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Risk/Return:

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Registrant Name

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FRANKLIN CUSTODIAN FUNDS

Prospectus Date

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Feb. 01, 2015

Risk/Return [Heading]

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Fund Summary

Franklin Custodian Funds-14 | Franklin Utilities Fund

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

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Investment Goal

Objective, Primary [Text Block]

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Capital appreciation and current income.

Expense [Heading]

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Fees and Expenses of the Fund

Expense Narrative [Text Block]

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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 “Your Account” on page 107 in the Fund's Prospectus and under “Buying and Selling Shares” on page 70 of the Fund’s Statement of Additional Information.

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

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Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Heading]

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Portfolio Turnover

Portfolio Turnover [Text Block]

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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 8.10% of the average value of its portfolio.

Portfolio Turnover, Rate

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Expense Breakpoint Discounts [Text]

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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.

Expense Breakpoint, Minimum Investment Required [Amount]

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Expense Example [Heading]

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Example

Expense Example Narrative [Text Block]

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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. 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]

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If you do not sell your shares:

Strategy [Heading]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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Under normal market conditions, the Fund invests at least 80% of its net assets in the securities of public utilities companies. These are companies that provide electricity, natural gas, water, and communications services to the public and companies that provide services to public utilities companies. The Fund concentrates (invests more than 25% of its total assets) in companies operating in the utilities industry. The Fund invests primarily in equity securities, which consist mainly of common stocks.

The Fund searches for the best return opportunities available in the global utilities arena with a specific focus on the U.S. electricity and gas sector. Generally, the Fund seeks to invest in companies producing a high percentage of earnings from their regulated operations.

Strategy Portfolio Concentration [Text]

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Under normal market conditions, the Fund invests at least 80% of its net assets in the securities of public utilities companies.

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Principal Risks

Risk Narrative [Text Block]

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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.

Utilities Industry

Utility company equity securities, to the extent they are purchased for their dividend yield, historically have been sensitive to interest rate movements: when interest rates have risen, the stock prices of these companies have tended to fall. In some states, utility companies and their rates are regulated; other states have moved to deregulate such companies thereby causing non-regulated companies’ returns to generally be more volatile and more sensitive to changes in revenue and earnings. Certain utilities companies face risks associated with the operation of nuclear facilities for electric generation, including, among other considerations, litigation, the problems associated with the use of radioactive materials and the effects of natural or man-made disasters. In general, all utility companies may face additional regulation and litigation regarding their power plant operations; increased costs from new or greater regulation of these operations; the need to purchase expensive emissions control equipment or new operations due to regulations; and the availability and cost of fuel, all of which may lower their earnings.

Market

The market values of securities or other investments owned by the Fund will go up or down, sometimes rapidly or unpredictably. A security’s market value 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 securities. 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.

Concentration

By focusing on an industry or a group of 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.

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.

Bar Chart and Performance Table [Heading]

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Performance

Performance Narrative [Text Block]

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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 more closely with the Fund's investment strategies.

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]

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(800) DIAL BEN/342-5236

Performance Availability Website Address [Text]

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franklintempleton.com

Performance Past Does Not Indicate Future [Text]

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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]

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Class A Annual Total Returns

Bar Chart Does Not Reflect Sales Loads [Text]

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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]

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Best Quarter:	Q3'10	12.21%
Worst Quarter:	Q3'08	-13.14%

Performance Table Heading

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Average Annual Total Returns
(figures reflect sales charges)

For the periods ended December 31, 2014

Performance Table Closing [Text Block]

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No one index is representative of the Fund's portfolio.

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.

Franklin Custodian Funds-14 | Franklin Utilities Fund | Class A

Risk/Return:

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Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)

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Maximum Deferred Sales Charge (Load) (as percentage of the lower of original purchase price or sale proceeds)

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none

^[1]

Management fees

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Distribution and service (12b-1) fees

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Total annual Fund operating expenses

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Annual Return 2013

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Annual Return 2014

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Highest Quarterly Return, Label

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Best Quarter:

Highest Quarterly Return, Date

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Sep. 30, 2010

Highest Quarterly Return

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Lowest Quarterly Return, Label

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Worst Quarter:

Lowest Quarterly Return, Date

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Sep. 30, 2008

Lowest Quarterly Return

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Franklin Custodian Funds-14 | Franklin Utilities Fund | Class C

Risk/Return:

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Maximum Sales Charge (Load) Imposed on Purchases (as percentage of offering price)

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none

Maximum Deferred Sales Charge (Load) (as percentage of the lower of original purchase price or sale proceeds)

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^[1]

Management fees

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Distribution and service (12b-1) fees

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Total annual Fund operating expenses

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Expense Example, No Redemption, 1 Year

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Expense Example, No Redemption, 3 Years

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Expense Example, No Redemption, 5 Years

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Expense Example, No Redemption, 10 Years

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Franklin Custodian Funds-14 | Franklin Utilities Fund | Class R

Risk/Return:

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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)

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none

^[1]

Management fees

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Distribution and service (12b-1) fees

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rr_OtherExpensesOverAssets

Total annual Fund operating expenses

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rr_ExpenseExampleYear03

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rr_ExpenseExampleYear10

Franklin Custodian Funds-14 | Franklin Utilities Fund | Class R6

Risk/Return:

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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

^[1]

Management fees

rr_ManagementFeesOverAssets

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

Total annual Fund operating expenses

rr_ExpensesOverAssets

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Franklin Custodian Funds-14 | Franklin Utilities Fund | Advisor Class

Risk/Return:

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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

^[1]

Management fees

rr_ManagementFeesOverAssets

Distribution and service (12b-1) fees

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none

rr_OtherExpensesOverAssets

Total annual Fund operating expenses

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rr_ExpenseExampleYear10

Franklin Custodian Funds-14 | Franklin Utilities Fund | Return Before Taxes | Class A

Risk/Return:

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Franklin Utilities Fund

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Return Before Taxes

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rr_AverageAnnualReturnYear05

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Franklin Custodian Funds-14 | Franklin Utilities Fund | Return Before Taxes | Class C

Risk/Return:

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Franklin Custodian Funds-14 | Franklin Utilities Fund | Return Before Taxes | Class R

Risk/Return:

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Franklin Custodian Funds-14 | Franklin Utilities Fund | Return Before Taxes | Class R6

Risk/Return:

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^[2]

Franklin Custodian Funds-14 | Franklin Utilities Fund | Return Before Taxes | Advisor Class

Risk/Return:

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Franklin Custodian Funds-14 | Franklin Utilities Fund | Return After Taxes on Distributions | Class A

Risk/Return:

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Franklin Utilities Fund

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Return After Taxes on Distributions

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Franklin Custodian Funds-14 | Franklin Utilities Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class A

Risk/Return:

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Franklin Utilities Fund

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Return After Taxes on Distributions and Sale of Fund Shares

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Franklin Custodian Funds-14 | Franklin Utilities Fund | S&P 500® Utilities Index (index reflects no deduction for fees, expenses or taxes)

Risk/Return:

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Franklin Custodian Funds-14 | Franklin Utilities Fund | S&P 500® Index (index reflects no deduction for fees, expenses or taxes)

Risk/Return:

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[1]	There is a 0.75% 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.
[2]	Since inception May 01, 2013.