Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	DEUTSCHE DWS PORTFOLIO TRUST
Prospectus Date	rr_ProspectusDate	Oct. 01, 2022
Class ACR6IS | DWS Floating Rate Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<span style="color:#000000;font-family:Arial;font-size:14pt;">DWS Floating Rate Fund</span>
Objective [Heading]	rr_ObjectiveHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-transform:uppercase;">Investment Objective</span>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks to provide high current income.
Expense [Heading]	rr_ExpenseHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-transform:uppercase;">Fees and Expenses</span>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	These are the fees and expenses you may pay when you buy, hold and sell shares. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts in Class A shares if you and your immediate family invest, or agree to invest in the future, at least $100,000 in DWS funds. More information about these and other discounts and waivers is available from your financial representative and in Choosing a Share Class (p.17), Sales Charge Waivers and Discounts Available Through Intermediaries (Appendix B, p. 44) and Purchase and Redemption of Shares in the fund’s Statement of Additional Information (SAI) (p. II-15).
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<span style="color:#000000;font-family:Arial;font-size:10pt;text-transform:uppercase;">SHAREHOLDER FEES </span><span style="color:#000000;font-family:Arial;font-size:8pt;">(paid directly from your investment)</span>
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<span style="color:#000000;font-family:Arial;font-size:10pt;text-transform:uppercase;">ANNUAL FUND OPERATING EXPENSES</span> <br/><span style="color:#000000;font-family:Arial;font-size:8pt;margin-left:0%;">(expenses that you pay each year as a % of the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	<span style="font-family:Arial;font-size:10pt;">September 30, </span><span style="font-family:Arial;font-size:10pt;">2023</span>
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;text-transform:uppercase;">PORTFOLIO TURNOVER </span>
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 may indicate higher transaction costs and may mean higher taxes if you are investing in a taxable account. These costs are not reflected in annual fund operating expenses or in the expense example, and can affect the fund's performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 32% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	32.00%
Expense Footnotes [Text Block]	rr_ExpenseFootnotesTextBlock	The Advisor has contractually agreed through September 30, 2023 to waive its fees and/or reimburse fund expenses to the extent necessary to maintain the fund’s total annual operating expenses (excluding certain expenses such as extraordinary expenses, taxes, brokerage, interest expenses and acquired fund fees and expenses) at 0.99%, 1.74%, 0.74%, 0.74% and 0.84% for Class A, Class C, Class R6, Institutional Class and Class S, respectively. The agreement may only be terminated with the consent of the fund’s Board.
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Investments of $1,000,000 or more may be eligible to buy Class A shares without a sales charge (load), but may be subject to a contingent deferred sales charge of 1.00% if redeemed within 12 months of the original purchase date and 0.50% if redeemed within 18 months of purchase.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	<span style="font-family:Arial;font-size:10pt;">You may qualify for sales charge </span><span style="font-family:Arial;font-size:10pt;">discounts in Class A shares if you and your immediate family invest, or agree to invest in the future, at least </span><span style="font-family:Arial;font-size:10pt;">$100,000 </span><span style="font-family:Arial;font-size:10pt;"> in DWS funds.</span>
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 100,000
Expense Example [Heading]	rr_ExpenseExampleHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;text-transform:uppercase;">EXAMPLE</span>
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 mutual funds. The Example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem 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 (including one year of capped expenses in each period) remain the same. Class C shares generally convert automatically to Class A shares after 8 years. The information presented in the Example for Class C reflects the conversion of Class C shares to Class A shares after 8 years. See “Class C Shares” in the “Choosing a Share Class” section of the prospectus for more information. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption Narrative [Text Block]	rr_ExpenseExampleNoRedemptionNarrativeTextBlock	You would pay the following expenses if you did not redeem your shares:
Strategy [Heading]	rr_StrategyHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-transform:uppercase;">Principal Investment Strategies</span>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Main investments. Under normal market conditions, the fund invests at least 80% of its total assets in adjustable rate loans that have a senior right to payment (“senior loans”) and other floating rate debt securities. The fund may also borrow money in an amount up to 33 1∕3% of the fund's total assets for a range of purposes, including to create investment leverage.Senior loans typically are of below investment-grade quality and, compared to investment grade loans, may pay higher yields and have higher volatility and higher risk of default on payments of interest or principal. The fund invests in senior loans that may not be rated by a rating agency, registered with the Securities and Exchange Commission or any state securities commission or listed on any national exchange. Senior loans may have longer trade settlement periods than other types of investments.In addition, the fund may invest a portion of its assets in senior loans that are not secured by collateral. Such unsecured loans involve a greater risk of loss.In addition to investments in US-dollar denominated loans of US companies, investments may include US-dollar denominated loans of non-US companies and non-US dollar denominated loans of both US and non-US companies. The fund may acquire senior loans of borrowers engaged in any industry, but will invest no more than 25% of its total assets in senior loans of borrowers and securities of issuers in any one industry. The fund does not have a targeted maturity range for its portfolio.Under normal market conditions, up to 20% of the fund’s total assets may be held in cash and other investments, including, but not limited to, fixed-rate debt obligations, short- to medium-term notes, high-yield securities, which are those rated below the fourth highest credit rating category (that is, grade BB/Ba and below, commonly referred to as junk bonds), equity securities, hybrid and synthetic loans, collateralized loan obligations, and asset-backed securities.Management process. Portfolio management focuses on cash flow and total return analysis, and diversification among sectors, industries and individual issuers. Portfolio management uses an active process, which emphasizes relative value and total return, using intensive research to seek to identify stable to improving credit situations that may provide yield compensation for the risk of owning below investment-grade, floating rate and other investments.The investment process involves a top-down approach to assess the overall risk and return in the market and which considers macro trends in the economy, and a bottom-up approach using relative value and fundamental analysis to seek to select the best investments within each industry. Portfolio management considers a number of factors, including debt leverage and interest coverage,financially material environmental, social and governance (ESG) factors, independent credit research, management visits and conference calls, as part of its analysis and research process.Securities lending. The fund may lend securities (up to one-third of total assets) to approved institutions, such as registered broker-dealers, banks and pooled investment vehicles.
Risk [Heading]	rr_RiskHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-transform:uppercase;">Main Risks</span>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	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.Market risk. Deteriorating market conditions might cause a general weakness in the market that reduces the overall level of securities prices in that market. In addition, an increase in demand for floating rate loans may adversely affect the rate of interest payable on loans acquired by the fund, thus reducing fund returns. During periods of limited supply of senior loans, the fund’s yield may be lower. Because the fund may invest heavily in one category of loans, market risk may be more pronounced for the fund than for funds that invest in a more diverse set of securities.Market disruption risk. Geopolitical and other events, including war, terrorism, economic uncertainty, trade disputes, public health crises and related geopolitical events 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. Market disruptions could cause the fund to lose money, experience significant redemptions, and encounter operational difficulties. Although multiple asset classes may be affected by a market disruption, the duration and effects may not be the same for all types of assets.Russia's recent military incursions in Ukraine have led to, and may lead to, additional sanctions being levied by the United States, European Union and other countries against Russia. Russia's military incursions and the resulting sanctions could adversely affect global energy and financial markets and thus could affect the value of the fund's investments. The extent and duration of the military action, sanctions and resulting market disruptions are impossible to predict, but could be substantial.Other market disruption events include the pandemic spread of the novel coronavirus known as COVID-19, and the significant uncertainty, market volatility, decreased economic and other activity, increased government activity, including economic stimulus measures, and supply chain disruptions that it has caused. The full effects, duration and costs of the COVID-19 pandemic are impossible to predict, and the circumstances surrounding the COVID-19 pandemic will continue to evolve including the risk of future increased rates of infection due to significant portions of the population remaining unvaccinated and/or the lack of effectiveness of current vaccines against new variants. The pandemic has affected and may continue to affect certain countries, industries, economic sectors, companies and investment products more than others, may exacerbate existing economic, political, or social tensions and may increase the probability of an economic recession or depression. The fund and its investments may be adversely affected by the effects of the COVID-19 pandemic, and the pandemic may result in the fund and its service providers experiencing operational difficulties in coordinating a remote workforce and implementing their business continuity plans, among others.Market disruptions, such as those caused by Russian military action and the COVID-19 pandemic, 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.Credit risk. The fund's performance could be hurt if an issuer of a debt security suffers an adverse change in financial condition that results in the issuer not making timely payments of interest or principal, a security downgrade or an inability to meet a financial obligation. Credit risk is greater for lower-rated securities.Because the issuers of high-yield debt securities, or junk bonds (debt securities rated below the fourth highest credit rating category), may be in uncertain financial health, the prices of their debt securities can be more vulnerable to bad economic news, or even the expectation of bad news, than investment-grade debt securities. Credit risk for high-yield securities is greater than for higher-rated securities.When purchasing senior loans, the fund faces the risk that the creditworthiness of the borrower may decline, causing the value of the fund’s interest in a loan to decline. In addition, a borrower may not be able to make timely payments on the interest and principal on the debt obligations it has outstanding. In the event of bankruptcy of a borrower, the fund could experience delays or limitations with respect to its ability to realize the benefits of the collateral securing a senior loan. Senior loans and other floating rate debt securities that are rated below investment grade are considered speculative because of the credit risk of the borrowers. Such borrowers may be more likely to default on payments of interest and principal in response to changes in economic conditions or circumstances. The value of senior loans made to such borrowers is likely to be more sensitive to adverse news about the borrower, markets or economy.Any non-payment of principal or interest could result in a reduction of income to the fund, a reduction in the value of the fund’s interest in the senior loan and a reduction in the fund’s net asset value. There can be no assurance that the liquidation of any collateral securing a senior loan would satisfy the borrower’s obligation in the event of non-payment of scheduled interest or principal payments or that such collateral could be readily liquidated.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, and in extreme conditions, the fund could have difficulty meeting redemption requests.Pricing risk. If market conditions make it difficult to value some investments, the fund may value these investments using more subjective methods, such as fair value pricing. In such cases, the value determined for an investment could be 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.Interest rate risk. When interest rates rise, prices of debt securities generally decline. The longer the effective duration of the fund’s debt securities, the more sensitive the fund will be to interest rate changes. (As a general rule, a 1% rise in interest rates means a 1% fall in value for every year of duration.) Interest rates can change in response to the supply and demand for credit, government and/or central bank monetary policy and action, inflation rates, and other factors. Recent and potential future changes in monetary policy made by central banks or governments are likely to affect the level of interest rates. Changing interest rates may have unpredictable effects on markets, may result in heightened market volatility and potential illiquidity and may detract from fund performance to the extent the fund is exposed to such interest rates and/or volatility. Rising interest rates may prompt redemptions from the fund, which may force the fund to sell investments at a time when it is not advantageous to do so, which could result in losses. Senior loans typically have adjustable interest rates. However, because floating rates on senior loans only reset periodically, changes in prevailing interest rates may cause a fluctuation in the fund’s value. In addition, extreme increases in prevailing interest rates may cause an increase in senior loan defaults, which may cause a further decline in the fund’s value. Conversely, a decrease in interest rates could adversely affect the income earned by the fund from senior loans. Although interest rates in the US remain atlow levels, they have been rising and are expected tocontinue to increase in the near future. Recently, there have been signs of inflationary price movements. As such, fixed-income and related markets may experience heightened levels of interest rate volatility and liquidity risk.London Interbank Offered Rate (LIBOR), the benchmark rate for certain floating rate securities, has been phased out as of the end of 2021 for most maturities and currencies, although certain widely used US Dollar LIBOR rates are expected to continue to be published through June 2023 to assist with the transition. The transition process from LIBOR towards its expected replacement reference rate with the Secured Overnight Financing Rate (SOFR) for US Dollar LIBOR rates has become increasingly well defined, especially following the signing of the federal Adjustable Interest Rate (LIBOR) Act in March 2022 which will replace LIBOR-based benchmark rates in instruments with no, or insufficient, alternative rate-setting provisions with a SOFR-based rate following the cessation of LIBOR. However, the fund or the instruments in which the fund invests may be adversely affected by the transition from LIBOR to SOFR by, among other things, increased volatility or illiquidity.Senior loans risk. The fund invests in senior loans that may not be rated by a rating agency, registered with the SEC or any state securities commission or listed on any national securities exchange. Therefore, there may be less publicly available information about them than for registered or exchange-listed securities. The Advisor relies on its own evaluation of the creditworthiness of borrowers, but will consider, and may rely in part on, analyses performed by others. As a result, the fund is particularly dependent on the analytical abilities of the Advisor.Senior loans may not be considered “securities,” and purchasers, such as the fund, therefore may not be entitled to rely on the anti-fraud and misrepresentation protections of the federal securities laws. Senior loans involve other risks, including credit risk, interest rate risk, liquidity risk, and prepayment and extension risk.Because affiliates of the Advisor may participate in the primary and secondary market for senior loans, limitations under applicable law may restrict the fund’s ability to participate in a restructuring of a senior loan or to acquire some senior loans, or affect the timing or price of such acquisition. The fund also may be in possession of material non-public information about a borrower as a result of its ownership of a senior loan. Because of prohibitions on trading in securities of issuers while in possession of such information, the fund might be unable to enter into a transaction in a publicly-traded security of that borrower when it would otherwise be advantageous to do so. If the Advisor wishes to invest in the publicly traded securities of a borrower, it may not have access to material non-public information regarding the borrower to which other lenders have access.Inflation risk. Inflation risk is the risk that the real value of certain assets or real income from investments (the value of such assets or income after accounting for inflation) will be less in the future as inflation decreases the value of money. Inflation, and investors’ expectation of future inflation, can impact the current value of the fund's portfolio, resulting in lower asset values and losses to shareholders. This risk may be elevated compared to historical market conditions because of recent monetary policy measures and the current interest rate environment.Security selection risk. The securities in the fund’s portfolio may decline in value. Portfolio management could be wrong in its analysis of industries, companies, economic trends, ESG factors, the relative attractiveness of different securities or other matters.Foreign investment risk. The fund faces the risks inherent in foreign investing. Adverse political, economic or social developments, as well as US and foreign government actions such as the imposition of tariffs, economic and trade sanctions or embargoes, could undermine the value of the fund’s investments, prevent the fund from realizing the full value of its investments or prevent the fund from selling securities it holds. In June 2016, citizens of the United Kingdom approved a referendum to leave the European Union (EU) and in March 2017, the United Kingdom initiated the formal process of withdrawing from the EU. On January 31, 2020, the United Kingdom officially withdrew from the EU pursuant to a withdrawal agreement, providing for a transition period in which the United Kingdom negotiated and finalized a trade deal with the EU, the EU-UK Trade and Cooperation Agreement (the Trade Agreement). As a result, as of January 1, 2021 the United Kingdom is no longer part of the EU customs union and single market, nor is it subject to EU policies and international agreements. Among other things, the Trade Agreement provides for zero tariffs and zero quotas on all goods that comply with appropriate rules of origin and establishes the treatment and level of access the United Kingdom and EU have agreed to grant each other’s service suppliers and investors. In addition to trade in goods and services and investment, the Trade Agreement also covers digital trade, intellectual property, public procurement, aviation and road transport, energy, fisheries, social security coordination, law enforcement and judicial cooperation in criminal matters, thematic cooperation and participation in EU programs. Even with the Trade Agreement in place, the United Kingdom’s withdrawal from the EU may create new barriers to trade in goods and services and to cross-border mobility and exchanges, including with respect to trade in financial services which is not comprehensively addressed in the Trade Agreement and remains subject to negotiation between the United Kingdom and the EU. The long-term impact of the United Kingdom’s withdrawal from the EU is still unknown and could have adverse economic and political effects on the United Kingdom, the EU and its member countries, and the global economy, including financial markets and asset valuations.Financial reporting standards for companies based in foreign markets differ from those in the US. Additionally, foreign securities markets generally are smaller and less liquid than US markets. To the extent that the fund invests in non-US dollar denominated foreign securities, changes in currency exchange rates may affect the US dollar value of foreign securities or the income or gain received on these securities. In addition, because non-US markets may be open on days when the fund does not price its shares, the value of the securities in the fund’s portfolio may change on days when shareholders will not be able to purchase or sell the fund’s shares.Prepayment and extension risk. When interest rates fall, issuers of high interest debt obligations may pay off the debts earlier than expected (prepayment risk), and the fund may have to reinvest the proceeds at lower yields. When interest rates rise, issuers of lower interest debt obligations may pay off the debts later than expected (extension risk), thus keeping the fund’s assets tied up in lower interest debt obligations. Ultimately, any unexpected behavior in interest rates could increase the volatility of the fund’s share price and yield and could hurt fund performance. Prepayments could also create capital gains tax liability in some instances.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.Borrowing risk. Borrowing creates leverage. It also adds to fund expenses and at times could effectively force the fund to sell securities when it otherwise might not want to.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. 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.Operational and technology risk. Cyber-attacks, disruptions or failures that affect the fund’s service providers or counterparties, issuers of securities held by the fund, or other market participants may adversely affect the fund and its shareholders, including by causing losses for the fund or impairing fund operations. 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 put in place by its service providers, fund counterparties, issuers of securities held by the fund or other market participants.
Risk Lose Money [Text]	rr_RiskLoseMoney	<span style="color:#000000;font-family:Arial;font-size:10pt;">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.</span>
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	<span style="color:#000000;font-family:Arial;font-size:10pt;">An investment</span><span style="color:#000000;font-family:Arial;font-size:10pt;"> 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.</span>
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;text-transform:uppercase;">Past Performance</span>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index).Past performance may not indicate future results. All performance figures below assume that dividends and distributions were reinvested. For more recent performance figures, go to dws.com (the Web site does not form a part of this prospectus) or call the telephone number included in this prospectus.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	<span style="color:#000000;font-family:Arial;font-size:10pt;">How a fund's returns vary from year to year can give an idea of its risk; so can comparing fund performance to overall market performance (as measured by an appropriate market index).</span>
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	<span style="color:#000000;font-family:Arial;font-size:10pt;">dws.com</span><span style="font-family:Arial;font-size:10pt;">dws.com</span>
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	<span style="color:#000000;font-family:Arial;font-size:10pt;">Past performance may not indicate </span><span style="color:#000000;font-family:Arial;font-size:10pt;">future results.</span>
Bar Chart [Heading]	rr_BarChartHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;text-transform:uppercase;">CALENDAR YEAR TOTAL RETURNS </span><span style="color:#000000;font-family:Arial;font-size:8pt;">(%) (Class A)</span>
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	These year-by-year returns do not include sales charges, if any, and would be lower if they did. Returns for other classes were different and are not shown here.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	<span style="color:#000000;font-family:Arial;font-size:10pt;">These year-by-year returns do not include sales charges, if any, and would be lower if they did.</span>
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	ReturnsPeriod endingBest Quarter6.18%June 30, 2020Worst Quarter-11.09%March 31, 2020Year-to-Date-5.70%June 30, 2022
Performance Table Heading	rr_PerformanceTableHeading	<span style="font-family:Arial;font-size:10pt;text-transform:uppercase;">Average Annual Total Returns</span> <br/><span style="font-family:Arial;font-size:8pt;margin-left:0%;">(For periods ended 12/31/</span><span style="font-family:Arial;font-size:8pt;">2021 expressed as a %)</span>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	<span style="color:#000000;font-family:Arial;font-size:10pt;">After-tax returns (which are shown only for Class A and would be different for other classes)</span><span style="color:#000000;font-family:Arial;font-size:10pt;"> reflect the historical </span><span style="color:#000000;font-family:Arial;font-size:10pt;">highest individual federal income tax rates, but do not reflect any state or local taxes.</span>
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	<span style="color:#000000;font-family:Arial;font-size:10pt;">After-tax returns are not relevant to </span><span style="color:#000000;font-family:Arial;font-size:10pt;">shares held in an IRA, 401(k) or other tax-advantaged investment plan.</span>
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	<span style="color:#000000;font-family:Arial;font-size:10pt;">After-tax returns (which are shown only for Class A and would be different for other classes)</span>
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns (which are shown only for Class A and would be different for other classes) reflect the historical highest individual federal income tax rates, but do not reflect any state or local taxes. Your actual after-tax returns may be different. After-tax returns are not relevant to shares held in an IRA, 401(k) or other tax-advantaged investment plan.
Class ACR6IS | DWS Floating Rate Fund | Class A
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	2.75%
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none	[1]
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	$ 20
Management fee	rr_ManagementFeesOverAssets	0.55%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.43%
Acquired funds fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.03%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.26%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.24%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.02%
1 Year	rr_ExpenseExampleYear01	$ 376
3 Years	rr_ExpenseExampleYear03	641
5 Years	rr_ExpenseExampleYear05	925
10 Years	rr_ExpenseExampleYear10	1,735
1 Year	rr_ExpenseExampleNoRedemptionYear01	376
3 Years	rr_ExpenseExampleNoRedemptionYear03	641
5 Years	rr_ExpenseExampleNoRedemptionYear05	925
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,735
2012	rr_AnnualReturn2012	8.58%
2013	rr_AnnualReturn2013	4.86%
2014	rr_AnnualReturn2014	(0.29%)
2015	rr_AnnualReturn2015	(2.59%)
2016	rr_AnnualReturn2016	4.39%
2017	rr_AnnualReturn2017	1.42%
2018	rr_AnnualReturn2018	(0.73%)
2019	rr_AnnualReturn2019	8.52%
2020	rr_AnnualReturn2020	0.74%
2021	rr_AnnualReturn2021	3.59%
Year to Date Return, Label	rr_YearToDateReturnLabel	<span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Year-to-Date</span>
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2022
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(5.70%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Best Quarter</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	6.18%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Worst Quarter</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2020
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(11.09%)
Class ACR6IS | DWS Floating Rate Fund | Class C
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	$ 20
Management fee	rr_ManagementFeesOverAssets	0.55%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.45%
Acquired funds fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.03%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.03%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.26%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	1.77%
1 Year	rr_ExpenseExampleYear01	$ 280
3 Years	rr_ExpenseExampleYear03	612
5 Years	rr_ExpenseExampleYear05	1,069
10 Years	rr_ExpenseExampleYear10	2,139
1 Year	rr_ExpenseExampleNoRedemptionYear01	180
3 Years	rr_ExpenseExampleNoRedemptionYear03	612
5 Years	rr_ExpenseExampleNoRedemptionYear05	1,069
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 2,139
Class ACR6IS | DWS Floating Rate Fund | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none	[1]
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.55%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.54%
Acquired funds fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.03%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.12%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.35%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.77%
1 Year	rr_ExpenseExampleYear01	$ 79
3 Years	rr_ExpenseExampleYear03	321
5 Years	rr_ExpenseExampleYear05	583
10 Years	rr_ExpenseExampleYear10	1,332
1 Year	rr_ExpenseExampleNoRedemptionYear01	79
3 Years	rr_ExpenseExampleNoRedemptionYear03	321
5 Years	rr_ExpenseExampleNoRedemptionYear05	583
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,332
Class ACR6IS | DWS Floating Rate Fund | INST Class
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none	[1]
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	none
Management fee	rr_ManagementFeesOverAssets	0.55%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.35%
Acquired funds fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.03%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.93%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.16%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.77%
1 Year	rr_ExpenseExampleYear01	$ 79
3 Years	rr_ExpenseExampleYear03	280
5 Years	rr_ExpenseExampleYear05	499
10 Years	rr_ExpenseExampleYear10	1,128
1 Year	rr_ExpenseExampleNoRedemptionYear01	79
3 Years	rr_ExpenseExampleNoRedemptionYear03	280
5 Years	rr_ExpenseExampleNoRedemptionYear05	499
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,128
Class ACR6IS | DWS Floating Rate Fund | Class S
Risk Return Abstract	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases, as % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load), as % of redemption proceeds	rr_MaximumDeferredSalesChargeOverOther	none	[1]
Account Maintenance Fee (annually, for fund account balances below $10,000 and subject to certain exceptions)	rr_MaximumAccountFee	$ 20
Management fee	rr_ManagementFeesOverAssets	0.55%
Distribution/service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.51%
Acquired funds fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.03%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.09%
Fee waiver/expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	0.22%
Total annual fund operating expenses after fee waiver/expense reimbursement	rr_NetExpensesOverAssets	0.87%
1 Year	rr_ExpenseExampleYear01	$ 89
3 Years	rr_ExpenseExampleYear03	325
5 Years	rr_ExpenseExampleYear05	580
10 Years	rr_ExpenseExampleYear10	1,309
1 Year	rr_ExpenseExampleNoRedemptionYear01	89
3 Years	rr_ExpenseExampleNoRedemptionYear03	325
5 Years	rr_ExpenseExampleNoRedemptionYear05	580
10 Years	rr_ExpenseExampleNoRedemptionYear10	$ 1,309
Class ACR6IS | DWS Floating Rate Fund | before tax | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.74%
5 Years	rr_AverageAnnualReturnYear05	2.09%
10 Years	rr_AverageAnnualReturnYear10	2.50%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 29, 2007
Class ACR6IS | DWS Floating Rate Fund | before tax | Class C
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	2.81%
5 Years	rr_AverageAnnualReturnYear05	1.90%
10 Years	rr_AverageAnnualReturnYear10	2.01%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 29, 2007
Class ACR6IS | DWS Floating Rate Fund | before tax | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	3.85%
5 Years	rr_AverageAnnualReturnYear05	2.92%
Since Inception	rr_AverageAnnualReturnSinceInception	2.14%
Class Inception	rr_AverageAnnualReturnInceptionDate	Oct. 01, 2014
Class ACR6IS | DWS Floating Rate Fund | before tax | INST Class
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	3.85%
5 Years	rr_AverageAnnualReturnYear05	2.92%
10 Years	rr_AverageAnnualReturnYear10	3.05%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 29, 2007
Class ACR6IS | DWS Floating Rate Fund | before tax | Class S
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	3.74%
5 Years	rr_AverageAnnualReturnYear05	2.81%
10 Years	rr_AverageAnnualReturnYear10	2.94%
Class Inception	rr_AverageAnnualReturnInceptionDate	Jun. 29, 2007
Class ACR6IS | DWS Floating Rate Fund | After tax on distributions | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(0.54%)
5 Years	rr_AverageAnnualReturnYear05	0.45%
10 Years	rr_AverageAnnualReturnYear10	0.80%
Class ACR6IS | DWS Floating Rate Fund | After tax on distributions and sale of fund shares | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.43%
5 Years	rr_AverageAnnualReturnYear05	0.87%
10 Years	rr_AverageAnnualReturnYear10	1.18%
Class ACR6IS | DWS Floating Rate Fund | S&P/LSTA Leveraged Loan Index (reflects no deduction for fees, expenses or taxes) | Class R6
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.20%
5 Years	rr_AverageAnnualReturnYear05	4.27%
Since Inception	rr_AverageAnnualReturnSinceInception	4.14%
Class ACR6IS | DWS Floating Rate Fund | S&P/LSTA Leveraged Loan Index (reflects no deduction for fees, expenses or taxes) | Class S
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.20%
5 Years	rr_AverageAnnualReturnYear05	4.27%
10 Years	rr_AverageAnnualReturnYear10	4.69%

[1] Investments of $1,000,000 or more may be eligible to buy Class A shares without a sales charge (load), but may be subject to a contingent deferred sales charge of 1.00% if redeemed within 12 months of the original purchase date and 0.50% if redeemed within 18 months of purchase.