S000094552 [Member] Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
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| Bloomberg Municipal Bond Index (no deduction for fees, expenses or taxes) | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 1.05% | 0.99% | 2.25% | ||
| Putnam Tax-Free High Yield Fund - Class R6 | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 5.73% | 1.96% | 3.48% | |
| Putnam Tax-Free High Yield Fund - Class R6 | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 5.73% | 1.87% | 3.36% | |
| Putnam Tax-Free High Yield Fund - Class R6 | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 5.08% | 2.32% | 3.53% | |
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