Annual Total Returns - AMERICAN CENTURY MUNICIPAL TRUST |
12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| HIGH-YIELD MUNICIPAL FUND | HIGH-YIELD MUNICIPAL FUND, INVESTOR CLASS | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 2.95% | 5.39% | 5.89% | (13.10%) | 5.86% | 4.65% | 9.39% | 1.46% | 9.24% | 0.46% |
| INTERMEDIATE-TERM TAX-FREE BOND FUND | INTERMEDIATE-TERM TAX-FREE BOND FUND, INVESTOR CLASS | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 4.52% | 1.65% | 5.43% | (7.89%) | 2.00% | 4.76% | 6.70% | 0.92% | 4.77% | (0.37%) |
| TAX-FREE MONEY MARKET FUND | TAX-FREE MONEY MARKET FUND, INVESTOR CLASS | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 2.36% | 3.06% | 3.01% | 0.84% | 0.01% | 0.36% | 1.05% | 1.01% | 0.45% | 0.14% |