XML 13 R10.htm IDEA: XBRL DOCUMENT v3.10.0.1
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName NUVEEN INVESTMENT FUNDS INC
Prospectus Date rr_ProspectusDate Jun. 20, 2018
Document Creation Date dei_DocumentCreationDate Jun. 20, 2018