C000017675S&P 500 Index (USD) (TR)S&P 500 Index (USD) (TR)_417MSCI USA Infrastructure (USD) (TR)MSCI USA Infrastructure (USD) (TR)_417Short-Term InvestmentGasCommunication ServicesIndependent Power and Renewable Electricity ProducersInformation TechnologyTelecommunication ServicesReal EstateEnergyMulti-UtilitiesIndustrialsElectric UtilitiesQuanta Services9424275DT Midstream9424250Talen Energy9424281Entergy9424253Constellation Energy9424244Equinix9424255IDACORP9424261NiSource9424271T-Mobile US9424279Johnson Controls International9424265No Trading Symbol [Flag]AssetsNetInvestmentCompanyPortfolioTurnover