v3.26.1
DWS S&P 500 Index Fund Investment Risks - DWS S&P 500 Index Fund
Apr. 28, 2026
Prospectus [Line Items]  
Risk [Text Block] There are several risk factors that could hurt the fund’s performance, cause you to lose money or cause the fund’s performance to trail that of other investments. The fund may not achieve its investment objective, and is not intended to be a complete investment program. An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The fund is exposed to the risk factors below even if it does not invest directly in individual securities.
Risk Stock Market [Member]  
Prospectus [Line Items]  
Risk [Text Block] Stock market risk. When stock prices fall, you should expect the value of your investment to fall as well. Stock prices can be hurt by poor management on the part of the stock’s issuer, shrinking product demand and other business risks, such as rapid technological developments or widespread adoption of emerging technologies (such as artificial intelligence) impacting the issuer’s competitive position, cybersecurity incidents, financial leverage and labor and supply shortages. These may affect single companies as well as groups of companies. The market as a whole may not favor the types of investments the fund makes, which could adversely affect a stock’s price, regardless of how well the company performs, or the fund’s ability to sell a stock at an attractive price. There is a chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising and falling prices. Events in the US and global financial markets, including actions taken by the US Federal Reserve or foreign central banks to stimulate or stabilize economic growth, may at times result in unusually high market volatility which could negatively affect performance. High market volatility may also result from significant shifts in momentum of one or more specific stocks due to unusual increases or decreases in trading activity. Momentum can change quickly, and securities subject to shifts in momentum may be more volatile than the market as a whole and returns on such securities may drop precipitously. To the extent that the fund invests in a particular geographic region, capitalization or sector, the fund’s performance may be affected by the general performance of that region, capitalization or sector.
Risk Market Disruption [Member]  
Prospectus [Line Items]  
Risk [Text Block] Market disruption risk. Economies and financial markets throughout the world have become increasingly interconnected, which has increased the likelihood that events or conditions in one country or region will adversely impact markets or issuers in other countries or regions. This includes reliance on global supply chains that are susceptible to disruptions resulting from, among other things, war and other armed conflicts, tariffs, extreme weather events, and natural disasters. Such supply chain disruptions can lead to, and have led to, economic and market disruptions that have far-reaching effects on financial markets worldwide. The value of the fund’s investments may be negatively affected by adverse changes in overall economic or market conditions, such as the level of economic activity and productivity, unemployment and labor force participation rates, inflation or deflation (and expectations for inflation or deflation), interest rates, demand and supply for particular products or resources including labor, debt levels and credit ratings, and trade policies, among other factors. Such adverse conditions may contribute to an overall economic contraction across entire economies or markets, which may negatively impact the profitability of issuers operating in those economies or markets. In addition, geopolitical and other globally interconnected occurrences, including war and other armed conflicts, terrorism, economic uncertainty or financial crises, contagion, tariffs and trade disputes, government debt crises (including defaults or downgrades) or uncertainty about government debt payments, government shutdowns, public health crises, natural disasters, supply chain disruptions, climate change and related events or conditions, have led, and in the future may lead, to disruptions in the US and world economies and markets, which may increase financial market volatility and have significant adverse direct or indirect effects on the fund and its investments.Ongoing trade disputes between the United States and other countries may lead to tariffs and investment restrictions, negatively impacting affected companies and their securities. These disputes can also harm the economies of the United States and its trading partners, as well as financial markets overall. Adverse market conditions or disruptions could cause the fund to lose money, experience significant redemptions, and encounter operational difficulties. Although multiple asset classes may be affected by adverse market conditions or a particular market disruption, the duration and effects may not be the same for all types of assets.Current military and other armed conflicts in various geographic regions, including those in Europe and the Middle East, among others, can lead to, and have led to, economic and market disruptions, which may not be limited to the geographic region in which the conflict is occurring. Such conflicts can also result, and have resulted in some cases, in sanctions being levied by the United States, the European Union and/or other countries against countries or other actors involved in the conflict. In addition, such conflicts and related sanctions can adversely affect regional and global energy, commodities, financial and other markets and thus could affect the value of the fund's investments. The extent and duration of any military or other armed conflict, related sanctions and resulting economic and market disruptions are impossible to predict, but could be substantial.Other market disruption events include pandemic spread of viruses, such as the novel coronavirus known as COVID-19, which have caused significant uncertainty, market volatility, decreased economic and other activity, increased government activity, including economic stimulus measures, and supply chain disruptions, and may adversely affect the fund and its investments.In addition, markets are becoming increasingly susceptible to disruption events resulting from the use of new and emerging technologies, such as artificial intelligence, to engage in cyber-attacks or to take over the Web sites and/or social media accounts of companies, governmental entities or public officials, or to otherwise pose as or impersonate such, which then may be used to disseminate false or misleading information that can cause volatility in financial markets or for the securities of a particular company, group of companies, industry or other class of assets.Adverse market conditions or particular market disruptions, such as those discussed above, may magnify the impact of each of the other risks described in this “MAIN RISKS” section and may increase volatility in one or more markets in which the fund invests leading to the potential for greater losses for the fund.
Risk Passive Investing [Member]  
Prospectus [Line Items]  
Risk [Text Block] Passive investing risk. Unlike a fund that is actively managed, in which portfolio management buys and sells securities based on research and analysis, the fund invests in securities included in, or representative of, the index, regardless of their investment merits. Because the fund is designed to maintain a high level of exposure to the index at all times, portfolio management generally will not buy or sell a security unless the security is added or removed, respectively, from the index, and will not take any steps to invest defensively or otherwise reduce the risk of loss during market downturns.
Risk Index Related [Member]  
Prospectus [Line Items]  
Risk [Text Block] Index-related risk. The fund seeks to provide investment results that, before expenses, correspond to the total return of the index as published by the index provider. There is no assurance that the index provider will compile the index accurately, or that the index will be determined, composed or calculated accurately. Market disruptions could cause delays in the index’s rebalancing schedule. During any such delay, it is possible that the index and, in turn, the fund will deviate from the index’s stated methodology and therefore experience returns different than those that would have been achieved under a normal rebalancing schedule. Generally, the index provider does not provide any warranty, or accept any liability, with respect to the quality, accuracy or completeness of the index or its related data, and does not guarantee that the index will be in line with its stated methodology. Errors in the index data, the index computations and/or the construction of the index in accordance with its stated methodology may occur from time to time and may not be identified and corrected by the index provider for a period of time or at all, which may have an adverse impact on the fund and its shareholders. The Advisor and its affiliates do not provide any warranty or guarantee against such errors. Therefore, the gains, losses or costs associated with the index provider’s errors will generally be borne by the fund and its shareholders.
Risk Tracking Error [Member]  
Prospectus [Line Items]  
Risk [Text Block] Tracking error risk. The fund may be subject to tracking error, which is the divergence of the fund’s performance from that of the index. The performance of the fund may diverge from that of the index for a number of reasons, including operating expenses, transaction costs, cash flows and operational inefficiencies. The fund’s return also may diverge from the return of the index because the fund bears the costs and risks associated with buying and selling securities (especially when rebalancing the fund’s securities holdings to reflect changes in the index) while such costs and risks are not factored into the return of the index. Market disruptions and regulatory restrictions could have an adverse effect on the fund’s ability to adjust its exposure in order to track the index. To the extent that portfolio management uses a representative sampling approach (investing in a representative selection of securities included in the index rather than all securities in the index), such approach may cause the fund’s return to not be as well correlated with the return of the index as would be the case if the fund purchased all of the securities in the index in the proportions represented in the index. In addition, the fund may not be able to invest in certain securities included in the index, or invest in them in the exact proportions in which they are represented in the index, due to legal restrictions or limitations imposed by the governments of certain countries, a lack of liquidity in the markets in which such securities trade, potential adverse tax consequences or other reasons. To the extent the fund calculates its net asset value based on fair value prices and the value of the index is based on market prices (i.e., the value of the index is not based on fair value prices), the fund’s ability to track the index may be adversely affected. Tracking error risk may also be heightened during times of increased market volatility or other unusual market conditions. For tax purposes, the fund may sell certain securities, and such sale may cause the fund to recognize a taxable gain or a loss and deviate from the performance of the index. In light of the factors discussed above, the fund’s return may deviate significantly from the return of the index.
Risk Large Sized Companies [Member]  
Prospectus [Line Items]  
Risk [Text Block] Large-sized companies risk. Returns on investments in securities of large companies could trail the returns on investments in securities of smaller and medium-sized companies. Larger companies may be unable to respond as quickly as smaller and medium-sized companies to competitive challenges or to changes in business, product, financial or other market conditions. Larger companies may not be able to maintain growth at the high rates that may be achieved by well-managed smaller and medium-sized companies. During different market cycles, the performance of large-capitalization companies has trailed the overall performance of the broader securities markets.
Risk Derivatives [Member]  
Prospectus [Line Items]  
Risk [Text Block] Derivatives risk. Derivatives involve risks different from, and possibly greater than, the risks associated with investing directly in securities and other more traditional investments. Risks associated with derivatives may include the risk that the derivative is not well correlated with the underlying asset, security or index to which it relates; the risk that derivatives may result in losses or missed opportunities; the risk that the fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation, which risk may be heightened in derivative transactions entered into “over-the-counter” (i.e., not on an exchange or contract market); and the risk that the derivative transaction could expose the fund to the effects of leverage, which could increase the fund's exposure to the market and magnify potential losses.
Risk Securities Lending [Member]  
Prospectus [Line Items]  
Risk [Text Block] Securities lending risk. Securities lending involves the risk that the fund may lose money because the borrower of the loaned securities fails to return the securities in a timely manner or at all. A delay in the recovery of loaned securities could interfere with the fund’s ability to vote proxies or settle transactions. Delayed settlement may limit the ability of the fund to reinvest the proceeds of a sale of securities or prevent the fund from selling securities at times that may be appropriate to track the index. The fund could also lose money in the event of a decline in the value of the collateral provided for the loaned securities, or a decline in the value of any investments made with cash collateral or even a loss of rights in the collateral should the borrower of the securities fail financially while holding the securities.
Risk Counterparty [Member]  
Prospectus [Line Items]  
Risk [Text Block] Counterparty risk. A financial institution or other counterparty with whom the fund does business, or that underwrites, distributes or guarantees any investments or contracts that the fund owns or is otherwise exposed to, may decline in financial health and become unable to honor its commitments. This could cause losses for the fund or could delay the return or delivery of collateral or other assets to the fund.
Risk Liquidity [Member]  
Prospectus [Line Items]  
Risk [Text Block] Liquidity risk. In certain situations, it may be difficult or impossible to sell an investment and/or the fund may sell certain investments at a price or time that is not advantageous in order to meet redemption requests or other cash needs. Unusual market conditions, such as an unusually high volume of redemptions or other similar conditions could increase liquidity risk for the fund.
Risk Pricing [Member]  
Prospectus [Line Items]  
Risk [Text Block] Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods and the value determined for an investment may be materially different from the value realized upon such investment’s sale. As a result, you could pay more than the market value when buying fund shares or receive less than the market value when selling fund shares.
Risk Operational And Technology [Member]  
Prospectus [Line Items]  
Risk [Text Block] Operational and technology risk. The fund and the entities with which it interacts directly or indirectly, including the fund’s service providers and counterparties, issuers of securities held by the fund and other market participants, are susceptible to operational and technology risks, including those related to human errors, processing errors, communication errors, system failures, cybersecurity incidents, and the use of artificial intelligence, among others, which may impair the fund’s operations and/or result in losses for the fund. For example, the fund’s or its service providers’ assets or sensitive or confidential information may be misappropriated, data may be corrupted and operations may be disrupted (e.g., cyber-attacks, operational failures or broader disruptions may cause the release of private shareholder information or confidential fund information, interfere with the processing of shareholder transactions, impact the ability to calculate the fund’s net asset value and impede trading). Market events and disruptions also may trigger a volume of transactions that overloads current information technology and communication systems and processes, impacting the ability to conduct the fund’s operations.While the fund and its service providers may establish business continuity and other plans and processes that seek to address the possibility of and fallout from cyber-attacks, disruptions or failures, there are inherent limitations in such plans and systems, including that they do not apply to third parties, such as fund counterparties, issuers of securities held by the fund or other market participants, as well as the possibility that certain risks have not been identified or that unknown threats may emerge in the future and there is no assurance that such plans and processes will be effective. Among other situations, disruptions (for example, pandemics or health crises) that cause prolonged periods of remote work or significant employee absences at the fund’s service providers could impact the ability to conduct the fund’s operations. In addition, the fund cannot directly control any cybersecurity plans and systems, including artificial intelligence, put in place by its service providers, fund counterparties, issuers of securities held by the fund or other market participants.
Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] There are several risk factors that could hurt the fund’s performance, cause you to lose money or cause the fund’s performance to trail that of other investments.
Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.
Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block] Non-diversification risk. At any given time the fund may be classified as “non-diversified” under the Investment Company Act of 1940, as amended. This means that the fund may invest in securities of relatively few issuers. Thus, the performance of one or a small number of portfolio holdings can affect overall performance.