S000094549 [Member] Investment Risks - Franklin California Municipal Income ETF	Sep. 30, 2025
Tax exempt investments risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Tax-exempt investments risk: Since the fund invests in tax-exempt bonds, which, to be treated as tax-exempt under the Internal Revenue Code of 1986, as amended, may be issued only by limited types of issuers for limited types of projects, the fund’s investments may be focused in certain market segments. Consequently, the fund may be more vulnerable to fluctuations in the values of the securities it holds than a fund that invests more broadly. The fund’s performance will be closely tied to the economic and political conditions in California, and can be more volatile than the performance of a more geographically diversified fund. To the extent the fund invests in securities of issuers located outside of California, the fund may also be exposed to the risks affecting other states. Certain provisions of the California Constitution and state statutes limit the taxing and spending authority of California’s government entities, which could impair the ability of California issuers to pay principal and/or interest on their obligations. Interest the fund receives might be taxable.
Prepayment Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Prepayment risk: If an issuer calls or redeems an investment during a time of declining interest rates, the fund may have to reinvest the proceeds in an investment offering a lower yield.
Fluctuation of net asset value and share price risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Fluctuation of net asset value and share price risk: Shares may trade at a larger premium or discount to the fund’s net asset value than shares of other ETFs. The net asset value of the fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s shares can be bought and sold in the secondary market at market prices. Disruptions to creations and redemptions, the existence of extreme market volatility or potential lack of an active trading market for the fund’s shares may result in the fund’s shares trading significantly above (at a premium) or below (at a discount) net asset value or the intraday value of the fund’s holdings. In addition, in stressed market conditions or periods of market disruption or volatility, the market for fund shares may become less liquid in response to deteriorating liquidity in the markets for the fund’s underlying portfolio holdings.
Trading issues risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Trading issues risk: The fund has limited trading history. There can be no assurance that an active trading market will develop or be maintained or that the market for fund shares will operate as intended, which could lead to the fund’s shares trading at wider spreads and larger premiums and discounts to net asset value than other actively managed ETFs. As a result, it may cost investors more to trade fund shares than shares of other ETFs. There is no guarantee that the fund will be able to attract market makers and authorized participants. Market makers and authorized participants are not obligated to make a market in the fund’s shares or to submit purchase and redemption orders for creation units. The market prices of the fund’s shares are expected to fluctuate, in some cases materially, in response to changes in the fund’s net asset value, the intraday value of the fund’s holdings and supply and demand for the fund’s shares. The Investment Manager cannot predict whether the fund’s shares will trade above, below or at their net asset value or the intraday value of the fund’s holdings. During periods when the fund is trading below its net asset value, investors may incur significant losses if they sell shares. The securities held by the fund may be traded in markets that close at a different time than the exchange on which the fund’s shares are listed. Liquidity in those securities may be reduced after the applicable closing times. Accordingly, during the time when the exchange is open but after the applicable market closing, fixing or settlement times, bid-ask spreads on the exchange and the corresponding premium or discount to the shares’ net asset value may widen.
Large shareholder transaction risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Large shareholder transaction risk: The fund is subject to the risk that shareholders will purchase or redeem large quantities of shares of the fund. The fund may be an investment option for mutual funds that are managed by the Investment Manager and its affiliates as “funds of funds.” Additionally, other investors from time to time may make substantial investments in the fund. Such shareholders may at times be considered to control the fund. In addition, a large number of shareholders may collectively purchase or redeem fund shares in large amounts rapidly or unexpectedly. Large shareholder transactions may adversely affect the fund’s liquidity and net assets. These redemptions may also adversely affect the fund’s performance if the fund is forced to sell securities, which may also increase the fund’s brokerage costs.
Authorized participant concentration risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Authorized participant concentration risk: Only an authorized participant may engage in creation and redemption transactions directly with the fund. The fund may have a limited number of financial institutions that act as authorized participants, none of which are obligated to engage in creation and/or redemption transactions. To the extent that those authorized participants do not engage in creation and redemption orders, there may be a significantly diminished trading market for fund shares or fund shares may trade at a discount (or premium) to net asset value and possibly face trading halts and/or de-listing.
Cash transactions risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Cash transactions risk: Unlike certain ETFs, the fund may effect creations and redemptions in cash or partially in cash. Therefore, it may be required to sell portfolio securities and subsequently recognize gains on such sales that the fund might not have recognized if it were to distribute portfolio securities in-kind. As such, investments in the fund’s shares may be less tax-efficient than an investment in an ETF that distributes portfolio securities entirely in-kind.
Market risks [Member]
Prospectus [Line Items]
Risk [Text Block]	Market risk: The value of investments in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, asset class, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund’s portfolio holdings, may negatively impact the fund’s performance, and may exacerbate other risks to which the fund is subject.
Management and operational risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Management and operational risk: There is no guarantee that the investment techniques, analyses, or judgments that the Investment Manager applies in making investment decisions for the fund will produce the intended outcome or that the investments selected for the fund will perform as well as other securities that were not selected for the fund. The Investment Manager, or the fund’s other service providers, may experience disruptions or operating errors that could negatively impact the fund.
Fixed income investments risk [Member]
Prospectus [Line Items]
Risk [Text Block]	Fixed income investments risk: The risks associated with fixed income investments include interest rate risk, which is the risk that the value of the fund’s investments is likely to fall if interest rates rise. Fixed income investments are also subject to credit risk, which is the risk that issuers of the fund’s investments may default on payment of interest or principal. Fixed income investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term fixed income securities, and credit risk is generally greater for below-investment-grade fixed income securities, which can be more sensitive to changes in markets, credit conditions, and interest rates, and may be considered speculative.
Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	It is important to understand that you can lose money by investing in the fund.
Risk Not Insured [Member]
Prospectus [Line Items]
Risk [Text Block]	An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

S000094549 [Member] Investment Risks - Franklin California Municipal Income ETF

Sep. 30, 2025

Tax-exempt investments risk: Since the fund invests in tax-exempt bonds, which, to be treated as tax-exempt under the Internal Revenue Code of 1986, as amended, may be issued only by limited types of issuers for limited types of projects, the fund’s investments may be focused in certain market segments. Consequently, the fund may be more vulnerable to fluctuations in the values of the securities it holds than a fund that invests more broadly. The fund’s performance will be closely tied to the economic and political conditions in California, and can be more volatile than the performance of a more geographically diversified fund. To the extent the fund invests in securities of issuers located outside of California, the fund may also be exposed to the risks affecting other states. Certain provisions of the California Constitution and state statutes limit the taxing and spending authority of California’s government entities, which could impair the ability of California issuers to pay principal and/or interest on their obligations. Interest the fund receives might be taxable.

Prospectus [Line Items]

Risk [Text Block]

Prepayment risk: If an issuer calls or redeems an investment during a time of declining interest rates, the fund may have to reinvest the proceeds in an investment offering a lower yield.

Fluctuation of net asset value and share price risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Fluctuation of net asset value and share price risk: Shares may trade at a larger premium or discount to the fund’s net asset value than shares of other ETFs. The net asset value of the fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s shares can be bought and sold in the secondary market at market prices. Disruptions to creations and redemptions, the existence of extreme market volatility or potential lack of an active trading market for the fund’s shares may result in the fund’s shares trading significantly above (at a premium) or below (at a discount) net asset value or the intraday value of the fund’s holdings. In addition, in stressed market conditions or periods of market disruption or volatility, the market for fund shares may become less liquid in response to deteriorating liquidity in the markets for the fund’s underlying portfolio holdings.

Trading issues risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Trading issues risk: The fund has limited trading history. There can be no assurance that an active trading market will develop or be maintained or that the market for fund shares will operate as intended, which could lead to the fund’s shares trading at wider spreads and larger premiums and discounts to net asset value than other actively managed ETFs. As a result, it may cost investors more to trade fund shares than shares of other ETFs. There is no guarantee that the fund will be able to attract market makers and authorized participants. Market makers and authorized participants are not obligated to make a market in the fund’s shares or to submit purchase and redemption orders for creation units.

The market prices of the fund’s shares are expected to fluctuate, in some cases materially, in response to changes in the fund’s net asset value, the intraday value of the fund’s holdings and supply and demand for the fund’s shares. The Investment Manager cannot predict whether the fund’s shares will trade above, below or at their net asset value or the intraday value of the fund’s holdings. During periods when the fund is trading below its net asset value, investors may incur significant losses if they sell shares.

The securities held by the fund may be traded in markets that close at a different time than the exchange on which the fund’s shares are listed. Liquidity in those securities may be reduced after the applicable closing times. Accordingly, during the time when the exchange is open but after the applicable market closing, fixing or settlement times, bid-ask spreads on the exchange and the corresponding premium or discount to the shares’ net asset value may widen.

Large shareholder transaction risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Large shareholder transaction risk: The fund is subject to the risk that shareholders will purchase or redeem large quantities of shares of the fund. The fund may be an investment option for mutual funds that are managed by the Investment Manager and its affiliates as “funds of funds.” Additionally, other investors from time to time may make substantial investments in the fund. Such shareholders may at times be considered to control the fund. In addition, a large number of shareholders may collectively purchase or redeem fund shares in large amounts rapidly or unexpectedly. Large shareholder transactions may adversely affect the fund’s liquidity and net assets. These redemptions may also adversely affect the fund’s performance if the fund is forced to sell securities, which may also increase the fund’s brokerage costs.

Authorized participant concentration risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Authorized participant concentration risk: Only an authorized participant may engage in creation and redemption transactions directly with the fund. The fund may have a limited number of financial institutions that act as authorized participants, none of which are obligated to engage in creation and/or redemption transactions. To the extent that those authorized participants do not engage in creation and redemption orders, there may be a significantly diminished trading market for fund shares or fund shares may trade at a discount (or premium) to net asset value and possibly face trading halts and/or de-listing.

Cash transactions risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Cash transactions risk: Unlike certain ETFs, the fund may effect creations and redemptions in cash or partially in cash. Therefore, it may be required to sell portfolio securities and subsequently recognize gains on such sales that the fund might not have recognized if it were to distribute portfolio securities in-kind. As such, investments in the fund’s shares may be less tax-efficient than an investment in an ETF that distributes portfolio securities entirely in-kind.

Market risks [Member]

Prospectus [Line Items]

Risk [Text Block]

Market risk: The value of investments in the fund’s portfolio may fall or fail to rise over extended periods of time for a variety of reasons, including general economic, political or financial market conditions, investor sentiment and market perceptions, government actions, geopolitical events or changes, outbreaks of infectious illnesses or other widespread public health issues, and factors related to a specific issuer, asset class, geography, industry or sector. These and other factors may lead to increased volatility and reduced liquidity in the fund’s portfolio holdings, may negatively impact the fund’s performance, and may exacerbate other risks to which the fund is subject.

Management and operational risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Management and operational risk: There is no guarantee that the investment techniques, analyses, or judgments that the Investment Manager applies in making investment decisions for the fund will produce the intended outcome or

that the investments selected for the fund will perform as well as other securities that were not selected for the fund. The Investment Manager, or the fund’s other service providers, may experience disruptions or operating errors that could negatively impact the fund.

Fixed income investments risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Fixed income investments risk: The risks associated with fixed income investments include interest rate risk, which is the risk that the value of the fund’s investments is likely to fall if interest rates rise. Fixed income investments are also subject to credit risk, which is the risk that issuers of the fund’s investments may default on payment of interest or principal. Fixed income investments may be more susceptible to downgrades or defaults during economic downturns or other periods of economic stress. Interest rate risk is generally greater for longer-term fixed income securities, and credit risk is generally greater for below-investment-grade fixed income securities, which can be more sensitive to changes in markets, credit conditions, and interest rates, and may be considered speculative.

Risk Lose Money [Member]

Prospectus [Line Items]

Risk [Text Block]

It is important to understand that you can lose money by investing in the fund.

Risk Not Insured [Member]

Prospectus [Line Items]

Risk [Text Block]

An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.