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Shareholder Report
 6 Months Ended
Jun. 30, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name NUVEEN INVESTMENT FUNDS INC
Entity Central Index Key 0000820892
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
C000015147 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Real Estate Securities Fund
Class Name Class A Shares
Trading Symbol FREAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class A Shares of the Nuveen Real Estate Securities Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information athttps://www.nuveen.com/en‑us/mutual‑funds/prospectuses. You can also request this information by contacting us at (800) 257‑8787.
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 six months? (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
   $59    1.18%
* Annualized for period less than one year.
Expenses Paid, Amount $ 59
Expense Ratio, Percent 1.18% [1]
Net Assets $ 908,145,761
Holdings Count | Holding 67
Investment Company Portfolio Turnover 33.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $908,145,761  
Total number of portfolio holdings
      67  
Portfolio turnover (%)
      33%  
Holdings [Text Block]
  LOGO
C000015149 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Real Estate Securities Fund
Class Name Class C Shares
Trading Symbol FRLCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class C Shares of the Nuveen Real Estate Securities Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information athttps://www.nuveen.com/en‑us/mutual‑funds/prospectuses. You can also request this information by contacting us at (800) 257‑8787.
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 six months? (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
   $96    1.93%
* Annualized for period less than one year.
Expenses Paid, Amount $ 96
Expense Ratio, Percent 1.93% [2]
Net Assets $ 908,145,761
Holdings Count | Holding 67
Investment Company Portfolio Turnover 33.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $908,145,761  
Total number of portfolio holdings
      67  
Portfolio turnover (%)
      33%  
Holdings [Text Block]
  LOGO
C000126484 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Real Estate Securities Fund
Class Name Class R6 Shares
Trading Symbol FREGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class R6 Shares of the Nuveen Real Estate Securities Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information athttps://www.nuveen.com/en‑us/mutual‑funds/prospectuses. You can also request this information by contacting us at (800) 257‑8787.
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 six months? (based on a hypothetical $10,000 investment)
   
   
Cost of a 
$10,000 investment 
   Costs paid as a percentage of
$10,000 investment*
     
Class R6 Shares
   $36    0.71%
* Annualized for period less than one year.
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.71% [3]
Net Assets $ 908,145,761
Holdings Count | Holding 67
Investment Company Portfolio Turnover 33.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $908,145,761  
Total number of portfolio holdings
      67  
Portfolio turnover (%)
      33%  
Holdings [Text Block]
  LOGO
C000015151 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Real Estate Securities Fund
Class Name Class I Shares
Trading Symbol FARCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class I Shares of the Nuveen Real Estate Securities Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information athttps://www.nuveen.com/en‑us/mutual‑funds/prospectuses. You can also request this information by contacting us at (800) 257‑8787.
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 six months? (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
   $47    0.93%
* Annualized for period less than one year.
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.93% [4]
Net Assets $ 908,145,761
Holdings Count | Holding 67
Investment Company Portfolio Turnover 33.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $908,145,761  
Total number of portfolio holdings
      67  
Portfolio turnover (%)
      33%  
Holdings [Text Block]
  LOGO
C000056118 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Global Infrastructure Fund
Class Name Class A Shares
Trading Symbol FGIAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class A Shares of the Nuveen Global Infrastructure Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information athttps://www.nuveen.com/en‑us/mutual‑funds/prospectuses. You can also request this information by contacting us at (800) 257‑8787.
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 six months? (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
   $65    1.21%
* Annualized for period less than one year.
Expenses Paid, Amount $ 65
Expense Ratio, Percent 1.21% [5]
Net Assets $ 481,189,828
Holdings Count | Holding 88
Investment Company Portfolio Turnover 50.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $481,189,828  
Total number of portfolio holdings
      88  
Portfolio turnover (%)
      50%  
Holdings [Text Block]
  LOGO
  LOGO
C000070757 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Global Infrastructure Fund
Class Name Class C Shares
Trading Symbol FGNCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class C Shares of the Nuveen Global Infrastructure Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-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.
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 six months? (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
   $104    1.96%
* Annualized for period less than one year.
Expenses Paid, Amount $ 104
Expense Ratio, Percent 1.96% [6]
Net Assets $ 481,189,828
Holdings Count | Holding 88
Investment Company Portfolio Turnover 50.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $481,189,828  
Total number of portfolio holdings
      88  
Portfolio turnover (%)
      50%  
Holdings [Text Block]
  LOGO
  LOGO
C000171406 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Global Infrastructure Fund
Class Name Class R6 Shares
Trading Symbol FGIWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class R6 Shares of the Nuveen Global Infrastructure Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information athttps://www.nuveen.com/en‑us/mutual‑funds/prospectuses. You can also request this information by contacting us at (800) 257‑8787.
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 six months? (based on a hypothetical $10,000 investment)
   
   
Cost of a 
$10,000 investment 
   Costs paid as a percentage of
$10,000 investment*
     
Class R6 Shares
   $48    0.90%
* Annualized for period less than one year.
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.90% [7]
Net Assets $ 481,189,828
Holdings Count | Holding 88
Investment Company Portfolio Turnover 50.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $481,189,828  
Total number of portfolio holdings
      88  
Portfolio turnover (%)
      50%  
Holdings [Text Block]
  LOGO
  LOGO
C000056119 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Global Infrastructure Fund
Class Name Class I Shares
Trading Symbol FGIYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class I Shares of the Nuveen Global Infrastructure Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information athttps://www.nuveen.com/en‑us/mutual‑funds/prospectuses. You can also request this information by contacting us at (800) 257‑8787.
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 six months? (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
   $51    0.96%
* Annualized for period less than one year.
Expenses Paid, Amount $ 51
Expense Ratio, Percent 0.96% [8]
Net Assets $ 481,189,828
Holdings Count | Holding 88
Investment Company Portfolio Turnover 50.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $481,189,828  
Total number of portfolio holdings
      88  
Portfolio turnover (%)
      50%  
Holdings [Text Block]
  LOGO
  LOGO
C000104365 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Real Asset Income Fund
Class Name Class A Shares
Trading Symbol NRIAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class A Shares of the Nuveen Real Asset Income Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information athttps://www.nuveen.com/en‑us/mutual‑funds/prospectuses. You can also request this information by contacting us at (800) 257‑8787.
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 six months? (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
   $60    1.16%
* Annualized for period less than one year.
Expenses Paid, Amount $ 60
Expense Ratio, Percent 1.16% [9]
Net Assets $ 1,114,682,373
Holdings Count | Holding 458
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $1,114,682,373  
Total number of portfolio holdings
      458  
Portfolio turnover (%)
      36%  
Holdings [Text Block]
  LOGO
  LOGO
C000104366 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Real Asset Income Fund
Class Name Class C Shares
Trading Symbol NRICX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class C Shares of the Nuveen Real Asset Income Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information athttps://www.nuveen.com/en‑us/mutual‑funds/prospectuses. You can also request this information by contacting us at (800) 257‑8787.
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 six months? (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
   $99    1.91%
* Annualized for period less than one year.
Expenses Paid, Amount $ 99
Expense Ratio, Percent 1.91% [10]
Net Assets $ 1,114,682,373
Holdings Count | Holding 458
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $1,114,682,373  
Total number of portfolio holdings
      458  
Portfolio turnover (%)
      36%  
Holdings [Text Block]
  LOGO
  LOGO
C000171407 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Real Asset Income Fund
Class Name Class R6 Shares
Trading Symbol NRIFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class R6 Shares of the Nuveen Real Asset Income Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information athttps://www.nuveen.com/en‑us/mutual‑funds/prospectuses. You can also request this information by contacting us at (800) 257‑8787.
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 six months? (based on a hypothetical $10,000 investment)
   
   
Cost of a 
$10,000 investment 
   Costs paid as a percentage of
$10,000 investment*
     
Class R6 Shares
   $42    0.81%
* Annualized for period less than one year.
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.81% [11]
Net Assets $ 1,114,682,373
Holdings Count | Holding 458
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $1,114,682,373  
Total number of portfolio holdings
      458  
Portfolio turnover (%)
      36%  
Holdings [Text Block]
  LOGO
  LOGO
C000104368 [Member]  
Shareholder Report [Line Items]  
Fund Name Nuveen Real Asset Income Fund
Class Name Class I Shares
Trading Symbol NRIIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the Class I Shares of the Nuveen Real Asset Income Fund for the period of January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information athttps://www.nuveen.com/en‑us/mutual‑funds/prospectuses. You can also request this information by contacting us at (800) 257‑8787.
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 six months? (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
   $47    0.91%
* Annualized for period less than one year.
Expenses Paid, Amount $ 47
Expense Ratio, Percent 0.91% [12]
Net Assets $ 1,114,682,373
Holdings Count | Holding 458
Investment Company Portfolio Turnover 36.00%
Additional Fund Statistics [Text Block]
Fund Statistics (as of June 30, 2025)
Fund net assets
      $1,114,682,373  
Total number of portfolio holdings
      458  
Portfolio turnover (%)
      36%  
Holdings [Text Block]
  LOGO
  LOGO
[1] Annualized for period less than one year.
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[3] Annualized for period less than one year.
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[12] Annualized for period less than one year.