Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Voya VARIABLE INSURANCE TRUST
Prospectus Date	rr_ProspectusDate	Feb. 09, 2015
VY Goldman Sachs Bond Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	VY® Goldman Sachs Bond Portfolio
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Portfolio seeks total return consisting of capital appreciation and income.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	The table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The table does not reflect fees or expenses that are, or may be, imposed under your variable annuity contracts or variable life insurance policies (“Variable Contract”) or a qualified pension or retirement plan (“Qualified Plan”). For more information on these charges, please refer to the documents governing your Variable Contract or consult your plan administrator.
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Portfolio Operating Expenses Expenses you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	May 1, 2017
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Portfolio pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the Expense Example, affect the Portfolio's performance. Since the Portfolio had not commenced operations as of the date of this Prospectus, there is no annual portfolio turnover rate information included.
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	Other Expenses are based on estimated amounts for the current fiscal year.
Expense Example [Heading]	rr_ExpenseExampleHeading	Expense Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Example is intended to help you compare the cost of investing in shares of the Portfolio with the costs of investing in other mutual funds. The Examples do not reflect expenses and charges which are, or may be, imposed under your Variable Contract or Qualified Plan. The Example assumes that you invest $10,000 in the Portfolio for the time periods indicated. The Example also assumes that your investment had a 5% return each year and that the Portfolio's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first two years of the three-year period.
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the Portfolio invests at least 80% of its net assets (plus borrowings for investment purposes) in bonds and other fixed-income securities. The Portfolio will provide 60 days’ prior notice of any change in this investment policy. For the purposes of satisfying the 80% requirement, the Portfolio may also invest in derivative instruments that have the economic characteristics similar to bonds and other fixed-income securities. The other types of fixed-income securities in which the Portfolio may invest include securities issued or guaranteed by the U.S. government, its agencies, instrumentalities or sponsored enterprises (“U.S. Government Securities”), corporate debt securities, collateralized loan obligations, privately issued adjustable-rate and fixed-rate mortgage loans or other mortgage-related securities (“Mortgage-Backed Securities”), asset-backed securities and high-yield non-investment grade securities (i.e., “junk bonds”) (securities rated BB+, Ba1 or below by a nationally recognized statistical rating organization (“NRSRO”) or, if unrated, determined by the sub-adviser (“Sub-Adviser”) to be of comparable credit quality). The Portfolio may purchase or sell Mortgage-Backed Securities on a delayed delivery or forward commitment basis through the “to be announced” (“TBA”) market. With TBA transactions, the particular securities to be delivered are not identified at the trade date but the delivered securities must meet specified terms and standards. The Portfolio may also invest in convertible securities and real estate investment trusts (“REITs”). The Portfolio may also invest in derivatives, including forward foreign currency transactions, futures, options, and swaps involving securities, securities indices and interest rates, which may be denominated in the U.S. dollar or foreign currencies. The Portfolio typically uses derivatives to reduce exposure to other risks, such as interest rate or currency risk, to substitute for taking a position in the underlying asset, and/or to enhance returns in the Portfolio. The Portfolio may invest in obligations of domestic and foreign issuers which are denominated in currencies other than the U.S. dollar. The Portfolio may invest up to 15% of its total assets (not including securities lending collateral and any investment of that collateral) measured at the time of purchase in sovereign and corporate debt securities and other instruments of issuers in emerging market countries (“emerging countries debt”). The Portfolio may also purchase securities of issuers in default. The Portfolio’s investments in non-investment grade securities (i.e., “junk bonds”) will not exceed 25% of its total assets at the time of purchase. Otherwise, the Portfolio invests in fixed-income securities rated at least BBB- or Baa3 at the time of purchase. Securities will either be rated by an NRSRO or, if unrated, determined by the Sub-Adviser to be of comparable credit quality. The Portfolio assigns a security, at the time of purchase, the highest rating by an NRSRO if the security is rated by more than one NRSRO. The Portfolio may invest in other investment companies, including exchange-traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”). The Portfolio’s target duration range under normal interest rate conditions is expected to approximate that of the Barclay’s Capital U.S. Aggregate Bond Index (“Index”), plus or minus 2.5 years, and over the last ten years ended December 31, 2014, the duration of the Index has ranged between 3.71 and 5.65 years. Duration is the most commonly used measure of risk in debt instruments as it incorporates multiple features of the debt instruments (e.g., yield, coupon, maturity, etc.) into one number. Duration is a measure of sensitivity of the price of a debt security to a change in interest rates. Duration is a weighted average of the times that interest payments and the final return of principal are received. The weights are the amounts of the payments discounted by the yield-to-maturity of the debt instrument. Duration is expressed as a number of years. The bigger the duration number, the greater the interest-rate risk or reward for the debt instrument prices. For example, the price of a bond with an average duration of five years would be expected to fall approximately 5% if interest rates rose by 1%. Conversely, the price of a bond with an average duration of five years would be expected to rise approximately 5% if interest rates drop by 1%. The Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others. The Portfolio may lend portfolio securities on a short-term or long-term basis, up to 33 1⁄3% of its total assets.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money on an investment in the Portfolio. Any of the following risks, among others, could affect Portfolio performance or cause the Portfolio to lose money or to underperform market averages of other funds. Call    During periods of falling interest rates, a bond issuer may “call” or repay its high-yielding bond before the bond's maturity date. If forced to invest the unanticipated proceeds at lower interest rates, the Portfolio would experience a decline in income. Convertible Securities    Convertible securities are securities that are convertible into or exercisable for common stocks at a stated price or rate. Convertible securities are subject to the usual risks associated with debt securities, such as interest rate and credit risk. In addition, because convertible securities react to changes in the value of the stocks into which they convert, they are subject to market risk. Credit    Prices of bonds and other debt instruments can fall if the issuer's actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether. Lower quality securities (including securities that have fallen below investment-grade and are classified as “junk bonds”) have greater credit risk and liquidity risk than higher quality (investment-grade) securities, and their issuers' long-term ability to make payments is considered speculative. Prices of lower quality bonds or other debt instruments are also more volatile, are more sensitive to negative news about the economy or the issuer, and have greater liquidity and price volatility risk. Currency    To the extent that the Portfolio invests directly in foreign (non-U.S.) currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those foreign (non-U.S.) currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged. Derivative Instruments    Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Portfolio and reduce its returns. Derivatives may not perform as expected, so the Portfolio may not realize the intended benefits. When used for hedging, the change in value of a derivative may not correlate as expected with the currency, security or other risk being hedged. In addition, given their complexity, derivatives expose the Portfolio to the risk of improper valuation. Foreign Investments/Developing and Emerging Markets    Investing in foreign (non-U.S.) securities may result in the Portfolio experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments. Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issuers in another market, country or region. Foreign investment risks may be greater in developing and emerging markets than in developed markets. High-Yield Securities    Investments rated below investment-grade (or of similar quality if unrated) are known as “high-yield securities” or “junk bonds.” High-yield securities are subject to greater levels of credit and liquidity risks. High-yield securities are considered primarily speculative with respect to the issuer's continuing ability to make principal and interest payments. Interest in Loans    The value and the income streams of interests in loans (including participation interests in lease financings and assignments in secured variable or floating rate loans) will decline if borrowers delay payments or fail to pay altogether. A large rise in interest rates could increase this risk. Although loans are generally fully collateralized when purchased, the collateral may become illiquid or decline in value. Many loans themselves carry liquidity and valuation risks. Interest Rate    With bonds and other fixed rate debt instruments, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the instrument, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk. In the case of inverse securities, the interest rate generally will decrease when the market rate of interest to which the inverse security is indexed increases. As of the date of this Prospectus, interest rates in the United States are at or near historic lows, which may increase the Portfolio's exposure to risks associated with rising interest rates. Rising interest rates could have unpredictable effects on the markets and may expose fixed-income and related markets to heightened volatility. For fixed-income securities, an increase in interest rates may lead to increased redemptions and increased portfolio turnover, which could reduce liquidity for certain Portfolio investments, adversely affect values, and increase a Portfolio’s costs. If dealer capacity in fixed-income markets is insufficient for market conditions, it may further inhibit liquidity and increase volatility in the fixed-income markets. Liquidity    If a security is illiquid, the Portfolio might be unable to sell the security at a time when the Portfolio's manager might wish to sell, and the security could have the effect of decreasing the overall level of the Portfolio's liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Portfolio could realize upon disposition. The Portfolio may make investments that become less liquid in response to market developments or adverse investor perception. The Portfolio could lose money if it cannot sell a security at the time and price that would be most beneficial to the Portfolio. Mortgage- and/or Asset-Backed Securities Defaults on, or low credit quality or liquidity of the underlying assets of the asset-backed (including mortgage-backed) securities held by the Portfolio may impair the value of the securities. There may be limitations on the enforceability of any security interest granted with respect to those underlying assets. These securities also present a higher degree of prepayment and extension risk and interest rate risk than do other types of debt instruments. Other Investment Companies    The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Portfolio may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Portfolio. Prepayment and Extension    Prepayment risk is the risk that principal on mortgages or other loan obligations underlying a security may be repaid prior to the stated maturity date, which may reduce the market value of the security and the anticipated yield-to-maturity. Extension risk is the risk that an issuer will exercise its right to repay principal on an obligation held by the Portfolio later than expected, which may decrease the value of the obligation and prevent the Portfolio from investing expected repayment proceeds in securities paying yields higher than the yields paid by the securities that were expected to be repaid. Real Estate Companies and Real Estate Investment Trusts (“REITs”)    Investing in real estate companies and REITs may subject the Portfolio to risks similar to those associated with the direct ownership of real estate, including losses from casualty or condemnation, changes in local and general economic conditions, supply and demand, interest rates, zoning laws, regulatory limitations on rents, property taxes, and operating expenses in addition to terrorist attacks, war, or other acts that destroy real property. Securities Lending    Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Portfolio will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Portfolio will lose money due to the failure of a borrower to return a borrowed security in a timely manner. U.S. Government Securities and Obligations    U.S. government securities are obligations of, or guaranteed by, the U.S. government, its agencies or government-sponsored enterprises. U.S. government securities are subject to market and interest rate risk, and may be subject to varying degrees of credit risk. When Issued and Delayed Delivery Securities and Forward Commitments    When issued securities, delayed delivery securities and forward commitments involve the risk that the security the Portfolio buys will lose value prior to its delivery. There also is the risk that the security will not be issued or that the other party will not meet its obligation. If this occurs, the Portfolio loses both the investment opportunity for the assets it set aside to pay for the security and any gain in the security's price. An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	You could lose money on an investment in the Portfolio.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE INFORMATION
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	Because the Portfolio had not commenced operations as of the calendar year ended December 31, 2014, there is no annual performance information included.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	Because the Portfolio had not commenced operations as of the calendar year ended December 31, 2014, there is no annual performance information included.
VY Goldman Sachs Bond Portfolio | VY Goldman Sachs Bond Portfolio
Risk/Return:	rr_RiskReturnAbstract
Management Fee	rr_ManagementFeesOverAssets	0.40%
Distribution and/or Shareholder Services (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Administrative Services Fee	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.09%	[1]
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	0.59%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.01%)	[2]
Total Annual Portfolio Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.58%
1 Yr	rr_ExpenseExampleYear01	59
3 Yrs	rr_ExpenseExampleYear03	187
1 Yr	rr_ExpenseExampleNoRedemptionYear01	59
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	187

[1] Other Expenses are based on estimated amounts for the current fiscal year.

[2] The adviser is contractually obligated to limit expenses to 0.58% through May 1, 2017. The limitation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Portfolio's board.