S000000555 [Member] Average Annual Total Returns

12 Months Ended

60 Months Ended

120 Months Ended

143 Months Ended

376 Months Ended

468 Months Ended

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

S&P Municipal Bond Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

4.26%

1.06%

2.44%

S&P Municipal Bond Massachusetts Index (reflects no deduction for fees, expenses or taxes)

Prospectus [Line Items]

Average Annual Return, Percent

^[2]

4.15%

0.73%

2.11%

Lipper Massachusetts Municipal Debt Funds Classification Average (reflects no deduction for taxes or sales loads)

Prospectus [Line Items]

Average Annual Return, Percent

^[3]

2.87%

(0.03%)

1.42%

Nuveen Massachusetts Municipal Bond Fund - Class A

Prospectus [Line Items]

Average Annual Return, Percent

(2.01%)

(1.10%)

1.17%

Performance Inception Date

Sep. 07, 1994

Nuveen Massachusetts Municipal Bond Fund - Class A | After Taxes on Distributions

Prospectus [Line Items]

Average Annual Return, Percent

(2.01%)

(1.11%)

1.17%

Performance Inception Date

Sep. 07, 1994

Nuveen Massachusetts Municipal Bond Fund - Class A | After Taxes on Distributions and Sales

Prospectus [Line Items]

Average Annual Return, Percent

0.13%

(0.26%)

1.50%

Performance Inception Date

Sep. 07, 1994

Nuveen Massachusetts Municipal Bond Fund - Class I

Prospectus [Line Items]

Average Annual Return, Percent

2.54%

(0.05%)

1.81%

Performance Inception Date

Dec. 22, 1986

Class C

Prospectus [Line Items]

Average Annual Return, Percent

1.58%

(1.05%)

0.96%

Performance Inception Date

Feb. 10, 2014

[1]	An index designed to measure the performance of the tax-exempt U.S. municipal bond market.
[2]	An index designed to measure the performance of the tax-exempt Massachusetts municipal bond market.
[3]	Represents the average annualized total return for all reporting funds in the Lipper Massachusetts Municipal Debt Funds Classification.