v3.25.2
Form N-1A Cover
Mar. 31, 2025
Prospectus [Line Items]  
Document Type 485BPOS
Amendment Flag false
Registrant Name NUVEEN INVESTMENT FUNDS INC
Entity Central Index Key 0000820892
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2025
Prospectus Date Jul. 31, 2025