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    <rr:ObjectiveHeading contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         Investment Goal

</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         To maximize total return, consistent with reasonable risk, by seeking to optimize capital appreciation and high current income
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</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         Fees and Expenses of the Fund

</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">                  These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $50,000 in Franklin Templeton funds. More information about these and other discounts is available from your financial professional and under &#x93;Your Account&#x94; on page 87 in the Fund's Prospectus and under &#x93;Buying and Selling Shares&#x94; on page 81  of the Fund&#x92;s
            Statement of Additional Information. In addition, more information about sales charge discounts and waivers for purchases
            of shares through specific financial intermediaries is set forth in Appendix A - "Intermediary Sales Charge Discounts and
            Waivers" to the Fund's prospectus.

                  Please note that the tables and examples below do not reflect any transaction fees that may be charged by financial intermediaries,
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            R6 or Advisor Class shares.


</rr:ExpenseNarrativeTextBlock>
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      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302071_11"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0100</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:OperatingExpensesCaption contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         Annual Fund Operating Expenses
                  (expenses that you pay each year as a percentage of the value of your investment)

</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0046</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0046</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0046</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0046</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0012</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0012</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0008</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0012</rr:OtherExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_27"
      unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_28"
      unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_29"
      unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_30"
      unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0084</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0159</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0055</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0059</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_35"
      unitRef="pure">-0</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_36"
      unitRef="pure">-0</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_37"
      unitRef="pure">-0.0004</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_38"
      unitRef="pure">-0</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_39"
      unitRef="pure">0.0084</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_40"
      unitRef="pure">0.0159</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_41"
      unitRef="pure">0.0051</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302080_42"
      unitRef="pure">0.0059</rr:NetExpensesOverAssets>
    <rr:ExpenseExampleHeading contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         Example

</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual
            funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem 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. The Example reflects adjustments made to the Fund's operating expenses due to the fee
            waivers and/or expense reimbursements by management for the 1 Year numbers only. Although your actual costs may be higher
            or lower, based on these assumptions your costs would be:


</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">631</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">803</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">990</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1530</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">262</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">502</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">866</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1889</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">52</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">172</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">303</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006851_C000141439_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">685</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">60</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">189</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">329</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006851_C000064442_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">738</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleNoRedemptionByYearCaption contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">If you do not sell your shares:</rr:ExpenseExampleNoRedemptionByYearCaption>
    <rr:ExpenseExampleNoRedemptionYear01
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">162</rr:ExpenseExampleNoRedemptionYear01>
    <rr:ExpenseExampleNoRedemptionYear03
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">502</rr:ExpenseExampleNoRedemptionYear03>
    <rr:ExpenseExampleNoRedemptionYear05
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">866</rr:ExpenseExampleNoRedemptionYear05>
    <rr:ExpenseExampleNoRedemptionYear10
      contextRef="S000006851_C000018512_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1889</rr:ExpenseExampleNoRedemptionYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">Portfolio Turnover

</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         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 32.46% of the average value of its portfolio.


</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.3246</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         Principal Investment Strategies

</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">                                             Under normal market conditions, the Fund invests at least 80% of its net assets in convertible securities (and common stock
               received upon conversion of convertible securities).  A convertible security is generally a debt security or preferred stock that may be converted within a specified period of
            time into common stock of the same or a different issuer. By investing in convertible securities, the Fund seeks the opportunity
            to participate in the capital appreciation of underlying stocks, while at the same time relying on the fixed income aspect
            of the convertible securities to provide current income and reduced price volatility, which can limit the risk of loss in
            a down equity market.

                  A convertible security shares features of both equity and debt securities. Like an equity security, the value of a convertible
            security tends to increase as the price of the underlying stock goes up, and to decrease as the price of the underlying stock
            goes down. Like a debt security, a convertible security provides a fixed income stream and also tends to increase in value
            when interest rates fall and decrease in value when interest rates rise.

                  When choosing convertible securities for this Fund, the investment manager attempts to maintain a balance in the portfolio
            between the equity and debt characteristics of convertible securities with an emphasis on the equity features. The investment
            manager also considers the company&#x92;s long-term earnings, asset value and cash flow potential. Some of the convertible
            securities in which the Fund may invest have been structured to provide enhanced yield, increased equity exposure, or enhanced
            downside protection. These securities, generally referred to as enhanced convertible securities, typically provide a benefit
            to the issuer in exchange for the enhanced features, such as a conversion premium that is paid by the Fund. The Fund may invest
            in convertible securities of companies of any capitalization size, but generally seeks to make its portfolio representative
            of the entire convertible securities market.

                  Convertible securities generally fall within the lower-rated categories as determined by securities rating agencies. Therefore,
            the Fund may invest up to 100% of its assets in securities that are rated below investment grade; however, the Fund will not
            invest more than 10% of its assets in non-convertible debt securities rated below B by an independent rating agency such as
            Standard &amp; Poor's or Moody's Investors Service. The Fund may invest up to 20% of its net assets in other securities, such
            as common or preferred stocks and non-convertible debt securities. The Fund currently intends to limit its investments in
            foreign securities to 25% or less of its total assets.

                  While the Fund does not concentrate in any one industry, from time to time, based on economic conditions, it may make significant
            investments in certain sectors such as technology, consumer discretionary and health care.


</rr:StrategyNarrativeTextBlock>
    <rr:StrategyPortfolioConcentration contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">Under normal market conditions, the Fund invests at least 80% of its net assets in convertible securities (and common stock
               received upon conversion of convertible securities).</rr:StrategyPortfolioConcentration>
    <rr:RiskHeading contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         Principal Risks

</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">                  You could lose money by investing in the Fund. Mutual fund 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.

                  Convertible Securities&#160;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).  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.

         Market&#160;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.

         The current global outbreak of the novel strain of coronavirus, COVID-19, has resulted in market closures and dislocations,
            extreme volatility, liquidity constraints and increased trading costs. Efforts to contain the spread of COVID-19 have resulted
            in global travel restrictions and disruptions of healthcare systems, business operations and supply chains, layoffs, reduced
            consumer demand, defaults and credit ratings downgrades, and other significant economic impacts. The effects of COVID-19 have
            impacted global economic activity across many industries and may heighten other pre-existing political, social and economic
            risks, locally or globally. The full impact of the COVID-19 pandemic is unpredictable and may adversely affect the Fund&#x92;s
            performance.

         Stock prices tend to go up and down more dramatically than those of debt securities. A slower-growth or recessionary economic
            environment could have an adverse effect on the prices of the various stocks held by the Fund.

         Credit&#160;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.

         High-Yield Debt Securities&#160;Issuers of lower-rated or &#x93;high-yield&#x94; debt securities (also known as &#x93;junk bonds&#x94;) are not as strong
            financially as those issuing higher credit quality debt securities. High-yield debt securities are generally considered predominantly
            speculative by the applicable rating agencies as their issuers are more likely to encounter financial difficulties because
            they may be more highly leveraged, or because of other considerations. In addition, high yield debt securities generally are
            more vulnerable to changes in the relevant economy, such as a recession or a sustained period of rising interest rates, that
            could affect their ability to make interest and principal payments when due. The prices of high-yield debt securities generally
            fluctuate more than those of higher credit quality. High-yield debt securities are generally more illiquid (harder to sell)
            and harder to value.

         Liquidity&#160;From time to time, the trading market for a particular security or type of security or other investments in which the Fund
            invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the Fund&#x92;s ability
            to sell such securities or other investments when necessary to meet the Fund&#x92;s liquidity needs, which may arise or increase
            in response to a specific economic event or because the investment manager wishes to purchase particular investments or believes
            that a higher level of liquidity would be advantageous. Reduced liquidity will also generally lower the value of such securities
            or other investments. Market prices for such securities or other investments may be relatively volatile.


         Income&#160;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.

         Focus&#160;To the extent that the Fund focuses on particular countries, regions, industries, sectors or types of investment from time
            to time, the Fund may be subject to greater risks of adverse developments in such areas of focus than a fund that invests
            in a wider variety of countries, regions, industries, sectors or investments.

         Technology Companies&#160;The Fund may focus in the technology sector.  The technology sector has historically been volatile due to the rapid pace of
            product change and development within the sector. Companies in the technology sector may be affected by worldwide technological
            developments, the success of their products and services (which may be outdated quickly), anticipated products or services
            that are delayed or cancelled, and investor perception of the company and/or its products or services. Technology companies
            may also be affected by legislation or changes in government regulation and policies.

         Consumer Discretionary Companies&#160;By focusing its investments in financials related industries, the Fund carries much greater risks of adverse developments
            and price movements in such industries than a fund that invests in a wider variety of industries. Because the Fund concentrates
            in a specific industry or group of industries, there is also the risk that the Fund will perform poorly during a slump in
            demand for securities of companies in such industries.

         Healthcare Companies&#160;The activities of healthcare companies may be funded or subsidized by federal and state governments. If government funding
            and subsidies are reduced or discontinued, the profitability of these companies could be adversely affected. Healthcare companies
            may also be affected by government policies on healthcare reimbursements, regulatory approval for new drugs and medical products,
            and similar matters. They are also subject to legislative risk, i.e., the risks associated with the reform of the healthcare
            system through legislation.

         Smaller and Mid-Capitalization Companies&#160;Securities issued by smaller and mid-capitalization companies may be more volatile in price than those of larger companies,
            involve substantial risks and should be considered speculative. Such risks may include greater sensitivity to economic conditions,
            less certain growth prospects, and lack of depth of management and funds for growth and development. They may also have limited
            product lines or be developing or marketing new products or services for which markets are not yet established and may never
            become established. In addition, smaller and mid-capitalization companies may be particularly affected by interest rate increases,
            as they may find it more difficult to borrow money to continue or expand operations, or may have difficulty in repaying any
            loans.

         Foreign Securities (non-U.S.)&#160;Investing in foreign securities typically involves more risks than investing in U.S. securities, including risks related to
            currency exchange rates and policies, country or government specific issues, less favorable trading practices or regulation
            and greater price volatility. Certain of these risks also may apply to securities of U.S. companies with significant foreign
            operations.

         Interest Rate&#160;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.

         Management&#160;The Fund is subject to management risk because it is an actively managed investment portfolio. 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.


</rr:RiskNarrativeTextBlock>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         Performance

</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">                  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 for Class A shares. 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. 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 franklintempleton.com or by calling (800) DIAL BEN/342-5236.

                  Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">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 for Class A shares. 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.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the
               future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">franklintempleton.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityPhone contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">(800) DIAL BEN/342-5236</rr:PerformanceAvailabilityPhone>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartHeading contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         Class A Annual Total Returns

</rr:BarChartHeading>
    <rr:HighestQuarterlyReturnLabel contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.3301</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="S000006851_C000018511_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">-0.1612</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">         Average Annual Total Returns(figures reflect sales charges)

                  For the periods ended December 31, 2020

</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnLabel contextRef="S000006851_C000018511_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006851_C000018511_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.3818</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006851_C000018511_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1779</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006851_C000018511_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1214</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006851_C000018511_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006851_C000018511_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.3425</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006851_C000018511_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1508</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006851_C000018511_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1012</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006851_C000018511_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006851_C000018511_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.2449</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006851_C000018511_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1327</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006851_C000018511_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0909</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006851_C000018512_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.4414</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006851_C000018512_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1823</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006851_C000018512_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1194</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006851_C000141439_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.4674</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006851_C000141439_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1956</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnSinceInception
      contextRef="S000006851_C000141439_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302277_111"
      unitRef="pure">0.1405</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006851_C000064442_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.4660</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006851_C000064442_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1943</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006851_C000064442_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1306</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006851_IndexBM2634_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.3937</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006851_IndexBM2634_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1698</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006851_IndexBM2634_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1244</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock contextRef="S000006851_FranklinInvestorsSecuritiesTrustFIST132Member">                  The figures in the average annual total returns table above reflect the Class A maximum front-end sales charge of 5.50%. Prior
            to September 10, 2018, Class A shares were subject to a maximum front-end sales charge of 5.75%. If the prior maximum front-end
            sales charge of 5.75% was reflected, performance for Class A in the average annual total returns table would be lower.

                  The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not
            reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ
            from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements,
            such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class A and after-tax returns
            for other classes will vary.


</rr:PerformanceTableClosingTextBlock>
    <rr:ObjectiveHeading contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         Investment Goal

</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         To maximize total return by emphasizing high current income and long-term capital appreciation, consistent with reasonable
            risk.


</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         Fees and Expenses of the Fund

</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">                  These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $50,000 in Franklin Templeton funds. More information about these and other discounts is available from your financial professional and under &#x93;Your Account&#x94; on page 87 in the Fund's Prospectus and under &#x93;Buying and Selling Shares&#x94; on page 81  of the Fund&#x92;s
            Statement of Additional Information. In addition, more information about sales charge discounts and waivers for purchases
            of shares through specific financial intermediaries is set forth in Appendix A - "Intermediary Sales Charge Discounts and
            Waivers" to the Fund's prospectus.

                  Please note that the tables and examples below do not reflect any transaction fees that may be charged by financial intermediaries,
            or commissions that a shareholder may be required to pay directly to its financial intermediary when buying or selling Class
            R6 or Advisor Class shares.


</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseBreakpointDiscounts contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $50,000 in Franklin Templeton funds.</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">50000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:ShareholderFeesCaption contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">Shareholder Fees (fees paid directly from your investment)

</rr:ShareholderFeesCaption>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0550</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302407_129"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0100</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:OperatingExpensesCaption contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         Annual Fund Operating Expenses
                  (expenses that you pay each year as a percentage of the value of your investment)

</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0046</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0046</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_136"
      unitRef="pure">0.0046</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0046</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0046</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_141"
      unitRef="pure">0.0050</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0015</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0015</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_146"
      unitRef="pure">0.0015</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0006</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0015</rr:OtherExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0086</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0161</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_151"
      unitRef="pure">0.0111</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0052</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0061</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_154"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_155"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_156"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_157"
      unitRef="pure">-0.0002</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_158"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_159"
      unitRef="pure">0.0085</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_160"
      unitRef="pure">0.0160</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_161"
      unitRef="pure">0.0110</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_162"
      unitRef="pure">0.0050</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302416_163"
      unitRef="pure">0.0060</rr:NetExpensesOverAssets>
    <rr:ExpenseExampleHeading contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         Example

</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual
            funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem 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. The Example reflects adjustments made to the Fund's operating expenses due to the fee
            waivers and/or expense reimbursements by management for the 1 Year numbers only. Although your actual costs may be higher
            or lower, based on these assumptions your costs would be:


</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">632</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">808</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1000</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1552</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">263</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">507</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">875</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1911</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">112</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">352</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">611</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006852_C000018516_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1351</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">51</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">165</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">289</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006852_C000128878_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">651</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">61</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">194</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">339</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006852_C000064443_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">761</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleNoRedemptionByYearCaption contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">If you do not sell your shares:</rr:ExpenseExampleNoRedemptionByYearCaption>
    <rr:ExpenseExampleNoRedemptionYear01
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">163</rr:ExpenseExampleNoRedemptionYear01>
    <rr:ExpenseExampleNoRedemptionYear03
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">507</rr:ExpenseExampleNoRedemptionYear03>
    <rr:ExpenseExampleNoRedemptionYear05
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">875</rr:ExpenseExampleNoRedemptionYear05>
    <rr:ExpenseExampleNoRedemptionYear10
      contextRef="S000006852_C000018515_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1911</rr:ExpenseExampleNoRedemptionYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">Portfolio Turnover

</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         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 26.90% of the average value of its portfolio.


</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.2690</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         Principal Investment Strategies

</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">                                    The Fund normally invests at least 80% of its net assets in equity securities, including securities convertible into common
            stocks. The Fund generally invests predominantly in common stocks, and the remainder of its assets in other equity-related
            instruments such as convertible securities and equity-linked notes (ELNs).

                  While the Fund does not concentrate in any one industry, from time to time, based on economic conditions, it may make significant
            investments in certain sectors.

                  The Fund may invest in foreign securities, but does not currently anticipate investing more than 15% of its total assets in
            securities of issuers domiciled outside the United States.


         The Fund&#x92;s strategy is to invest in a broadly diversified portfolio of equity securities that the Fund&#x92;s investment
            manager considers to be financially strong, with a focus on "blue chip" companies. The investment manager applies a "bottom-up"
            approach to investing in individual securities. The investment manager will assess the market price of a company's securities
            relative to the investment manager's evaluation of the company's long-term earnings, cash flow potential and balance sheet
            strength. The investment manager also considers a company's price/earnings ratio, return on capital, profit margins and asset
            value. The Fund&#x92;s investment manager considers dividend yield and the opportunity for dividend growth in selecting stocks
            for the Fund because the investment manager believes that, over time, dividend income can contribute significantly to total
            return and can be a more consistent source of investment return than capital appreciation.


</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         Principal Risks

</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">                  You could lose money by investing in the Fund. Mutual fund 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.

                  Market&#160;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.

         The current global outbreak of the novel strain of coronavirus, COVID-19, has resulted in market closures and dislocations,
            extreme volatility, liquidity constraints and increased trading costs. Efforts to contain the spread of COVID-19 have resulted
            in global travel restrictions and disruptions of healthcare systems, business operations and supply chains, layoffs, reduced
            consumer demand, defaults and credit ratings downgrades, and other significant economic impacts. The effects of COVID-19 have
            impacted global economic activity across many industries and may heighten other pre-existing political, social and economic
            risks, locally or globally. The full impact of the COVID-19 pandemic is unpredictable and may adversely affect the Fund&#x92;s
            performance.

         Stock prices tend to go up and down more dramatically than those of debt securities. A slower-growth or recessionary economic
            environment could have an adverse effect on the prices of the various stocks held by the Fund.

         Income&#160;Because the Fund can only distribute what it earns, the Fund's distributions to shareholders may decline when dividend income
            from investments in stocks decline or when prevailing interest rates fall.

         Focus&#160;To the extent that the Fund focuses on particular countries, regions, industries, sectors or types of investment from time
            to time, the Fund may be subject to greater risks of adverse developments in such areas of focus than a fund that invests
            in a wider variety of countries, regions, industries, sectors or investments.

         Blend Style Investing&#160;A &#x93;blend&#x94; strategy results in investments in both growth and value stocks, or in stocks with characteristics of
            both. Growth stock prices reflect projections of future earnings or revenues and can fall dramatically if the company fails
            to meet those projections. With respect to value stocks, if other investors fail to recognize the company&#x92;s value, or
            favor investing in faster-growing companies, value stocks may not increase in value as anticipated by the Fund's investment
            manager or may decline even further.



         Equity-Linked Notes (ELNs)&#160;ELNs may not perform as expected and could cause the Fund to realize significant losses including its entire principal investment.
            Other risks include counterparty risk, liquidity risk and imperfect correlation between ELNs and the underlying securities.

         Foreign Securities (non-U.S.)&#160;Investing in foreign securities typically involves more risks than investing in U.S. securities, including risks related to
            currency exchange rates and policies, country or government specific issues, less favorable trading practices or regulation
            and greater price volatility. Certain of these risks also may apply to securities of U.S. companies with significant foreign
            operations.

         Convertible Securities&#160;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).  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.


         Interest Rate&#160;Common stocks with higher dividend yields can be sensitive to interest rate movements: when interest rates rise, the prices
            of these stocks may tend to fall. The opposite can also be true: the prices of higher yielding stocks may tend to rise when
            interest rates fall. Interest rate changes can be sudden and unpredictable and are influenced by a number of factors including
            government policy, monetary policy, inflation expectations, perceptions of risk, and supply and demand of bonds. Increases
            in interest rates may also have a negative effect on the types of companies in which the Fund normally invests because these
            companies may find it more difficult to obtain credit to expand, may have more difficulty meeting interest payments or may
            pay lower dividends due to the higher costs of borrowing.

         Credit&#160;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.


         Management&#160;The Fund is subject to management risk because it is an actively managed investment portfolio. 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.


</rr:RiskNarrativeTextBlock>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         Performance

</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">                           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 for Class A shares. 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. 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 franklintempleton.com or by calling (800) DIAL BEN/342-5236.

                  The secondary index in the table below shows how the Fund's performance compares to a group of securities that reflects the
            broader equity markets universe.

                  Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">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 for Class A shares. 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.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the
               future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">franklintempleton.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityPhone contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">(800) DIAL BEN/342-5236</rr:PerformanceAvailabilityPhone>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartHeading contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         Class A Annual Total Returns

</rr:BarChartHeading>
    <rr:HighestQuarterlyReturnLabel contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1419</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="S000006852_C000018513_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">-0.2273</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">         Average Annual Total Returns(figures reflect sales charges)

                  For the periods ended December 31, 2020

</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnLabel contextRef="S000006852_C000018513_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006852_C000018513_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">-0.0020</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006852_C000018513_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0912</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006852_C000018513_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0940</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006852_C000018513_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006852_C000018513_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">-0.0102</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006852_C000018513_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0778</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006852_C000018513_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0822</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006852_C000018513_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006852_C000018513_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0032</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006852_C000018513_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0698</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006852_C000018513_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0744</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006852_C000018515_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0380</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006852_C000018515_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0953</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006852_C000018515_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0919</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006852_C000018516_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0535</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006852_C000018516_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1012</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006852_C000018516_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0975</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006852_C000128878_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0603</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006852_C000128878_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1077</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnSinceInception
      contextRef="S000006852_C000128878_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302584_238"
      unitRef="pure">0.1032</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006852_C000064443_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0589</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006852_C000064443_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1064</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006852_C000064443_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1030</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006852_IndexBM0799_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302584_242"
      unitRef="pure">0.0280</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006852_IndexBM0799_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302584_243"
      unitRef="pure">0.0973</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006852_IndexBM0799_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302584_244"
      unitRef="pure">0.1050</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006852_IndexHB0331_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1840</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006852_IndexHB0331_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1521</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006852_IndexHB0331_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1388</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock contextRef="S000006852_FranklinInvestorsSecuritiesTrustFIST132Member">                           No one index is representative of the Fund's portfolio.
                  The figures in the average annual total returns table above reflect the Class A maximum front-end sales charge of 5.50%. Prior
            to September 10, 2018, Class A shares were subject to a maximum front-end sales charge of 5.75%. If the prior maximum front-end
            sales charge of 5.75% was reflected, performance for Class A in the average annual total returns table would be lower.

                  The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not
            reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ
            from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements,
            such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class A and after-tax returns
            for other classes will vary.


</rr:PerformanceTableClosingTextBlock>
    <rr:ObjectiveHeading contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         Investment Goal

</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         To maximize income to support monthly distributions, while maintaining the prospects for capital appreciation.

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         Fees and Expenses of the Fund

</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">                  These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $50,000 in Franklin Templeton funds. More information about these and other discounts is available from your financial professional and under &#x93;Your Account&#x94; on page 87 in the Fund's Prospectus and under &#x93;Buying and Selling Shares&#x94; on page 81  of the Fund&#x92;s
            Statement of Additional Information. In addition, more information about sales charge discounts and waivers for purchases
            of shares through specific financial intermediaries is set forth in Appendix A - "Intermediary Sales Charge Discounts and
            Waivers" to the Fund's prospectus.

                  Please note that the tables and examples below do not reflect any transaction fees that may be charged by financial intermediaries,
            or commissions that a shareholder may be required to pay directly to its financial intermediary when buying or selling Class
            R6 or Advisor Class shares.


</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseBreakpointDiscounts contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $50,000 in Franklin Templeton funds.</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">50000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:ShareholderFeesCaption contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">Shareholder Fees (fees paid directly from your investment)

</rr:ShareholderFeesCaption>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0550</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302724_259"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0100</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:OperatingExpensesCaption contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         Annual Fund Operating Expenses
                  (expenses that you pay each year as a percentage of the value of your investment)

</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0055</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0055</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0055</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0055</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0055</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0100</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0050</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0013</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0013</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0013</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0005</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0013</rr:OtherExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_279"
      unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_280"
      unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_281"
      unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_282"
      unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_283"
      unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_284"
      unitRef="pure">0.0094</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_285"
      unitRef="pure">0.0169</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_286"
      unitRef="pure">0.0119</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_287"
      unitRef="pure">0.0061</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_288"
      unitRef="pure">0.0069</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_289"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_290"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_291"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_292"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_293"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_294"
      unitRef="pure">0.0093</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_295"
      unitRef="pure">0.0168</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_296"
      unitRef="pure">0.0118</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_297"
      unitRef="pure">0.0060</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302733_298"
      unitRef="pure">0.0068</rr:NetExpensesOverAssets>
    <rr:ExpenseExampleHeading contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         Example

</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual
            funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem 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. The Example reflects adjustments made to the Fund's operating expenses due to the fee
            waivers and/or expense reimbursements by management for the 1 Year numbers only. Although your actual costs may be higher
            or lower, based on these assumptions your costs would be:


</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">640</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">832</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1041</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1641</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">271</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">532</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">917</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1999</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">120</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">377</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">654</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000012705_C000034240_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1444</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">61</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">194</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">339</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000012705_C000128884_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">762</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">69</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">220</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">383</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000012705_C000034241_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">858</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleNoRedemptionByYearCaption contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">If you do not sell your shares:</rr:ExpenseExampleNoRedemptionByYearCaption>
    <rr:ExpenseExampleNoRedemptionYear01
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">171</rr:ExpenseExampleNoRedemptionYear01>
    <rr:ExpenseExampleNoRedemptionYear03
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">532</rr:ExpenseExampleNoRedemptionYear03>
    <rr:ExpenseExampleNoRedemptionYear05
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">917</rr:ExpenseExampleNoRedemptionYear05>
    <rr:ExpenseExampleNoRedemptionYear10
      contextRef="S000012705_C000034239_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="0"
      unitRef="usd">1999</rr:ExpenseExampleNoRedemptionYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">Portfolio Turnover

</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         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 64.69% of the average value of its portfolio.


</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.6469</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         Principal Investment Strategies

</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">                                                                        Under normal market conditions, the Fund invests in a diversified portfolio of stocks (substantially dividend paying) and
               debt securities. The Fund normally invests at least 25% of its total assets in debt securities, including bonds, notes, debentures and money
            market securities. In addition, the Fund normally invests at least 25% of its total assets in equity securities, primarily
            common and preferred stock. To the extent that the value of convertible and preferred securities can be attributed to their
            debt characteristics, they will be treated as debt securities for purposes of this investment policy.

                  The Fund seeks income by investing in a combination of corporate, agency and government bonds issued in the United States
            and other countries, as well as common stocks of companies in any market capitalization range and convertible securities.
            The Fund seeks capital appreciation by investing in equity securities and convertible securities of companies from a variety
            of industries.

                  The Fund generally invests in investment grade debt securities. The Fund may invest in debt securities of any duration. The
            Fund does not currently anticipate investing more than 25% of its total assets in securities of issuers domiciled outside
            the United States.

                  The Fund also invests in equity-linked notes, which are hybrid derivative-type instruments that are specially designed to
            combine the characteristics of one or more reference securities (usually a single stock, a stock index or a basket of stocks
            (underlying securities)) and a related equity derivative, such as a put or call option, in a single note form.

                  The Fund may, from time to time, use (i) equity-related derivatives, which may include call and put options on equity securities
            and equity security indices, futures on equity securities and equity indexes and options on equity index futures, (ii) interest
            rate derivatives, including interest rate swaps and interest rate/bond futures contracts, (iii) currency derivatives, including
            forward foreign currency exchange contracts, currency futures contracts, currency swaps and currency options and (iv) credit-related
            derivatives, such as credit default swaps and options on credit default swaps for various purposes, including enhancing Fund
            returns, increasing liquidity, gaining exposure to particular instruments or markets in more efficient or less expensive ways
            and/or hedging risks. The use of such derivative transactions may allow the Fund to obtain net long or net short exposures
            to selected securities, markets, interest rates, countries, currencies, credits or durations.

                  The investment manager applies a &#x93;bottom-up&#x94; approach to investing in individual securities. The investment manager
            will assess the market price of a company&#x92;s securities relative to the investment manager&#x92;s evaluation of the company&#x92;s
            long-term earnings, asset value and cash flow potential. The investment manager also considers a company&#x92;s price/earnings
            ratio, profit margins and liquidation value. In determining an optimal mix of equity and fixed-income investments for the
            Fund, the investment manager assesses changing economic, market and industry conditions.

                  Under normal market conditions, the Fund employs a managed distribution policy that is designed to provide shareholders with
            regular distributions from their investment. Under this policy, the Fund distributes twelve level monthly payments throughout
            each calendar year to enable shareholders to estimate the distributions they will receive from the Fund; however, the twelfth
            monthly payment may be greater than the initially anticipated amount if additional income or capital gains are required to
            be distributed. The targeted annual payout rate for all share classes is between approximately 2.75% and 6.25% per share based
            on the last net asset value of the Fund of the prior calendar year in which the distribution is being made (e.g., for distributions
            made in 2021, the targeted annual payout rate for all share classes will be based on the Fund&#x92;s net asset value on December
            31, 2020). The distribution rate will vary by class based on the expenses of each class. Every year, the investment manager
            will undertake to determine if an adjustment should be made to the monthly rate.

                  It is possible to lose money by investing in the Fund notwithstanding the managed distribution policy. There can be no assurance
            or guarantee that the Fund will provide a fixed stable level of distributions at any time or over any period of time. An investment
            in the Fund could lose money over short, intermediate, or even long periods of time.


</rr:StrategyNarrativeTextBlock>
    <rr:StrategyPortfolioConcentration contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">Under normal market conditions, the Fund invests in a diversified portfolio of stocks (substantially dividend paying) and
               debt securities.</rr:StrategyPortfolioConcentration>
    <rr:RiskHeading contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         Principal Risks

</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">                  You could lose money by investing in the Fund. Mutual fund 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.

                  Market&#160;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.

         The current global outbreak of the novel strain of coronavirus, COVID-19, has resulted in market closures and dislocations,
            extreme volatility, liquidity constraints and increased trading costs. Efforts to contain the spread of COVID-19 have resulted
            in global travel restrictions and disruptions of healthcare systems, business operations and supply chains, layoffs, reduced
            consumer demand, defaults and credit ratings downgrades, and other significant economic impacts. The effects of COVID-19 have
            impacted global economic activity across many industries and may heighten other pre-existing political, social and economic
            risks, locally or globally. The full impact of the COVID-19 pandemic is unpredictable and may adversely affect the Fund&#x92;s
            performance.

         Stock prices tend to go up and down more dramatically than those of debt securities. A slower-growth or recessionary economic
            environment could have an adverse effect on the prices of the various stocks held by the Fund.

         Credit&#160;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.

         Interest Rate&#160;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.

         Managed Distribution Policy&#160;The Fund's monthly payments under the managed distribution policy may reduce the amount of assets available for investment
            by the Fund, even if the Fund's assets grow over time. In addition, the Fund may return capital to shareholders (i.e., a return
            of all or part of a shareholder's original investment). Fund shareholders are expected to receive a monthly distribution that
            is equal to a set percentage per share, which will be different per class based on differences in class expenses, multiplied
            by the number of shares owned on the record date; therefore, redemptions from a shareholder&#x92;s account will reduce future
            distributions. The managed distribution policy is not designed to generate, and is not expected to result in, distributions
            that equal a fixed percentage of the Fund's current net asset value per share or a fixed percentage of a shareholder&#x92;s
            current account value.

         Equity-Linked Notes (ELNs)&#160;ELNs may not perform as expected and could cause the Fund to realize significant losses including its entire principal investment.
            Other risks include counterparty risk, liquidity risk and imperfect correlation between ELNs and the underlying securities.

         Convertible Securities&#160;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).  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.

         Management&#160;The Fund is subject to management risk because it is an actively managed investment portfolio. 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.

         Derivative Instruments&#160;The performance of derivative instruments depends largely on the performance of an underlying instrument or factor, such as
            a currency, security, interest rate or index, and such instruments often have risks similar to the underlying instrument,
            in addition to other risks. Derivatives involve costs and can create economic leverage in the Fund&#x92;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&#x92;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, index or other risk being hedged. Derivatives also may present the
            risk that the other party to the transaction will fail to perform.

         LIBOR Transition&#160;The Fund invests in financial instruments that may have floating or variable rate calculations for payment obligations or
            financing terms based on the London Interbank Offered Rate (LIBOR), which is the benchmark interest rate at which major global
            banks lend to one another in the international interbank market for short-term loans.  It is currently anticipated that LIBOR
            will be discontinued by the end of 2021 and will cease to be published after that time (although there are initiatives to
            delay the discontinuation beyond 2021 for certain LIBOR rates).  The impact of the discontinuation of LIBOR and the transition
            to an alternative rate on the Fund&#x92;s portfolio remains uncertain.  There can be no guarantee that financial instruments
            that transition to an alternative reference rate will retain the same value or liquidity as they would otherwise have had.

         Foreign Securities (non-U.S.)&#160;Investing in foreign securities typically involves more risks than investing in U.S. securities, including risks related to
            currency exchange rates and policies, country or government specific issues, less favorable trading practices or regulation
            and greater price volatility. Certain of these risks also may apply to securities of U.S. companies with significant foreign
            operations.





</rr:RiskNarrativeTextBlock>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         Performance

</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">                           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 for Class A shares. 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. 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 franklintempleton.com or by calling (800) DIAL BEN/342-5236.

                  The secondary index in the table below shows how the Fund's performance compares to a group of securities that aligns with
            the fixed-income component of the Fund's portfolio. The blended index in the table below shows how the Fund's performance
            compares with groups of securities in approximately the same asset class allocations as the Fund.

                  Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">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 for Class A shares. 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.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the
               future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">franklintempleton.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityPhone contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">(800) DIAL BEN/342-5236</rr:PerformanceAvailabilityPhone>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartHeading contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         Class A Annual Total Returns

</rr:BarChartHeading>
    <rr:HighestQuarterlyReturnLabel contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0974</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="S000012705_C000034238_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">-0.1337</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">         Average Annual Total Returns(figures reflect sales charges)

                  For the periods ended December 31, 2020

</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnLabel contextRef="S000012705_C000034238_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000012705_C000034238_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">-0.0037</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000012705_C000034238_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0689</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000012705_C000034238_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0670</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000012705_C000034238_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000012705_C000034238_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">-0.0185</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000012705_C000034238_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0526</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000012705_C000034238_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0530</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000012705_C000034238_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000012705_C000034238_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0008</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000012705_C000034238_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0490</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000012705_C000034238_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0492</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000012705_C000034239_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0360</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000012705_C000034239_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0729</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000012705_C000034239_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0654</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000012705_C000034240_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0514</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000012705_C000034240_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0782</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000012705_C000034240_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0708</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000012705_C000128884_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0570</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000012705_C000128884_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0848</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnSinceInception
      contextRef="S000012705_C000128884_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      id="id_footnote_elem_221302906_374"
      unitRef="pure">0.0714</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnYear01
      contextRef="S000012705_C000034241_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0562</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000012705_C000034241_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0836</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000012705_C000034241_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0761</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000012705_IndexHB0331_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1840</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000012705_IndexHB0331_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1521</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000012705_IndexHB0331_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.1388</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000012705_IndexBM0838_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0751</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000012705_IndexBM0838_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0443</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000012705_IndexBM0838_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0384</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000012705_IndexHB10266_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0550</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000012705_IndexHB10266_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0859</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000012705_IndexHB10266_FranklinInvestorsSecuritiesTrustFIST132Member"
      decimals="4"
      unitRef="pure">0.0868</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock contextRef="S000012705_FranklinInvestorsSecuritiesTrustFIST132Member">                           No one index is representative of the Fund's portfolio.
                  The figures in the average annual total returns table above reflect the Class A maximum front-end sales charge of 5.50%. Prior
            to September 10, 2018, Class A shares were subject to a maximum front-end sales charge of 5.75%. If the prior maximum front-end
            sales charge of 5.75% was reflected, performance for Class A in the average annual total returns table would be lower.

                  The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not
            reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ
            from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements,
            such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class A and after-tax returns
            for other classes will vary.


</rr:PerformanceTableClosingTextBlock>
    <rr:ObjectiveHeading contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         Investment Goal

</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         High level of current income, while providing lower volatility of principal than a fund that invests in fixed-rate securities.

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         Fees and Expenses of the Fund

</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">                  These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $100,000 in Franklin Templeton funds. More information about these and other discounts is available from your financial professional and under &#x93;Your Account&#x94; on page 149 in the Fund's Prospectus and under &#x93;Buying and Selling Shares&#x94; on page 89 of the Fund&#x92;s
            Statement of Additional Information. In addition, more information about sales charge discounts and waivers for purchases
            of shares through specific financial intermediaries is set forth in Appendix A &#x96; "Intermediary Sales Charge Discounts
            and Waivers" to the Fund&#x92;s prospectus.

                  Please note that the tables and examples below do not reflect any transaction fees that may be charged by financial intermediaries,
            or commissions that a shareholder may be required to pay directly to its financial intermediary when buying or selling Class
            R6 or Advisor Class shares.


</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseBreakpointDiscounts contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $100,000 in Franklin Templeton funds.</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">100000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:ShareholderFeesCaption contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">Shareholder Fees (fees paid directly from your investment)

</rr:ShareholderFeesCaption>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0225</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0225</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222457_398"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222457_399"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0100</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:OperatingExpensesCaption contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         Annual Fund Operating Expenses
                  (expenses that you pay each year as a percentage of the value of your investment)

</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0050</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0050</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0050</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0050</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0050</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0010</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0065</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0022</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0022</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0022</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_416"
      unitRef="pure">0.0013</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0022</rr:OtherExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_418"
      unitRef="pure">0.0002</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_419"
      unitRef="pure">0.0002</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_420"
      unitRef="pure">0.0002</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_421"
      unitRef="pure">0.0002</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_422"
      unitRef="pure">0.0002</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_423"
      unitRef="pure">0.0099</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_424"
      unitRef="pure">0.0084</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_425"
      unitRef="pure">0.0139</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_426"
      unitRef="pure">0.0065</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_427"
      unitRef="pure">0.0074</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_428"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_429"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_430"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_431"
      unitRef="pure">-0.0004</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_432"
      unitRef="pure">-0.0001</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_433"
      unitRef="pure">0.0098</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_434"
      unitRef="pure">0.0083</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_435"
      unitRef="pure">0.0138</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_436"
      unitRef="pure">0.0061</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222468_437"
      unitRef="pure">0.0073</rr:NetExpensesOverAssets>
    <rr:ExpenseExampleHeading contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         Example

</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual
            funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem 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. The Example reflects adjustments made to the Fund's operating expenses due to the fee
            waivers and/or expense reimbursements by management for the 1 Year numbers only. Although your actual costs may be higher
            or lower, based on these assumptions your costs would be:


</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">323</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">532</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">759</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1410</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">308</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">486</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">680</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006850_C000140480_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1238</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">240</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">439</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">760</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1668</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">62</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">204</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">358</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006850_C000133492_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">807</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">75</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">236</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">411</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006850_C000064441_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">918</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleNoRedemptionByYearCaption contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">If you do not sell your shares:</rr:ExpenseExampleNoRedemptionByYearCaption>
    <rr:ExpenseExampleNoRedemptionYear01
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">140</rr:ExpenseExampleNoRedemptionYear01>
    <rr:ExpenseExampleNoRedemptionYear03
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">439</rr:ExpenseExampleNoRedemptionYear03>
    <rr:ExpenseExampleNoRedemptionYear05
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">760</rr:ExpenseExampleNoRedemptionYear05>
    <rr:ExpenseExampleNoRedemptionYear10
      contextRef="S000006850_C000018510_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1668</rr:ExpenseExampleNoRedemptionYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">Portfolio Turnover

</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         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 35.03% of the average value of its portfolio.


</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.3503</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         Principal Investment Strategies

</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">                                             Under normal market conditions, the Fund invests at least 80% of its net assets in &#x93;adjustable-rate U.S. government mortgage
               securities.&#x94; &#x93;Adjustable-rate U.S. government mortgage securities&#x94; include adjustable-rate mortgage securities (ARMS) and other
            mortgage-backed securities, including collateralized mortgage obligations (CMOs), with interest rates that adjust periodically
            to reflect prevailing market interest rates, which are issued or guaranteed by the U.S. government, its agencies or instrumentalities,
            including government-sponsored entities.

                  Mortgage-backed securities represent an interest in a pool of mortgage loans made by banks and other financial institutions
            to finance purchases of homes, commercial buildings and other real estate. As the underlying mortgage loans are paid off,
            investors receive periodic principal and interest payments as well as any unscheduled principal prepayments on the underlying
            mortgage loans. The mortgage-backed securities purchased by the Fund may include bonds and notes issued or guaranteed by U.S.
            government-sponsored entities, such as the Federal National Mortgage Association (Fannie Mae) and the Federal Home Loan Mortgage
            Corporation (Freddie Mac) and by the Government National Mortgage Association (Ginnie Mae). The Fund currently focuses on
            mortgage-backed securities issued or guaranteed by Fannie Mae and Freddie Mac.

                  Government agency or instrumentality issues have different levels of credit support. Ginnie Mae pass-through mortgage certificates
            are backed by the full faith and credit of the U.S. government. U.S. government-sponsored entities, such as Fannie Mae and Freddie Mac, may be chartered by Acts of Congress, but their securities
               are neither issued nor guaranteed by the U.S. government. Although the U.S. government has provided financial support to Fannie
               Mae and Freddie Mac, no assurance can be given that the U.S. government will continue to do so. Accordingly, securities issued by Fannie Mae and Freddie Mac may involve a greater risk of non-payment of principal and interest.
            Investors should remember that guarantees of timely repayment of principal and interest do not apply to the market prices
            and yields of the securities or to the net asset value or performance of the Fund, which will vary with changes in interest
            rates and other market conditions.

                  Periodic interest rate adjustments may help keep the prices of ARMS relatively stable when compared with the prices of fixed-rate
            securities, which generally fall when interest rates rise. As a result, the Fund may participate in increases in interest
            rates resulting in higher current yields, but with less fluctuation in net asset value than a fund invested in comparable
            fixed-rate securities. Adjustable-rate securities, however, frequently limit the maximum amount by which the interest rate
            may change up or down. The Fund, therefore, may not benefit from increases in interest rates if prevailing interest rates
            exceed a security's maximum allowable periodic or lifetime limits. During periods of falling interest rates, the interest
            rates on these securities may reset downward, resulting in a lower yield for the Fund.

                  The Fund may invest up to 20% of its net assets in other securities, including fixed-rate mortgage-backed securities and mortgage-backed
            securities, including non-agency CMOs, issued by a private entity. The Fund may also invest in direct obligations of the U.S.
            government or of its agencies, instrumentalities or sponsored enterprises, such as Treasury bills, bonds or notes, and in
            repurchase agreements collateralized by U.S. government or government agency securities.


</rr:StrategyNarrativeTextBlock>
    <rr:StrategyPortfolioConcentration contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">Under normal market conditions, the Fund invests at least 80% of its net assets in &#x93;adjustable-rate U.S. government mortgage
               securities.&#x94;</rr:StrategyPortfolioConcentration>
    <rr:RiskHeading contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         Principal Risks

</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">                  You could lose money by investing in the Fund. Mutual fund 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.

                  Interest Rate&#160;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.

         Prepayment&#160;Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's maturity and the Fund
            must reinvest the proceeds it receives, during periods of declining interest rates, in securities that pay a lower rate of
            interest. Also, if a security has been purchased at a premium, the value of the premium would be lost in the event of prepayment.
            Prepayments generally increase when interest rates fall.

         Mortgage Securities&#160;Mortgage securities differ from conventional debt securities because principal is paid back periodically over the life of
            the security rather than at maturity. The Fund may receive unscheduled payments of principal due to voluntary prepayments,
            refinancings or foreclosures on the underlying mortgage loans. Because of prepayments, mortgage securities may be less effective
            than some other types of debt securities as a means of "locking in" long-term interest rates and may have less potential for
            capital appreciation during periods of falling interest rates. A reduction in the anticipated rate of principal prepayments,
            especially during periods of rising interest rates, may increase or extend the effective maturity of mortgage securities,
            making them more sensitive to interest rate changes, subject to greater price volatility, and more susceptible than some other
            debt securities to a decline in market value when interest rates rise.

         Adjustable Rate Securities&#160;Because changes in interest rates on adjustable rate securities may lag behind changes in market rates, the value of such
            securities may decline during periods of rising interest rates until their interest rates reset to market rates. During periods
            of declining interest rates, because the interest rates on adjustable rate securities generally reset downward, their market
            value is unlikely to rise to the same extent as the value of comparable fixed rate securities.

         Extension&#160;Some debt securities, particularly mortgage-backed securities, are subject to the risk that the debt security&#x92;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.

         Market&#160;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.

         The current global outbreak of the novel strain of coronavirus, COVID-19, has resulted in market closures and dislocations,
            extreme volatility, liquidity constraints and increased trading costs. Efforts to contain the spread of COVID-19 have resulted
            in global travel restrictions and disruptions of healthcare systems, business operations and supply chains, layoffs, reduced
            consumer demand, defaults and credit ratings downgrades, and other significant economic impacts. The effects of COVID-19 have
            impacted global economic activity across many industries and may heighten other pre-existing political, social and economic
            risks, locally or globally. The full impact of the COVID-19 pandemic is unpredictable and may adversely affect the Fund&#x92;s
            performance.

         Income&#160;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.

         Credit&#160;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 credit rating may affect a security's value. While securities issued
            by Ginnie Mae are backed by the full faith and credit of the U.S. government, not all securities of the various U.S. government
            agencies are, including those of Fannie Mae and Freddie Mac. Accordingly, securities issued by Fannie Mae and Freddie Mac
            may involve a risk of non-payment of principal and interest.

         Management&#160;The Fund is subject to management risk because it is an actively managed investment portfolio. 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.


</rr:RiskNarrativeTextBlock>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         Performance

</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">                  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 for Class A shares. 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. 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 franklintempleton.com or by calling (800) DIAL BEN/342-5236.

                  Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">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 for Class A shares. 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.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the
               future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">franklintempleton.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityPhone contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">(800) DIAL BEN/342-5236</rr:PerformanceAvailabilityPhone>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartHeading contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         Class A Annual Total Returns

</rr:BarChartHeading>
    <rr:HighestQuarterlyReturnLabel contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0242</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="S000006850_C000018509_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0151</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">         Average Annual Total Returns(figures reflect sales charges)

                  For the periods ended December 31, 2020

</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnLabel contextRef="S000006850_C000018509_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006850_C000018509_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0108</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006850_C000018509_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0033</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006850_C000018509_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0047</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006850_C000018509_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006850_C000018509_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0184</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006850_C000018509_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0057</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006850_C000018509_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0026</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006850_C000018509_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006850_C000018509_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0064</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006850_C000018509_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0014</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006850_C000018509_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0005</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006850_C000140480_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0082</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006850_C000140480_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0048</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006850_C000140480_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0057</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006850_C000018510_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0013</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006850_C000018510_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0040</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006850_C000018510_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0029</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006850_C000133492_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0163</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006850_C000133492_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0119</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnSinceInception
      contextRef="S000006850_C000133492_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222624_513"
      unitRef="pure">0.0097</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006850_C000064441_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0152</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006850_C000064441_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0105</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006850_C000064441_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0094</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006850_IndexBM7187_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0254</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006850_IndexBM7187_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0173</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006850_IndexBM7187_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0111</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock contextRef="S000006850_FranklinInvestorsSecuritiesTrustFIST235Member">                  Historical performance for Class A1 shares prior to their inception is based on the performance of Class A shares.
                  The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not
            reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ
            from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements,
            such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class A and after-tax returns
            for other classes will vary.


</rr:PerformanceTableClosingTextBlock>
    <rr:ObjectiveHeading contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         Investment Goal

</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         High level of current income. A secondary goal is preservation of capital.

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         Fees and Expenses of the Fund

</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">                  These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $100,000 in Franklin Templeton funds. More information about these and other discounts is available from your financial professional and under &#x93;Your Account&#x94; on page 149 in the Fund's Prospectus and under &#x93;Buying and Selling Shares&#x94; on page 89 of the Fund&#x92;s
            Statement of Additional Information. In addition, more information about sales charge discounts and waivers for purchases
            of shares through specific financial intermediaries is set forth in Appendix A &#x96; "Intermediary Sales Charge Discounts
            and Waivers" to the Fund&#x92;s prospectus.

                  Please note that the tables and examples below do not reflect any transaction fees that may be charged by financial intermediaries,
            or commissions that a shareholder may be required to pay directly to its financial intermediary when buying or selling Class
            R6 or Advisor Class shares.


</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseBreakpointDiscounts contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $100,000 in Franklin Templeton funds.</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">100000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:ShareholderFeesCaption contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">Shareholder Fees (fees paid directly from your investment)

</rr:ShareholderFeesCaption>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0225</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222745_530"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0100</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:OperatingExpensesCaption contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         Annual Fund Operating Expenses
                  (expenses that you pay each year as a percentage of the value of your investment)

</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0056</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0056</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0056</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0056</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0065</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0015</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0015</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_544"
      unitRef="pure">0.0014</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0015</rr:OtherExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_546"
      unitRef="pure">0.0003</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_547"
      unitRef="pure">0.0003</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_548"
      unitRef="pure">0.0003</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_549"
      unitRef="pure">0.0003</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_550"
      unitRef="pure">0.0099</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_551"
      unitRef="pure">0.0139</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_552"
      unitRef="pure">0.0073</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_553"
      unitRef="pure">0.0074</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_554"
      unitRef="pure">-0.0003</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_555"
      unitRef="pure">-0.0003</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_556"
      unitRef="pure">-0.0011</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_557"
      unitRef="pure">-0.0003</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_558"
      unitRef="pure">0.0096</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_559"
      unitRef="pure">0.0136</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_560"
      unitRef="pure">0.0062</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222754_561"
      unitRef="pure">0.0071</rr:NetExpensesOverAssets>
    <rr:ExpenseExampleHeading contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         Example

</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual
            funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem 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. The Example reflects adjustments made to the Fund's operating expenses due to the fee
            waivers and/or expense reimbursements by management for the 1 Year numbers only. Although your actual costs may be higher
            or lower, based on these assumptions your costs would be:


</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">321</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">530</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">757</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1410</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">238</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">437</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">758</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1668</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">63</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">222</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">395</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006853_C000128879_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">897</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">73</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">234</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">409</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006853_C000018520_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">917</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleNoRedemptionByYearCaption contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">If you do not sell your shares:</rr:ExpenseExampleNoRedemptionByYearCaption>
    <rr:ExpenseExampleNoRedemptionYear01
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">138</rr:ExpenseExampleNoRedemptionYear01>
    <rr:ExpenseExampleNoRedemptionYear03
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">437</rr:ExpenseExampleNoRedemptionYear03>
    <rr:ExpenseExampleNoRedemptionYear05
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">758</rr:ExpenseExampleNoRedemptionYear05>
    <rr:ExpenseExampleNoRedemptionYear10
      contextRef="S000006853_C000018519_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1668</rr:ExpenseExampleNoRedemptionYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">Portfolio Turnover

</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         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 32.39% of the average value of its portfolio.


</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.3239</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         Principal Investment Strategies

</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">                                                                                 The Fund normally invests at least 80% of its net assets in income-producing floating interest rate corporate loans and corporate
            debt securities made to or issued by U.S. companies, non-U.S. entities and U.S. subsidiaries of non-U.S. entities. Floating
            interest rates vary with and are periodically adjusted to a generally recognized base interest rate such as the London Interbank
            Offered Rate (LIBOR) or the Prime Rate. The Fund may invest in companies whose financial condition is troubled or uncertain
            and that may be involved in bankruptcy proceedings, reorganizations or financial restructurings.

                  Floating interest rate corporate loans and debt securities, also called bank loans or senior floating rate interests (collectively,
            floating rate investments), generally have credit ratings below investment grade and may be subject to restrictions on resale.
            Under normal market conditions, the Fund invests at least 75% of its net assets in floating rate investments that are rated
            B- or higher at the time of purchase by a nationally recognized statistical rating organization (NRSRO) or, if unrated, are
            determined to be of comparable quality by the Fund&#x92;s investment manager. Under normal market conditions, the Fund may
            invest up to 25% of its net assets in floating rate investments that are rated below B- by an NRSRO or, if unrated, are determined
            to be of comparable quality by the investment manager.

                  The Fund's floating rate investments typically hold the most senior position in the capitalization structure of a company
            and are generally secured by specific collateral. Such senior position means that, in case the company becomes insolvent,
            the lenders or security holders in a senior position like the Fund's position will typically be paid before other unsecured
            or subordinated creditors of the company from the assets of the company.

                  The Fund typically invests in a corporate loan or corporate debt security if the investment manager judges that the borrower
            can meet the scheduled payments of interest and principal on the obligation. The investment manager performs its own independent
            credit analysis of each borrower/issuer and of the collateral structure securing the Fund&#x92;s investment. The investment
            manager also considers the nature of the industry in which the borrower operates, the nature of the borrower's assets, and
            the general quality and creditworthiness of the borrower and of any shareholder or other entity providing credit support to
            the borrower.

                  The Fund may invest in &#x93;covenant lite&#x94; loans and debt securities. Certain financial institutions may define &#x93;covenant
            lite&#x94; loans differently. Covenant lite loans or securities, which have varied terms and conditions, may have tranches
            that contain fewer or no maintenance financial covenants, which require borrowers/issuers to meet financial requirements specified
            under the loan credit agreement that are tested regularly for compliance. The most common examples of maintenance financial
            covenants include maximum leverage and minimum interest coverage ratios. Because a covenant lite loan or debt security does
            not require the borrower to maintain these financial tests regularly, investors typically have less ability to declare a default,
            and therefore receive collateral in a timely manner, or to force restructurings and other capital changes on struggling borrowers
            compared to an otherwise similar loan that does contain maintenance financial covenants. The Fund may experience relatively
            greater difficulty or delays in enforcing its rights on its holdings of certain covenant lite loans and debt securities than
            its holdings of loans or securities with maintenance financial covenants. However, depending on the circumstances, there are
            often alternative sources of recourse portfolio managers can seek in order to protect their investments. Further, the Fund
            typically invests in a corporate loan or corporate debt security, including those that are covenant lite, if the investment
            manager judges that the borrower can meet the scheduled payments of interest and principal on the obligation and meets other
            creditworthiness criteria.

                  The Fund may invest in structured fixed income securities, including collateralized loan obligations (CLOs).
                  The Fund currently limits its investments in debt obligations of non-U.S. entities to no more than 25% of its total assets.
            The Fund currently invests predominantly in debt obligations that are U.S. dollar-denominated or otherwise provide for payment
            in U.S. dollars.

                  The Fund currently does not intend to invest more than 25% of its net assets in the obligations of borrowers in any single
            industry, except that, under normal market conditions, the Fund invests more than 25% of its net assets in debt obligations
            of companies operating in the industry group consisting of financial institutions and their holding companies, including commercial
            banks, thrift institutions, insurance companies and finance companies. These firms, or "agent banks," may serve as administrators
            of corporate loans issued by other companies. For purposes of this restriction, the Fund currently considers such companies
            to include the borrower, the agent bank and any intermediate participant. The Fund may invest up to 100% of its net assets
            in loans where firms in such industry group are borrowers, agent banks or intermediate participants.

                  In addition to the Fund&#x92;s main investments, the Fund may invest up to 20% of its net assets in certain other types of
            debt obligations and equity or debt securities, including, but not limited to, other secured, second lien, subordinated or
            unsecured corporate loans and corporate debt securities, fixed rate obligations of U.S. companies, non-U.S. entities and U.S.
            subsidiaries of non-U.S. entities and equity securities (including convertible securities, warrants and rights) to the extent
            that they are acquired in connection with or incidental to the Fund's other investment activities.


</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         Principal Risks

</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">                  You could lose money by investing in the Fund. Mutual fund 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.

                  Credit&#160;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.

         Floating Rate Corporate Investments&#160;Floating rate corporate loans and corporate debt securities generally have credit ratings below investment grade and may be
            subject to resale restrictions. They are often issued in connection with highly leveraged transactions, and may be subject
            to greater credit risks than other investments including the possibility of default or bankruptcy. In addition, a secondary
            market in corporate loans may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement
            periods, which may impair the ability to accurately value existing and prospective investments and to realize in a timely
            fashion the full value upon the sale of a corporate loan. A significant portion of floating rate investments may be &#x93;covenant
            lite&#x94; loans that may contain fewer or less restrictive constraints on the borrower or other borrower-friendly characteristics.


         Market&#160;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.

         The current global outbreak of the novel strain of coronavirus, COVID-19, has resulted in market closures and dislocations,
            extreme volatility, liquidity constraints and increased trading costs. Efforts to contain the spread of COVID-19 have resulted
            in global travel restrictions and disruptions of healthcare systems, business operations and supply chains, layoffs, reduced
            consumer demand, defaults and credit ratings downgrades, and other significant economic impacts. The effects of COVID-19 have
            impacted global economic activity across many industries and may heighten other pre-existing political, social and economic
            risks, locally or globally. The full impact of the COVID-19 pandemic is unpredictable and may adversely affect the Fund&#x92;s
            performance.

         Impairment of Collateral&#160;The value of collateral securing a loan or other corporate debt security may decline after the Fund invests and there is a
            risk that the value of the collateral may not be sufficient to cover the amount owed to the Fund, or the collateral securing
            a loan may be found invalid, may be used to pay other outstanding obligations of the borrower under applicable law or may
            be difficult to sell.


         Liquidity&#160;From time to time, the trading market for a particular security or type of security or other investments in which the Fund
            invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the Fund&#x92;s ability
            to sell such securities or other investments when necessary to meet the Fund&#x92;s liquidity needs, which may arise or increase
            in response to a specific economic event or because the investment manager wishes to purchase particular investments or believes
            that a higher level of liquidity would be advantageous. Reduced liquidity will also generally lower the value of such securities
            or other investments. Market prices for such securities or other investments may be relatively volatile.

         High-Yield Debt Securities&#160;Issuers of lower-rated or &#x93;high-yield&#x94; debt securities are not as strong financially as those issuing higher credit
            quality debt securities. High-yield debt securities are generally considered predominantly speculative by the applicable rating
            agencies as their issuers are more likely to encounter financial difficulties because they may be more highly leveraged, or
            because of other considerations. In addition, high yield debt securities generally are more vulnerable to changes in the relevant
            economy, such as a recession or a sustained period of rising interest rates, that could affect their ability to make interest
            and principal payments when due. The prices of high-yield debt securities generally fluctuate more than those of higher credit
            quality. High-yield debt securities are generally more illiquid (harder to sell) and harder to value.

         Prepayment&#160;Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's maturity and the Fund
            must reinvest the proceeds it receives, during periods of declining interest rates, in securities that pay a lower rate of
            interest. Also, if a security has been purchased at a premium, the value of the premium would be lost in the event of prepayment.
            Prepayments generally increase when interest rates fall.

         Interest Rate&#160;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.

         Variable Rate Securities&#160;Because changes in interest rates on variable rate securities (including floating rate securities) may lag behind changes
            in market rates, the value of such securities may decline during periods of rising interest rates until their interest rates
            reset to market rates. During periods of declining interest rates, because the interest rates on variable rate securities
            generally reset downward, their market value is unlikely to rise to the same extent as the value of comparable fixed rate
            securities.


         Income&#160;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.

         Concentration&#160;Because of the Fund&#x92;s focus on a given industry or group of industries, the losses the Fund may experience are greater
            upon any single economic, business, political, regulatory, or other occurrence affecting such industry or group of industries.
            As a result, there may be more fluctuation in the price of the Fund&#x92;s shares.

         Collateralized Loan Obligations (CLOs)&#160;The risks of an investment in a CLO depend largely on the type of collateral held by the special purpose entity (SPE) and
            the tranche of the CLO in which the Fund invests. CLOs may be deemed to be illiquid and subject to the Fund&#x92;s restrictions
            on investments in illiquid investments. In addition to the normal risks associated with debt securities and loans (e.g., interest
            rate risk, credit risk and default risk), CLOs 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
            CLO that are subordinate to other classes; and (iv) the complex structure of the security may not be fully understood at the
            time of investment.

         LIBOR Transition&#160;The Fund invests in financial instruments that may have floating or variable rate calculations for payment obligations or
            financing terms based on the London Interbank Offered Rate (LIBOR), which is the benchmark interest rate at which major global
            banks lend to one another in the international interbank market for short-term loans.  It is currently anticipated that LIBOR
            will be discontinued by the end of 2021 and will cease to be published after that time (although there are initiatives to
            delay the discontinuation beyond 2021 for certain LIBOR rates).  The impact of the discontinuation of LIBOR and the transition
            to an alternative rate on the Fund&#x92;s portfolio remains uncertain.  There can be no guarantee that financial instruments
            that transition to an alternative reference rate will retain the same value or liquidity as they would otherwise have had.

         Management&#160;The Fund is subject to management risk because it is an actively managed investment portfolio. 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.

         Foreign Securities (non-U.S.)&#160;Investing in foreign securities typically involves more risks than investing in U.S. securities, including risks related to
            currency exchange rates and policies, country or government specific issues, less favorable trading practices or regulation
            and greater price volatility. Certain of these risks also may apply to securities of U.S. companies with significant foreign
            operations.


</rr:RiskNarrativeTextBlock>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         Performance

</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">                  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 for Class A shares. 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. 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 franklintempleton.com or by calling (800) DIAL BEN/342-5236.

                  Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">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 for Class A shares. 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.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the
               future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">franklintempleton.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityPhone contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">(800) DIAL BEN/342-5236</rr:PerformanceAvailabilityPhone>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartHeading contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         Class A Annual Total Returns

</rr:BarChartHeading>
    <rr:HighestQuarterlyReturnLabel contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member">2016-09-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0417</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="S000006853_C000018517_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.1176</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         Average Annual Total Returns(figures reflect sales charges)

                  For the periods ended December 31, 2020

</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnLabel contextRef="S000006853_C000018517_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006853_C000018517_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0626</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006853_C000018517_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0209</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006853_C000018517_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0220</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006853_C000018517_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006853_C000018517_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0809</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006853_C000018517_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0017</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006853_C000018517_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0039</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006853_C000018517_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006853_C000018517_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0373</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006853_C000018517_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0078</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006853_C000018517_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0092</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006853_C000018519_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0528</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006853_C000018519_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0215</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006853_C000018519_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0204</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006853_C000128879_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0365</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006853_C000128879_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0295</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnSinceInception
      contextRef="S000006853_C000128879_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221222970_629"
      unitRef="pure">0.0212</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006853_C000018520_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0374</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006853_C000018520_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0281</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006853_C000018520_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0269</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006853_IndexBM0871_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0278</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006853_IndexBM0871_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0519</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006853_IndexBM0871_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0447</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock contextRef="S000006853_FranklinInvestorsSecuritiesTrustFIST235Member">         The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not
            reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ
            from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements,
            such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class A and after-tax returns
            for other classes will vary.


</rr:PerformanceTableClosingTextBlock>
    <rr:ObjectiveHeading contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         Investment Goal

</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         A high level of current income as is consistent with prudent investing, while seeking preservation of capital.

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         Fees and Expenses of the Fund

</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">                  These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $100,000 in Franklin Templeton funds. More information about these and other discounts is available from your financial professional and under &#x93;Your Account&#x94; on page 149 in the Fund's Prospectus and under &#x93;Buying and Selling Shares&#x94; on page 89 of the Fund&#x92;s
            Statement of Additional Information. In addition, more information about sales charge discounts and waivers for purchases
            of shares through specific financial intermediaries is set forth in Appendix A &#x96; "Intermediary Sales Charge Discounts
            and Waivers" to the Fund&#x92;s prospectus.

                  Please note that the tables and examples below do not reflect any transaction fees that may be charged by financial intermediaries,
            or commissions that a shareholder may be required to pay directly to its financial intermediary when buying or selling Class
            R6 or Advisor Class shares.


</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseBreakpointDiscounts contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $100,000 in Franklin Templeton funds.</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">100000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:ShareholderFeesCaption contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">Shareholder Fees (fees paid directly from your investment)

</rr:ShareholderFeesCaption>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0225</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223110_647"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0100</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:OperatingExpensesCaption contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         Annual Fund Operating Expenses
                  (expenses that you pay each year as a percentage of the value of your investment)

</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0049</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0049</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0049</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0049</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0049</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_657"
      unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_658"
      unitRef="pure">0.0065</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_659"
      unitRef="pure">0.0050</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_660"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_661"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0020</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0020</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0020</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0009</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0020</rr:OtherExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_667"
      unitRef="pure">0.0002</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_668"
      unitRef="pure">0.0002</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_669"
      unitRef="pure">0.0002</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_670"
      unitRef="pure">0.0002</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_671"
      unitRef="pure">0.0002</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_672"
      unitRef="pure">0.0096</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_673"
      unitRef="pure">0.0136</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_674"
      unitRef="pure">0.0121</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_675"
      unitRef="pure">0.0060</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_676"
      unitRef="pure">0.0071</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_677"
      unitRef="pure">-0.0025</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_678"
      unitRef="pure">-0.0025</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_679"
      unitRef="pure">-0.0025</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_680"
      unitRef="pure">-0.0028</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_681"
      unitRef="pure">-0.0025</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_682"
      unitRef="pure">0.0071</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_683"
      unitRef="pure">0.0111</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_684"
      unitRef="pure">0.0096</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_685"
      unitRef="pure">0.0032</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223119_686"
      unitRef="pure">0.0046</rr:NetExpensesOverAssets>
    <rr:ExpenseExampleHeading contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         Example

</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual
            funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem 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. The Example reflects adjustments made to the Fund's operating expenses due to the fee
            waivers and/or expense reimbursements by management for the 1 Year numbers only. Although your actual costs may be higher
            or lower, based on these assumptions your costs would be:


</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">296</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">500</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">720</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1355</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">213</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">406</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">721</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1614</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">98</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">359</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">641</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006855_C000215060_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1444</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">33</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">164</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">307</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006855_C000128881_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">724</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">47</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">202</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">370</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006855_C000064444_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">859</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleNoRedemptionByYearCaption contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">If you do not sell your shares:</rr:ExpenseExampleNoRedemptionByYearCaption>
    <rr:ExpenseExampleNoRedemptionYear01
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">113</rr:ExpenseExampleNoRedemptionYear01>
    <rr:ExpenseExampleNoRedemptionYear03
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">406</rr:ExpenseExampleNoRedemptionYear03>
    <rr:ExpenseExampleNoRedemptionYear05
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">721</rr:ExpenseExampleNoRedemptionYear05>
    <rr:ExpenseExampleNoRedemptionYear10
      contextRef="S000006855_C000120960_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1614</rr:ExpenseExampleNoRedemptionYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">Portfolio Turnover

</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         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 93.23% of the average value of its portfolio.


</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.9323</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         Principal Investment Strategies

</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">                                                                                                   Under normal market conditions, the Fund invests primarily in debt securities, which may be represented by derivative investments
               that provide exposure to debt securities such as futures, options and swap agreements. The debt securities in which the Fund
               may invest include government and corporate debt securities, mortgage- and asset-backed securities, floating interest rate
               corporate loans and debt securities and municipal securities.
                  The Fund targets an estimated average portfolio duration of three (3) years or less. Duration is a measure of the expected
            price volatility of a debt instrument as a result of changes in market rates of interest, based on the weighted average timing
            of the instrument&#x92;s expected principal and interest payments and other factors.

                  Under normal market conditions, the Fund invests primarily in investment grade debt securities and in unrated securities that
            the investment manager deems are of comparable quality. Derivatives whose reference securities are investment grade are considered
            by the Fund to be investment grade. 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 also may invest up to 20% of its total assets in non-investment grade securities, including up to 5% in securities
            rated lower than B- by S&amp;P&#xae; Global Ratings (S&amp;P) or Moody's Investors Services (Moody's), which may include defaulted securities. (In calculating the
            above non-investment grade debt limitations, the Fund combines its non-investment grade debt securities with the net long
            and short exposure to non-investment grade debt securities from derivative instruments.) Excluding derivatives, the Fund invests
            no more than 33% of its total assets in non-investment grade debt securities, including no more than 5% in securities rated
            lower than B- by S&amp;P or Moody's, which may include defaulted securities. For purposes of the credit limitations above, non-investment
            grade debt securities include unrated securities that the investment manager deems are of comparable quality. The Fund's investments
            in marketplace loans are not subject to the 5% limitations described above.

                  The Fund may invest up to 25% of its total assets in foreign securities, including up to 20% of its total assets in non-U.S.
            dollar denominated securities and up to 10% of its total assets in emerging market securities.

                  The Fund may invest a portion of its assets in marketplace loans to consumers and small and mid-sized enterprises or companies
            (SMEs), which may include loans for individual leases, that may be originated through online lending platforms.

                  The Fund may invest in many different securities issued or guaranteed by the U.S. government or by non-U.S. governments, or
            their respective agencies or instrumentalities, including mortgage-backed securities and inflation-indexed securities issued
            by the U.S. Treasury. Mortgage-backed securities represent an interest in a pool of mortgage loans made by banks and other
            financial institutions to finance purchases of homes, commercial buildings and other real estate. The individual mortgage
            loans are packaged or "pooled" together for sale to investors. As the underlying mortgage loans are paid off, investors receive
            principal and interest payments. These securities may be fixed-rate or adjustable-rate mortgage-backed securities (ARMS).
            The Fund may purchase or sell mortgage-backed securities on a delayed delivery or forward commitment basis through the "to-be-announced"
            (TBA) market. With TBA transactions, the particular securities to be delivered must meet specified terms and standards. The
            Fund may also invest a small portion of its assets directly in mortgage loans.

                  To pursue its investment goal, the Fund regularly enters into various derivative transactions, including currency forwards,
            currency, interest rate/bond futures contracts and options on interest rate futures contracts, options on exchange-traded
            funds, swap agreements, including interest rate, fixed income total return, currency and credit default swaps, options on
            interest rate and credit default swap agreements. The use of these derivative transactions may allow the Fund to obtain net
            long or short exposures to select currencies, interest rates, countries, duration 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 in mortgage dollar rolls. In a mortgage dollar roll, the Fund sells mortgage-backed securities for delivery
            in the current month and simultaneously contracts to repurchase substantially similar (same type, coupon, and maturity) securities
            on a specified future date. During the period between the sale and repurchase, the Fund forgoes principal and interest paid
            on the mortgage-backed securities. The Fund earns money on a mortgage dollar roll from any difference between the sale price
            and the future purchase price, as well as the interest earned on the cash proceeds of the initial sale.

                  The Fund may invest a significant portion of its assets in structured fixed income securities, such as collateralized debt
            obligations (&#x93;CDOs&#x94;), which are generally a type of asset-backed securities. The Fund's investments in CDOs may
            include investments in collateralized loan obiligations (CLOs), which are a type of CDO.

                  In choosing investments, the Fund&#x92;s investment manager selects securities in various market sectors based on the investment
            manager&#x92;s assessment of changing economic, market, industry and issuer conditions. The investment manager uses a &#x93;top-down&#x94;
            analysis of macroeconomic trends, combined with a &#x93;bottom-up&#x94; fundamental analysis of market sectors, industries
            and issuers, to try to take advantage of varying sector reactions to economic events.


</rr:StrategyNarrativeTextBlock>
    <rr:StrategyPortfolioConcentration contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">Under normal market conditions, the Fund invests primarily in debt securities, which may be represented by derivative investments
               that provide exposure to debt securities such as futures, options and swap agreements. The debt securities in which the Fund
               may invest include government and corporate debt securities, mortgage- and asset-backed securities, floating interest rate
               corporate loans and debt securities and municipal securities.</rr:StrategyPortfolioConcentration>
    <rr:RiskHeading contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         Principal Risks

</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">                  You could lose money by investing in the Fund. Mutual fund 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.

                  Credit&#160;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.

         Interest Rate&#160;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.


         Mortgage Securities and Asset-Backed Securities&#160;Mortgage securities differ from conventional debt securities because principal is paid back periodically over the life of
            the security rather than at maturity. The Fund may receive unscheduled payments of principal due to voluntary prepayments,
            refinancings or foreclosures on the underlying mortgage loans. Because of prepayments, mortgage securities may be less effective
            than some other types of debt securities as a means of "locking in" long-term interest rates and may have less potential for
            capital appreciation during periods of falling interest rates. A reduction in the anticipated rate of principal prepayments,
            especially during periods of rising interest rates, may increase or extend the effective maturity of mortgage securities,
            making them more sensitive to interest rate changes, subject to greater price volatility, and more susceptible than some other
            debt securities to a decline in market value when interest rates rise.

         Issuers of asset-backed securities may have limited ability to enforce the security interest in the underlying assets, and
            credit enhancements provided to support the securities, if any, may be inadequate to protect investors in the event of default.
            Like mortgage securities, asset-backed securities are subject to prepayment and extension risks.

         High-Yield Debt Securities&#160;Issuers of lower-rated or &#x93;high-yield&#x94; debt securities (also known as &#x93;junk bonds&#x94;) are not as strong
            financially as those issuing higher credit quality debt securities. High-yield debt securities are generally considered predominantly
            speculative by the applicable rating agencies as their issuers are more likely to encounter financial difficulties because
            they may be more highly leveraged, or because of other considerations. In addition, high yield debt securities generally are
            more vulnerable to changes in the relevant economy, such as a recession or a sustained period of rising interest rates, that
            could affect their ability to make interest and principal payments when due. The prices of high-yield debt securities generally
            fluctuate more than those of higher credit quality. High-yield debt securities are generally more illiquid (harder to sell)
            and harder to value.

         Floating Rate Corporate Investments&#160;Floating rate corporate loans and corporate debt securities generally have credit ratings below investment grade and may be
            subject to resale restrictions. They are often issued in connection with highly leveraged transactions, and may be subject
            to greater credit risks than other investments including the possibility of default or bankruptcy. In addition, a secondary
            market in corporate loans may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement
            periods, which may impair the ability to accurately value existing and prospective investments and to realize in a timely
            fashion the full value upon the sale of a corporate loan. A significant portion of floating rate investments may be &#x93;covenant
            lite&#x94; loans that may contain fewer or less restrictive constraints on the borrower or other borrower-friendly characteristics.

         Derivative Instruments&#160;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 the underlying instrument, in addition
            to other risks. Derivatives involve costs and can create economic leverage in the Fund&#x92;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&#x92;s
            initial investment. Certain derivatives have the potential for unlimited loss, regardless of the size of the 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, index or other risk being hedged. Derivatives also may present the risk that the other
            party to the transaction will fail to perform.

         Collateralized Debt Obligations (CDOs)&#160;The risks of an investment in a CDO, a type of asset backed security and which includes collateralized loan obligations (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&#x92;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.

         Income&#160;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.

         Marketplace Loans&#160;Marketplace loans are subject to the risks associated with debt investments generally, including but not limited to, interest
            rate, credit, liquidity, high yield debt, market and income risks.  Marketplace loans generally are not rated by rating agencies,
            are often unsecured, and are highly risky and speculative investments.  Lenders and investors, such as the Fund, assume all
            of the credit risk on the loans they fund or purchase and there are no assurances that payments due on underlying loans will
            be made. In addition, investments in marketplace loans may be adversely affected if the platform operator or a third-party
            service provider becomes unable or unwilling to fulfill its obligations in servicing the loans. Moreover, the Fund may have
            limited information about the underlying marketplace loans and information provided to the platform regarding the loans and
            the borrowers&#x92; credit information may be incomplete, inaccurate or outdated. It also may be difficult for the Fund to
            sell an investment in a marketplace loan before maturity at the price at which the Fund believes the loan should be valued
            because these loans typically are considered by the Fund to be illiquid securities.

         Foreign Securities (non-U.S.)&#160;Investing in foreign securities typically involves more risks than investing in U.S. securities, including risks related to
            currency exchange rates and policies, country or government specific issues, less favorable trading practices or regulation
            and greater price volatility. Certain of these risks also may apply to securities of U.S. companies with significant foreign
            operations.

         Currency Management Strategies&#160;Currency management strategies may substantially change the Fund&#x92;s exposure to currency exchange rates and could result
            in losses to the Fund if currencies do not perform as the investment manager expects. In addition, currency management strategies,
            to the extent that they reduce the Fund&#x92;s exposure to currency risks, also reduce the Fund&#x92;s ability to benefit
            from favorable changes in currency exchange rates. Using currency management strategies for purposes other than hedging further
            increases the Fund&#x92;s exposure to foreign investment losses. Currency markets generally are not as regulated as securities
            markets. In addition, currency rates may fluctuate significantly over short periods of time, and can reduce returns.

         Sovereign Debt Securities&#160;Sovereign debt securities are subject to various risks in addition to those relating to debt securities and foreign investments
            generally, including, but not limited to, the risk that a governmental entity may be unwilling or unable to pay interest and
            repay principal on its sovereign debt, or otherwise meet its obligations when due because of cash flow problems, insufficient
            foreign reserves, the relative size of the debt service burden to the economy as a whole, the government&#x92;s policy towards
            principal international lenders such as the International Monetary Fund, or the political considerations to which the government
            may be subject. If a sovereign debtor defaults (or threatens to default) on its sovereign debt obligations, the indebtedness
            may be restructured. Some sovereign debtors have in the past been able to restructure their debt payments without the approval
            of some or all debt holders or to declare moratoria on payments. In the event of a default on sovereign debt, the Fund may
            also have limited legal recourse against the defaulting government entity.

         Emerging Market Countries&#160;The Fund&#x92;s investments  in emerging market countries are subject to all of the risks of foreign investing generally,
            and have additional heightened risks due to a lack of established legal, political, business and social frameworks to support
            securities and currency markets, including: delays in settling portfolio transactions; currency and capital controls; greater
            sensitivity to interest rate changes; pervasiveness of corruption and crime; currency exchange rate volatility; and inflation,
            deflation or currency devaluation.

         Extension&#160;Some debt securities, particularly mortgage-backed securities, are subject to the risk that the debt security&#x92;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.

         Prepayment&#160;Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's maturity and the Fund
            must reinvest the proceeds it receives, during periods of declining interest rates, in securities that pay a lower rate of
            interest. Also, if a security has been purchased at a premium, the value of the premium would be lost in the event of prepayment.
            Prepayments generally increase when interest rates fall.

         Mortgage Dollar Rolls&#160;In a mortgage dollar roll, the Fund takes the risk that: the market price of the mortgage securities will drop below their
            future repurchase price; the securities that it repurchases at a later date will have less favorable market characteristics;
            the other party to the agreement will not be able to perform; the roll adds leverage to the Fund's portfolio; and, it increases
            the Fund's sensitivity to interest rate changes. In addition, investment in mortgage dollar rolls may increase the portfolio
            turnover rate for the Fund.

         Liquidity&#160;From time to time, the trading market for a particular security or type of security or other investments in which the Fund
            invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the Fund&#x92;s ability
            to sell such securities or other investments when necessary to meet the Fund&#x92;s liquidity needs, which may arise or increase
            in response to a specific economic event or because the investment manager wishes to purchase particular investments or believes
            that a higher level of liquidity would be advantageous. Reduced liquidity will also generally lower the value of such securities
            or other investments. Market prices for such securities or other investments may be relatively volatile.

         Variable Rate Securities&#160;Because changes in interest rates on variable rate securities (including floating rate securities) may lag behind changes
            in market rates, the value of such securities may decline during periods of rising interest rates until their interest rates
            reset to market rates. During periods of declining interest rates, because the interest rates on variable rate securities
            generally reset downward, their market value is unlikely to rise to the same extent as the value of comparable fixed rate
            securities.

         Market&#160;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.

         The current global outbreak of the novel strain of coronavirus, COVID-19, has resulted in market closures and dislocations,
            extreme volatility, liquidity constraints and increased trading costs. Efforts to contain the spread of COVID-19 have resulted
            in global travel restrictions and disruptions of healthcare systems, business operations and supply chains, layoffs, reduced
            consumer demand, defaults and credit ratings downgrades, and other significant economic impacts. The effects of COVID-19 have
            impacted global economic activity across many industries and may heighten other pre-existing political, social and economic
            risks, locally or globally. The full impact of the COVID-19 pandemic is unpredictable and may adversely affect the Fund&#x92;s
            performance.

         LIBOR Transition&#160;The Fund invests in financial instruments that may have floating or variable rate calculations for payment obligations or
            financing terms based on the London Interbank Offered Rate (LIBOR), which is the benchmark interest rate at which major global
            banks lend to one another in the international interbank market for short-term loans.  It is currently anticipated that LIBOR
            will be discontinued by the end of 2021 and will cease to be published after that time (although there are initiatives to
            delay the discontinuation beyond 2021 for certain LIBOR rates).  The impact of the discontinuation of LIBOR and the transition
            to an alternative rate on the Fund&#x92;s portfolio remains uncertain.  There can be no guarantee that financial instruments
            that transition to an alternative reference rate will retain the same value or liquidity as they would otherwise have had.

         Management&#160;The Fund is subject to management risk because it is an actively managed investment portfolio. 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.


</rr:RiskNarrativeTextBlock>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         Performance

</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">                  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 for Class A shares. 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. 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 franklintempleton.com or by calling (800) DIAL BEN/342-5236.

                  Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">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 for Class A shares. 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.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the
               future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">franklintempleton.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityPhone contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">(800) DIAL BEN/342-5236</rr:PerformanceAvailabilityPhone>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartHeading contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         Class A Annual Total Returns

</rr:BarChartHeading>
    <rr:HighestQuarterlyReturnLabel contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0609</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="S000006855_C000018523_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0645</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">         Average Annual Total Returns(figures reflect sales charges)

                  For the periods ended December 31, 2020

</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnLabel contextRef="S000006855_C000018523_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006855_C000018523_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0073</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006855_C000018523_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0193</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006855_C000018523_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0159</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006855_C000018523_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006855_C000018523_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0049</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006855_C000018523_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0084</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006855_C000018523_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0056</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006855_C000018523_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006855_C000018523_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0041</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006855_C000018523_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0100</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006855_C000018523_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0077</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006855_C000120960_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0168</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006855_C000120960_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0198</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006855_C000120960_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0142</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006855_C000215060_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0281</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006855_C000215060_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0214</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006855_C000215060_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0155</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006855_C000128881_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0345</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006855_C000128881_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0279</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnSinceInception
      contextRef="S000006855_C000128881_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223395_762"
      unitRef="pure">0.0206</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006855_C000064444_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0335</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006855_C000064444_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0265</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006855_C000064444_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0208</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006855_IndexBM2754_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0333</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006855_IndexBM2754_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0221</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006855_IndexBM2754_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0159</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock contextRef="S000006855_FranklinInvestorsSecuritiesTrustFIST235Member">                  Historical performance for Class C shares prior to their inception is based on the performance of Class A shares. Class C
            performance has been adjusted to reflect differences in sales charges and 12b-1 expenses between classes.

                  The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not
            reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ
            from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements,
            such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class A and after-tax returns
            for other classes will vary.


</rr:PerformanceTableClosingTextBlock>
    <rr:ObjectiveHeading contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         Investment Goal

</rr:ObjectiveHeading>
    <rr:ObjectivePrimaryTextBlock contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         High current income, consistent with preservation of capital. As a secondary goal, capital appreciation over the long term.

</rr:ObjectivePrimaryTextBlock>
    <rr:ExpenseHeading contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         Fees and Expenses of the Fund

</rr:ExpenseHeading>
    <rr:ExpenseNarrativeTextBlock contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">                  These tables describe the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $100,000 in Franklin Templeton funds. More information about these and other discounts is available from your financial professional and under &#x93;Your Account&#x94; on page 149 in the Fund's Prospectus and under &#x93;Buying and Selling Shares&#x94; on page 89 of the Fund&#x92;s
            Statement of Additional Information. In addition, more information about sales charge discounts and waivers for purchases
            of shares through specific financial intermediaries is set forth in Appendix A &#x96; "Intermediary Sales Charge Discounts
            and Waivers" to the Fund&#x92;s prospectus.

                  Please note that the tables and examples below do not reflect any transaction fees that may be charged by financial intermediaries,
            or commissions that a shareholder may be required to pay directly to its financial intermediary when buying or selling Class
            R6 or Advisor Class shares.


</rr:ExpenseNarrativeTextBlock>
    <rr:ExpenseBreakpointDiscounts contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">You may qualify for sales charge discounts in Class A if you and your family invest, or agree to invest in the future, at
               least $100,000 in Franklin Templeton funds.</rr:ExpenseBreakpointDiscounts>
    <rr:ExpenseBreakpointMinimumInvestmentRequiredAmount
      contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">100000</rr:ExpenseBreakpointMinimumInvestmentRequiredAmount>
    <rr:ShareholderFeesCaption contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">Shareholder Fees (fees paid directly from your investment)

</rr:ShareholderFeesCaption>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0375</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumCumulativeSalesChargeOverOfferingPrice
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumCumulativeSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223541_780"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0100</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:MaximumDeferredSalesChargeOverOfferingPrice
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
    <rr:OperatingExpensesCaption contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         Annual Fund Operating Expenses
                  (expenses that you pay each year as a percentage of the value of your investment)

</rr:OperatingExpensesCaption>
    <rr:ManagementFeesOverAssets
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0047</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0047</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0047</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0047</rr:ManagementFeesOverAssets>
    <rr:ManagementFeesOverAssets
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0047</rr:ManagementFeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0065</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0050</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:DistributionAndService12b1FeesOverAssets
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0018</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0018</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0018</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0007</rr:OtherExpensesOverAssets>
    <rr:OtherExpensesOverAssets
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0018</rr:OtherExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_800"
      unitRef="pure">0.0005</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_801"
      unitRef="pure">0.0005</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_802"
      unitRef="pure">0.0005</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_803"
      unitRef="pure">0.0005</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:AcquiredFundFeesAndExpensesOverAssets
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_804"
      unitRef="pure">0.0005</rr:AcquiredFundFeesAndExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_805"
      unitRef="pure">0.0095</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_806"
      unitRef="pure">0.0135</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_807"
      unitRef="pure">0.0120</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_808"
      unitRef="pure">0.0059</rr:ExpensesOverAssets>
    <rr:ExpensesOverAssets
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_809"
      unitRef="pure">0.0070</rr:ExpensesOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_810"
      unitRef="pure">-0.0005</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_811"
      unitRef="pure">-0.0005</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_812"
      unitRef="pure">-0.0005</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_813"
      unitRef="pure">-0.0005</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:FeeWaiverOrReimbursementOverAssets
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_814"
      unitRef="pure">-0.0005</rr:FeeWaiverOrReimbursementOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_815"
      unitRef="pure">0.0090</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_816"
      unitRef="pure">0.0130</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_817"
      unitRef="pure">0.0115</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_818"
      unitRef="pure">0.0054</rr:NetExpensesOverAssets>
    <rr:NetExpensesOverAssets
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223550_819"
      unitRef="pure">0.0065</rr:NetExpensesOverAssets>
    <rr:ExpenseExampleHeading contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         Example

</rr:ExpenseExampleHeading>
    <rr:ExpenseExampleNarrativeTextBlock contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual
            funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem 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. The Example reflects adjustments made to the Fund's operating expenses due to the fee
            waivers and/or expense reimbursements by management for the 1 Year numbers only. Although your actual costs may be higher
            or lower, based on these assumptions your costs would be:


</rr:ExpenseExampleNarrativeTextBlock>
    <rr:ExpenseExampleYear01
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">463</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">662</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">876</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1495</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">232</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">423</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">735</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1622</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">117</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">376</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">655</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006857_C000018530_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1453</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">55</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">184</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">325</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006857_C000128883_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">734</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleYear01
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">66</rr:ExpenseExampleYear01>
    <rr:ExpenseExampleYear03
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">219</rr:ExpenseExampleYear03>
    <rr:ExpenseExampleYear05
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">385</rr:ExpenseExampleYear05>
    <rr:ExpenseExampleYear10
      contextRef="S000006857_C000018529_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">867</rr:ExpenseExampleYear10>
    <rr:ExpenseExampleNoRedemptionByYearCaption contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">If you do not sell your shares:</rr:ExpenseExampleNoRedemptionByYearCaption>
    <rr:ExpenseExampleNoRedemptionYear01
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">132</rr:ExpenseExampleNoRedemptionYear01>
    <rr:ExpenseExampleNoRedemptionYear03
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">423</rr:ExpenseExampleNoRedemptionYear03>
    <rr:ExpenseExampleNoRedemptionYear05
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">735</rr:ExpenseExampleNoRedemptionYear05>
    <rr:ExpenseExampleNoRedemptionYear10
      contextRef="S000006857_C000018528_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="0"
      unitRef="usd">1622</rr:ExpenseExampleNoRedemptionYear10>
    <rr:PortfolioTurnoverHeading contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">Portfolio Turnover

</rr:PortfolioTurnoverHeading>
    <rr:PortfolioTurnoverTextBlock contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         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 228.24% of the average value of its portfolio.


</rr:PortfolioTurnoverTextBlock>
    <rr:PortfolioTurnoverRate
      contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">2.2824</rr:PortfolioTurnoverRate>
    <rr:StrategyHeading contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         Principal Investment Strategies

</rr:StrategyHeading>
    <rr:StrategyNarrativeTextBlock contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">                                                                                                   Under normal market conditions, the Fund invests primarily in debt securities, which may be represented by derivative investments
            that provide exposure to debt securities such as futures, options and swap agreements. The debt securities in which the Fund
            may invest include government and corporate debt securities, mortgage- and asset-backed securities, floating interest rate
            corporate loans and debt securities and municipal securities.

                  Under normal market conditions, the Fund invests primarily in investment grade debt securities and in unrated securities that
            the investment manager deems are of comparable quality. Derivatives whose reference securities are investment grade are considered
            by the Fund to be investment grade. 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 also may invest up to 20% of its total assets in non-investment grade securities, including up to 5% in securities
            rated lower than B- by S&amp;P&#xae; Global Ratings (S&amp;P) or Moody's Investors Services (Moody's), which may include defaulted securities. (In calculating the
            above non-investment grade debt limitations, the Fund combines its non-investment grade debt securities with the net long
            and short exposure to non-investment grade debt securities from derivative instruments.) Excluding derivatives, the Fund invests
            no more than 33% of its total assets in non-investment grade debt securities, including no more than 5% in securities rated
            lower than B- by S&amp;P or Moody's, which may include defaulted securities. For purposes of the credit limitations above, non-investment
            grade debt securities include unrated securities that the investment manager deems are of comparable quality. The Fund's investments
            in marketplace loans are not subject to the 5% limitations described above.

                  The Fund may invest up to 25% of its total assets in foreign securities, including up to 20% of its total assets in non-U.S.
            dollar denominated securities and up to 10% of its total assets in emerging market securities.

                  The Fund may invest a portion of its assets in marketplace loans to consumers and small and mid-sized enterprises or companies
            (SMEs), which may include loans for individual leases, that may be originated through online lending platforms.

                  The Fund may invest in many different securities issued or guaranteed by the U.S. government or by non-U.S. governments, or
            their respective agencies or instrumentalities, including mortgage-backed securities and inflation-indexed securities issued
            by the U.S. Treasury. Mortgage-backed securities represent an interest in a pool of mortgage loans made by banks and other
            financial institutions to finance purchases of homes, commercial buildings and other real estate. The individual mortgage
            loans are packaged or "pooled" together for sale to investors. As the underlying mortgage loans are paid off, investors receive
            principal and interest payments. These securities may be fixed-rate or adjustable-rate mortgage-backed securities (ARMS).
            The Fund may purchase or sell mortgage-backed securities on a delayed delivery or forward commitment basis through the "to-be-announced"
            (TBA) market. With TBA transactions, the particular securities to be delivered must meet specified terms and standards. The
            Fund may also invest a small portion of its assets directly in mortgage loans.

                  To pursue its investment goal, the Fund regularly enters into various derivative transactions, including currency forwards,
            currency, interest rate/bond futures contracts and options on interest rate futures contracts, options on exchange-traded
            funds, swap agreements, including interest rate, fixed income total return, currency and credit default swaps, options on
            interest rate and credit default swap agreements. The use of these derivative transactions may allow the Fund to obtain net
            long or short exposures to select currencies, interest rates, countries, duration 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 in mortgage dollar rolls. In a mortgage dollar roll, the Fund sells mortgage-backed securities for delivery
            in the current month and simultaneously contracts to repurchase substantially similar (same type, coupon, and maturity) securities
            on a specified future date. During the period between the sale and repurchase, the Fund forgoes principal and interest paid
            on the mortgage-backed securities. The Fund earns money on a mortgage dollar roll from any difference between the sale price
            and the future purchase price, as well as the interest earned on the cash proceeds of the initial sale.

                  The Fund may invest a significant portion of its assets in structured fixed income securities, such as collateralized debt
            obligations (&#x93;CDOs&#x94;), which are generally a type of asset-backed securities. The Fund's investments in CDOs may
            include investments in collateralized loan obiligations (CLOs), which are a type of CDO.

                  In pursuing its investment goals, the Fund may gain exposure to particular investments by investing directly in securities
            or other instruments or by investing in other mutual funds or exchange-traded funds that provide exposure to such investments.

                  In choosing investments, the Fund&#x92;s investment manager selects securities in various market sectors based on the investment
            manager&#x92;s assessment of changing economic, market, industry and issuer conditions. The investment manager uses a &#x93;top-down&#x94;
            analysis of macroeconomic trends, combined with a &#x93;bottom-up&#x94; fundamental analysis of market sectors, industries
            and issuers, to try to take advantage of varying sector reactions to economic events.


</rr:StrategyNarrativeTextBlock>
    <rr:RiskHeading contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         Principal Risks

</rr:RiskHeading>
    <rr:RiskNarrativeTextBlock contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">                  You could lose money by investing in the Fund. Mutual fund 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.

                  Interest Rate&#160;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.

         Credit&#160;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.

         Mortgage Securities and Asset-Backed Securities&#160;Mortgage securities differ from conventional debt securities because principal is paid back periodically over the life of
            the security rather than at maturity. The Fund may receive unscheduled payments of principal due to voluntary prepayments,
            refinancings or foreclosures on the underlying mortgage loans. Because of prepayments, mortgage securities may be less effective
            than some other types of debt securities as a means of "locking in" long-term interest rates and may have less potential for
            capital appreciation during periods of falling interest rates. A reduction in the anticipated rate of principal prepayments,
            especially during periods of rising interest rates, may increase or extend the effective maturity of mortgage securities,
            making them more sensitive to interest rate changes, subject to greater price volatility, and more susceptible than some other
            debt securities to a decline in market value when interest rates rise.

         Issuers of asset-backed securities may have limited ability to enforce the security interest in the underlying assets, and
            credit enhancements provided to support the securities, if any, may be inadequate to protect investors in the event of default.
            Like mortgage securities, asset-backed securities are subject to prepayment and extension risks.

         High-Yield Debt Securities&#160;Issuers of lower-rated or &#x93;high-yield&#x94; debt securities (also known as &#x93;junk bonds&#x94;) are not as strong
            financially as those issuing higher credit quality debt securities. High-yield debt securities are generally considered predominantly
            speculative by the applicable rating agencies as their issuers are more likely to encounter financial difficulties because
            they may be more highly leveraged, or because of other considerations. In addition, high yield debt securities generally are
            more vulnerable to changes in the relevant economy, such as a recession or a sustained period of rising interest rates, that
            could affect their ability to make interest and principal payments when due. The prices of high-yield debt securities generally
            fluctuate more than those of higher credit quality. High-yield debt securities are generally more illiquid (harder to sell)
            and harder to value.

         Floating Rate Corporate Investments&#160;Floating rate corporate loans and corporate debt securities generally have credit ratings below investment grade and may be
            subject to resale restrictions. They are often issued in connection with highly leveraged transactions, and may be subject
            to greater credit risks than other investments including the possibility of default or bankruptcy. In addition, a secondary
            market in corporate loans may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement
            periods, which may impair the ability to accurately value existing and prospective investments and to realize in a timely
            fashion the full value upon the sale of a corporate loan. A significant portion of floating rate investments may be &#x93;covenant
            lite&#x94; loans that may contain fewer or less restrictive constraints on the borrower or other borrower-friendly characteristics.

         Derivative Instruments&#160;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 the underlying instrument, in addition
            to other risks. Derivatives involve costs and can create economic leverage in the Fund&#x92;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&#x92;s
            initial investment. Certain derivatives have the potential for unlimited loss, regardless of the size of the 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, index or other risk being hedged. Derivatives also may present the risk that the other
            party to the transaction will fail to perform.

         Collateralized Debt Obligations (CDOs)&#160;The risks of an investment in a CDO, a type of asset backed security and which includes collateralized loan obligations (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&#x92;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.

         Income&#160;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.

         Marketplace Loans&#160;Marketplace loans are subject to the risks associated with debt investments generally, including but not limited to, interest
            rate, credit, liquidity, high yield debt, market and income risks.  Marketplace loans generally are not rated by rating agencies,
            are often unsecured, and are highly risky and speculative investments.  Lenders and investors, such as the Fund, assume all
            of the credit risk on the loans they fund or purchase and there are no assurances that payments due on underlying loans will
            be made. In addition, investments in marketplace loans may be adversely affected if the platform operator or a third-party
            service provider becomes unable or unwilling to fulfill its obligations in servicing the loans. Moreover, the Fund may have
            limited information about the underlying marketplace loans and information provided to the platform regarding the loans and
            the borrowers&#x92; credit information may be incomplete, inaccurate or outdated. It also may be difficult for the Fund to
            sell an investment in a marketplace loan before maturity at the price at which the Fund believes the loan should be valued
            because these loans typically are considered by the Fund to be illiquid securities.

         Foreign Securities (non-U.S.)&#160;Investing in foreign securities typically involves more risks than investing in U.S. securities, including risks related to
            currency exchange rates and policies, country or government specific issues, less favorable trading practices or regulation
            and greater price volatility. Certain of these risks also may apply to securities of U.S. companies with significant foreign
            operations.

         Currency Management Strategies&#160;Currency management strategies may substantially change the Fund&#x92;s exposure to currency exchange rates and could result
            in losses to the Fund if currencies do not perform as the investment manager expects. In addition, currency management strategies,
            to the extent that they reduce the Fund&#x92;s exposure to currency risks, also reduce the Fund&#x92;s ability to benefit
            from favorable changes in currency exchange rates. Using currency management strategies for purposes other than hedging further
            increases the Fund&#x92;s exposure to foreign investment losses. Currency markets generally are not as regulated as securities
            markets. In addition, currency rates may fluctuate significantly over short periods of time, and can reduce returns.

         Sovereign Debt Securities&#160;Sovereign debt securities are subject to various risks in addition to those relating to debt securities and foreign investments
            generally, including, but not limited to, the risk that a governmental entity may be unwilling or unable to pay interest and
            repay principal on its sovereign debt, or otherwise meet its obligations when due because of cash flow problems, insufficient
            foreign reserves, the relative size of the debt service burden to the economy as a whole, the government&#x92;s policy towards
            principal international lenders such as the International Monetary Fund, or the political considerations to which the government
            may be subject. If a sovereign debtor defaults (or threatens to default) on its sovereign debt obligations, the indebtedness
            may be restructured. Some sovereign debtors have in the past been able to restructure their debt payments without the approval
            of some or all debt holders or to declare moratoria on payments. In the event of a default on sovereign debt, the Fund may
            also have limited legal recourse against the defaulting government entity.

         Emerging Market Countries&#160;The Fund&#x92;s investments  in emerging market countries are subject to all of the risks of foreign investing generally,
            and have additional heightened risks due to a lack of established legal, political, business and social frameworks to support
            securities and currency markets, including: delays in settling portfolio transactions; currency and capital controls; greater
            sensitivity to interest rate changes; pervasiveness of corruption and crime; currency exchange rate volatility; and inflation,
            deflation or currency devaluation.

         Extension&#160;Some debt securities, particularly mortgage-backed securities, are subject to the risk that the debt security&#x92;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.

         Investing in Underlying Investment Companies&#160;To the extent the Fund invests in underlying investment companies, including ETFs, the Fund&#x92;s performance is related
            to the performance of the underlying investment companies held by it. In addition, shareholders of the Fund will indirectly
            bear the fees and expenses of the underlying investment companies and such investments may be more costly than if the Fund
            had owned the underlying securities directly. In addition, the Fund pays brokerage commissions in connection with the purchase
            and sale of shares of ETFs.

         Prepayment&#160;Prepayment risk occurs when a debt security can be repaid in whole or in part prior to the security's maturity and the Fund
            must reinvest the proceeds it receives, during periods of declining interest rates, in securities that pay a lower rate of
            interest. Also, if a security has been purchased at a premium, the value of the premium would be lost in the event of prepayment.
            Prepayments generally increase when interest rates fall.

         Mortgage Dollar Rolls&#160;In a mortgage dollar roll, the Fund takes the risk that: the market price of the mortgage securities will drop below their
            future repurchase price; the securities that it repurchases at a later date will have less favorable market characteristics;
            the other party to the agreement will not be able to perform; the roll adds leverage to the Fund's portfolio; and, it increases
            the Fund's sensitivity to interest rate changes. In addition, investment in mortgage dollar rolls may increase the portfolio
            turnover rate for the Fund.

         Liquidity&#160;From time to time, the trading market for a particular security or type of security or other investments in which the Fund
            invests may become less liquid or even illiquid. Reduced liquidity will have an adverse impact on the Fund&#x92;s ability
            to sell such securities or other investments when necessary to meet the Fund&#x92;s liquidity needs, which may arise or increase
            in response to a specific economic event or because the investment manager wishes to purchase particular investments or believes
            that a higher level of liquidity would be advantageous. Reduced liquidity will also generally lower the value of such securities
            or other investments. Market prices for such securities or other investments may be relatively volatile.

         Variable Rate Securities&#160;Because changes in interest rates on variable rate securities (including floating rate securities) may lag behind changes
            in market rates, the value of such securities may decline during periods of rising interest rates until their interest rates
            reset to market rates. During periods of declining interest rates, because the interest rates on variable rate securities
            generally reset downward, their market value is unlikely to rise to the same extent as the value of comparable fixed rate
            securities.


         Market&#160;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.

         The current global outbreak of the novel strain of coronavirus, COVID-19, has resulted in market closures and dislocations,
            extreme volatility, liquidity constraints and increased trading costs. Efforts to contain the spread of COVID-19 have resulted
            in global travel restrictions and disruptions of healthcare systems, business operations and supply chains, layoffs, reduced
            consumer demand, defaults and credit ratings downgrades, and other significant economic impacts. The effects of COVID-19 have
            impacted global economic activity across many industries and may heighten other pre-existing political, social and economic
            risks, locally or globally. The full impact of the COVID-19 pandemic is unpredictable and may adversely affect the Fund&#x92;s
            performance.

         LIBOR Transition&#160;The Fund invests in financial instruments that may have floating or variable rate calculations for payment obligations or
            financing terms based on the London Interbank Offered Rate (LIBOR), which is the benchmark interest rate at which major global
            banks lend to one another in the international interbank market for short-term loans.  It is currently anticipated that LIBOR
            will be discontinued by the end of 2021 and will cease to be published after that time (although there are initiatives to
            delay the discontinuation beyond 2021 for certain LIBOR rates).  The impact of the discontinuation of LIBOR and the transition
            to an alternative rate on the Fund&#x92;s portfolio remains uncertain.  There can be no guarantee that financial instruments
            that transition to an alternative reference rate will retain the same value or liquidity as they would otherwise have had.

         Management&#160;The Fund is subject to management risk because it is an actively managed investment portfolio. 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.

         Portfolio Turnover&#160;The investment manager will sell a security when it believes it is appropriate to do so, regardless of how long the Fund has
            held the security. The Fund's turnover rate may exceed 100% per year because of the anticipated use of certain investment
            strategies. The rate of portfolio turnover will not be a limiting factor for the investment manager in making decisions on
            when to buy or sell securities, including entering into mortgage dollar rolls. High turnover will increase the Fund's transaction
            costs and may increase your tax liability if the transactions result in capital gains.


</rr:RiskNarrativeTextBlock>
    <rr:BarChartAndPerformanceTableHeading contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         Performance

</rr:BarChartAndPerformanceTableHeading>
    <rr:PerformanceNarrativeTextBlock contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">                  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 for Class A shares. 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. 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 franklintempleton.com or by calling (800) DIAL BEN/342-5236.

                  Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.

</rr:PerformanceNarrativeTextBlock>
    <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">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 for Class A shares. 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.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
    <rr:PerformancePastDoesNotIndicateFuture contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the
               future.</rr:PerformancePastDoesNotIndicateFuture>
    <rr:PerformanceAvailabilityWebSiteAddress contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">franklintempleton.com</rr:PerformanceAvailabilityWebSiteAddress>
    <rr:PerformanceAvailabilityPhone contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">(800) DIAL BEN/342-5236</rr:PerformanceAvailabilityPhone>
    <rr:BarChartDoesNotReflectSalesLoads contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.</rr:BarChartDoesNotReflectSalesLoads>
    <rr:BarChartHeading contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         Class A Annual Total Returns

</rr:BarChartHeading>
    <rr:HighestQuarterlyReturnLabel contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member">Best Quarter:</rr:HighestQuarterlyReturnLabel>
    <rr:BarChartHighestQuarterlyReturnDate contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member">2020-06-30</rr:BarChartHighestQuarterlyReturnDate>
    <rr:BarChartHighestQuarterlyReturn
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0730</rr:BarChartHighestQuarterlyReturn>
    <rr:LowestQuarterlyReturnLabel contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member">Worst Quarter:</rr:LowestQuarterlyReturnLabel>
    <rr:BarChartLowestQuarterlyReturnDate contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member">2020-03-31</rr:BarChartLowestQuarterlyReturnDate>
    <rr:BarChartLowestQuarterlyReturn
      contextRef="S000006857_C000018526_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">-0.0413</rr:BarChartLowestQuarterlyReturn>
    <rr:PerformanceTableHeading contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">         Average Annual Total Returns(figures reflect sales charges)

                  For the periods ended December 31, 2020

</rr:PerformanceTableHeading>
    <rr:AverageAnnualReturnLabel contextRef="S000006857_C000018526_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member">Return Before Taxes</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006857_C000018526_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0318</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006857_C000018526_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0330</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006857_C000018526_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0334</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006857_C000018526_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member">Return After Taxes on Distributions</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006857_C000018526_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0191</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006857_C000018526_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0217</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006857_C000018526_AfterTaxesOnDistributions_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0193</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnLabel contextRef="S000006857_C000018526_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member">Return After Taxes on Distributions and Sale of Fund Shares</rr:AverageAnnualReturnLabel>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006857_C000018526_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0186</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006857_C000018526_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0202</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006857_C000018526_AfterTaxesOnDistributionsAndSales_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0196</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006857_C000018528_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0570</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006857_C000018528_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0369</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006857_C000018528_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0332</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006857_C000018530_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0694</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006857_C000018530_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0385</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006857_C000018530_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0347</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006857_C000128883_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0759</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006857_C000128883_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0449</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnSinceInception
      contextRef="S000006857_C000128883_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      id="id_footnote_elem_221223843_894"
      unitRef="pure">0.0323</rr:AverageAnnualReturnSinceInception>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006857_C000018529_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0737</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
      contextRef="S000006857_C000018529_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0434</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006857_C000018529_ReturnBeforeTaxes_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0398</rr:AverageAnnualReturnYear10>
    <rr:AverageAnnualReturnYear01
      contextRef="S000006857_IndexBM0838_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0751</rr:AverageAnnualReturnYear01>
    <rr:AverageAnnualReturnYear05
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      decimals="4"
      unitRef="pure">0.0443</rr:AverageAnnualReturnYear05>
    <rr:AverageAnnualReturnYear10
      contextRef="S000006857_IndexBM0838_FranklinInvestorsSecuritiesTrustFIST235Member"
      decimals="4"
      unitRef="pure">0.0384</rr:AverageAnnualReturnYear10>
    <rr:PerformanceTableClosingTextBlock contextRef="S000006857_FranklinInvestorsSecuritiesTrustFIST235Member">                  The figures in the average annual total returns table above reflect the Class A maximum front-end sales charge of 3.75%. Prior
            to March 1, 2019, Class A shares were subject to a maximum front-end sales charge of 4.25%. If the prior maximum front-end
            sales charge of 4.25% was reflected, performance for Class A in the average annual total returns table would be lower.

                  The after-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not
            reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ
            from those shown. After-tax returns are not relevant to investors who hold their Fund shares through tax-deferred arrangements,
            such as 401(k) plans or individual retirement accounts. After-tax returns are shown only for Class A and after-tax returns
            for other classes will vary.


</rr:PerformanceTableClosingTextBlock>
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            or More" under "Choosing a Share Class") and purchases by certain retirement plans without an initial sales charge on shares
            sold within 18 months of purchase.
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            which reflect the operating expenses of the Fund and do not include acquired fund fees and expenses.
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            Templeton money fund (acquired fund) for at least one year following the date of this prospectus. In addition, the transfer
            agent has contractually agreed to cap transfer agency fees for Class R6 shares of the Fund so that transfer agency fees for
            that class of the Fund do not exceed 0.03% until February 28, 2022. Contractual fee waiver and/or expense reimbursement agreements
            may not be changed or terminated during the time period set forth above.
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            agreement may not be terminated or amended without approval of the board of trustees except to add series and classes, to
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