v3.25.2
Label Element Value
Franklin Investment Grade Corporate ETF  
Risk/Return: oef_RiskReturnAbstract  
Risk/Return [Heading] oef_RiskReturnHeading Franklin Investment Grade Corporate ETF
Objective [Heading] oef_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock

A high level of current income as is consistent with prudent investing, while seeking preservation of capital.

Expense Heading [Optional Text] oef_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] oef_ExpenseNarrativeTextBlock

The following table describes the fees and expenses that you will incur if you buy, hold and sell shares of the Fund. You may also incur other fees, such as usual and customary brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and the Example that follows.

Operating Expenses Caption [Optional Text] oef_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] oef_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] oef_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate

higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 47.04% of the average value of its portfolio.

Portfolio Turnover, Rate oef_PortfolioTurnoverRate 47.04%
Expense Example [Heading] oef_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] oef_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of the period. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock

Under normal market conditions, the Fund invests at least 80% of its net assets in investment grade corporate debt securities and investments. Investment grade debt securities are securities that are rated at the time of purchase in the top four ratings categories by one or more independent rating organizations such as S&P Global Ratings (S&P®) (rated BBB- or better) or Moody’s Investors Service (Moody’s) (rated Baa3 or higher) or, if unrated, are determined to be of comparable quality by the Fund’s investment manager. Corporate issuers may include corporate or other business entities in which a sovereign or governmental agency or entity may have, indirectly or directly, an interest, including a majority or greater ownership interest. Derivatives that provide exposure to investment grade corporate debt securities may be used to satisfy the Fund’s 80% policy. The Fund invests primarily in U.S. dollar denominated corporate debt securities issued by U.S. and foreign companies. The Fund may invest in debt securities of any maturity or duration. The Fund’s focus on the credit quality of its portfolio is intended to reduce credit risk and help to preserve the Fund’s capital.

The Fund may also invest a portion of its assets in convertible securities, preferred securities (including preferred stock) and U.S. Treasury securities, and generally expects to invest a portion of its assets in cash, cash equivalents and high quality money market securities, including short-term U.S. government securities, commercial paper, repurchase agreements and affiliated or unaffiliated money market funds.

The Fund may invest up to 40% of its net assets in foreign securities, including those in developing markets, and up to 15% of its net assets in non-U.S. dollar denominated securities.

The Fund may enter into certain derivative transactions, principally currency forwards; interest rate and U.S. Treasury futures contracts; and swap agreements, including interest rate, fixed income total return, currency and credit default swaps (including credit default index swaps). The use of these derivative transactions may allow the Fund to obtain net long or short exposures to select currencies, interest rates, countries, durations or credit risks. These derivatives may be used to enhance Fund returns, increase liquidity, gain exposure to certain instruments or markets in a more efficient or less expensive way and/or hedge risks associated with its other portfolio investments.

The Fund may invest up to 15% of its net assets in collateralized debt obligations (“CDOs”), including collateralized loan obligations (“CLOs”).

In choosing investments, the Fund’s investment manager selects securities in various market sectors based on the investment manager’s assessment of changing economic, market, industry and issuer conditions. The investment manager uses a “top-down” analysis of macroeconomic trends, combined with a “bottom-up” fundamental analysis of market sectors, industries and issuers, to try to take advantage of varying sector reactions to economic events. The Fund’s portfolio is constructed by taking into account the investment manager’s desired duration and yield curve exposure, total return potential, as well as the appropriate diversification and risk profile at the issue, company and industry level. The investment manager may utilize quantitative models to evaluate investment opportunities as part of the portfolio construction process for the Fund. Quantitative models are proprietary systems that rely on mathematical computations to identify investment opportunities.

The investment manager may seek to sell a security if: (i) the security has moved beyond the investment manager’s fair value target and there has been no meaningful positive change in the company’s fundamental outlook; (ii) there has been a negative fundamental change in the issuer’s credit outlook that changes the investment manager’s view of the appropriate valuation; or (iii) the investment manager’s views on macroeconomic or sector trends or valuations have changed, making that particular issuer (or that issuer’s industry) less attractive for the Fund’s portfolio. In addition, the investment manager may sell a security that still meets the investment manager’s buy criteria if another security becomes available in the new issue or secondary market that the investment manager believes has better return potential or improves the Fund’s risk profile.

Strategy Portfolio Concentration [Text] oef_StrategyPortfolioConcentration Under normal market conditions, the Fund invests at least 80% of its net assets in investment grade corporate debt securities and investments.
Bar Chart and Performance Table [Heading] oef_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] oef_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance from year to year. The table shows how the Fund's average annual returns for 1 year, 5 years, 10 years or since inception, as applicable, compared with those of a broad measure of market performance and an additional index with characteristics relevant to the Fund. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You can obtain updated performance information at www.franklintempleton.com or by calling (800) DIAL BEN/342-5236.

Performance Availability Phone [Text] oef_PerformanceAvailabilityPhone (800) DIAL BEN/342-5236
Performance Availability Website Address [Text] oef_PerformanceAvailabilityWebSiteAddress franklintempleton.com
Performance Past Does Not Indicate Future [Text] oef_PerformancePastDoesNotIndicateFuture The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] oef_BarChartHeading Annual Total Returns
Bar Chart Closing [Text Block] oef_BarChartClosingTextBlock
   

Best Quarter:

2020, Q2

10.30%

Worst Quarter:

2022, Q2

-7.83%

 

As of June 30, 2025, the Fund’s year-to-date return was 4.14%.

Performance Table Heading oef_PerformanceTableHeading Average Annual Total Returns For periods ended December 31, 2024
Index No Deduction for Fees, Expenses, or Taxes [Text] oef_IndexNoDeductionForFeesExpensesTaxes (index reflects no deduction for fees, expenses or taxes)
Franklin Investment Grade Corporate ETF | Principal Risks  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Principal Risks

You could lose money by investing in the Fund. ETF shares are not deposits or obligations of, or guaranteed or endorsed by, any bank, and are not insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board, or any other agency of the U.S. government. The Fund is subject to the principal risks noted below, any of which may adversely affect the Fund’s net asset value (NAV), trading price, yield, total return and ability to meet its investment goal. Unlike many ETFs, the Fund is not an index-based ETF.

Franklin Investment Grade Corporate ETF | Risk Lose Money [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock You could lose money by investing in the Fund.
Franklin Investment Grade Corporate ETF | Credit  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Credit: An issuer of debt securities may fail to make interest payments or repay principal when due, in whole or in part. Changes in an issuer's financial strength or in a security's or government's credit rating may affect a security's value.

Franklin Investment Grade Corporate ETF | Interest Rate  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Interest Rate: When interest rates rise, debt security prices generally fall. The opposite is also generally true: debt security prices rise when interest rates fall.

Interest rate changes are influenced by a number of factors, including government policy, monetary policy, inflation expectations, perceptions of risk, and supply of and demand for bonds. In general, securities with longer maturities or durations are more sensitive to interest rate changes.

Franklin Investment Grade Corporate ETF | Market  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Market: The market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly or unpredictably. The market value of a security or other investment may be reduced by market activity or other results of supply and demand unrelated to the issuer. This is a basic risk associated with all investments. When there are more sellers than buyers, prices tend to fall. Likewise, when there are more buyers than sellers, prices tend to rise. In addition, the value of the Fund’s investments may go up or down due to general market or other conditions that are not specifically related to a particular issuer, such as: real or perceived adverse economic changes, including widespread liquidity issues and defaults in one or more industries; changes in interest, inflation or exchange rates; unexpected natural and man-made world events, such as diseases or disasters; financial, political or social disruptions, including terrorism and war; and U.S. trade disputes or other disputes with specific countries that could result in additional tariffs, trade barriers and/or investment restrictions in certain securities in those countries. Any of these conditions can adversely affect the economic prospects of many companies, sectors, nations, regions and the market in general, in ways that cannot necessarily be foreseen.

Franklin Investment Grade Corporate ETF | Income  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Income: The Fund's distributions to shareholders may decline when prevailing interest rates fall, when the Fund experiences defaults on debt securities it holds or when the Fund realizes a loss upon the sale of a debt security.

Franklin Investment Grade Corporate ETF | Foreign Securities (non-U.S.)  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Foreign Securities (non-U.S.): Investing in foreign securities typically involves different risks than investing in U.S. securities, and includes risks associated with: (i) internal and external political and economic developments – e.g., the political, economic and social policies and structures of some foreign countries may be less stable and more volatile than those in the U.S. or some foreign countries may be subject to trading restrictions or economic sanctions; diplomatic and political developments could affect the economies, industries, and securities and currency markets of the countries in which the Fund is invested, which can include rapid and adverse political changes; social instability; regional conflicts; sanctions imposed by the United States, other nations or other governmental entities, including supranational entities; terrorism; and war; (ii) trading practices – e.g., government supervision and regulation of foreign securities and currency markets, trading systems and brokers may be less than in the U.S.; (iii) availability of information – e.g., foreign issuers may not be subject to the same disclosure, accounting and financial reporting standards and practices as U.S. issuers; (iv) limited markets – e.g., the securities of certain foreign issuers may be less liquid (harder to sell) and more volatile; and (v) currency exchange rate fluctuations and policies – e.g.,

fluctuations may negatively affect investments denominated in foreign currencies and any income received or expenses paid by the Fund in that foreign currency. The risks of foreign investments may be greater in developing or emerging market countries.

Franklin Investment Grade Corporate ETF | Extension  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Extension: Some debt securities are subject to the risk that the debt security’s effective maturity is extended because calls or prepayments are less or slower than anticipated, particularly when interest rates rise. The market value of such security may then decline and become more interest rate sensitive.

Franklin Investment Grade Corporate ETF | Derivative Instruments  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Derivative Instruments: The performance of derivative instruments depends largely on the performance of an underlying instrument, such as a currency, security, interest rate or index, and such instruments often have risks similar to their underlying instrument, in addition to other risks. Derivative instruments involve costs and can create economic leverage in the Fund's portfolio which may result in significant volatility and cause the Fund to participate in losses (as well as gains) in an amount that exceeds the Fund's initial investment. Other risks include illiquidity, mispricing or improper valuation of the derivative instrument, and imperfect correlation between the value of the derivative and the underlying instrument so that the Fund may not realize the intended benefits. When a derivative is used for hedging, the change in value of the derivative may also not correlate specifically with the currency, security, interest rate or other risk being hedged. With over-the-counter derivatives, there is the risk that the other party to the transaction will fail to perform.

Franklin Investment Grade Corporate ETF | Collateralized Debt Obligations (CDOs)  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Collateralized Debt Obligations (CDOs): The risks of an investment in a CDO, a type of asset backed security, and which includes CLOs, depend largely on the type of collateral held by the special purpose entity (SPE) and the tranche of the CDO in which the Fund invests and may be affected by the performance of a CDO's collateral manager. CDOs may be deemed to be illiquid and subject to the Fund’s restrictions on investments in illiquid investments. In addition to the normal risks associated with debt securities and asset backed securities (e.g., interest rate risk, credit risk and default risk), CDOs carry additional risks including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or quality or go into default or be downgraded; (iii) the Fund may invest in tranches of a CDO that are subordinate to other classes; and (iv) the complex structure of the security may not be fully understood at the time of investment. These risks are amplified in tranches of CDOs that are subordinate to other tranches.

Franklin Investment Grade Corporate ETF | Convertible Securities  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Convertible Securities: Convertible securities are subject to the risks of stocks when the underlying stock price is high relative to the conversion price (because more of the security's value resides in the conversion feature) and debt securities when the underlying stock price is low relative to the conversion price (because the

conversion feature is less valuable). The value of convertible securities may rise and fall with the market value of the underlying stock or, like a debt security, vary with changes in interest rates and the credit quality of the issuer. A convertible security is not as sensitive to interest rate changes as a similar non-convertible debt security, and generally has less potential for gain or loss than the underlying stock.

Franklin Investment Grade Corporate ETF | Management  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Management: The Fund is subject to management risk because it is an actively managed ETF. The Fund's investment manager applies investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these decisions will produce the desired results.

Franklin Investment Grade Corporate ETF | Cybersecurity  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Cybersecurity: Cybersecurity incidents, both intentional and unintentional, may allow an unauthorized party to gain access to Fund assets, Fund or customer data (including private shareholder information), or proprietary information, cause the Fund, the investment manager, authorized participants, or index providers (as applicable) and listing exchanges, and/or their service providers (including, but not limited to, Fund accountants, custodians, sub-custodians, transfer agents and financial intermediaries) to suffer data breaches, data corruption or loss of operational functionality or prevent Fund investors from purchasing, redeeming shares or receiving distributions. The investment manager has limited ability to prevent or mitigate cybersecurity incidents affecting third party service providers, and such third party service providers may have limited indemnification obligations to the Fund or the investment manager. Cybersecurity incidents may result in financial losses to the Fund and its shareholders, and substantial costs may be incurred in an effort to prevent or mitigate future cybersecurity incidents. Issuers of securities in which the Fund invests are also subject to cybersecurity risks, and the value of these securities could decline if the issuers experience cybersecurity incidents.

Because technology is frequently changing, new ways to carry out cyber attacks are always developing. Therefore, there is a chance that some risks have not been identified or prepared for, or that an attack may not be detected, which puts limitations on the Fund's ability to plan for or respond to a cyber attack. Like other funds and business enterprises, the Fund, the investment manager, and their service providers are subject to the risk of cyber incidents occurring from time to time.

Franklin Investment Grade Corporate ETF | Quantitative Models  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Quantitative Models: The quantitative models that may be used by the investment manager as part of the Fund’s portfolio construction process to evaluate investment opportunities have been tested on historical price data. These models are based on the assumption that price movements in most markets display similar patterns. There is the risk that market behavior will change and that the patterns upon which the forecasts in the models are based will weaken or disappear, which would reduce the ability of the models to generate an excess return. Further, as

market dynamics shift over time, a previously highly successful model may become outdated, perhaps without the investment manager recognizing that fact before substantial losses are incurred. Successful operation of a model is also reliant upon the information technology systems of the investment manager and its ability to ensure those systems remain operational and that appropriate disaster recovery procedures are in place. There can be no assurance that the investment manager will be successful in maintaining effective and operational quantitative models and the related hardware and software systems.

Franklin Investment Grade Corporate ETF | Cash/Cash Equivalents  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Cash/Cash Equivalents: To the extent the Fund holds cash or cash equivalents rather than securities in which it primarily invests or uses to manage risk, the Fund may not achieve its investment objectives and may underperform.

Franklin Investment Grade Corporate ETF | Market Trading  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Market Trading: The Fund faces numerous market trading risks, including the potential lack of an active market for Fund shares, losses from trading in secondary markets, periods of high volatility and disruption in the creation/redemption process of the Fund. Any of these factors, among others, may lead to the Fund’s shares trading at a premium or discount to NAV. Thus, you may pay more (or less) than NAV when you buy shares of the Fund in the secondary market, and you may receive less (or more) than NAV when you sell those shares in the secondary market. The investment manager cannot predict whether shares will trade above (premium), below (discount) or at NAV.

To the extent that the underlying securities held by the Fund trade on an exchange that is closed when the securities exchange on which the Fund shares list and trade is open, there may be market uncertainty about the stale security pricing (i.e., the last quote from its closed foreign market) resulting in premiums or discounts to NAV that may be greater than those experienced by other ETFs.

Franklin Investment Grade Corporate ETF | Authorized Participant Concentration  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Authorized Participant Concentration: Only an Authorized Participant may engage in creation or redemption transactions directly with the Fund. "Authorized Participants" are broker-dealers that are permitted to create and redeem shares directly with the Fund and who have entered into agreements with the Fund’s distributor. The Fund has a limited number of institutions that act as Authorized Participants. To the extent that these institutions exit the business or are unable to proceed with creation and/or redemption orders with respect to the Fund and no other Authorized Participant is able to step forward to create or redeem Creation Units (as defined below), Fund shares may trade at a discount to NAV and possibly face trading halts and/or delisting. This risk may be more pronounced in volatile markets, potentially where there are significant redemptions in ETFs generally.

Franklin Investment Grade Corporate ETF | Large Shareholder  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Large Shareholder: Certain large shareholders, including other funds or accounts advised by the investment manager or an affiliate of the investment manager, may from time to time own a substantial amount of the Fund’s shares. In addition, a third-party investor, the investment manager or an affiliate of the investment

manager, an authorized participant, a lead market maker, or another entity may invest in the Fund and hold its investment for a limited period of time solely to facilitate commencement of the Fund or to facilitate the Fund’s achieving a specified size or scale. There can be no assurance that any large shareholder would not redeem its investment, that the size of the Fund would be maintained at such levels or that the Fund would continue to meet applicable listing requirements. Redemptions by large shareholders could have a significant negative impact on the Fund. In addition, transactions by large shareholders may account for a large percentage of the trading volume on the listing exchange and may, therefore, have a material upward or downward effect on the market price of the shares.

Franklin Investment Grade Corporate ETF | Bloomberg U.S. Aggregate Index  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Bloomberg U.S. Aggregate Index
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.25%
Average Annual Return, Percent oef_AvgAnnlRtrPct (0.33%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.88% [1]
Performance Inception Date oef_PerfInceptionDate Oct. 03, 2016
Franklin Investment Grade Corporate ETF | Bloomberg U.S. Corporate - Investment Grade Index  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Bloomberg U.S. Corporate - Investment Grade Index
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.13%
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.30%
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.95% [1]
Performance Inception Date oef_PerfInceptionDate Oct. 03, 2016
Franklin Investment Grade Corporate ETF | Franklin Investment Grade Corporate ETF  
Risk/Return: oef_RiskReturnAbstract  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.35%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.00%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.35%
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 36
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 113
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 197
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 443
Year to Date Return, Label [Optional Text] oef_YearToDateReturnLabel As of June 30, 2025, the Fund’s year-to-date return was 4.14%.
Bar Chart, Year to Date Return, Date oef_BarChartYearToDateReturnDate Jun. 30, 2025
Bar Chart, Year to Date Return oef_BarChartYearToDateReturn 4.14%
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 10.30%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (7.83%)
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return before taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.20%
Average Annual Return, Percent oef_AvgAnnlRtrPct (0.07%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.62% [1]
Annual Return [Percent] oef_AnnlRtrPct 6.12%
Annual Return [Percent] oef_AnnlRtrPct (3.07%)
Annual Return [Percent] oef_AnnlRtrPct 14.80%
Annual Return [Percent] oef_AnnlRtrPct 9.94%
Annual Return [Percent] oef_AnnlRtrPct (1.82%)
Annual Return [Percent] oef_AnnlRtrPct (16.17%)
Annual Return [Percent] oef_AnnlRtrPct 7.77%
Annual Return [Percent] oef_AnnlRtrPct 2.20%
Performance Inception Date oef_PerfInceptionDate Oct. 03, 2016
Franklin Investment Grade Corporate ETF | Franklin Investment Grade Corporate ETF | After Taxes on Distributions  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return after taxes on distributions
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.32%
Average Annual Return, Percent oef_AvgAnnlRtrPct (1.59%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.12% [1]
Performance Inception Date oef_PerfInceptionDate Oct. 03, 2016
Franklin Investment Grade Corporate ETF | Franklin Investment Grade Corporate ETF | After Taxes on Distributions and Sales  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return after taxes on distributions and sale of Fund shares
Average Annual Return, Percent oef_AvgAnnlRtrPct 1.29%
Average Annual Return, Percent oef_AvgAnnlRtrPct (0.66%)
Average Annual Return, Percent oef_AvgAnnlRtrPct 0.61% [1]
Performance Inception Date oef_PerfInceptionDate Oct. 03, 2016
[1]

Since inception October 3, 2016.