | $ 10,698 | $ 11,437 | $ 11,951 | $ 10,921 | $ 10,498 | $ 10,051 | $ 9,817 | $ 10,000 | $ 12,210 |
| Bloomberg U.S. Aggregate Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Index | ||||||||||
| Accumulated Value | 11,130 | 10,613 | 10,435 | 10,960 | 11,434 | 11,354 | 10,423 | 9,976 | 9,857 | 10,000 | $ 11,614 |
| Bloomberg U.S. Corporate - Investment Grade Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Corporate - Investment Grade Index | ||||||||||
| Accumulated Value | $ 12,091 | $ 11,526 | $ 11,038 | $ 11,686 | $ 12,198 | $ 11,219 | $ 10,687 | $ 10,184 | $ 9,917 | $ 10,000 | $ 12,669 |