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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName JOHN HANCOCK VARIABLE INSURANCE TRUST
Prospectus Date rr_ProspectusDate Apr. 28, 2025
Mid Value Trust  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <span style="color:#000000;font-family:Arial Narrow;font-size:24pt;">Mid Value Trust</span>
Objective [Heading] rr_ObjectiveHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Investment objective</span>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock To seek long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Fees and expenses</span>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the fund. The fees and expenses do not reflect fees and expenses of any variable insurance or variable annuities contract that may use the fund as its underlying investment option and would be higher if they did.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Annual fund operating expenses (%) </span><span style="font-family:Arial Narrow;font-size:8pt;margin-left:0.0pt;">(expenses that you pay each year as a percentage of the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination <span style="font-family:Arial Narrow;font-size:8pt;">July 31, 2026</span>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Portfolio turnover</span>
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund 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 fund operating expenses or in the example, affect the fund’s performance. During its most recent fiscal year, the fund’s portfolio turnover rate was 50% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 50.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent <span style="font-family:Arial Narrow;font-size:8pt;">“Management fee” has been restated to reflect the contractual management fee schedule effective January 1, 2025.</span>
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees <span style="font-family:Arial Narrow;font-size:8pt;">The “Total annual fund operating expenses” shown may not correlate to the fund’s ratios of expenses to average daily net assets shown in the “Financial highlights” section of the fund’s prospectus, which does not include “Acquired fund fees and expenses.”</span>
Expense Example [Heading] rr_ExpenseExampleHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Expense example</span>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The examples are intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The examples assume that $10,000 is invested in the fund for the periods indicated and then all shares are redeemed at the end of those periods. The examples also assume that the investment has a 5% return each year and that the fund’s operating expenses remain the same. The expense example does not reflect fees and expenses of any variable insurance contract that may use the fund as its underlying investment option and would be higher if they did. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal investment strategies</span>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock Under normal market conditions, the fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in companies with market capitalizations that are within the Russell Midcap Value Index ($296 million to $87 billion as of February 28, 2025). The fund invests in a diversified mix of common stocks of mid-size U.S. companies that are believed to be undervalued by various measures and offer good prospects for capital appreciation. The subadvisor employs a value approach in selecting investments. The subadvisor’s in-house research team seeks to identify companies whose stock prices do not appear to reflect their underlying values. The subadvisor generally looks for companies with one or more of the following characteristics: ●Low stock prices relative to net assets, earnings, cash flow, sales, book value, or private market value; ●Demonstrated or potentially attractive operating margins, profits and/or cash flow; ●Sound balance sheets; ●Stock ownership by management/employees; or ●Experienced and capable management. The market capitalization of companies held by the fund and included in the index changes over time. The fund will not automatically sell or cease to purchase stock of a company it already owns just because the company’s market capitalization grows or falls outside these ranges. The fund may sell assets for a variety of reasons, including in response to a change in the original investment considerations or to limit losses, adjust the characteristics of the overall portfolio, or redeploy assets into different opportunities. In pursuing the fund’s investment objective, the subadvisor has the discretion to deviate from its normal investment criteria, as described above, and purchase securities that the subadvisor believes will provide an opportunity for substantial appreciation. These situations might arise when the subadvisor believes a security could increase in value for a variety of reasons, including a change in management, an extraordinary corporate event, a new product introduction or innovation or a favorable competitive development. While most assets will be invested in U.S. common stocks, the fund may purchase other types of securities, for example: convertible securities and warrants, foreign securities (up to 20% of total assets), and certain exchange-traded funds (ETFs). For purposes of the fund, ETFs are considered securities with a market capitalization equal to the weighted average market capitalization of the basket of securities comprising the ETF. The fund may invest up to 10% of its total assets in hybrid instruments. Hybrid instruments are a type of high-risk derivative that can combine the characteristics of securities, futures and options. Such securities may bear interest or pay dividends at below (or even relatively nominal) rates. The fund may focus its investments in a particular sector or sectors of the economy.
Risk [Heading] rr_RiskHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Principal risks</span>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;font-weight:bold;">Past performance</span>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following information illustrates the variability of the fund’s returns and provides some indication of the risks of investing in the fund by showing changes in the fund’s performance from year to year and by showing how the fund’s average annual returns compared with a broad-based securities market index.Past performance does not indicate future results. The Russell Midcap Value Index shows how the fund’s performance compares against the returns of similar investments. All figures assume dividend reinvestment. The performance information below does not reflect fees and expenses of any variable insurance contract which may use JHVIT as its underlying investment option. If such fees and expenses had been reflected, performance would be lower.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <span style="font-family:Arial Narrow;font-size:9pt;">The following information illustrates the variability of the fund’s returns and provides some indication of the risks of investing in the fund by showing changes in the fund’s performance from year to year and by showing how the fund’s average annual returns compared with a broad-based securities market index.</span>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <span style="font-family:Arial Narrow;font-size:9pt;">Past performance does not indicate future results.</span>
Bar Chart [Heading] rr_BarChartHeading <span style="font-family:Arial Narrow;font-size:9pt;font-weight:bold;">Calendar year total returns (%)—Series NAV</span>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best quarter:Q2 202022.19%Worst quarter:Q1 2020-28.72%
Performance Table Heading rr_PerformanceTableHeading <span style="font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Average annual total returns (%)—as of 12/31/2024</span>
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged <span style="font-family:Arial Narrow;font-size:8pt;">The fund has designated the Russell 3000 Index as its new broad-based securities market index in accordance with the revised definition for such an index.</span>
Mid Value Trust | Risk Lose Money [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Many factors affect performance, and fund shares will fluctuate in price, meaning you could lose money.
Mid Value Trust | Risk Not Insured Depository Institution [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Mid Value Trust | Convertible Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Convertible securities risk.  Convertible securities are subject to certain risks of both equity and debt securities. The market values of convertible securities tend to fall as interest rates rise and rise as interest rates fall. As the market price of underlying common stock declines below the conversion price, the market value of the convertible security tends to be increasingly influenced by its yield.
Mid Value Trust | Credit And Counterparty Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Credit and counterparty risk.  The counterparty to an over-the-counter derivatives contract or a borrower of fund securities may not make timely payments or otherwise honor its obligations.
Mid Value Trust | Economic And Market Events Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Economic and market events risk.  Events in the U.S. and global financial markets, including actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth, may at times result in unusually high market volatility, which could negatively impact performance. Reduced liquidity in credit and fixed-income markets could adversely affect issuers worldwide. Banks and financial services companies could suffer losses if interest rates rise or economic conditions deteriorate.
Mid Value Trust | Equity Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Equity securities risk.  The price of equity securities may decline due to changes in a company’s financial condition or overall market conditions. Securities the manager believes are undervalued may never realize their full potential value, and in certain markets value stocks may underperform the market as a whole.
Mid Value Trust | Exchange Traded Funds Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Exchange-traded funds (ETFs) risk.  The risks of owning shares of an ETF include the risks of owning the underlying securities the ETF holds. Lack of liquidity in an ETF could result in the ETF being more volatile than its underlying securities. An ETF’s shares could trade at a significant premium or discount to its net asset value (NAV). A fund bears ETF fees and expenses indirectly.
Mid Value Trust | Foreign Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Foreign securities risk.  Less information may be publicly available regarding foreign issuers, including foreign government issuers. Foreign securities may be subject to foreign taxes and may be more volatile than U.S. securities. Currency fluctuations and political and economic developments may adversely impact the value of foreign securities. The risks of investing in foreign securities are magnified in emerging markets.
Mid Value Trust | Hedging Derivatives And Other Strategic Transactions Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Hedging, derivatives, and other strategic transactions risk.  Hedging, derivatives, and other strategic transactions may increase a fund’s volatility and could produce disproportionate losses, potentially more than the fund’s principal investment. Risks of these transactions are different from and possibly greater than risks of investing directly in securities and other traditional instruments. Under certain market conditions, derivatives could become harder to value or sell and may become subject to liquidity risk (i.e., the inability to enter into closing transactions). Derivatives and other strategic transactions that the fund intends to utilize include: futures contracts and options. Futures contracts and options generally are subject to counterparty risk.
Mid Value Trust | Hybrid Instrument Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Hybrid instrument risk.  Hybrid instruments (a type of potentially high-risk derivative) combine the elements of futures contracts or options with those of debt, preferred equity or a depository instrument. Hybrid instruments entail greater market risk and may be more volatile than traditional debt instruments, may bear interest or pay preferred dividends at below-market rates, and may be illiquid. The risks of investing in hybrid instruments are a combination of the risks of investing in securities, options, futures, and currencies.
Mid Value Trust | Investment Company Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Investment company securities risk.  Fund shareholders indirectly bear their proportionate share of the expenses of any investment company in which the fund invests. The total return on such investments will be reduced by the operating expenses and fees of such other investment companies, including advisory fees.
Mid Value Trust | Liquidity Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Liquidity risk.  The extent (if at all) to which a security may be sold or a derivative position closed without negatively impacting its market value may be impaired by reduced market activity or participation, legal restrictions, or other economic and market impediments.
Mid Value Trust | Operational And Cybersecurity Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Operational and cybersecurity risk.  Cybersecurity breaches may allow an unauthorized party to gain access to fund assets, customer data, or proprietary information, or cause a fund or its service providers to suffer data corruption or lose operational functionality. Similar incidents affecting issuers of a fund’s securities may negatively impact performance. Operational risk may arise from human error, error by third parties, communication errors, or technology failures, among other causes.
Mid Value Trust | Sector Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Sector risk.  When a fund focuses its investments in certain sectors of the economy, its performance may be driven largely by sector performance and could fluctuate more widely than if the fund were invested more evenly across sectors.
Mid Value Trust | Small And Mid Sized Company Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Small and mid-sized company risk.  Small and mid-sized companies are generally less established and may be more volatile than larger companies. Small and/or mid-capitalization securities may underperform the market as a whole.
Mid Value Trust | Value Investment Style Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Value investment style risk.  Value securities may underperform the market as a whole, which may cause value-oriented funds to underperform equity funds with other investment strategies. Securities the manager believes are undervalued may never perform as expected.
Mid Value Trust | Warrants Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Warrants risk.  The prices of warrants may not precisely reflect the prices of their underlying securities. Warrant holders do not receive dividends or have voting or credit rights. A warrant ceases to have value if not exercised prior to its expiration date.
Mid Value Trust | Series I  
Risk Return Abstract rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.86% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.05%
Other expenses rr_OtherExpensesOverAssets 0.05%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.01% [3]
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [4]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 1.00%
1 year rr_ExpenseExampleYear01 $ 102
3 years rr_ExpenseExampleYear03 321
5 years rr_ExpenseExampleYear05 557
10 years rr_ExpenseExampleYear10 $ 1,235
1 year rr_AverageAnnualReturnYear01 16.24%
5 year rr_AverageAnnualReturnYear05 12.43%
10 year rr_AverageAnnualReturnYear10 9.84%
Mid Value Trust | Series II  
Risk Return Abstract rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.86% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.05%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.21% [3]
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [4]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 1.20%
1 year rr_ExpenseExampleYear01 $ 122
3 years rr_ExpenseExampleYear03 383
5 years rr_ExpenseExampleYear05 664
10 years rr_ExpenseExampleYear10 $ 1,465
1 year rr_AverageAnnualReturnYear01 16.14%
5 year rr_AverageAnnualReturnYear05 12.22%
10 year rr_AverageAnnualReturnYear10 9.62%
Mid Value Trust | NAV  
Risk Return Abstract rr_RiskReturnAbstract  
Management fee rr_ManagementFeesOverAssets 0.86% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.05%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.05% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.96% [3]
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [4]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.95%
1 year rr_ExpenseExampleYear01 $ 97
3 years rr_ExpenseExampleYear03 305
5 years rr_ExpenseExampleYear05 530
10 years rr_ExpenseExampleYear10 $ 1,177
2015 rr_AnnualReturn2015 (3.40%)
2016 rr_AnnualReturn2016 24.09%
2017 rr_AnnualReturn2017 11.46%
2018 rr_AnnualReturn2018 (10.68%)
2019 rr_AnnualReturn2019 19.49%
2020 rr_AnnualReturn2020 9.72%
2021 rr_AnnualReturn2021 24.26%
2022 rr_AnnualReturn2022 (4.30%)
2023 rr_AnnualReturn2023 18.65%
2024 rr_AnnualReturn2024 16.37%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Best quarter:</span>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.19%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <span style="color:#000000;font-family:Arial Narrow;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Worst quarter:</span>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (28.72%)
1 year rr_AverageAnnualReturnYear01 16.37%
5 year rr_AverageAnnualReturnYear05 12.50%
10 year rr_AverageAnnualReturnYear10 9.89%
Mid Value Trust | Russell 3000 Index (reflects no deduction for fees, expenses, or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 23.81% [5]
5 year rr_AverageAnnualReturnYear05 13.86% [5]
10 year rr_AverageAnnualReturnYear10 12.55% [5]
Mid Value Trust | Russell Midcap Value Index (reflects no deduction for fees, expenses, or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 year rr_AverageAnnualReturnYear01 13.07%
5 year rr_AverageAnnualReturnYear05 8.59%
10 year rr_AverageAnnualReturnYear10 8.10%
[1] “Management fee” has been restated to reflect the contractual management fee schedule effective January 1, 2025.
[2] “Acquired fund fees and expenses” are based on indirect net expenses associated with the fund’s investments in underlying investment companies.
[3] The “Total annual fund operating expenses” shown may not correlate to the fund’s ratios of expenses to average daily net assets shown in the “Financial highlights” section of the fund’s prospectus, which does not include “Acquired fund fees and expenses.”
[4] The advisor contractually agrees to waive a portion of its management fee and/or reimburse expenses for the fund and certain other John Hancock funds according to an asset level breakpoint schedule that is based on the aggregate net assets of all the funds participating in the waiver or reimbursement, including the fund (the participating portfolios). This waiver equals, on an annualized basis, 0.0100% of that portion of the aggregate net assets of all the participating portfolios that exceeds $75 billion but is less than or equal to $125 billion; 0.0125% of that portion of the aggregate net assets of all the participating portfolios that exceeds $125 billion but is less than or equal to $150 billion; 0.0150% of that portion of the aggregate net assets of all the participating portfolios that exceeds $150 billion but is less than or equal to $175 billion; 0.0175% of that portion of the aggregate net assets of all the participating portfolios that exceeds $175 billion but is less than or equal to $200 billion; 0.0200% of that portion of the aggregate net assets of all the participating portfolios that exceeds $200 billion but is less than or equal to $225 billion; and 0.0225% of that portion of the aggregate net assets of all the participating portfolios that exceeds $225 billion. The amount of the reimbursement is calculated daily and allocated among all the participating portfolios in proportion to the daily net assets of each participating portfolio. During its most recent fiscal year, the fund’s reimbursement amounted to 0.01% of the fund’s average daily net assets. This agreement expires on July 31, 2026, unless renewed by mutual agreement of the fund and the advisor based upon a determination that this is appropriate under the circumstances at that time.
[5] The fund has designated the Russell 3000 Index as its new broad-based securities market index in accordance with the revised definition for such an index.