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Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Sep. 30, 2023
Registrant Name dei_EntityRegistrantName MORGAN STANLEY ETF TRUST
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Central Index Key dei_EntityCentralIndexKey 0001676326
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Oct. 12, 2023
Document Effective Date dei_DocumentEffectiveDate Oct. 12, 2023
Prospectus Date rr_ProspectusDate Oct. 07, 2023
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Parametric Equity Premium Income ETF (the “Fund”) seeks to provide consistent monthly income while maintaining prospects for capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay fees other than the fees and expenses of the Fund, such as brokerage commissions and other fees charged by financial intermediaries, which are not reflected in the tables and examples below.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses1  (expenses that you pay each year as a percentage of the value of your investment) [1]
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other Expenses have been estimated for the current fiscal year.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The example below is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The example does not take into account brokerage commissions that you pay when purchasing or selling shares of the Fund.
The example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell your shares at the end of those periods. The example also assumes your investment has a 5% return each year and the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Total Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. Because the Fund had not commenced operations as of the most recent fiscal year end, no portfolio turnover rate is available for the Fund.
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund is an actively managed exchange-traded fund (“ETF”). The investment objective of the Fund is to seek to provide consistent monthly income while maintaining prospects for capital appreciation. The Adviser and Parametric Portfolio Associates LLC (the “Sub-Adviser”) seek to fulfill the Fund’s objective by using two principal strategies (1) creating an actively-managed portfolio of dividend-paying equity securities that primarily include common stocks of U.S. companies selected from the Russell 3000® Index (the “long equity portfolio”); and (2) selling (writing) option contracts on the SPDR S&P 500® ETF Trust (the “Underlying ETF”) or on the S&P 500® Index to generate additional yield.
Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities. This policy may be changed without shareholder approval; however, shareholders would be notified upon 60 days’ notice in writing of any changes. Equity securities in which the Fund may invest include common stocks.
The Fund seeks to employ a top-down, disciplined, and systematic investment process that emphasizes a diversified portfolio of quality companies that over the prior 12 months have demonstrated high current income and lower levels of risk on a sector relative basis. Such companies may be referred to as durable dividend payers. This rules-based strategy applies a series of durability rankings to a broad universe of U.S. equity securities (i.e., equity securities of companies included in the Russell 3000® Index). To achieve broad diversification, each economic sector generally receives an equal weight. The top-ranked securities within each sector based on the Sub-Adviser’s yield and risk screening are also generally weighted equally. The investment process is periodically re-evaluated and may be adjusted to ensure that the process is consistent with the Fund’s investment objective and strategies. The portfolio is rebalanced periodically to maintain diversification and is reconstituted on an annual basis. The portfolio managers seek to manage portfolio risk by using a quantitative model to construct a diversified portfolio of durable dividend paying companies.
The Fund will systemically sell (write) out-of-the-money call option contracts, which have an expiration date of approximately two weeks, with an objective of generating incremental income. The Fund will sell such call option contracts on the Underlying ETF or on the S&P 500® Index. Flexible Exchange Options (“FLEX Options”) that reference the Underlying ETF may be utilized. The Fund’s derivative instruments are generally limited to its call option writing strategy.
In general, an option contract is an agreement between a buyer and a seller that gives the purchaser of the option the right to purchase (in the case of a call option) or sell (in the case of a put option) the underlying asset (or deliver cash equal to the value of an underlying index) at a specified price (“strike price”) within a specified time period or at a specified future date. Selling a call option entitles the seller to a premium equal to the value of the option at the time of the trade. In the event the underlying asset declines in value, the value of a call option will generally decrease (and may end up worthless). Conversely, in the event the underlying asset appreciates in value, the value of a call option will generally increase. FLEX Options are customizable exchange-traded option contracts guaranteed for settlement by the Options Clearing Corporation (the “OCC”). Option terms that can be customized include exercise price, exercise styles, and expiration dates.
A call option is considered “out-of-the-money” when the strike price of the option at expiration exceeds the current price of the underlying asset. By selling call options, the Fund will receive premiums but will give up the opportunity to benefit from potential increases in the value of the Underlying ETF or the S&P 500® Index above the exercise prices of such options.
As a result of writing call options, the Fund may forgo performance in market environments with significant equity market appreciation in which the Underlying ETF or S&P 500® Index exceeds the strike price of the written call option. However, the Sub-Adviser will seek to “ladder” the Fund’s written call option positions to mitigate this risk. “Laddering” is an investment technique that utilizes multiple option positions over multiple expiration dates to reduce the concentration risk of a concentrated exposure to a single option expiration and to create more opportunities to roll option positions (i.e., one option position expires and a new option position is opened in the same underlying security) during extended periods of market appreciation. In this regard, the Sub-Adviser expects to write more frequent, short-dated call options with two-week expirations in tranches with such expirations being staggered approximately every three to four trading days. The Sub-Adviser believes that this may provide the opportunity for a more diversified options portfolio with more consistent greater upside appreciation profile compared to a written call option portfolio with a single position. Additionally, the Sub-Adviser believes that the laddering of short-dated call options may provide a more stable option premium income for the portfolio, as each call option in the portfolio is expected to be a short-dated call option with a two-week expiration (either expiring worthless or with a liability) and, upon expiration, is expected to be replaced with a new short-dated call option with a two-week expiration.
The Fund may incorporate tax loss harvesting within the long equity portfolio to maximize realization of losses. Realized losses in the long equity portfolio may be used to offset realized gains in the written option portfolio and long equity portfolio.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
As of the date hereof, the Fund has not yet completed a full calendar year of investment operations. Upon the completion of a full calendar year of investment operations by the Fund, this section will include charts that provide some indication of the risks of an investment in the Fund, by showing the difference in annual total returns, highest and lowest quarterly returns and average annual total returns (before and after taxes) compared to the benchmark index selected for the Fund. Performance information for the Fund will be available online at www.eatonvance.com or by calling toll-free 800-836-2414.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-836-2414
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.eatonvance.com
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Risk Lose Money [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock There is no assurance that the Fund will achieve its  investment objective, and you can lose money investing  in this Fund.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Risk Not Insured Depository Institution [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock Shares of the Fund are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Equity Securities [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Equity Securities. In general, prices of equity securities are more volatile than those of fixed-income securities. The prices of equity securities fluctuate, and sometimes widely fluctuate, in response to activities specific to the issuer of the security as well as factors unrelated to the fundamental condition of the issuer, including general market, economic, political conditions and public health conditions. During periods when equity securities experience heightened volatility, such as during periods of market, economic or financial uncertainty or distress, the Fund’s investments in equity securities may be subject to heightened risks.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Income Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Income Risk. The Fund’s ability to distribute income to shareholders will depend on the yield available on the common stocks held by the Fund and the premiums received by the Fund with respect to its written call options. Changes in the dividend policies of companies held by the Fund could make it more difficult for the Fund to provide a consistent monthly income.  For example, if the stocks held by the Fund reduce or stop paying dividends, the Fund’s ability to generate income may be adversely affected. In addition, the premiums received by the Fund with respect to its written call options will vary over time and based on market conditions.
 
The Fund seeks to provide consistent monthly income while maintaining prospects for capital appreciation. However, there is no guarantee that the Fund will make monthly income payments to its shareholders or, if made, that the Fund’s monthly income payments to shareholders will remain consistent. For example, in the event the value of the asset underlying a written call option exceeds the strike price plus the premium received by the Fund with respect to the option, the Fund’s ability to provide consistent monthly income may be adversely impacted. The amount of the Fund’s distributions for any period may exceed the amount of the Fund’s income and gains for that period. In that case, some or all of the Fund’s distributions may constitute a return of capital to shareholders.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Liquidity [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Liquidity. The Fund may make investments that are illiquid or restricted or that may become illiquid or less liquid in response to overall economic conditions or adverse investor perceptions, and which may entail greater risk than investments in other types of
securities. These investments may be more difficult to value or sell, particularly in times of market turmoil, and there may be little trading in the secondary market available for particular securities. If the Fund is forced to sell an illiquid or restricted security to fund redemptions or for other cash needs, it may be forced to sell the security at a loss or for less than its fair value.
 
In the event that trading in the underlying FLEX Options is limited or absent, the value of the Fund’s FLEX Options may decrease. There is no guarantee that a liquid secondary trading market will exist for the FLEX Options. The trading in FLEX Options may be less deep and liquid than the market for certain other securities, including certain non-customized option contracts. In a less liquid market for the FLEX Options, terminating the FLEX Options may require the payment of a premium or acceptance of a discounted price and may take longer to complete. Additionally, the liquidation of a large number of FLEX Options may more significantly impact the price in a less liquid market. Further, the Fund requires a sufficient number of participants to facilitate the purchase and sale of options on an exchange to provide liquidity to the Fund for its FLEX Option positions. A less liquid trading market may adversely impact the value of the FLEX Options and the value of your investment.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Market and Geopolitical Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Market and Geopolitical Risk. The value of your investment in the Fund is based on the values of the Fund’s investments, which may change due to economic and other events that affect markets generally, as well as those that affect particular regions, countries, industries, companies or governments. These events may be sudden and unexpected, and could adversely affect the liquidity of the Fund’s investments, which may in turn impact valuation, the Fund’s ability to sell securities and/or its ability to meet redemptions. The risks associated with these developments may be magnified if certain social, political, economic and other conditions and events (such as war, natural disasters, epidemics and pandemics, terrorism, conflicts, social unrest, recessions, inflation, rapid interest rate changes and supply chain disruptions) adversely interrupt the global economy and financial markets. It is difficult to predict when events affecting the U.S. or global financial markets may occur, the effects that such events may have and the duration of those effects (which may last for extended periods). These events may negatively impact broad segments of businesses and populations and have a significant and rapid negative impact on the performance of the Fund’s investments, adversely affect and increase the volatility of the Fund’s share price and exacerbate pre-existing risks to the Fund.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Derivatives [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Derivatives. Derivatives and other similar instruments that create synthetic exposure often are subject to risks similar to those of the underlying asset or instrument, including market risk, and may be subject to additional risks, including imperfect correlation between the value of the derivative and the underlying asset, risks of default by the counterparty to certain transactions, magnification of losses incurred due to changes in the market value of the securities, instruments, indices or interest rates to which the derivative instrument relates, risks that the transactions may not be liquid, risks arising from margin and payment requirements, risks arising from mispricing or valuation complexity and operational and legal risks. Certain derivative transactions may give rise to a form of leverage. Leverage magnifies the potential for gain and the risk of loss.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Call Option Writing Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Call Option Writing Risk. Writing call options involves the risk that the Fund may be required to sell the underlying security or instrument (or settle in cash an amount of equal value) at a disadvantageous price or below the market price of such underlying security or instrument, at the time the option is exercised. As the writer of a call option, the Fund forgoes, during the option’s life, the opportunity to profit from increases in the market value of the underlying security or instrument covering the option above the sum of the premium and the exercise price, but retains the risk of loss should the price of the underlying security or instrument decline. Additionally, the Fund’s call option writing strategy may not fully protect it against declines in the value of the market.
 
During periods in which equity markets are generally unchanged or falling, or in a modestly rising market where the income from premiums exceeds the aggregate appreciation of the underlying security or instrument over its exercise price, a diversified portfolio receiving premiums from its call option writing strategy may outperform the same portfolio without such an options strategy. However, in rising markets where the aggregate appreciation of the underlying security or instrument over its exercise price exceeds the income from premiums, a portfolio with a call writing strategy could significantly underperform the same portfolio without such an options writing strategy.
 
The Fund will also incur a form of economic leverage through its use of call options, which could increase the volatility of the Fund’s returns and may increase the risk of loss to the Fund.
 
There are special risks associated with uncovered option writing which expose the Fund to potentially significant loss. As the seller of an uncovered call option, the Fund bears unlimited risk of loss should the price of the underlying security increase above the exercise price until the Fund covers its exposure.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | FLEX Options [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
FLEX Options. The Fund utilizes FLEX Options guaranteed for settlement by the OCC. The FLEX Options traded by the Fund are listed on the Chicago Board Options Exchange. Options positions are marked to market daily. Although guaranteed for settlement by the OCC, FLEX Options are still subject to counterparty risk with the OCC and may be less liquid than more traditional exchange-traded option contracts. The Fund bears the risk that the OCC will be unable or unwilling to perform its obligations under the FLEX Options contracts. In the unlikely event that the OCC becomes insolvent or is otherwise unable to meet its settlement obligations, the Fund could suffer significant losses. FLEX Options are subject to the risk that they may be less liquid than certain other securities, such as standardized options. In less liquid markets, termination of FLEX Options may require the payment of a premium or acceptance of a discounted price and may take longer to complete and/or the liquidation of a large
number of options may significantly impact the price of the options and may adversely impact the value of your investment. Additionally, in connection with the creation and redemption of Fund shares, to the extent market participants are not willing or able to enter into FLEX Option transactions with the Fund at prices that reflect the market price of Fund shares, the Fund’s NAV and, in turn the share price of the Fund, could be negatively impacted.
 
As an in-the-money FLEX Option approaches its expiration date, its value typically will increasingly move with the value of the Underlying ETF. However, the value of the FLEX Options prior to the expiration date may vary because of related factors other than the value of the Underlying ETF. The value of the FLEX Options will be determined based upon market quotations or using other recognized pricing methods. Factors that may influence the value of the FLEX Options generally include interest rate changes, dividends, the actual and implied volatility levels of the Underlying ETF’s share price, and the remaining time until the FLEX Options expire, among others. The value of the FLEX Options held by the Fund typically do not increase or decrease at the same rate as the Underlying ETF’s share price on a day-to-day basis due to these factors (although they generally move in the same direction), and, as a result, the Fund’s NAV may not increase or decrease at the same rate as the Underlying ETF’s share price. The Fund may experience losses from certain FLEX Option positions and certain FLEX Option positions may expire with little to no value.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | ETF Structure Risks [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
ETF Structure Risks.
 
Authorized Participant Concentration Risk. Only an authorized participant may engage in creation or redemption transactions directly with the Fund. The Fund has a limited number of intermediaries that act as authorized participants and none of these authorized participants is or will be obligated to engage in creation or redemption transactions. There can be no assurance that an active trading market for the Fund’s shares will develop or be maintained. To the extent that these intermediaries exit the business or are unable to or choose not to proceed with creation and/or redemption orders with respect to the Fund, such as during periods of market stress, and no other authorized participant creates or redeems, shares may trade at a discount to net asset value (“NAV”) and possibly face trading halts and/or delisting.
 
Trading Risk. The market prices of shares are expected to fluctuate, in some cases materially, in response to changes in the Fund’s NAV, the intra-day value of the Fund’s holdings, and supply and demand for shares. The Adviser and/or Sub-Adviser cannot predict whether shares will trade above, below or at their NAV. Disruptions to creations and redemptions, the existence of significant market volatility or potential lack of an active trading market for the shares (including through a trading halt), as well as other factors, may result in the shares trading significantly above (at a premium) or below (at a discount) to NAV or to the intraday value of the Fund’s holdings. You may pay significantly more or receive significantly less than NAV during periods when there is a significant premium or discount. Buying or selling shares in the secondary market may require paying brokerage commissions or other charges imposed by brokers as determined by that broker. Brokerage commissions are often a fixed amount and may be a significant proportional cost when seeking to buy or sell relatively small amounts of shares. In addition, the market price of shares, like the price of any exchange-traded security, includes a “bid-ask spread” charged by the market makers or other participants that trade the particular security. The spread of the Fund’s shares varies over time based on the Fund’s trading volume and market liquidity and may increase if the Fund’s trading volume, the spread of the Fund’s underlying securities, or market liquidity decrease.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Active Management Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Active Management Risk. In pursuing the Fund’s investment objective, the Adviser and/or Sub-Adviser has considerable leeway in deciding which investments to buy, hold or sell on a day-to-day basis, and which trading strategies to use. For example, the Adviser or Sub-Adviser, in its discretion, may determine to use some permitted trading strategies while not using others. The success or failure of such decisions will affect the Fund’s performance. The Sub-Adviser uses proprietary investment techniques and analyses in making investment decisions for the Fund, seeking to achieve its investment objective while minimizing exposure to security-specific risk. The strategy seeks to take advantage of certain quantitative and behavioral market characteristics identified by the Sub-Adviser, utilizing a rules-based process and systematic rebalancing. A systematic investment process is dependent on the Sub-Adviser’s skill in developing and maintaining that process. The Fund’s strategy has not been independently tested or validated, and there can be no assurance that it will achieve the desired results. In addition, in implementing this rule-based management process, the Fund may not necessarily sell or otherwise close a position as a result of fundamental investment analysis or adverse changes in a company’s financial position or outlook.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Investment Objective Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Investment Objective Risk. There is no guarantee that the Adviser and/or Sub-Adviser will be successful in managing the Fund to provide consistent (monthly) distributable income combined with capital appreciation through equity market exposure. The Fund may underperform its benchmark, particularly in rising markets. In addition, the Fund does not guarantee that distributions will always be paid or will be paid at a relatively stable level.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | New Fund Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
New Fund Risk. A new fund’s performance may not represent how the fund is expected to or may perform in the long term. In addition, new funds have limited operating histories for investors to evaluate and new funds may not attract sufficient assets to achieve investment and trading efficiencies.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Correlation [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Correlation.  As an in-the-money FLEX Option approaches its expiration date, its value typically will increasingly move with the value of the Underlying ETF. However, the value of the FLEX Options may vary prior to the expiration date because of related
factors other than the value of the Underlying ETF. The value of the FLEX Options will be determined based upon market quotations or using other recognized pricing methods. Factors that may influence the value of the FLEX Options include interest rate changes and implied volatility levels of the Underlying ETF, among others. The value of the FLEX Options held by the Fund typically do not increase or decrease at the same level as the Underlying ETF’s share price on a day-to-day basis due to these factors (although they generally move in the same direction).
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Clearing Member Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Clearing Member Risk. Transactions in some types of derivatives, including FLEX Options, are required to be centrally cleared (“cleared derivatives”). In a transaction involving cleared derivatives, the Fund’s counterparty is a clearing house, such as the OCC, rather than a bank or broker. Since the Fund is not a member of clearing houses and only members of a clearing house (“clearing members”) can participate directly in the clearing house, the Fund will hold cleared derivatives through accounts at clearing members. In cleared derivatives positions, the Fund will make payments to and receive payments from a clearing house through their accounts at clearing members. The Fund is also subject to the risk that a limited number of clearing members are willing to transact on the Fund’s behalf, which heightens the risks associated with a clearing member’s default. If a clearing member defaults, the Fund could lose some or all of the benefits of a transaction entered into by the Fund with the clearing member. The loss of a clearing member for the Fund to transact with could result in increased transaction costs and other operational issues that could impede the Fund’s ability to implement its investment strategy. If the Fund cannot find a clearing member to transact with on the Fund’s behalf, the Fund may be unable to effectively implement its investment strategy.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Counterparty [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Counterparty. Counterparty risk generally refers to the risk that a counterparty on a derivatives transaction may not be willing or able to perform its obligations under the derivatives contract, and the related risks of having concentrated exposure to such a counterparty. The OCC acts as guarantor and central counterparty with respect to FLEX Options. As a result, the ability of the Fund to meet its objective depends on the OCC being able to meet its obligations. In the event an OCC clearing member that is a counterparty of the Fund were to become insolvent, the Fund may have some or all of its FLEX Options closed without its consent or may experience delays or other difficulties in attempting to close or exercise its affected FLEX Options positions, both of which would impair the Fund’s ability to deliver on its investment strategy. The OCC’s rules and procedures are designed to facilitate the prompt settlement of options transactions and exercises, including for clearing member insolvencies. However, there is the risk that the OCC and its backup system will fail if clearing member insolvencies are substantial or widespread. In the unlikely event that the OCC becomes insolvent or is otherwise unable to meet its settlement obligations, the Fund could suffer significant losses.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | Tax Risk [Member]  
Prospectus: rr_ProspectusTable  
Risk [Text Block] rr_RiskTextBlock
Tax Risk. The Fund intends to limit the overlap between its stock holdings and the stock holdings of the Underlying ETF or Underlying Index to less than 70% on an ongoing basis in an effort to avoid being subject to the “straddle rules” under federal income tax law. In general, investment positions will be offsetting if there is a substantial diminution in the risk of loss from holding one position by reason of holding one or more other positions. The Fund expects that the option contracts it writes will not be considered straddles because its stock holdings will be sufficiently dissimilar from the stock holdings of the Underlying ETF or Underlying Index under applicable guidance established by the IRS. Under certain circumstances, however, the Fund may enter into options transactions or certain other investments that may constitute positions in a straddle. The straddle rules may affect the character of gains (or losses) realized by the Fund, and losses realized by the Fund on positions that are part of a straddle may be deferred under the straddle rules, rather than being taken into account in calculating taxable income for the taxable year in which the losses are realized. In addition, certain carrying charges (including interest expense) associated with positions in a straddle may be required to be capitalized rather than deducted currently. Certain elections that the Fund may make with respect to its straddle positions may also affect the amount, character and timing of the recognition of gains or losses from the affected positions and may decrease the amount of the Fund’s dividends that may be reported as qualified dividend income. The tax consequences of such straddle transactions to the Fund are not entirely clear in all situations under currently available authority. The straddle rules may increase the amount of short-term capital gain realized by the Fund, which is taxed as ordinary income when distributed to U.S. shareholders in a non- liquidating distribution. Because application of the straddle rules may affect the character of gains or losses, defer losses and/or accelerate the recognition of gains or losses from the affected straddle positions, the amount which must be distributed to U.S. shareholders as ordinary income may be increased or decreased substantially as compared to a fund that did not engage in such transactions.
(Morgan Stanley ETF Trust) | (Morgan Stanley Parametric Equity Premium Income ETF) | (Parametric Equity Premium Income ETF)  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.29% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets none [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.29%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 30
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 93
[1]
1 The Fund’s management agreement provides that the Fund’s “Adviser,” Morgan Stanley Investment Management Inc., will pay substantially all expenses of the Fund (including expenses of Morgan Stanley ETF Trust (the “Trust”) relating to the Fund), except for the distribution fees, if any, brokerage expenses, acquired fund fees and expenses, taxes, interest, litigation expenses, and other extraordinary expenses, including the costs of proxies, not incurred in the ordinary course of the Fund’s business.
[2]
2 Other Expenses have been estimated for the current fiscal year.