XML 10 R4.htm IDEA: XBRL DOCUMENT v3.19.1
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName RUSSELL INVESTMENT CO
Prospectus Date rr_ProspectusDate Mar. 01, 2019
Document Creation Date dei_DocumentCreationDate Mar. 14, 2019