XML 10 R4.htm IDEA: XBRL DOCUMENT v3.19.1
Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName VANGUARD INDEX FUNDS
Prospectus Date rr_ProspectusDate Apr. 26, 2019
Document Creation Date dei_DocumentCreationDate Apr. 26, 2019