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Label Element Value
Prospectus: rr_ProspectusTable  
Supplement Text Block jhvit-20200212_SupplementTextBlock
John Hancock Variable Insurance Trust (the Trust)
Supplement dated February 12, 2020 to the current Prospectus (the prospectus), as may be supplemented
 
Disciplined Value International Trust (the fund)
(formerly International Value Trust)
 
The following information supplements and supersedes any information to the contrary relating to the fund contained in the current prospectus effective on or about February 12, 2020.
 
Fees and expenses
 
This table describes the fees and expenses that you may pay if you buy and hold shares of the fund. The fees and expenses do 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.
 
Annual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment) Series I Series II Series NAV
Management fee1 0.78 0.78 0.78
Distribution and service (Rule 12b-1) fees 0.05 0.25 0.00
Other expenses2 0.09 0.09 0.09
Total annual fund operating expenses 0.92 1.12 0.87  
Contractual expense reimbursement3 -0.01 -0.01 -0.01
Total annual fund operating expenses after expense reimbursements 0.91 1.11 0.86
 
1 "Management fee" has been restated to reflect the contractual management fee schedule effective February 12, 2020.
2 "Other expenses" have been restated from fiscal year amounts to reflect current fees, expenses, and assets.
3 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. This waiver is allocated proportionally among the participating funds. 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, 2021, 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.
 
Expense example
 
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:
 
Expenses ($) Series I Series II Series NAV
1 year 93 113 88
3 years 292 355 277
5 years 508 616 481
10 years 1,130 1,362 1,072  
 
(John Hancock Variable Insurance Trust) | (Disciplined Value International Trust)  
Prospectus: rr_ProspectusTable  
Expense [Heading] rr_ExpenseHeading Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold shares of the fund. The fees and expenses do 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.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (%) (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2021
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent "Other expenses" have been restated from fiscal year amounts to reflect current fees, expenses, and assets.
Expense Example [Heading] rr_ExpenseExampleHeading Expense example
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:
(John Hancock Variable Insurance Trust) | (Disciplined Value International Trust) | Series I  
Prospectus: rr_ProspectusTable  
Management fee rr_ManagementFeesOverAssets 0.78% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.05%
Other expenses rr_OtherExpensesOverAssets 0.09% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.92%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [3]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.91%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 93
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 292
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 508
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,130
(John Hancock Variable Insurance Trust) | (Disciplined Value International Trust) | Series II  
Prospectus: rr_ProspectusTable  
Management fee rr_ManagementFeesOverAssets 0.78% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.09% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.12%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [3]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 1.11%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 113
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 355
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 616
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,362
(John Hancock Variable Insurance Trust) | (Disciplined Value International Trust) | Series NAV  
Prospectus: rr_ProspectusTable  
Management fee rr_ManagementFeesOverAssets 0.78% [1]
Distribution and service (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.09% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.87%
Contractual expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [3]
Total annual fund operating expenses after expense reimbursements rr_NetExpensesOverAssets 0.86%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 88
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 277
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 481
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,072
[1] "Management fee" has been restated to reflect the contractual management fee schedule effective February 12, 2020.
[2] "Other expenses" have been restated from fiscal year amounts to reflect current fees, expenses, and assets.
[3] 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. This waiver is allocated proportionally among the participating funds. 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, 2021, 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.