Shareholder Report, Average Annual Return (Details) 1014013_Franklin U.S. Equity Index ETF_Single Class_TSR Annual {Single Class}

12 Months Ended

60 Months Ended

118 Months Ended

Mar. 31, 2026

Mar. 31, 2026

Mar. 31, 2026

Franklin U.S. Equity Index ETF

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Franklin U.S. Equity Index ETF (NAV)

Average Annual Return, Percent

17.47%

10.51%

11.10%

Morningstar US Target Market Exposure Index [Member]

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Morningstar US Target Market Exposure Index

Average Annual Return, Percent

^[1]

17.53%

11.54%

Linked Morningstar US Target Market Exposure Index [Member]

Average Annual Return [Line Items]

Line Graph and Table Measure Name

Linked Morningstar US Target Market Exposure Index

Average Annual Return, Percent

^[2]

17.53%

10.56%

11.12%

[1]

†	The Morningstar US Target Market Exposure Index did not commence calculation and publication until November 22, 2018.

[2]

††	The Linked Morningstar US Target Market Exposure Index measures the performance of the Fund’s previous underlying index, the LibertyQ Global Equity Index-NR, through July 31, 2022, followed by the performance of the Underlying Index thereafter.