S000000546 [Member] Annual Total Returns |
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 |
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| Nuveen Colorado Municipal Bond Fund | Nuveen Colorado Municipal Bond Fund - Class A | ||||||||||||
| Prospectus [Line Items] | ||||||||||||
| Annual Return [Percent] | [1] | 2.51% | 2.01% | 6.11% | (10.17%) | 1.51% | 5.29% | 7.70% | 0.86% | 5.78% | 0.28% | |
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