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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 DynaTech Fund

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

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Investment Goal

Objective, Primary [Text Block]

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Capital appreciation.

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 $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 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 26.43% 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 $50,000 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 seeks investments primarily in equity securities of companies that the investment manager believes are leaders in innovation, take advantage of new technologies, have superior management, and benefit from new industry conditions in the dynamically changing global economy. The Fund invests predominantly in common stock.

In pursuing these objectives, the investment manager may invest in companies in any economic sector or of any market capitalization and may invest in companies both inside and outside of the United States. Although the investment manager searches for investments across a large number of sectors, it expects to have significant positions in particular sectors including, for example, technology and health care.

The investment manager uses fundamental, "bottom-up" research to seek companies meeting its criteria of growth potential, quality and valuation. In seeking sustainable growth characteristics, the investment manager looks for companies it believes can produce sustainable earnings and cash flow growth, evaluating the long-term market opportunity and competitive structure of an industry to target leaders and emerging leaders.

Strategy Portfolio Concentration [Text]

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Under normal market conditions, the Fund seeks investments primarily in equity securities of companies that the investment manager believes are leaders in innovation, take advantage of new technologies, have superior management, and benefit from new industry conditions in the dynamically changing global economy.

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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.

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.

Focus

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. The activities of health care companies may be funded or subsidized by federal and state governments and changes in funding may adversely affect the profitability of these companies. Technology and health care companies may also be affected by legislation or changes in government regulation and policies.

Midsize Companies

Securities issued by midsize 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, lack of depth of management and funds for growth and development and limited or less developed product lines and markets.

Foreign Securities

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.

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.

Growth Style Investing

Growth stock prices reflect projections of future earnings or revenues, and can, therefore, fall dramatically if the company fails to meet those projections. Prices of these companies’ securities may be more volatile than other securities, particularly over the short term.

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 indices in the table below show how the Fund's performance compares to other groups of securities that align 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]

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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.

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:	Q1'12	18.69%
Worst Quarter:	Q4'08	-23.41%

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.

Historical performance for Class R and Advisor Class shares prior to their inception is based on the performance of Class A shares. Class R and Advisor Class performance have been adjusted to reflect differences in sales charges and 12b-1 expenses (with respect to Class R only) 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.

Franklin Custodian Funds-14 | Franklin DynaTech 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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Mar. 31, 2012

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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Dec. 31, 2008

Lowest Quarterly Return

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Franklin Custodian Funds-14 | Franklin DynaTech 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

rr_ExpensesOverAssets

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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 DynaTech Fund | Class R

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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none

^[1]

Management fees

rr_ManagementFeesOverAssets

Distribution and service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

rr_OtherExpensesOverAssets

Total annual Fund operating expenses

rr_ExpensesOverAssets

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Franklin Custodian Funds-14 | Franklin DynaTech 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

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none

rr_OtherExpensesOverAssets

Total annual Fund operating expenses

rr_ExpensesOverAssets

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rr_ExpenseExampleYear03

rr_ExpenseExampleYear05

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Franklin Custodian Funds-14 | Franklin DynaTech 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

rr_DistributionAndService12b1FeesOverAssets

none

rr_OtherExpensesOverAssets

Total annual Fund operating expenses

rr_ExpensesOverAssets

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rr_ExpenseExampleYear03

rr_ExpenseExampleYear05

rr_ExpenseExampleYear10

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

Risk/Return:

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Franklin DynaTech Fund

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Return Before Taxes

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rr_AverageAnnualReturnYear05

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

Risk/Return:

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

Risk/Return:

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

Risk/Return:

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rr_AverageAnnualReturnYear01

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^[2]

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

Risk/Return:

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rr_AverageAnnualReturnYear05

rr_AverageAnnualReturnYear10

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

Risk/Return:

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Franklin DynaTech Fund

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Return After Taxes on Distributions

rr_AverageAnnualReturnYear01

rr_AverageAnnualReturnYear05

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

Risk/Return:

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Franklin DynaTech Fund

rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

rr_AverageAnnualReturnYear01

rr_AverageAnnualReturnYear05

rr_AverageAnnualReturnYear10

Franklin Custodian Funds-14 | Franklin DynaTech Fund | Russell 1000® Growth Index (index reflects no deduction for fees, expenses or taxes)

Risk/Return:

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rr_AverageAnnualReturnYear01

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Franklin Custodian Funds-14 | Franklin DynaTech Fund | NASDAQ Composite Index (index reflects no deduction for fees, expenses or taxes)

Risk/Return:

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rr_AverageAnnualReturnYear01

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

Risk/Return:

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[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.
[2]	Since inception May 01, 2013.