v3.26.1
S000033768 [Member] Expense Example - Nuveen Real Asset Income Fund
Dec. 31, 2025
USD ($)
Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 686
Expense Example, with Redemption, 3 Years 923
Expense Example, with Redemption, 5 Years 1,180
Expense Example, with Redemption, 10 Years 1,912
Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 194
Expense Example, with Redemption, 3 Years 601
Expense Example, with Redemption, 5 Years 1,035
Expense Example, with Redemption, 10 Years 2,241
Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 93
Expense Example, with Redemption, 3 Years 291
Expense Example, with Redemption, 5 Years 507
Expense Example, with Redemption, 10 Years 1,129
Class R6  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 83
Expense Example, with Redemption, 3 Years 259
Expense Example, with Redemption, 5 Years 453
Expense Example, with Redemption, 10 Years $ 1,011