v3.26.1
Shareholder Report
12 Months Ended
May 31, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name Nuveen Multistate Trust IV
Entity Central Index Key 0001018973
Entity Investment Company Type N-1A
Document Period End Date May 31, 2026
C000001667 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Kansas Municipal Bond Fund
Class Name Class I Shares
Trading Symbol FRKSX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class I Shares of the Nuveen Kansas Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class I Shares
  $64    0.62%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 64
Expense Ratio, Percent 0.62% [1]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Kansas Municipal Bond Fund returned 6.94% for Class I Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund outperformed the S&P Municipal Bond Kansas Index, which returned 6.21%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds.
 
Credit-quality positioning, especially an overweight to BBB-rated and BB-rated bonds.
 
Sector positioning, especially an overweight to dedicated-tax bonds.
 
Security selection in the local school district and health care bond sectors, and in Overland Park Convention Center bonds.
 
Top detractors from relative performance
 
An underweight to higher-education bonds.
 
Overland Park Prairiefire development bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class I Shares at NAV
       6.94        1.23        2.05
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Kansas Index
       6.21        1.51        2.30
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 194,548,848
Holdings Count | Holding 151
Advisory Fees Paid, Amount $ 952,272
Investment Company Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 194,548,848  
Total number of portfolio holdings
     151  
Portfolio turnover (%)
     15%  
Total management fees paid for the year
   $ 952,272  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000137705 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Kansas Municipal Bond Fund
Class Name Class C Shares
Trading Symbol FAFOX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class C Shares of the Nuveen Kansas Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class C Shares
  $167    1.62%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 167
Expense Ratio, Percent 1.62% [2]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Kansas Municipal Bond Fund returned 5.90% for Class C Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund underperformed the S&P Municipal Bond Kansas Index, which returned 6.21%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds.
 
Credit-quality positioning, especially an overweight to BBB-rated and BB-rated bonds.
 
Sector positioning, especially an overweight to dedicated-tax bonds.
 
Security selection in the local school district and health care bond sectors, and in Overland Park Convention Center bonds.
 
Top detractors from relative performance
 
An underweight to higher-education bonds.
 
Overland Park Prairiefire development bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class C Shares at NAV (excluding maximum sales charge)
       5.90        0.22        1.19
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Kansas Index
       6.21        1.51        2.30
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 194,548,848
Holdings Count | Holding 151
Advisory Fees Paid, Amount $ 952,272
Investment Company Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 194,548,848  
Total number of portfolio holdings
     151  
Portfolio turnover (%)
     15%  
Total management fees paid for the year
   $ 952,272  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000001664 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Kansas Municipal Bond Fund
Class Name Class A Shares
Trading Symbol FKSTX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class A Shares of the Nuveen Kansas Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class A Shares
  $85    0.82%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 85
Expense Ratio, Percent 0.82% [3]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Kansas Municipal Bond Fund returned 6.71% for Class A Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund outperformed the S&P Municipal Bond Kansas Index, which returned 6.21%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds.
 
Credit-quality positioning, especially an overweight to BBB-rated and BB-rated bonds.
 
Sector positioning, especially an overweight to dedicated-tax bonds.
 
Security selection in the local school district and health care bond sectors, and in Overland Park Convention Center bonds.
 
Top detractors from relative performance
 
An underweight to higher-education bonds.
 
Overland Park Prairiefire development bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1‑Year        5‑Year        10‑Year  
       
Class A Shares at NAV (excluding maximum sales charge)
       6.71        1.03        1.85
       
Class A Shares at maximum sales charge (Offering Price)
       2.20        0.16        1.41
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Kansas Index
       6.21        1.51        2.30
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 194,548,848
Holdings Count | Holding 151
Advisory Fees Paid, Amount $ 952,272
Investment Company Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 194,548,848  
Total number of portfolio holdings
     151  
Portfolio turnover (%)
     15%  
Total management fees paid for the year
   $ 952,272  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000001668 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Kentucky Municipal Bond Fund
Class Name Class A Shares
Trading Symbol FKYTX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class A Shares of the Nuveen Kentucky Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class A Shares
  $120    1.16%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 120
Expense Ratio, Percent 1.16% [4]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Kentucky Municipal Bond Fund returned 7.29% for Class A Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund outperformed the S&P Municipal Bond Kentucky Index, which returned 6.71%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds and an underweight to bonds with durations between two and six years.
 
Credit quality positioning, especially an overweight to non-rated bonds.
 
An underweight to the industrial revenue development bond sector.
 
Top detractors from relative performance
 
Sector positioning, especially an overweight to health care bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class A Shares at NAV (excluding maximum sales charge)
       7.29        0.19        1.63
       
Class A Shares at maximum sales charge (Offering Price)
       2.75        (0.66 )%         1.19
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Kentucky Index
       6.71        1.50        2.51
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 220,120,918
Holdings Count | Holding 98
Advisory Fees Paid, Amount $ 1,072,584
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 220,120,918  
Total number of portfolio holdings
     98  
Portfolio turnover (%)
     13%  
Total management fees paid for the year
   $ 1,072,584  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
  (2)
Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Exposure Basis Explanation [Text Block] Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000137706 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Kentucky Municipal Bond Fund
Class Name Class C Shares
Trading Symbol FKCCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class C Shares of the Nuveen Kentucky Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class C Shares
  $202    1.96%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 202
Expense Ratio, Percent 1.96% [5]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Kentucky Municipal Bond Fund returned 6.44% for Class C Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund underperformed the S&P Municipal Bond Kentucky Index, which returned 6.71%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds and an underweight to bonds with durations between two and six years.
 
Credit quality positioning, especially an overweight to non-rated bonds.
 
An underweight to the industrial revenue development bond sector.
 
Top detractors from relative performance
 
Sector positioning, especially an overweight to health care bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class C Shares at NAV (excluding maximum sales charge)
       6.44        (0.61 )%         0.98
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Kentucky Index
       6.71        1.50        2.51
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 220,120,918
Holdings Count | Holding 98
Advisory Fees Paid, Amount $ 1,072,584
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 220,120,918  
Total number of portfolio holdings
     98  
Portfolio turnover (%)
     13%  
Total management fees paid for the year
   $ 1,072,584  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
  (2)
Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Exposure Basis Explanation [Text Block] Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000001671 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Kentucky Municipal Bond Fund
Class Name Class I Shares
Trading Symbol FKYRX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class I Shares of the Nuveen Kentucky Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class I Shares
  $100    0.96%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 100
Expense Ratio, Percent 0.96% [6]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Kentucky Municipal Bond Fund returned 7.50% for Class I Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund outperformed the S&P Municipal Bond Kentucky Index, which returned 6.71%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds and an underweight to bonds with durations between two and six years.
 
Credit quality positioning, especially an overweight to non-rated bonds.
 
An underweight to the industrial revenue development bond sector.
 
Top detractors from relative performance
 
Sector positioning, especially an overweight to health care bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class I Shares at NAV
       7.50        0.39        1.84
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Kentucky Index
       6.71        1.50        2.51
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 220,120,918
Holdings Count | Holding 98
Advisory Fees Paid, Amount $ 1,072,584
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 220,120,918  
Total number of portfolio holdings
     98  
Portfolio turnover (%)
     13%  
Total management fees paid for the year
   $ 1,072,584  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
  (2)
Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Exposure Basis Explanation [Text Block] Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000001675 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Michigan Municipal Bond Fund
Class Name Class I Shares
Trading Symbol NMMIX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class I Shares of the Nuveen Michigan Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class I Shares
  $64    0.62%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 64
Expense Ratio, Percent 0.62% [7]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Michigan Municipal Bond Fund returned 6.92% for Class I Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund outperformed the S&P Municipal Bond Michigan Index, which returned 6.36%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds and an underweight to shorter-duration bonds.
 
Credit quality positioning, especially an overweight to non-rated bonds.
 
An overweight to the dedicated-tax bond sector.
 
Top detractors from relative performance
 
Sector allocation, especially an overweight to utility bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class I Shares at NAV
       6.92        0.07        1.69
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Michigan Index
       6.36        1.12        2.47
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 217,545,018
Holdings Count | Holding 120
Advisory Fees Paid, Amount $ 977,391
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 217,545,018  
Total number of portfolio holdings
     120  
Portfolio turnover (%)
     19%  
Total management fees paid for the year
   $ 977,391  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000137707 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Michigan Municipal Bond Fund
Class Name Class C Shares
Trading Symbol FAFNX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class C Shares of the Nuveen Michigan Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class C Shares
  $167    1.62%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 167
Expense Ratio, Percent 1.62% [8]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Michigan Municipal Bond Fund returned 5.87% for Class C Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund underperformed the S&P Municipal Bond Michigan Index, which returned 6.36%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds and an underweight to shorter-duration bonds.
 
Credit quality positioning, especially an overweight to non-rated bonds.
 
An overweight to the dedicated-tax bond sector.
 
Top detractors from relative performance
 
Sector allocation, especially an overweight to utility bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class C Shares at NAV (excluding maximum sales charge)
       5.87        (0.92 )%         0.83
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Michigan Index
       6.36        1.12        2.47
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 217,545,018
Holdings Count | Holding 120
Advisory Fees Paid, Amount $ 977,391
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 217,545,018  
Total number of portfolio holdings
     120  
Portfolio turnover (%)
     19%  
Total management fees paid for the year
   $ 977,391  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000001672 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Michigan Municipal Bond Fund
Class Name Class A Shares
Trading Symbol FMITX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class A Shares of the Nuveen Michigan Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class A Shares
  $85    0.82%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 85
Expense Ratio, Percent 0.82% [9]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Michigan Municipal Bond Fund returned 6.71% for Class A Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund outperformed the S&P Municipal Bond Michigan Index, which returned 6.36%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds and an underweight to shorter-duration bonds.
 
Credit quality positioning, especially an overweight to non-rated bonds.
 
An overweight to the dedicated-tax bond sector.
 
Top detractors from relative performance
 
Sector allocation, especially an overweight to utility bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class A Shares at NAV (excluding maximum sales charge)
       6.71        (0.13 )%         1.48
       
Class A Shares at maximum sales charge (Offering Price)
       2.19        (0.98 )%         1.05
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Michigan Index
       6.36        1.12        2.47
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 217,545,018
Holdings Count | Holding 120
Advisory Fees Paid, Amount $ 977,391
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 217,545,018  
Total number of portfolio holdings
     120  
Portfolio turnover (%)
     19%  
Total management fees paid for the year
   $ 977,391  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block] For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000001676 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Missouri Municipal Bond Fund
Class Name Class A Shares
Trading Symbol FMOTX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class A Shares of the Nuveen Missouri Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class A Shares
  $80    0.77%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 80
Expense Ratio, Percent 0.77% [10]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Missouri Municipal Bond Fund returned 6.90% for Class A Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund underperformed the S&P Municipal Bond Missouri Index, which returned 7.30%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to bonds with durations of 10 years and longer and an underweight to bonds with durations of six years and shorter.
 
Top detractors from relative performance
 
Security selection.
 
Shorter-duration health care bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class A Shares at NAV (excluding maximum sales charge)
       6.90        0.79        2.08
       
Class A Shares at maximum sales charge (Offering Price)
       2.45        (0.07 )%         1.64
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Missouri Index
       7.30        1.37        2.43
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 504,501,374
Holdings Count | Holding 251
Advisory Fees Paid, Amount $ 2,457,683
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 504,501,374  
Total number of portfolio holdings
     251  
Portfolio turnover (%)
     7%  
Total management fees paid for the year
   $ 2,457,683  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000137708 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Missouri Municipal Bond Fund
Class Name Class C Shares
Trading Symbol FAFPX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class C Shares of the Nuveen Missouri Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class C Shares
  $162    1.57%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 162
Expense Ratio, Percent 1.57% [11]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Missouri Municipal Bond Fund returned 6.06% for Class C Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund underperformed the S&P Municipal Bond Missouri Index, which returned 7.30%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to bonds with durations of 10 years and longer and an underweight to bonds with durations of six years and shorter.
 
Top detractors from relative performance
 
Security selection.
 
Shorter-duration health care bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class C Shares at NAV (excluding maximum sales charge)
       6.06        (0.02 )%         1.43
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Missouri Index
       7.30        1.37        2.43
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 504,501,374
Holdings Count | Holding 251
Advisory Fees Paid, Amount $ 2,457,683
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 504,501,374  
Total number of portfolio holdings
     251  
Portfolio turnover (%)
     7%  
Total management fees paid for the year
   $ 2,457,683  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000001679 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Missouri Municipal Bond Fund
Class Name Class I Shares
Trading Symbol FMMRX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class I Shares of the Nuveen Missouri Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class I Shares
  $59    0.57%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 59
Expense Ratio, Percent 0.57% [12]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Missouri Municipal Bond Fund returned 7.21% for Class I Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund performed in line with the S&P Municipal Bond Missouri Index, which returned 7.30%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to bonds with durations of 10 years and longer and an underweight to bonds with durations of six years and shorter.
 
Top detractors from relative performance
 
Security selection.
 
Shorter-duration health care bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class I Shares at NAV
       7.21        1.00        2.29
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Missouri Index
       7.30        1.37        2.43
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 504,501,374
Holdings Count | Holding 251
Advisory Fees Paid, Amount $ 2,457,683
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 504,501,374  
Total number of portfolio holdings
     251  
Portfolio turnover (%)
     7%  
Total management fees paid for the year
   $ 2,457,683  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000001683 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Ohio Municipal Bond Fund
Class Name Class I Shares
Trading Symbol NXOHX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class I Shares of the Nuveen Ohio Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class I Shares
  $58    0.56%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 58
Expense Ratio, Percent 0.56% [13]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Ohio Municipal Bond Fund returned 6.50% for Class I Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund outperformed the S&P Municipal Bond Ohio Index, which returned 5.96%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds and an underweight to shorter-duration bonds.
 
Credit quality positioning, especially an overweight to non-rated bonds.
 
Sector positioning, especially an overweight to dedicated-tax bonds.
 
Top detractors from relative performance
 
An underweight to the housing bond sector.
 
Security selection.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class I Shares at NAV
       6.50        0.67        1.94
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Ohio Index
       5.96        0.90        2.46
       
Lipper Ohio Municipal Debt Funds Classification Average
       6.75        0.45        1.70
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 426,973,140
Holdings Count | Holding 196
Advisory Fees Paid, Amount $ 2,181,795
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 426,973,140  
Total number of portfolio holdings
     196  
Portfolio turnover (%)
     19%  
Total management fees paid for the year
   $ 2,181,795  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000137709 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Ohio Municipal Bond Fund
Class Name Class C Shares
Trading Symbol FAFMX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class C Shares of the Nuveen Ohio Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class C Shares
  $160    1.56%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 160
Expense Ratio, Percent 1.56% [14]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Ohio Municipal Bond Fund returned 5.53% for Class C Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund underperformed the S&P Municipal Bond Ohio Index, which returned 5.96%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds and an underweight to shorter-duration bonds.
 
Credit quality positioning, especially an overweight to non-rated bonds.
 
Sector positioning, especially an overweight to dedicated-tax bonds.
 
Top detractors from relative performance
 
An underweight to the housing bond sector.
 
Security selection.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class C Shares at NAV (excluding maximum sales charge)
       5.53        (0.34 )%         1.08
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Ohio Index
       5.96        0.90        2.46
       
Lipper Ohio Municipal Debt Funds Classification Average
       6.75        0.45        1.70
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 426,973,140
Holdings Count | Holding 196
Advisory Fees Paid, Amount $ 2,181,795
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 426,973,140  
Total number of portfolio holdings
     196  
Portfolio turnover (%)
     19%  
Total management fees paid for the year
   $ 2,181,795  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000001680 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Ohio Municipal Bond Fund
Class Name Class A Shares
Trading Symbol FOHTX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class A Shares of the Nuveen Ohio Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class A Shares
  $78    0.76%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 78
Expense Ratio, Percent 0.76% [15]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Ohio Municipal Bond Fund returned 6.28% for Class A Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund outperformed the S&P Municipal Bond Ohio Index, which returned 5.96%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds and an underweight to shorter-duration bonds.
 
Credit quality positioning, especially an overweight to non-rated bonds.
 
Sector positioning, especially an overweight to dedicated-tax bonds.
 
Top detractors from relative performance
 
An underweight to the housing bond sector.
 
Security selection.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class A Shares at NAV (excluding maximum sales charge)
       6.28        0.47        1.74
       
Class A Shares at maximum sales charge (Offering Price)
       1.80        (0.38 )%         1.31
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Ohio Index
       5.96        0.90        2.46
       
Lipper Ohio Municipal Debt Funds Classification Average
       6.75        0.45        1.70
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 426,973,140
Holdings Count | Holding 196
Advisory Fees Paid, Amount $ 2,181,795
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 426,973,140  
Total number of portfolio holdings
     196  
Portfolio turnover (%)
     19%  
Total management fees paid for the year
   $ 2,181,795  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000001684 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Wisconsin Municipal Bond Fund
Class Name Class A Shares
Trading Symbol FWIAX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class A Shares of the Nuveen Wisconsin Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class A Shares
  $114    1.10%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 114
Expense Ratio, Percent 1.10% [16]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Wisconsin Municipal Bond Fund returned 7.98% for Class A Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund outperformed the S&P Municipal Bond Wisconsin Index, which returned 6.74%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds.
 
Credit-quality positioning, especially an overweight to BBB-rated bonds.
 
Sector positioning, especially an overweight to appropriation, health care and housing bonds and an underweight to state general obligation bonds.
 
Security selection, especially among non-rated and out-of-state bonds.
 
Top detractors from relative performance
 
Overweights to dedicated-tax and utility bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class A Shares at NAV (excluding maximum sales charge)
       7.98        0.98        2.08
       
Class A Shares at maximum sales charge (Offering Price)
       3.49        0.11        1.65
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Wisconsin Index
       6.74        1.45        2.42
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 102,921,015
Holdings Count | Holding 91
Advisory Fees Paid, Amount $ 413,794
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 102,921,015  
Total number of portfolio holdings
     91  
Portfolio turnover (%)
     8%  
Total management fees paid for the year
   $ 413,794  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
Affiliated investment.
  (2)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
  (3)
Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Exposure Basis Explanation [Text Block] Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000137710 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Wisconsin Municipal Bond Fund
Class Name Class C Shares
Trading Symbol FWCCX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class C Shares of the Nuveen Wisconsin Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class C Shares
  $197    1.90%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 197
Expense Ratio, Percent 1.90% [17]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Wisconsin Municipal Bond Fund returned 7.12% for Class C Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund outperformed the S&P Municipal Bond Wisconsin Index, which returned 6.74%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds.
 
Credit-quality positioning, especially an overweight to BBB-rated bonds.
 
Sector positioning, especially an overweight to appropriation, health care and housing bonds and an underweight to state general obligation bonds.
 
Security selection, especially among non-rated and out-of-state bonds.
 
Top detractors from relative performance
 
Overweights to dedicated-tax and utility bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class C Shares at NAV (excluding maximum sales charge)
       7.12        0.17        1.44
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Wisconsin Index
       6.74        1.45        2.42
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 102,921,015
Holdings Count | Holding 91
Advisory Fees Paid, Amount $ 413,794
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 102,921,015  
Total number of portfolio holdings
     91  
Portfolio turnover (%)
     8%  
Total management fees paid for the year
   $ 413,794  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
Affiliated investment.
  (2)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
  (3)
Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Exposure Basis Explanation [Text Block] Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
C000001687 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Wisconsin Municipal Bond Fund
Class Name Class I Shares
Trading Symbol FWIRX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Class I Shares of the Nuveen Wisconsin Municipal Bond Fund for the period of June 1, 2025 to May 31, 2026.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information at https://www.nuveen.com/en-us/mutual-funds/prospectuses. You can also request this information by contacting us at (800) 257-8787.
Material Fund Change Notice [Text Block]
This report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number (800) 257-8787
Additional Information Website https://www.nuveen.com/en-us/mutual-funds/prospectuses
Expenses [Text Block]
What were the Fund costs for the last year? (based on a hypothetical $10,000 investment)
   
    Cost of a $10,000 investment    Costs paid as a percentage of
$10,000 investment*
     
Class I Shares
  $94    0.90%
  *  
Annualized for period less than one year.
 
Expenses Paid, Amount $ 94
Expense Ratio, Percent 0.90% [18]
Factors Affecting Performance [Text Block]
How did the Fund perform last year? What affected the Fund’s performance?
Performance Highlights
 
The Nuveen Wisconsin Municipal Bond Fund returned 8.17% for Class I Shares at net asset value (NAV) for the 12 months ended May 31, 2026. The Fund outperformed the S&P Municipal Bond Wisconsin Index, which returned 6.74%.
 
Top contributors to relative performance
 
Duration positioning, especially an overweight to longer-duration bonds.
 
Credit-quality positioning, especially an overweight to BBB-rated bonds.
 
Sector positioning, especially an overweight to appropriation, health care and housing bonds and an underweight to state general obligation bonds.
 
Security selection, especially among non-rated and out-of-state bonds.
 
Top detractors from relative performance
 
Overweights to dedicated-tax and utility bonds.
Performance Past Does Not Indicate Future [Text] Performance data shown represents past performance and does not predict or guarantee future results.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
Average Annual Total Returns
     
       1-Year        5-Year        10-Year  
       
Class I Shares at NAV
       8.17        1.16        2.27
       
S&P Municipal Bond Index
       6.57        1.14        2.30
       
S&P Municipal Bond Wisconsin Index
       6.74        1.45        2.42
       
Lipper Other States Municipal Debt Funds Classification Average
       7.08        0.43        1.54
No Deduction of Taxes [Text Block] The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or redemption of Fund Shares.
Updated Performance Information Location [Text Block] For most recent month-end performance, go to https://www.nuveen.com/en-us/mutual-funds/prospectuses or call (800) 257‑8787.
Net Assets $ 102,921,015
Holdings Count | Holding 91
Advisory Fees Paid, Amount $ 413,794
Investment Company Portfolio Turnover 8.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of May 31, 2026)
Fund net assets
   $ 102,921,015  
Total number of portfolio holdings
     91  
Portfolio turnover (%)
     8%  
Total management fees paid for the year
   $ 413,794  
Holdings [Text Block]
LOGO
 
LOGO
  (1)
Affiliated investment.
  (2)
The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
  (3)
Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Exposure Basis Explanation [Text Block] Total investments include the Fund’s assets attributable to financial leverage. For these purposes, financial leverage includes the Fund’s investments in the residual interest certificates (also called inverse floating rate securities) in tender option bond (TOB) trusts, including the portion of assets held by a TOB trust that has been effectively financed by the trust’s issuance of floating rate securities.
Credit Ratings Selection [Text Block] The ratings disclosed are the highest rating given by one of the following national rating agencies: Standard & Poor’s (S&P), Moody’s Investors Service, Inc. (Moody’s) or Fitch, Inc (Fitch). This treatment of split-rated securities may differ from that used for other purposes, such as for Fund investment policies. Credit ratings are subject to change. AAA, AA, A, and BBB are investment grade ratings; BB, B, CCC, CC, C and D are below-investment grade ratings. Holdings designated N/R are not rated by these national ratings agencies.
Material Fund Change [Text Block]
How has the Fund changed?
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Summary of Change Legend [Text Block]
For more complete information, you may review the Fund’s next prospectus, which is expected to be available by September 30, 2026 at https://www.nuveen.com/en-us/mutual-funds/prospectuses or upon request at (800) 257-8787.
Updated Prospectus Phone Number (800) 257-8787
Updated Prospectus Web Address https://www.nuveen.com/en-us/mutual-funds/prospectuses
[1] Annualized for period less than one year.
[2] Annualized for period less than one year.
[3] Annualized for period less than one year.
[4] Annualized for period less than one year.
[5] Annualized for period less than one year.
[6] Annualized for period less than one year.
[7] Annualized for period less than one year.
[8] Annualized for period less than one year.
[9] Annualized for period less than one year.
[10] Annualized for period less than one year.
[11] Annualized for period less than one year.
[12] Annualized for period less than one year.
[13] Annualized for period less than one year.
[14] Annualized for period less than one year.
[15] Annualized for period less than one year.
[16] Annualized for period less than one year.
[17] Annualized for period less than one year.
[18] Annualized for period less than one year.