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Performance Management - FRANKLIN FEDERAL TAX-FREE INCOME FUND
Apr. 30, 2025
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] Performance
Performance Narrative [Text Block]

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 www.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 Past Does Not Indicate Future [Text] The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] 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.
Bar Chart Does Not Reflect Sales Loads [Text] Sales charges are not reflected in the bar chart, and if those charges were included, returns would be less than those shown.
Bar Chart [Heading] Class A Annual Total Returns
Bar Chart Closing [Text Block]
   

Best Quarter:

2023, Q4

8.15%

Worst Quarter:

2022, Q1

-6.81%

 

As of June 30, 2025, the Fund’s year-to-date return was -1.41%.
Performance Table Heading Average Annual Total Returns (figures reflect sales charges) For periods ended December 31, 2024
Performance [Table]
Average Annual Total Returns - FRANKLIN FEDERAL TAX-FREE INCOME FUND
 12 Months Ended 60 Months Ended 89 Months Ended 120 Months Ended
Apr. 30, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Bloomberg Municipal Bond Index | Average Annual Return, Label [Optional Text] Bloomberg Municipal Bond Index        
Bloomberg Municipal Bond Index | Average Annual Return, Percent   1.05% 0.99%   2.25%
Class A | Average Annual Return, Label [Optional Text] Return before taxes        
Class A | Average Annual Return, Percent   (0.90%) 0.17%   1.46%
Class A | After Taxes on Distributions | Average Annual Return, Label [Optional Text] Return after taxes on distributions        
Class A | After Taxes on Distributions | Average Annual Return, Percent   (0.94%) 0.15%   1.45%
Class A | After Taxes on Distributions and Sales | Average Annual Return, Label [Optional Text] Return after taxes on distributions and sale of Fund shares        
Class A | After Taxes on Distributions and Sales | Average Annual Return, Percent   0.81% 0.80%   1.86%
Class A1 | Average Annual Return, Percent   (0.72%) 0.31%   1.56%
Class C | Average Annual Return, Percent   1.65% 0.55%   1.40%
Class R6 | Average Annual Return, Percent   3.26% 1.23% 1.98% [1]  
Class R6 | Performance Inception Date       Aug. 01, 2017  
Advisor Class | Average Annual Return, Percent   3.31% 1.20%   2.06%
[1]

Since inception August 1, 2017.
Index No Deduction for Fees, Expenses, or Taxes [Text] (index reflects no deduction for fees, expenses or taxes)
Performance Availability Website Address [Text] franklintempleton.com
Performance Availability Phone [Text] (800) DIAL BEN/342-5236
Class A  
Prospectus [Line Items]  
Year to Date Return, Label [Optional Text] As of June 30, 2025, the Fund’s year-to-date return was -1.41%.
Bar Chart, Year to Date Return (1.41%)
Bar Chart, Year to Date Return, Date Jun. 30, 2025
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 8.15%
Highest Quarterly Return, Date Dec. 31, 2023
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (6.81%)
Lowest Quarterly Return, Date Mar. 31, 2022