Label | Element | Value | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Document Type | dei_DocumentType | 485BPOS | ||||||||||
Document Period End Date | dei_DocumentPeriodEndDate | Dec. 31, 2024 | ||||||||||
Entity Registrant Name | dei_EntityRegistrantName | JNL INVESTORS SERIES TRUST | ||||||||||
Entity Central Index Key | dei_EntityCentralIndexKey | 0001121257 | ||||||||||
Entity Inv Company Type | dei_EntityInvCompanyType | N-1A | ||||||||||
Amendment Flag | dei_AmendmentFlag | false | ||||||||||
Document Creation Date | dei_DocumentCreationDate | Apr. 24, 2025 | ||||||||||
Document Effective Date | dei_DocumentEffectiveDate | Apr. 28, 2025 | ||||||||||
Prospectus Date | rr_ProspectusDate | Apr. 28, 2025 | ||||||||||
JNL Government Money Market Fund | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Objective [Heading] | rr_ObjectiveHeading | Investment Objective. | ||||||||||
Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | The investment objective of the Fund is to achieve as high a level of current income as is consistent with the preservation of capital and maintenance of liquidity.
|
||||||||||
Expense [Heading] | rr_ExpenseHeading | Expenses. | ||||||||||
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.
You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
|
||||||||||
Shareholder Fees Caption [Text] | rr_ShareholderFeesCaption | Shareholder Fees (fees paid directly from your investment) Not Applicable | ||||||||||
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) | ||||||||||
Expense Example [Heading] | rr_ExpenseExampleHeading | Expense Example. | ||||||||||
Expense Example Narrative [Text Block] | rr_ExpenseExampleNarrativeTextBlock | This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The table below shows the expenses you would pay on a $10,000 investment, assuming (1) 5% annual return; (2) redemption at the end of each time period; and (3) that the Fund operating expenses remain the same. The example also assumes that the Class SL administrative fee waiver is discontinued after one year. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
|
||||||||||
Strategy [Heading] | rr_StrategyHeading | Principal Investment Strategies. | ||||||||||
Strategy Narrative [Text Block] | rr_StrategyNarrativeTextBlock | Under normal circumstances, the Fund seeks to achieve its investment objective by investing at least 99.5% of its total assets in cash, U.S. Government securities, and/or repurchase agreements that are “collateralized fully” (i.e., collateralized by cash or government securities). The government securities typically have a maximum remaining maturity of 397 calendar days and the repurchase agreements are collateralized by cash or government securities. Under normal circumstances, the Fund will invest at least 80% of its assets (net assets plus the amount of any borrowings made for investment purposes) in government securities or repurchase agreements collateralized by government securities. As a government money market fund, the Fund is exempt from requirements that permit money market funds to impose a liquidity fee. While the Fund’s Board of Trustees may elect to subject the Fund to liquidity fee requirements in the future, the Board of Trustees has not elected to do so at this time.
The Fund seeks to maintain a stable net asset value of $1.00 per share, neither the Federal Deposit Insurance Company, nor any other government agency insures or protects your investment.
|
||||||||||
Risk [Heading] | rr_RiskHeading | Principal Risks of Investing in the Fund. | ||||||||||
Bar Chart and Performance Table [Heading] | rr_BarChartAndPerformanceTableHeading | Performance. | ||||||||||
Performance Narrative [Text Block] | rr_PerformanceNarrativeTextBlock | The performance information shown 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 those of a broad-based securities market index and an additional index that the Adviser believes more closely reflects the market segments in which the Fund invests. Performance results include the effect of expense waiver/reduction arrangements for some or all of the periods shown. If such arrangements had not been in place, performance for those periods would have been lower. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Prior to September 19, 2016, the Fund was operated as a prime money market fund. Effective September 19, 2016, the Fund operates as a government money market fund and, as such, invests at least 99.5% of its total assets in cash, government securities and/or repurchase agreements that are “collateralized fully” (i.e., backed by cash or government securities). Performance prior to February 1, 2024 reflects the Fund’s results when managed by the former sub-adviser, Wellington Management Company LLP.
Effective December 31, 2024, for consistency with the Fund’s principal investment strategies, the Fund added the Bloomberg U.S. Aggregate Index as the Fund’s primary benchmark and the Bloomberg USD 1 Month Cash Deposit Index as the Fund’s secondary benchmark.
was %.
was %.
|
||||||||||
Performance Information Illustrates Variability of Returns [Text] | rr_PerformanceInformationIllustratesVariabilityOfReturns | The performance information shown 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 those of a broad-based securities market index and an additional index that the Adviser believes more closely reflects the market segments in which the Fund invests. Performance results include the effect of expense waiver/reduction arrangements for some or all of the periods shown. | ||||||||||
Performance Past Does Not Indicate Future [Text] | rr_PerformancePastDoesNotIndicateFuture | The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. | ||||||||||
Bar Chart [Heading] | rr_BarChartHeading | Annual Total Returns as of December 31 | ||||||||||
Bar Chart Closing [Text Block] | rr_BarChartClosingTextBlock |
(ended ): %; (ended ): % (ended ): %; (ended ): % |
||||||||||
Performance Table Heading | rr_PerformanceTableHeading | Average Annual Total Returns as of 12/31/2024 | ||||||||||
JNL Government Money Market Fund | Risk Lose Money [Member] | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Risk [Text Block] | rr_RiskTextBlock | You could lose money by investing in the Fund. | ||||||||||
JNL Government Money Market Fund | Risk Money Market Fund May Not Preserve Dollar [Member] | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Risk [Text Block] | rr_RiskTextBlock | Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. | ||||||||||
JNL Government Money Market Fund | Risk Not Insured [Member] | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Risk [Text Block] | rr_RiskTextBlock | An investment in the Fund is not a bank account and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. | ||||||||||
JNL Government Money Market Fund | Risk Money Market Fund Sponsor May Not Provide Support [Member] | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Risk [Text Block] | rr_RiskTextBlock | The Fund’s sponsor is not required to reimburse the Fund for losses, and you should not expect that the sponsor will provide financial support to the Fund at any time, including during periods of market stress. | ||||||||||
JNL Government Money Market Fund | Fixed-income risk [Member] | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Risk [Text Block] | rr_RiskTextBlock |
|
||||||||||
JNL Government Money Market Fund | Income risk [Member] | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Risk [Text Block] | rr_RiskTextBlock |
|
||||||||||
JNL Government Money Market Fund | Interest rate risk [Member] | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Risk [Text Block] | rr_RiskTextBlock |
|
||||||||||
JNL Government Money Market Fund | Repurchase agreements, purchase and sale contracts risk [Member] | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Risk [Text Block] | rr_RiskTextBlock |
|
||||||||||
JNL Government Money Market Fund | U.S. Government securities risk [Member] | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Risk [Text Block] | rr_RiskTextBlock |
|
||||||||||
JNL Government Money Market Fund | Class I | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Management Fees (as a percentage of Assets) | rr_ManagementFeesOverAssets | 0.08% | ||||||||||
Distribution and Service (12b-1) Fees | rr_DistributionAndService12b1FeesOverAssets | none | ||||||||||
Other Expenses (as a percentage of Assets): | rr_OtherExpensesOverAssets | 0.11% | [1] | |||||||||
Expenses (as a percentage of Assets) | rr_ExpensesOverAssets | 0.19% | ||||||||||
Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 19 | ||||||||||
Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 61 | ||||||||||
Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 107 | ||||||||||
Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | $ 243 | ||||||||||
Annual Return 2015 | rr_AnnualReturn2015 | 0.05% | ||||||||||
Annual Return 2016 | rr_AnnualReturn2016 | 0.25% | ||||||||||
Annual Return 2017 | rr_AnnualReturn2017 | 0.73% | ||||||||||
Annual Return 2018 | rr_AnnualReturn2018 | 1.71% | ||||||||||
Annual Return 2019 | rr_AnnualReturn2019 | 2.08% | ||||||||||
Annual Return 2020 | rr_AnnualReturn2020 | 0.34% | ||||||||||
Annual Return 2021 | rr_AnnualReturn2021 | 0.01% | ||||||||||
Annual Return 2022 | rr_AnnualReturn2022 | 1.31% | ||||||||||
Annual Return 2023 | rr_AnnualReturn2023 | 4.92% | ||||||||||
Annual Return 2024 | rr_AnnualReturn2024 | 5.13% | ||||||||||
Highest Quarterly Return, Label | rr_HighestQuarterlyReturnLabel | Best Quarter | ||||||||||
Highest Quarterly Return, Date | rr_BarChartHighestQuarterlyReturnDate | Dec. 31, 2023 | ||||||||||
Highest Quarterly Return | rr_BarChartHighestQuarterlyReturn | 1.32% | ||||||||||
Lowest Quarterly Return, Label | rr_LowestQuarterlyReturnLabel | Worst Quarter | ||||||||||
Lowest Quarterly Return, Date | rr_BarChartLowestQuarterlyReturnDate | Mar. 31, 2022 | ||||||||||
Lowest Quarterly Return | rr_BarChartLowestQuarterlyReturn | none | ||||||||||
1 Year | rr_AverageAnnualReturnYear01 | 5.13% | ||||||||||
5 Years | rr_AverageAnnualReturnYear05 | 2.32% | ||||||||||
10 Years | rr_AverageAnnualReturnYear10 | 1.64% | ||||||||||
Money Market Seven Day Yield, Caption [Text] | rr_MoneyMarketSevenDayYieldCaption | The 7-day yield of the Class I (formerly named Institutional Class) on December 31, 2024, | ||||||||||
Money Market Seven Day Yield | rr_MoneyMarketSevenDayYield | 4.36% | ||||||||||
JNL Government Money Market Fund | Class I | Bloomberg U.S. Aggregate Index (reflects no deduction for fees, expenses, or taxes) | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
1 Year | rr_AverageAnnualReturnYear01 | 1.25% | ||||||||||
5 Years | rr_AverageAnnualReturnYear05 | (0.33%) | ||||||||||
10 Years | rr_AverageAnnualReturnYear10 | 1.35% | ||||||||||
JNL Government Money Market Fund | Class I | Bloomberg USD 1 Month Cash Deposit Index SPLICE (reflects no deduction for fees, expenses, or taxes) | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
1 Year | rr_AverageAnnualReturnYear01 | 5.40% | [2] | |||||||||
5 Years | rr_AverageAnnualReturnYear05 | 2.53% | [2] | |||||||||
10 Years | rr_AverageAnnualReturnYear10 | 1.77% | [2] | |||||||||
JNL Government Money Market Fund | Class SL | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
Management Fees (as a percentage of Assets) | rr_ManagementFeesOverAssets | 0.08% | ||||||||||
Distribution and Service (12b-1) Fees | rr_DistributionAndService12b1FeesOverAssets | none | ||||||||||
Other Expenses (as a percentage of Assets): | rr_OtherExpensesOverAssets | 0.11% | [3] | |||||||||
Expenses (as a percentage of Assets) | rr_ExpensesOverAssets | 0.19% | ||||||||||
Fee Waiver or Reimbursement | rr_FeeWaiverOrReimbursementOverAssets | (0.10%) | [4] | |||||||||
Net Expenses (as a percentage of Assets) | rr_NetExpensesOverAssets | 0.09% | ||||||||||
Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | $ 9 | ||||||||||
Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 51 | ||||||||||
Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 97 | ||||||||||
Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | $ 233 | ||||||||||
Annual Return 2024 | rr_AnnualReturn2024 | 5.25% | ||||||||||
Highest Quarterly Return, Label | rr_HighestQuarterlyReturnLabel | Best Quarter | ||||||||||
Highest Quarterly Return, Date | rr_BarChartHighestQuarterlyReturnDate | Mar. 31, 2024 | ||||||||||
Highest Quarterly Return | rr_BarChartHighestQuarterlyReturn | 1.32% | ||||||||||
Lowest Quarterly Return, Label | rr_LowestQuarterlyReturnLabel | Worst Quarter | ||||||||||
Lowest Quarterly Return, Date | rr_BarChartLowestQuarterlyReturnDate | Dec. 31, 2024 | ||||||||||
Lowest Quarterly Return | rr_BarChartLowestQuarterlyReturn | 1.18% | ||||||||||
1 Year | rr_AverageAnnualReturnYear01 | 5.25% | ||||||||||
Since Inception | rr_AverageAnnualReturnSinceInception | 5.25% | ||||||||||
Inception Date | rr_AverageAnnualReturnInceptionDate | May 01, 2023 | ||||||||||
Money Market Seven Day Yield, Caption [Text] | rr_MoneyMarketSevenDayYieldCaption | The 7-day yield of the Class SL on December 31, 2024, | ||||||||||
Money Market Seven Day Yield | rr_MoneyMarketSevenDayYield | 4.46% | ||||||||||
JNL Government Money Market Fund | Class SL | Bloomberg U.S. Aggregate Index (reflects no deduction for fees, expenses, or taxes) | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
1 Year | rr_AverageAnnualReturnYear01 | 1.25% | ||||||||||
Since Inception | rr_AverageAnnualReturnSinceInception | 1.87% | ||||||||||
JNL Government Money Market Fund | Class SL | Bloomberg USD 1 Month Cash Deposit Index SPLICE (reflects no deduction for fees, expenses, or taxes) | ||||||||||||
Prospectus [Line Items] | rr_ProspectusLineItems | |||||||||||
1 Year | rr_AverageAnnualReturnYear01 | 5.40% | [5] | |||||||||
Since Inception | rr_AverageAnnualReturnSinceInception | 5.42% | [5] | |||||||||
|