S000000285 [Member] Annual Total Returns

12 Months Ended

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

Dec. 31, 2015

Nuveen Intermediate Duration Municipal Bond Fund | Class A

Prospectus [Line Items]

Annual Return [Percent]

^[1]

1.71%

5.51%

(8.31%)

1.77%

4.26%

6.86%

1.36%

6.13%

(0.68%)

2.84%

[1]	Class A year-to-date total return as of June 30, 2025 was 0.74%. The performance of the other share classes will differ due to their different expense structures.