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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName INVESCO EXCHANGE-TRADED FUND TRUST
Prospectus Date rr_ProspectusDate Dec. 28, 2018
Invesco Wilshire US REIT ETF  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <b>Invesco Wilshire US REIT ETF</b><br/><br/>Summary Information
Objective [Heading] rr_ObjectiveHeading <b>Investment Objective </b>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Invesco Wilshire US REIT ETF (the “Fund”) seeks to track the investment results (before fees and expenses) of the Wilshire US Real Estate Investment Trust IndexSM (the “Underlying Index”).
Expense [Heading] rr_ExpenseHeading <b>Fund Fees and Expenses </b>
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 (“Shares”). Investors may pay brokerage commissions on their purchases and sales of Shares, which are not reflected in the table or the example below.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <b>Annual Fund Operating Expenses</b><br/><b>(expenses that you pay each year as a percentage of the value of your investment)</b>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <b>Portfolio Turnover </b>
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it purchases and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate will cause the Fund to incur additional transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the example, may affect the Fund’s performance.

During the most recent fiscal year, the portfolio turnover rate of the Guggenheim Wilshire US REIT ETF (the “Predecessor Fund”) and the Fund was 10% of the average value of the portfolio, excluding the value of portfolio securities received or delivered as a result of in-kind creations and redemptions.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions Investors may pay brokerage commissions on their purchases and sales of Shares, which are not reflected in the table or the example below.
Expense Example [Heading] rr_ExpenseExampleHeading <b>Example </b>
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 funds.

This example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. This example does not include the brokerage commissions that investors may pay to buy and sell Shares. Although your actual costs may be higher or lower, your costs, based on these assumptions, would be:
Strategy [Heading] rr_StrategyHeading <b>Principal Investment Strategies </b>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund generally will invest at least 90% of its total assets in the securities that comprise the Underlying Index.

Strictly in accordance with its guidelines and mandated procedures, Wilshire Associates Incorporated (“Wilshire” or the “Index Provider”) compiles, maintains, and calculates the Underlying Index, which is designed to represent a market-based index that is more reflective of equity real estate positions commonly held by pension funds. The Underlying Index is a float-adjusted market capitalization-weighted subset of the broader Wilshire 5000 Total Market Index and is comprised primarily of real estate investment trusts (“REITs”). To be included in the Underlying Index, a security must be issued by a company that, among other things: (i) is both an equity owner and operator of commercial and/or residential real estate, (ii) has a minimum total market capitalization of at least $200 million at the time of its inclusion, and (iii) has at least 75% of the company’s total revenue derived from the ownership and operation of real estate assets as determined by the Index Provider. As of September 30, 2018, the Underlying Index was comprised of 111 securities.

The Fund generally invests in all of the securities comprising the Underlying Index in proportion to their weightings in the Underlying Index.

The Fund is “non-diversified” and therefore is not required to meet certain diversification requirements under the Investment Company Act of 1940, as amended (the “1940 Act”).

Concentration Policy. The Fund will concentrate its investments (i.e., invest more than 25% of the value of its net assets) in securities of issuers in any one industry or group of industries only to the extent that the Underlying Index reflects a concentration in that industry or group of industries. The Fund will not otherwise concentrate its investments in securities of issuers in any one industry or group of industries. As of August 31, 2018, the Fund had significant exposure to the real estate sector. The Fund’s portfolio holdings, and the extent to which it concentrates, are likely to change over time.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Concentration Policy. The Fund will concentrate its investments (i.e., invest more than 25% of the value of its net assets) in securities of issuers in any one industry or group of industries only to the extent that the Underlying Index reflects a concentration in that industry or group of industries. The Fund will not otherwise concentrate its investments in securities of issuers in any one industry or group of industries. As of August 31, 2018, the Fund had significant exposure to the real estate sector. The Fund’s portfolio holdings, and the extent to which it concentrates, are likely to change over time.
Risk [Heading] rr_RiskHeading <b>Principal Risks of Investing in the Fund </b>
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock The following summarizes the principal risks of the Fund.

The Shares will change in value, and you could lose money by investing in the Fund. The Fund may not achieve its investment objective.

Authorized Participant Concentration Risk. Only Authorized Participants (“APs”) may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of institutions that may act as APs and such APs have no obligation to submit creation or redemption orders. Consequently, there is no assurance that those APs will establish or maintain an active trading market for the Shares. This risk may be heightened to the extent that securities underlying the Fund are traded outside a collateralized settlement system. In that case, APs may be required to post collateral on certain trades on an agency basis (i.e., on behalf of other market participants), which only a limited number of APs may be able to do. In addition, to the extent that APs exit the business or are unable to proceed with creation and/or redemption orders with respect to the Fund and no other AP is able to step forward to create or redeem Creation Units (as defined below), this may result in a significantly diminished trading market for Shares which may be more likely to trade at a premium or discount to the Fund’s net asset value (“NAV”) and possibly face trading halts and/or delisting.

Equity Risk. Equity risk is the risk that the value of equity securities, including common stocks, may fall due to both changes in general economic conditions that impact the market as a whole, as well as factors that directly relate to a specific company or its industry. Such general economic conditions include changes in interest rates, periods of market turbulence or instability, or general and prolonged periods of economic decline and cyclical change. It is possible that a drop in the stock market may depress the price of most or all of the common stocks that the Fund holds. In addition, equity risk includes the risk that investor sentiment toward particular industries will become negative. The value of a company’s common stock may fall solely because of factors, such as an increase in production costs, which negatively impact other companies in the same region, industry or sector of the market. A company’s common stock also may decline significantly in price over a short period of time due to factors specific to that company, including decisions made by its management or lower demand for the company’s products or services. For example, an adverse event, such as an unfavorable earnings report or the failure to make anticipated dividend payments, may depress the value of common stock.

Index Risk. Unlike many investment companies, the Fund does not utilize an investing strategy that seeks returns in excess of its Underlying Index. Therefore, the Fund would not necessarily buy or sell a security unless that security is added or removed, respectively, from its Underlying Index, even if that security generally is underperforming.

Industry Concentration Risk. In following its methodology, the Underlying Index from time to time will be concentrated to a significant degree in securities of issuers operating in a single industry or industry group. To the extent that the Underlying Index concentrates in the securities of issuers in a particular industry or industry group, the Fund will also concentrate its investments to approximately the same extent. By concentrating its investments in an industry or industry group, the Fund may face more risks than if it were diversified broadly over numerous industries or industry groups. Such industry-based risks, any of which may adversely affect the companies in which the Fund invests, may include, but are not limited to, legislative or regulatory changes, adverse market conditions and/or increased competition within the industry or industry group. In addition, at times, such industry or industry group may be out of favor and underperform other industries, industry groups or the market as a whole.

Real Estate Sector Risk. Investing in securities of real estate companies includes risks such as: fluctuations in the value of the underlying properties; defaults by borrowers or tenants; market saturation; changes in general and local economic conditions; decreases in market rates for rents; losses from casualty or condemnation; changes in the availability, cost and terms of mortgage funds; increased competition, property taxes, capital expenditures, or operating expenses; and other economic, political or regulatory occurrences, including the impact of changes in environmental laws, that may affect the real estate industry.

Issuer-Specific Changes Risk. The value of an individual security or particular type of security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole.

Market Risk. Securities in the Underlying Index are subject to market fluctuations. You should anticipate that the value of the Shares will decline, more or less, in correlation with any decline in value of the securities in the Underlying Index.

Market Trading Risk. The Fund faces numerous market trading risks, including the potential lack of an active market for the Shares, losses from trading in secondary markets, and disruption in the creation/redemption process of the Fund. Any of these factors may lead to the Shares trading at a premium or discount to the Fund’s NAV.

Micro-Capitalization Company Risk. Investments in the securities of micro capitalization companies involve substantially greater risks of loss and price fluctuations than stocks with larger capitalization. Micro capitalization companies carry additional risks because their earnings and revenues tend to be less predictable (and some companies may experience significant losses), their share prices tend to be more volatile and their markets less liquid than companies with larger market capitalizations. Micro capitalization companies may be newly formed or in the early stages of development, with limited product lines, markets or financial resources, and they may lack management depth. In addition, less public information may be available about these companies. The shares of micro capitalization companies tend to trade less frequently than those of larger, more established companies, which can adversely affect the pricing of these securities and the future ability to sell these securities. Also, the Fund may take a long time before it realizes a gain, if any, on an investment in a micro capitalization company.

Non-Correlation Risk. The Fund’s return may not match the return of the Underlying Index for a number of reasons. For example, the Fund incurs operating expenses not applicable to the Underlying Index, and incurs costs in buying and selling securities, especially when rebalancing the Fund’s securities holdings to reflect changes in the composition of the Underlying Index. In addition, the performance of the Fund and the Underlying Index may vary due to asset valuation differences and differences between the Fund’s portfolio and the Underlying Index resulting from legal restrictions, costs or liquidity constraints.

Non-Diversified Fund Risk. Because the Fund is non-diversified and can invest a greater portion of its assets in securities of individual issuers than a diversified fund, changes in the market value of a single investment could cause greater fluctuations in Share price than would occur in a diversified fund. This may increase the Fund’s volatility and cause the performance of a relatively small number of issuers to have a greater impact on the Fund’s performance.

REIT Risk. REITs are subject to risks inherent in the direct ownership of real estate. These risks include, but are not limited to, a possible lack of mortgage funds and associated interest rate risks, overbuilding, property vacancies, increases in property taxes and operating expenses, changes in zoning laws, losses due to environmental damages and changes in neighborhood values and appeal to purchasers. REITs may be affected by changes in the values of the underlying properties that they own or operate and could fail to qualify for favorable tax or regulatory treatment. REITs also are dependent upon specialized management skills, and their investments may be concentrated in relatively few properties, or in a small geographic area or a single property type. REITs rely heavily on cash flows and a variety of economic and other factors may adversely affect a lessee’s ability to meet its obligations to a REIT. Should a lessee default on their loan, the REIT may experience delays in enforcing its rights as a lessor and may incur substantial costs associated in protecting its investments.

Small- and Mid-Capitalization Securities Risk. Investing in securities of small- and mid-capitalization companies involves greater risk than customarily is associated with investing in larger, more established companies. These companies’ securities may be more volatile and less liquid than those of more established companies. These securities may have returns that vary, sometimes significantly, from the overall securities market. Often small- and mid-capitalization companies and the industries in which they focus are still evolving and, as a result, they may be more sensitive to changing market conditions.
Risk Lose Money [Text] rr_RiskLoseMoney <b>The Shares will change in value, and you could lose money by investing in the Fund.</b>
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Non-Diversified Fund Risk. Because the Fund is non-diversified and can invest a greater portion of its assets in securities of individual issuers than a diversified fund, changes in the market value of a single investment could cause greater fluctuations in Share price than would occur in a diversified fund. This may increase the Fund’s volatility and cause the performance of a relatively small number of issuers to have a greater impact on the Fund’s performance.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <b>Performance </b>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart below shows how the Fund has performed. The table below the bar chart shows the Fund’s average annual total returns (before and after taxes). The bar chart and table provide an indication of the risks of investing in the Fund by showing how the Fund’s total returns have varied from year to year and by showing how the Fund’s average annual total return compared with a broad measure of market performance and an additional index with characteristics relevant to the Fund. Although the information shown in the bar chart and the table gives you some idea of the risks involved in investing in the Fund, the Fund’s past performance (before and after taxes) is not necessarily indicative of how the Fund will perform in the future.

The Fund is the successor to the investment performance of the Predecessor Fund as a result of the reorganization of the Predecessor Fund into the Fund, which was consummated after the close of business on May 18, 2018. Accordingly, the performance information shown below for periods ending on or prior to May 18, 2018 is that of the Predecessor Fund. Updated performance information is available online at www.invesco.com/ETFs.
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 showing how the Fund’s total returns have varied from year to year and by showing how the Fund’s average annual total return compared with a broad measure of market performance and an additional index with characteristics relevant to the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.invesco.com/ETFs
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Although the information shown in the bar chart and the table gives you some idea of the risks involved in investing in the Fund, the Fund’s past performance (before and after taxes) is not necessarily indicative of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading <b>Annual Total Returns—Calendar Years </b>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter    Worst Quarter
15.31% (4th Quarter 2011)   
(14.70)% (3rd Quarter 2011)

The Fund’s year-to-date total return for the nine months ended September 30, 2018 was 2.07%.
Performance Table Heading rr_PerformanceTableHeading <b>Average Annual Total Returns for the Periods Ended December 31, 2017 </b>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns in the table below are calculated using the historical highest 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 an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold Shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns shown are not relevant to investors who hold Shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Invesco Wilshire US REIT ETF | Invesco Wilshire US REIT ETF  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.32%
Other Expenses rr_OtherExpensesOverAssets none
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.32%
1 Year rr_ExpenseExampleYear01 $ 33
3 Years rr_ExpenseExampleYear03 103
5 Years rr_ExpenseExampleYear05 180
10 Years rr_ExpenseExampleYear10 $ 406
2011 rr_AnnualReturn2011 8.81%
2012 rr_AnnualReturn2012 17.14%
2013 rr_AnnualReturn2013 1.50%
2014 rr_AnnualReturn2014 31.34%
2015 rr_AnnualReturn2015 3.98%
2016 rr_AnnualReturn2016 6.72%
2017 rr_AnnualReturn2017 3.72%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.07%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <b>Best Quarter</b>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.31%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <b>Worst Quarter</b>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (14.70%)
1 Year rr_AverageAnnualReturnYear01 3.72%
5 Years rr_AverageAnnualReturnYear05 8.94%
Since Inception rr_AverageAnnualReturnSinceInception 11.83%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 09, 2010
Invesco Wilshire US REIT ETF | Return After Taxes on Distributions | Invesco Wilshire US REIT ETF  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.30%
5 Years rr_AverageAnnualReturnYear05 7.39%
Since Inception rr_AverageAnnualReturnSinceInception 10.40%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 09, 2010
Invesco Wilshire US REIT ETF | Return After Taxes on Distributions and Sale of Fund Shares | Invesco Wilshire US REIT ETF  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.10%
5 Years rr_AverageAnnualReturnYear05 6.27%
Since Inception rr_AverageAnnualReturnSinceInception 8.91%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 09, 2010
Invesco Wilshire US REIT ETF | Wilshire US Real Estate Investment Trust Index℠ (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.18%
5 Years rr_AverageAnnualReturnYear05 9.35%
Since Inception rr_AverageAnnualReturnSinceInception 12.16%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 09, 2010
Invesco Wilshire US REIT ETF | FTSE NAREIT Equity REIT Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.23%
5 Years rr_AverageAnnualReturnYear05 9.46%
Since Inception rr_AverageAnnualReturnSinceInception 12.08%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 09, 2010