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USD Bond (USD Hedged) Index Bloomberg Global Aggregate ex USD Bond (USD Hedged) Index Document Type Document Type Document Period End Date Document Period End Date Entity Central Index Key Entity Central Index Key Amendment Flag Amendment Flag Document Creation Date Document Creation Date Document Effective Date Document Effective Date EntityInvCompanyType EntityInvCompanyType Registrant Name Registrant Name Prospectus Date Prospectus Date Risk/Return [Heading] Risk/Return [Heading] Objective [Heading] Objective [Heading] Objective, Primary [Text Block] Objective, Primary [Text Block] Expense [Heading] Expense [Heading] Expense Narrative [Text Block] Expense Narrative [Text Block] Shareholder Fees Caption [Text] Shareholder Fees Caption [Text] Operating Expenses Caption [Text] Operating Expenses Caption [Text] Expense Example [Heading] Expense Example [Heading] Expense Example Narrative [Text Block] Expense Example Narrative [Text Block] Expense Example, with Redemption, 1 Year 1 Year Expense Example, with Redemption, 3 Years 3 Years Expense Example, with Redemption, 5 Years 5 Years Expense Example, with Redemption, 10 Years 10 Years Portfolio Turnover [Heading] Portfolio Turnover [Heading] Portfolio Turnover [Text Block] Portfolio Turnover [Text Block] Portfolio Turnover, Rate Portfolio Turnover, Rate Strategy [Heading] Strategy [Heading] Strategy Narrative [Text Block] Strategy Narrative [Text Block] Strategy Portfolio Concentration [Text] Strategy Portfolio Concentration [Text] Risk [Heading] Risk [Heading] Risk [Text Block] Risk [Text Block] Bar Chart and Performance Table [Heading] Bar Chart and Performance Table [Heading] Performance Narrative [Text Block] Performance Narrative [Text Block] Performance Information Illustrates Variability of Returns [Text] Performance Information Illustrates Variability of Returns [Text] Performance Past Does Not Indicate Future [Text] Performance Past Does Not Indicate Future [Text] Bar Chart Does Not Reflect Sales Loads [Text] Bar Chart Does Not Reflect Sales Loads [Text] Performance Table Narrative Performance Table Narrative Performance Table Uses Highest Federal Rate Performance Table Uses Highest Federal Rate Performance Table Not Relevant to Tax Deferred Performance Table Not Relevant to Tax Deferred Performance Table One Class of after Tax Shown [Text] Performance Table One Class of after Tax Shown [Text] Performance Table Explanation after Tax Higher Performance Table Explanation after Tax Higher Performance One Year or Less [Text] Performance One Year or Less [Text] Performance Table Closing [Text Block] Performance Table Closing [Text Block] Performance Availability Website Address [Text] Performance Availability Website Address [Text] Bar Chart [Heading] Bar Chart [Heading] Annual Return 2020 Annual Return 2020 Annual Return 2021 Annual Return 2021 Annual Return 2022 Annual Return 2022 Annual Return 2023 Annual Return 2023 Annual Return 2024 Annual Return 2024 Bar Chart Closing [Text Block] Bar Chart Closing [Text Block] Highest Quarterly Return, Label Label Highest Quarterly Return, Date Highest Quarterly Return, Date Highest Quarterly Return Highest Quarterly Return Lowest Quarterly Return, Label Label Lowest Quarterly Return, Date Lowest Quarterly Return, Date Lowest Quarterly Return Lowest Quarterly Return Year to Date Return, Label Year to Date Return, Label Bar Chart, Year to Date Return, Date Bar Chart, Year to Date Return, Date Bar Chart, Year to Date Return Bar Chart, Year to Date Return Performance Table Heading Performance Table Heading Inception Date Inception Date 1 Year 1 Year 5 Years 5 Years Since Inception Since Inception Label Label Index No Deduction for Fees, Expenses, Taxes [Text] Index No Deduction for Fees, Expenses, Taxes [Text] Annual Return 2016 Annual Return 2016 Annual Return 2017 Annual Return 2017 Annual Return 2018 Annual Return 2018 Annual Return 2019 Annual Return 2019 Annual Return 2015 Annual Return 2015 10 Years 10 Years Fee Waiver or Reimbursement over Assets, Date of Termination Fee Waiver or Reimbursement over Assets, Date of Termination Document [Axis] Document [Axis] Series [Axis] Series [Axis] Prospectus Prospectus Prospectus: Prospectus: Risk/Return: Risk/Return: Shareholder Fees [Table] Shareholder Fees [Table] Annual Fund Operating Expenses [Table] Annual Fund Operating Expenses [Table] Expense Example, With Redemption [Table] Expense Example, With Redemption [Table] Expense Example, No Redemption [Table] Expense Example, No Redemption [Table] Bar Chart [Table] Bar Chart [Table] Performance [Table] Performance [Table] Market Index Performance [Table] Market Index Performance [Table] Performance Measure [Axis] Performance Measure [Axis] Share Class [Axis] Share Class [Axis] Before Taxes Before Taxes After Taxes on Distributions After Taxes on Distributions After Taxes on Distributions and Sales After Taxes on Distributions and Sales Risk [Axis] Risk [Axis] All Risks [Member] All Risks [Member] Risk Lose Money [Member] Risk Lose Money [Member] Risk Not Insured [Member] Risk Not Insured [Member] Risk Nondiversified Status [Member] Risk Nondiversified Status [Member] Risk Not Insured Depository Institution [Member] Risk Not Insured Depository Institution [Member] Risk Money Market Fund Price Fluctuates [Member] Risk Money Market Fund Price Fluctuates [Member] Risk Money Market Fund May Impose Fees or Suspend Sales [Member] Risk Money Market Fund May Impose Fees or Suspend Sales [Member] Risk Money Market Fund Sponsor May Not Provide Support [Member] Risk Money Market Fund Sponsor May Not Provide Support [Member] Risk Money Market Fund May Not Preserve Dollar [Member] Risk Money Market Fund May Not Preserve Dollar [Member] Maximum account fee Management fees Distribution and service (12b-1) fees Other expenses Total annual fund operating expenses Fee waiver/expense reimbursement Total annual fund operating expenses after fee waiver/expense reimbursement Risks [Table Text Block] Risks [Table Text Block]