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IQ Hedge Macro Tracker ETF  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock
INDEXIQ ETF TRUST
(the “Trust”)
IQ Hedge Macro Tracker ETF
(the “Fund”)
Supplement dated December 30, 2021 (“Supplement”)
to the Summary Prospectus and Prospectus dated August 31, 2021
Capitalized terms and certain other terms used in this Supplement have the meanings assigned to them in the Summary Prospectus and Prospectus.
Risk/Return [Heading] rr_RiskReturnHeading IQ Hedge Macro Tracker ETF
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
Effective December 31, 2021, all references to the HFRI Macro (Total) Index are hereby deleted. Additionally, the Fund has added the Barclay Global Macro Index as an additional index. As a result, the “Performance Information” section in the Summary Prospectus and Prospectus is hereby replaced with the following:
Performance Information
The bar chart that follows shows the annual total returns of the Fund for a full calendar year. The table that follows the bar chart shows the Fund’s average annual total returns, both before and after taxes. The bar chart and table provide an indication of the risks of investing in the Fund by comparing the Fund’s performance from year to year and by showing how the Fund’s average annual returns for one calendar year compared with its underlying index and additional broad measures of market performance. The MSCI World Index has replaced the Fund’s comparative index, which is not available for the Fund’s use. The MSCI World Index is a free float-adjusted market capitalization weighted index that is designed to measure the equity market performance of developed markets (performance data assumes reinvestment of dividends, but it does not reflect management fees, transaction costs or other expenses). The Barclay Global Macro Index is a measure of the average net returns of all reporting global macro funds in the BarclayHedge database.
All returns assume reinvestment of dividends and distributions. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Performance reflects fee waivers and/or expense reimbursement in effect, if such waivers or reimbursements were not in place, the Fund’s performance would be reduced. Fund performance current to the most recent month-end is available by calling 1-888-474-7725 or by visiting newyorklifeinvestments.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table provide an indication of the risks of investing in the Fund by comparing the Fund’s performance from year to year and by showing how the Fund’s average annual returns for one calendar year compared with its underlying index and additional broad measures of market performance.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Barclay Global Macro Index is a measure of the average net returns of all reporting global macro funds in the BarclayHedge database.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-474-7725
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress newyorklifeinvestments.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
The Fund’s year-to-date total return as of June 30, 2021 was 1.28%.
Best and Worst Quarter Returns (for the period reflected in the bar chart above)
​ ​ ​
Return
​ ​
Quarter/Year
​
Highest Return ​ ​ ​ ​ 9.04% ​ ​ ​ ​ ​ 2Q/2020 ​ ​
Lowest Return ​ ​ ​ ​ -8.65% ​ ​ ​ ​ ​ 1Q/2020 ​ ​
Year to Date Return, Label rr_YearToDateReturnLabel The Fund’s year-to-date total return as of June 30, 2021 was
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.28%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 9.04%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (8.65%)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads All returns assume reinvestment of dividends and distributions.
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective December 31, 2021, all references to the HFRI Macro (Total) Index are hereby deleted. Additionally, the Fund has added the Barclay Global Macro Index as an additional index.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on your tax situation and may differ from those shown and are not relevant if you hold your Shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In some cases the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund Shares at the end of the measurement period.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
Investors Should Retain This Supplement for Future Reference
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of December 31, 2020
IQ Hedge Macro Tracker ETF | IQ Hedge Macro Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.28%
5 Years rr_AverageAnnualReturnYear05 4.86%
10 Years rr_AverageAnnualReturnYear10 2.09%
IQ Hedge Macro Tracker ETF | MSCI World Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.90%
5 Years rr_AverageAnnualReturnYear05 12.19%
10 Years rr_AverageAnnualReturnYear10 9.87%
IQ Hedge Macro Tracker ETF | Barclay Global Macro Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.06%
5 Years rr_AverageAnnualReturnYear05 3.48%
10 Years rr_AverageAnnualReturnYear10 2.71%
IQ Hedge Macro Tracker ETF | IQ Hedge Macro Tracker ETF  
Risk/Return: rr_RiskReturnAbstract  
Annual Return 2011 rr_AnnualReturn2011 (3.42%)
Annual Return 2012 rr_AnnualReturn2012 5.84%
Annual Return 2013 rr_AnnualReturn2013 (3.27%)
Annual Return 2014 rr_AnnualReturn2014 (1.30%)
Annual Return 2015 rr_AnnualReturn2015 (4.11%)
Annual Return 2016 rr_AnnualReturn2016 1.17%
Annual Return 2017 rr_AnnualReturn2017 8.32%
Annual Return 2018 rr_AnnualReturn2018 (5.09%)
Annual Return 2019 rr_AnnualReturn2019 8.22%
Annual Return 2020 rr_AnnualReturn2020 8.68%
1 Year rr_AverageAnnualReturnYear01 8.68%
5 Years rr_AverageAnnualReturnYear05 4.11%
10 Years rr_AverageAnnualReturnYear10 1.36%
IQ Hedge Macro Tracker ETF | IQ Hedge Macro Tracker ETF | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.63% [1]
5 Years rr_AverageAnnualReturnYear05 3.71% [1]
10 Years rr_AverageAnnualReturnYear10 0.96% [1]
IQ Hedge Macro Tracker ETF | IQ Hedge Macro Tracker ETF | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.18% [1]
5 Years rr_AverageAnnualReturnYear05 3.02% [1]
10 Years rr_AverageAnnualReturnYear10 0.88% [1]
[1] After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown and are not relevant if you hold your Shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. In some cases the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund Shares at the end of the measurement period.