3.20.1 html 237 163 1 true 136 0 false 2 false false R1.htm 000000 - Document - Document and Entity Information {Elements} Sheet http://www.voyainvestments.com/role/DocumentDocumentandEntityInformationElements Document and Entity Information 1 false true R2.htm 000011 - Document - Risk/Return Summary {Unlabeled} - Voya Balanced Income Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaBalancedIncomePortfolio Risk/Return Summary- Voya Balanced Income Portfolio 2 false false R8.htm 000019 - Disclosure - Risk/Return Detail Data {Elements} - Voya Balanced Income Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaBalancedIncomePortfolio Risk/Return Detail Data- Voya Balanced Income Portfolio 3 false true R9.htm 000021 - Document - Risk/Return Summary {Unlabeled} - Voya Government Liquid Assets Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaGovernmentLiquidAssetsPortfolio Risk/Return Summary- Voya Government Liquid Assets Portfolio 4 false false R15.htm 000029 - Disclosure - Risk/Return Detail Data {Elements} - Voya Government Liquid Assets Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaGovernmentLiquidAssetsPortfolio Risk/Return Detail Data- Voya Government Liquid Assets Portfolio 5 false true R16.htm 000031 - Document - Risk/Return Summary {Unlabeled} - Voya High Yield Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaHighYieldPortfolio Risk/Return Summary- Voya High Yield Portfolio 6 false false R22.htm 000039 - Disclosure - Risk/Return Detail Data {Elements} - Voya High Yield Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaHighYieldPortfolio Risk/Return Detail Data- Voya High Yield Portfolio 7 false true R23.htm 000041 - Document - Risk/Return Summary {Unlabeled} - Voya Large Cap Growth Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaLargeCapGrowthPortfolio Risk/Return Summary- Voya Large Cap Growth Portfolio 8 false false R29.htm 000049 - Disclosure - Risk/Return Detail Data {Elements} - Voya Large Cap Growth Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaLargeCapGrowthPortfolio Risk/Return Detail Data- Voya Large Cap Growth Portfolio 9 false true R30.htm 000051 - Document - Risk/Return Summary {Unlabeled} - Voya Large Cap Value Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaLargeCapValuePortfolio Risk/Return Summary- Voya Large Cap Value Portfolio 10 false false R36.htm 000059 - Disclosure - Risk/Return Detail Data {Elements} - Voya Large Cap Value Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaLargeCapValuePortfolio Risk/Return Detail Data- Voya Large Cap Value Portfolio 11 false true R37.htm 000061 - Document - Risk/Return Summary {Unlabeled} - Voya Limited Maturity Bond Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaLimitedMaturityBondPortfolio Risk/Return Summary- Voya Limited Maturity Bond Portfolio 12 false false R43.htm 000069 - Disclosure - Risk/Return Detail Data {Elements} - Voya Limited Maturity Bond Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaLimitedMaturityBondPortfolio Risk/Return Detail Data- Voya Limited Maturity Bond Portfolio 13 false true R44.htm 000071 - Document - Risk/Return Summary {Unlabeled} - Voya U.S. Stock Index Portfolio (Class ADV, I, S, S2 Shares) Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaUSStockIndexPortfolioClassADVISSShares0000712 Risk/Return Summary- Voya U.S. Stock Index Portfolio (Class ADV, I, S, S2 Shares) 14 false false R50.htm 000079 - Disclosure - Risk/Return Detail Data {Elements} - Voya U.S. Stock Index Portfolio (Class ADV, I, S, S2 Shares) Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaUSStockIndexPortfolioClassADVISSShares0000792 Risk/Return Detail Data- Voya U.S. Stock Index Portfolio (Class ADV, I, S, S2 Shares) 15 false true R51.htm 000081 - Document - Risk/Return Summary {Unlabeled} - VY(R) BlackRock Inflation Protected Bond Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVY(R)BlackRockInflationProtectedBondPortfolio Risk/Return Summary- VY(R) BlackRock Inflation Protected Bond Portfolio 16 false false R57.htm 000089 - Disclosure - Risk/Return Detail Data {Elements} - VY(R) BlackRock Inflation Protected Bond Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVY(R)BlackRockInflationProtectedBondPortfolio Risk/Return Detail Data- VY(R) BlackRock Inflation Protected Bond Portfolio 17 false true R58.htm 000091 - Document - Risk/Return Summary {Unlabeled} - VY(R) Clarion Global Real Estate Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVY(R)ClarionGlobalRealEstatePortfolio Risk/Return Summary- VY(R) Clarion Global Real Estate Portfolio 18 false false R64.htm 000099 - Disclosure - Risk/Return Detail Data {Elements} - VY(R) Clarion Global Real Estate Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVY(R)ClarionGlobalRealEstatePortfolio Risk/Return Detail Data- VY(R) Clarion Global Real Estate Portfolio 19 false true R65.htm 000101 - Document - Risk/Return Summary {Unlabeled} - VY(R) Clarion Real Estate Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVY(R)ClarionRealEstatePortfolio Risk/Return Summary- VY(R) Clarion Real Estate Portfolio 20 false false R71.htm 000109 - Disclosure - Risk/Return Detail Data {Elements} - VY(R) Clarion Real Estate Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVY(R)ClarionRealEstatePortfolio Risk/Return Detail Data- VY(R) Clarion Real Estate Portfolio 21 false true R72.htm 000111 - Document - Risk/Return Summary {Unlabeled} - VY(R) Invesco Growth and Income Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVY(R)InvescoGrowthandIncomePortfolio Risk/Return Summary- VY(R) Invesco Growth and Income Portfolio 22 false false R78.htm 000119 - Disclosure - Risk/Return Detail Data {Elements} - VY(R) Invesco Growth and Income Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVY(R)InvescoGrowthandIncomePortfolio Risk/Return Detail Data- VY(R) Invesco Growth and Income Portfolio 23 false true R79.htm 000121 - Document - Risk/Return Summary {Unlabeled} - VY(R) JPMorgan Emerging Markets Equity Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVY(R)JPMorganEmergingMarketsEquityPortfolio Risk/Return Summary- VY(R) JPMorgan Emerging Markets Equity Portfolio 24 false false R85.htm 000129 - Disclosure - Risk/Return Detail Data {Elements} - VY(R) JPMorgan Emerging Markets Equity Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVY(R)JPMorganEmergingMarketsEquityPortfolio Risk/Return Detail Data- VY(R) JPMorgan Emerging Markets Equity Portfolio 25 false true R86.htm 000131 - Document - Risk/Return Summary {Unlabeled} - VY(R) JPMorgan Small Cap Core Equity Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVY(R)JPMorganSmallCapCoreEquityPortfolio Risk/Return Summary- VY(R) JPMorgan Small Cap Core Equity Portfolio 26 false false R92.htm 000139 - Disclosure - Risk/Return Detail Data {Elements} - VY(R) JPMorgan Small Cap Core Equity Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVY(R)JPMorganSmallCapCoreEquityPortfolio Risk/Return Detail Data- VY(R) JPMorgan Small Cap Core Equity Portfolio 27 false true R93.htm 000141 - Document - Risk/Return Summary {Unlabeled} - VY(R) Morgan Stanley Global Franchise Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVY(R)MorganStanleyGlobalFranchisePortfolio Risk/Return Summary- VY(R) Morgan Stanley Global Franchise Portfolio 28 false false R99.htm 000149 - Disclosure - Risk/Return Detail Data {Elements} - VY(R) Morgan Stanley Global Franchise Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVY(R)MorganStanleyGlobalFranchisePortfolio Risk/Return Detail Data- VY(R) Morgan Stanley Global Franchise Portfolio 29 false true R100.htm 000151 - Document - Risk/Return Summary {Unlabeled} - VY(R) T. Rowe Price Capital Appreciation Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVY(R)T.RowePriceCapitalAppreciationPortfolio Risk/Return Summary- VY(R) T. Rowe Price Capital Appreciation Portfolio 30 false false R106.htm 000159 - Disclosure - Risk/Return Detail Data {Elements} - VY(R) T. Rowe Price Capital Appreciation Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVY(R)T.RowePriceCapitalAppreciationPortfolio Risk/Return Detail Data- VY(R) T. Rowe Price Capital Appreciation Portfolio 31 false true R107.htm 000161 - Document - Risk/Return Summary {Unlabeled} - VY(R) T. Rowe Price Equity Income Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVY(R)T.RowePriceEquityIncomePortfolio Risk/Return Summary- VY(R) T. Rowe Price Equity Income Portfolio 32 false false R113.htm 000169 - Disclosure - Risk/Return Detail Data {Elements} - VY(R) T. Rowe Price Equity Income Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVY(R)T.RowePriceEquityIncomePortfolio Risk/Return Detail Data- VY(R) T. Rowe Price Equity Income Portfolio 33 false true R114.htm 000171 - Document - Risk/Return Summary {Unlabeled} - VY(R) T. Rowe Price International Stock Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVY(R)T.RowePriceInternationalStockPortfolio Risk/Return Summary- VY(R) T. Rowe Price International Stock Portfolio 34 false false R120.htm 000179 - Disclosure - Risk/Return Detail Data {Elements} - VY(R) T. Rowe Price International Stock Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVY(R)T.RowePriceInternationalStockPortfolio Risk/Return Detail Data- VY(R) T. Rowe Price International Stock Portfolio 35 false true R121.htm 000181 - Document - Risk/Return Summary {Unlabeled} - Voya U.S. Stock Index Portfolio (Class P2 Shares) Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaUSStockIndexPortfolioClassPShares0001812 Risk/Return Summary- Voya U.S. Stock Index Portfolio (Class P2 Shares) 36 false false R127.htm 000189 - Disclosure - Risk/Return Detail Data {Elements} - Voya U.S. Stock Index Portfolio (Class P2 Shares) Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaUSStockIndexPortfolioClassPShares0001892 Risk/Return Detail Data- Voya U.S. Stock Index Portfolio (Class P2 Shares) 37 false true R128.htm 000191 - Document - Risk/Return Summary {Unlabeled} - Voya Global Perspectives(R) Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaGlobalPerspectives(R)Portfolio Risk/Return Summary- Voya Global Perspectives(R) Portfolio 38 false false R134.htm 000199 - Disclosure - Risk/Return Detail Data {Elements} - Voya Global Perspectives(R) Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaGlobalPerspectives(R)Portfolio Risk/Return Detail Data- Voya Global Perspectives(R) Portfolio 39 false true R135.htm 000201 - Document - Risk/Return Summary {Unlabeled} - Voya Retirement Conservative Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaRetirementConservativePortfolio Risk/Return Summary- Voya Retirement Conservative Portfolio 40 false false R141.htm 000209 - Disclosure - Risk/Return Detail Data {Elements} - Voya Retirement Conservative Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaRetirementConservativePortfolio Risk/Return Detail Data- Voya Retirement Conservative Portfolio 41 false true R142.htm 000211 - Document - Risk/Return Summary {Unlabeled} - Voya Retirement Growth Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaRetirementGrowthPortfolio Risk/Return Summary- Voya Retirement Growth Portfolio 42 false false R148.htm 000219 - Disclosure - Risk/Return Detail Data {Elements} - Voya Retirement Growth Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaRetirementGrowthPortfolio Risk/Return Detail Data- Voya Retirement Growth Portfolio 43 false true R149.htm 000221 - Document - Risk/Return Summary {Unlabeled} - Voya Retirement Moderate Growth Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaRetirementModerateGrowthPortfolio Risk/Return Summary- Voya Retirement Moderate Growth Portfolio 44 false false R155.htm 000229 - Disclosure - Risk/Return Detail Data {Elements} - Voya Retirement Moderate Growth Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaRetirementModerateGrowthPortfolio Risk/Return Detail Data- Voya Retirement Moderate Growth Portfolio 45 false true R156.htm 000231 - Document - Risk/Return Summary {Unlabeled} - Voya Retirement Moderate Portfolio Sheet http://www.voyainvestments.com/role/DocumentRiskReturnSummaryUnlabeledVoyaRetirementModeratePortfolio Risk/Return Summary- Voya Retirement Moderate Portfolio 46 false false R162.htm 000239 - Disclosure - Risk/Return Detail Data {Elements} - Voya Retirement Moderate Portfolio Sheet http://www.voyainvestments.com/role/DisclosureRiskReturnDetailDataElementsVoyaRetirementModeratePortfolio Risk/Return Detail Data- Voya Retirement Moderate Portfolio 47 false false R163.htm 040000 - Disclosure - Risk/Return Detail Data {Elements} Sheet http://xbrl.sec.gov/rr/role/RiskReturnDetailData Risk/Return Detail Data 48 false false All Reports Book All Reports vit-20200423.xml vit-20200423.xsd vit-20200423_cal.xml vit-20200423_def.xml vit-20200423_lab.xml vit-20200423_pre.xml BarChart1.png BarChart2.png BarChart3.png BarChart4.png BarChart5.png BarChart6.png BarChart7.png BarChart8.png BarChart9.png BarChart10.png BarChart11.png BarChart12.png BarChart13.png BarChart14.png BarChart15.png BarChart16.png BarChart17.png BarChart18.png BarChart19.png BarChart20.png BarChart21.png BarChart22.png BarChart23.png http://xbrl.sec.gov/rr/2018-01-31 http://xbrl.sec.gov/dei/2018-01-31 true true