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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FRANKLIN INVESTORS SECURITIES TRUST
Prospectus Date rr_ProspectusDate Sep. 10, 2018
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock To maximize total return by emphasizing high current income and long-term capital appreciation, consistent with reasonable risk.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

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 “Your Account” on page 104 in the Fund's Prospectus and under “Buying and Selling Shares” on page 80 of the Fund’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.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 27.18% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 27.18%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock 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:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If you do not sell your shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund normally invests at least 80% of its net assets in equity securities, including securities convertible into common stocks. The Fund may also invest up to 20% of its net assets in debt securities, including any combination of the following investments: corporate, agency and government bonds issued in the United States and other countries; notes and debentures (collectively with bonds referred to as debt securities). The Fund generally invests greater than 80% of its net assets in common stocks, and the remainder of its assets in other instruments such as convertible securities and debt securities.

The Fund may invest in foreign securities including emerging markets, but does not currently anticipate investing more than 25% of its total assets in securities of issuers domiciled outside the United States.

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’s strategy is to invest in a broadly diversified portfolio of equity securities that the Fund’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, asset value, and cash flow potential. The investment manager also considers a company's price/earnings ratio, profit margins, balance sheet and liquidation value. The Fund’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.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

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

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.

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.

Blend Style Investing

A “blend” 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’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.

Income

Because the Fund can only distribute what it earns, the Fund's distributions to shareholders may decline when prevailing interest rates fall, when dividend income from investments in stocks decline, or when the Fund experiences defaults on debt securities it holds.

Focus

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.

Foreign Securities (non-U.S.)

Investing in foreign securities, including sovereign debt 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. The risks of investing in foreign securities are typically greater in less developed or emerging market countries.

Convertible Securities

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

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

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.

Management

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.

High-Yield Debt Securities

Issuers of lower-rated or “high-yield” debt securities (also known as “junk bonds”) 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance from year to year 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.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) DIAL BEN/342-5236
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress franklintempleton.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Class A Annual Total Returns
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter:Q3'0914.46%
Worst Quarter:Q4'08-18.98%
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns
(figures reflect sales charges)

For the periods ended December 31, 2017
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

Historical performance Advisor Class shares prior to their inception is based on the performance of Class A shares. Advisor Class 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.

The figures in the average annual total returns table above reflect the Class A maximum front-end sales charge of 5.75% that was in effect prior to September 10, 2018. Class A shares, however, currently are subject to a maximum front-end sales charge of 5.50% effective on September 10, 2018. If the maximum front-end sales charge of 5.50% was reflected, performance for Class A in the average annual total returns table would be higher.
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice 5.50% [1]
Maximum Deferred Sales Charge (Load) (as percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets 0.46%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.13% [2]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.85% [2],[3]
1 year rr_ExpenseExampleYear01 $ 632
3 years rr_ExpenseExampleYear03 806
5 years rr_ExpenseExampleYear05 995
10 years rr_ExpenseExampleYear10 $ 1,541
2008 rr_AnnualReturn2008 (35.36%)
2009 rr_AnnualReturn2009 26.42%
2010 rr_AnnualReturn2010 15.86%
2011 rr_AnnualReturn2011 1.47%
2012 rr_AnnualReturn2012 11.85%
2013 rr_AnnualReturn2013 29.28%
2014 rr_AnnualReturn2014 9.12%
2015 rr_AnnualReturn2015 (0.90%)
2016 rr_AnnualReturn2016 11.75%
2017 rr_AnnualReturn2017 15.96%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.46%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.98%)
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none [4]
Maximum Deferred Sales Charge (Load) (as percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [4]
Management fees rr_ManagementFeesOverAssets 0.46%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.13% [2]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 1.60% [2],[3]
1 year rr_ExpenseExampleYear01 $ 263
3 years rr_ExpenseExampleYear03 505
5 years rr_ExpenseExampleYear05 871
10 years rr_ExpenseExampleYear10 1,900
1 Year rr_ExpenseExampleNoRedemptionYear01 163
3 Years rr_ExpenseExampleNoRedemptionYear03 505
5 Years rr_ExpenseExampleNoRedemptionYear05 871
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,900
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.46%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.48%
Other expenses rr_OtherExpensesOverAssets 0.13% [2]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 1.08% [2],[3]
1 year rr_ExpenseExampleYear01 $ 110
3 years rr_ExpenseExampleYear03 343
5 years rr_ExpenseExampleYear05 595
10 years rr_ExpenseExampleYear10 $ 1,317
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.46%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.05% [2]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.52% [2],[3]
1 year rr_ExpenseExampleYear01 $ 53
3 years rr_ExpenseExampleYear03 167
5 years rr_ExpenseExampleYear05 291
10 years rr_ExpenseExampleYear10 $ 653
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price) rr_MaximumCumulativeSalesChargeOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as percentage of the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.46%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.13% [2]
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [3]
Total annual Fund operating expenses rr_ExpensesOverAssets 0.60% [2],[3]
1 year rr_ExpenseExampleYear01 $ 61
3 years rr_ExpenseExampleYear03 192
5 years rr_ExpenseExampleYear05 335
10 years rr_ExpenseExampleYear10 $ 750
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | Return Before Taxes | Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Franklin Equity Income Fund
Label rr_AverageAnnualReturnLabel Return Before Taxes
Past 1 year rr_AverageAnnualReturnYear01 9.28%
Past 5 years rr_AverageAnnualReturnYear05 11.29%
Past 10 years rr_AverageAnnualReturnYear10 6.26%
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | Return Before Taxes | Class C  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 14.07%
Past 5 years rr_AverageAnnualReturnYear05 11.79%
Past 10 years rr_AverageAnnualReturnYear10 6.09%
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | Return Before Taxes | Class R  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 15.68%
Past 5 years rr_AverageAnnualReturnYear05 12.35%
Past 10 years rr_AverageAnnualReturnYear10 6.61%
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | Return Before Taxes | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 16.41%
Past 10 years rr_AverageAnnualReturnYear10
Since Inception rr_AverageAnnualReturnSinceInception 11.52% [5]
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | Return Before Taxes | Advisor Class  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 16.26%
Past 5 years rr_AverageAnnualReturnYear05 12.92%
Past 10 years rr_AverageAnnualReturnYear10 7.16%
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | After Taxes on Distributions | Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Franklin Equity Income Fund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
Past 1 year rr_AverageAnnualReturnYear01 8.03%
Past 5 years rr_AverageAnnualReturnYear05 9.87%
Past 10 years rr_AverageAnnualReturnYear10 5.33%
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | After Taxes on Distributions and Sales | Class A  
Risk/Return: rr_RiskReturnAbstract  
Column rr_AverageAnnualReturnColumnName Franklin Equity Income Fund
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Past 1 year rr_AverageAnnualReturnYear01 6.22%
Past 5 years rr_AverageAnnualReturnYear05 8.76%
Past 10 years rr_AverageAnnualReturnYear10 4.88%
Franklin Investors Securities Trust - FIST1-23 | Franklin Equity Income Fund | S&P 500® Index (index reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Past 1 year rr_AverageAnnualReturnYear01 21.83%
Past 5 years rr_AverageAnnualReturnYear05 15.79%
Past 10 years rr_AverageAnnualReturnYear10 8.50%
[1] There is a 1% contingent deferred sales charge that applies to investments of $1 million or more (see "Investments of $1 Million 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.
[2] Other expenses of the Fund have been restated to exclude non-recurring prior period expenses and for Class R6 shares, to reflect current fiscal year expenses. If the non-recurring prior period expenses were included in the table above, the amounts stated would have been greater. Consequently, the total annual Fund operating expenses differ from the ratio of expenses to average net assets shown in the Financial Highlights.
[3] Total annual Fund operating expenses differ from the ratio of expenses to average net assets shown in the Financial Highlights, which reflect the operating expenses of the Fund and do not include acquired fund fees and expenses.
[4] Effective October 5, 2018, Class C shares that have been held for 10 years or more will convert automatically into Class A shares later in the month of October 2018 and will be subject to Class A shares’ lower Rule 12b-1 fees. Thereafter, Class C shares of the Fund will convert automatically to Class A shares of the Fund on a monthly basis in the month of, or the month following, the 10-year anniversary of the Class C shares’ purchase date. Such conversions will be on the basis of the relative net asset values of the two classes, will not be subject to Class A shares’ sales charges and are not expected to be a taxable event for federal income tax purposes. Certain shares that are invested through retirement plans, omnibus accounts or in certain other instances may not automatically convert if the financial intermediary does not have the ability to track purchases to credit individual shareholders’ holding periods. (See “Your Account – Choosing a Shares Class – Sales Charges - Class C – Automatic Conversion of Class C Shares to Class A Shares After 10-Year Holding Period” for more information.)
[5] Since inception May 1, 2013.