Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	PRINCIPAL FUNDS, INC.
Prospectus Date	rr_ProspectusDate	Dec. 31, 2022
Diversified Real Asset Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	<span style="color:#000000;font-family:Arial;font-size:12pt;font-weight:bold;text-transform:uppercase;">Diversified Real Asset Fund</span><span style="font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0%;">SHARE CLASS CONVERSION NOTICE</span><span style="font-family:Arial;font-size:10pt;">: On June 14, 2022, the Fund’s Board of Directors approved the conversion of the Fund’s Class R-5 shares into Class R-6 shares. Following the close of business on or about January 13, 2023, Class R-5 shares of the Fund will automatically convert into Class R-6 shares of the Fund on the basis of the share classes’ relative net asset values on such date. The conversion will not result in the imposition of any charges. As a result of the conversion, the affected shareholders will be in a better position with respect to expenses, as expenses are lower for Class R-6 shares than for the current Class R-5 shares. The Fund expects these share class conversions will not constitute taxable sales or exchanges to shareholders.</span><span style="font-family:Arial;font-size:10pt;font-style:italic;">On or about January 13, 2023, delete references to Class R-5 shares of this Fund from the Prospectus.</span>
Objective [Heading]	rr_ObjectiveHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Objective</span>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks a long-term total return in excess of inflation.
Expense [Heading]	rr_ExpenseHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Fees and Expenses of the Fund</span>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. 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 if you and your family invest, or agree to invest in the future, at least $100,000 in Class A shares of Principal Funds, Inc. More information about these and other discounts is available from your financial intermediary and in “Choosing a Share Class and The Costs of Investing” beginning on page 117 of the Fund’s Prospectus, Appendix B to the Prospectus titled “Intermediary-Specific Sales Charge Waivers and Reductions,” and “Multiple Class Structure” beginning on page 4 of the Fund’s Statement of Additional Information.If you purchase Institutional Class or Class R-6 shares through certain programs offered by certain financial intermediaries, you may be required to pay a commission and/or other forms of compensation to the broker, or to your Financial Professional or other financial intermediary.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Shareholder Fees (fees paid directly from your investment)</span>
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Annual Fund Operating Expenses</span> <br/><span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0%;">(expenses that you pay each year as a percentage 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:8pt;">December 30, </span><span style="font-family:Arial;font-size:8pt;">2023</span>
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">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 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 Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 90.9% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	90.90%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	<span style="font-family:Arial;font-size:10pt;">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the </span><span style="font-family:Arial;font-size:10pt;">future, at least $</span><span style="font-family:Arial;font-size:10pt;">100,000</span><span style="font-family:Arial;font-size:10pt;"> in Class A shares of Principal Funds, Inc.</span>
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 100,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	<span style="font-family:Arial;font-size:8pt;">Fees have been restated to</span><span style="font-family:Arial;font-size:8pt;line-height:10pt;"> </span><span style="font-family:Arial;font-size:8pt;">reflect current</span><span style="font-family:Arial;font-size:8pt;line-height:10pt;"> </span><span style="font-family:Arial;font-size:8pt;">fees.</span>
Expense Example [Heading]	rr_ExpenseExampleHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">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. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The calculation of costs takes into account any applicable contractual fee waivers and/or expense reimbursements for the period noted in the table above. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the Fund invests at least 80% of its net assets, plus any borrowings for investment purposes, in investments related to real assets and real asset companies. The Fund allocates its assets among general investment categories related to real assets, which include tangible assets and investments that are expected to perform well in periods of rising or high inflation, such as the following: infrastructure, natural resources, commodities, real estate, inflation-indexed bonds, and floating rate debt. In pursuing these strategies, the Fund invests in equity securities, including growth and value securities, of any market capitalization size (small, medium, large); fixed-income securities, which are not managed to any particular maturity or duration; U.S. and foreign securities; and derivative instruments, such as forwards, futures, swaps, and options. A derivative is a financial arrangement, the value of which is derived from, or based on, a traditional security, asset, or market index. The Fund concentrates its investments (invests more than 25% of its net assets) in securities of one or more of the following industries: real estate, energy, natural resources, and infrastructure.In managing the Fund, Principal Global Investors, LLC (“PGI”), the Fund’s investment advisor, determines the Fund’s strategic asset allocation among actively managed and passively managed (index) strategies that are executed by PGI and multiple sub-advisors. PGI has considerable latitude in allocating the Fund’s assets. The Fund uses strategies and sub-advisors to varying degrees and may change allocations, add new or eliminate existing strategies and sub-advisors, and temporarily or permanently reduce allocations from time to time such that the Fund would have little or no assets allocated to a particular strategy or sub-advisor.Infrastructure.  The Fund invests in companies that own or operate infrastructure assets related to the transportation, communications, water, electricity transmission and distribution, and oil and gas storage, processing, and transportation industries.Natural Resources.  The Fund invests in securities of companies that primarily own, explore, mine, process, or otherwise develop natural resources, renewable energy, or agricultural commodities and products, or that supply goods and services to such companies. These include companies contributing to and/or profiting from, these sectors, especially those active in production, processing, and supply chain services. These also include companies that are developing technologies, processes, products, and services relating to more efficient use, delivery, storage, management, or conversion of natural resources or products derived from natural resources, such as water treatment companies, smart electricity grid companies, companies that focus on creating energy efficiency for industrial processes, and companies focused on renewable energy resources. Natural resources generally include precious metals, such as gold, silver and platinum; ferrous and nonferrous metals, such as iron, aluminum, and copper; strategic metals, such as uranium and titanium; hydrocarbons, such as coal, oil, and natural gas; timber and wood products; and undeveloped real property.Commodities.  Commodities are assets that have tangible properties, such as oil, coal, natural gas, agricultural products, industrial metals, livestock, and precious metals. To gain exposure to the commodities markets without investing directly in physical commodities, the Fund invests in a wholly-owned subsidiary of the Fund organized under the laws of the Cayman Islands (the “Cayman Subsidiary”) and fixed-income securities (primarily short-term U.S. Treasury and Agency notes and bonds). In order to gain exposure to the commodity markets within the limitations of certain federal tax law requirements, the Cayman Subsidiary invests in commodity-linked equities, commodity-linked exchange traded funds (ETFs), and commodity-linked derivatives, including commodity-linked swaps, commodity futures, and forward contracts and/or options on commodities, as well as instruments such as fixed-income securities (cash, cash equivalents, and/or U.S. Treasury and Agency notes and bonds), either as investments or to serve as margin or collateral for the Cayman Subsidiary’s derivatives positions.Real Estate.  The Fund invests in equity securities of companies that have at least 50% of their assets, income, or profits derived from products or services related to the real estate industry (“real estate companies”). Real estate companies include real estate investment trusts (“REITs”), REIT-like entities, and companies with substantial real estate holdings such as paper, lumber, hotel, and entertainment companies, as well as building supply manufacturers, mortgage lenders, and mortgage servicing companies.Inflation-Indexed Bonds.  The Fund invests in inflation-indexed bonds issued by the U.S. and non-U.S. governments, their agencies, or instrumentalities and by U.S. and non-U.S. corporations. Inflation-indexed bonds are fixed-income securities that are structured to provide protection against inflation. The value of the bond’s principal or the interest income paid on the bond is adjusted to track changes in an official inflation measure.Floating Rate Debt.  The Fund invests in below-investment-grade (sometimes called “junk”) or comparable unrated floating rate debt (also known as bank loans, syndicated loans, leveraged loans or senior floating rate interests). Floating rate debt has a variable coupon that resets periodically, with interest payments determined by a representative interest rate index (e.g., LIBOR, SOFR, the federal funds rate, or a similar reference rate) plus a fixed spread. As a result, the coupon payments vary, or “float” with prevailing market interest rates.
Strategy Portfolio Concentration [Text]	rr_StrategyPortfolioConcentration	<span style="font-family:Arial;font-size:10pt;">The Fund concentrates its investments (invests more than 25% of its net assets) in securities of </span><span style="font-family:Arial;font-size:10pt;">one or more of the following industries: real estate, energy, natural resources, and infrastructure.</span>
Risk [Heading]	rr_RiskHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Principal Risks</span>
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	The value of your investment in the Fund changes with the value of the Fund’s investments. Many factors affect that value, and it is possible to lose money by investing in the Fund. 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 government agency. The principal risks of investing in the Fund are listed below in alphabetical order and not in order of significance.Asset Allocation Risk.  A fund’s selection and weighting of asset classes and allocation among sub-advisors may cause it to underperform other funds with a similar investment objective.Bank Loans Risk.  Changes in economic conditions are likely to cause issuers of bank loans (also known as senior floating rate interests) to be unable to meet their obligations. In addition, the value of the collateral securing the loan (if any) may decline, causing a loan to be substantially unsecured. Underlying credit agreements governing the bank loans, reliance on market makers, priority of repayment, and overall market volatility may harm the liquidity of loans.Cayman Subsidiary Risk.  The Fund is subject to the particular risks associated with the investments of the Fund’s wholly-owned Cayman Subsidiary, namely commodity-related investments risk, counterparty risk, and derivatives risk. The Cayman Subsidiary is not registered under the Investment Company Act of 1940 and is not subject to all the investor protections of the Investment Company Act of 1940. The laws of the Cayman Islands and/or the United States (including the IRS position on income earned from wholly-owned subsidiaries described in past IRS private letter rulings) may change, resulting in the inability of the Fund and/or the Cayman Subsidiary to operate as described in this Prospectus.Commodity-Related Investments Risk.  The value of commodities investments will generally be affected by overall market movements and factors specific to a particular industry or commodity, which may include weather, embargoes, tariffs, and economic health, political, international, regulatory, and other developments. Exposure to the commodities markets may subject the Fund to greater volatility than investments in traditional securities.Counterparty Risk.  Counterparty risk is the risk that the counterparty to a contract or other obligation will be unable or unwilling to honor its obligations.Derivatives Risk.  Derivatives may not move in the direction anticipated by the portfolio manager. Transactions in derivatives may increase volatility, cause the liquidation of portfolio positions when not advantageous to do so, and result in disproportionate losses that may be substantially greater than a fund’s initial investment.•Forward Contracts, Futures, and Swaps.  Forward contracts, futures, and swaps involve specific risks, including: the imperfect correlation between the change in market value of the instruments held by the fund and the price of the forward contract, future, or swap; possible lack of a liquid secondary market for a forward contract, future, or swap and the resulting inability to close a forward contract, future, or swap when desired; counterparty risk; and if the fund has insufficient cash, it may have to sell securities from its portfolio to meet daily variation margin requirements.•Options.  Options involve specific risks, including: imperfect correlation between the change in market value of the instruments held by the Fund and the price of the options, counterparty risk, difference in trading hours for the options markets and the markets for the underlying securities (rate movements can take place in the underlying markets that cannot be reflected in the options markets), and an insufficient liquid secondary market for particular options.Energy Sector Risk.  The market value of securities in the energy sector may decline for many reasons, including, among others, changes in energy prices, energy supply and demand, government regulations, and energy conservation efforts. Energy companies can be significantly affected by the supply of, and demand for, specific products (e.g., oil and natural gas) and services, exploration and production spending, government subsidization and tax incentives, world events, and general economic conditions. In addition, renewable energy companies may be more volatile than companies operating in more established industries. Seasonal weather conditions, extreme weather, or other natural disasters could have a disproportionate effect on renewable energy companies versus other types of energy companies. These factors could impact the ability of renewable energy companies to pay dividends comparable to those paid by other types of energy companies.Equity Securities Risk.  A variety of factors can negatively impact the value of equity securities held by a fund, including a decline in the issuer’s financial condition, unfavorable performance of the issuer’s sector or industry, or changes in response to overall market and economic conditions. A fund’s principal market segment(s) (such as market capitalization or style) may underperform other market segments or the equity markets as a whole.•Growth Style Risk.  Growth investing entails the risk that if growth companies do not increase their earnings at a rate expected by investors, the market price of their stock may decline significantly, even if earnings show an absolute increase. Growth company stocks also typically lack the dividend yield that can lessen price declines in market downturns.•Smaller Companies Risk.  Investments in smaller companies may involve greater risk and price volatility than investments in larger, more mature companies. Smaller companies may have limited product lines, markets, or financial resources; lack the competitive strength of larger companies; have less experienced managers; or depend on a few key employees. Their securities often are less widely held and trade less frequently and in lesser quantities, and their market prices often fluctuate more, than securities of larger companies.•Value Style Risk.  Value investing entails the risk that value stocks may continue to be undervalued by the market for extended periods, including the entire period during which the stock is held by a fund, or the events that would cause the stock price to increase may not occur as anticipated or at all. Moreover, a stock that appears to be undervalued actually may be appropriately priced at a low level and, therefore, would not be profitable for the fund.Fixed-Income Securities Risk.  Fixed-income securities are subject to interest rate, credit quality, and liquidity risks. The market value of fixed-income securities generally declines when interest rates rise, and increased interest rates may adversely affect the liquidity of certain fixed-income securities. Moreover, an issuer of fixed-income securities could default on its payment obligations due to increased interest rates or for other reasons.Foreign Currency Risk.  Risks of investing in securities denominated in, or that trade in, foreign (non-U.S.) currencies include changes in foreign exchange rates and foreign exchange restrictions.Foreign Securities Risk.  The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation, or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies).High Yield Securities Risk.  High yield fixed-income securities (commonly referred to as “junk bonds”) are subject to greater credit quality risk than higher rated fixed-income securities and should be considered speculative.Industry Concentration Risk.  A fund that concentrates investments in a particular industry or group of industries has greater exposure than other funds to market, economic, and other factors affecting that industry or group of industries.•Energy/Natural Resources.  A fund concentrating in energy/natural resource companies may be affected by numerous factors, including events occurring in nature, inflationary pressures, international politics, the success of exploration projects, commodity prices, energy conservation and environmental concerns, rapid product development and/or product obsolescence due to technological advancements and changing consumer demand and societal trends, taxes, and other government regulations. In addition, interest rates and general economic conditions may affect the demand for energy/natural resources. For example, events occurring in nature (such as earthquakes or fires in prime energy/natural resource areas) and political events (such as coups, military confrontations, or acts of terrorism) can affect overall supply of energy/natural resources and the value of companies involved in energy/natural resources.•Infrastructure.  A fund concentrating in infrastructure-related assets is subject to numerous related risks, including the following: supply and demand for services from and access to infrastructure; operational and technical risks; government and political involvement, including changes in laws and regulations; environmental claims; changes in energy prices; natural disasters, terrorist events, and under-insured or uninsurable losses; and complex legal agreements and claims. Moreover, it may be difficult for the Fund to dispose of an infrastructure investment at an attractive price or at the appropriate time or in response to changing market conditions, or the Fund may otherwise be unable to complete a favorable exit strategy.•Real Estate.  A fund concentrating in the real estate industry is subject to the risks associated with direct ownership of real estate, securities of companies in the real estate industry, and/or real estate investment trusts.Leverage Risk.  Leverage created by borrowing or certain types of transactions or investments may impair the fund’s liquidity, cause it to liquidate positions at an unfavorable time, increase volatility of the fund’s net asset value, or diminish the fund’s performance.Portfolio Duration Risk.  Portfolio duration is a measure of the expected life of a fixed-income security and its sensitivity to changes in interest rates. The longer a fund’s average portfolio duration, the more sensitive the fund will be to changes in interest rates, which means funds with longer average portfolio durations may be more volatile than those with shorter durations.Real Estate Investment Trusts (“REITs”) Risk.  In addition to risks associated with investing in real estate securities, REITs are dependent upon management skills, are not diversified, and are subject to heavy cash flow dependency, risks of default by borrowers, and self-liquidation. Investment in REITs also involves risks similar to risks of investing in small market capitalization companies, such as limited financial resources, less frequent and limited volume trading, and may be subject to more abrupt or erratic price movements than larger company securities. A REIT could fail to qualify for tax-free pass-through of income under the Internal Revenue Code. Fund shareholders will indirectly bear their proportionate share of the expenses of REITs in which the fund invests.Real Estate Securities Risk.  Investing in real estate securities subjects the fund to the risks associated with the real estate market (which are similar to the risks associated with direct ownership in real estate), including declines in real estate values, loss due to casualty or condemnation, property taxes, interest rate changes, increased expenses, cash flow of underlying real estate assets, regulatory changes (including zoning, land use, and rents), and environmental problems, as well as to the risks related to the management skill and creditworthiness of the issuer.Redemption and Large Transaction Risk.  Ownership of the Fund’s shares may be concentrated in one or a few large investors (such as funds of funds, institutional investors, and asset allocation programs) that may redeem or purchase shares in large quantities. These transactions may cause the Fund to sell securities to meet redemptions or to invest additional cash at times it would not otherwise do so, which may result in increased transaction costs, increased expenses, changes to expense ratios, and adverse effects to Fund performance. Such transactions may also accelerate the realization of taxable income if sales of portfolio securities result in gains. Moreover, reallocations by large shareholders among share classes of a fund may result in changes to the expense ratios of affected classes, which may increase the expenses paid by shareholders of the class that experienced the redemption.U.S. Government Securities Risk.  Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities.Utilities Sector Risk.  Companies in the utilities sector are sensitive to changes in interest rates and other economic conditions, government regulation, uncertainties created by deregulation, environmental protection or energy conservation policies and practices, the level and demand for services, and the cost and delay of technological developments. In addition, securities of utility companies are volatile and may underperform in a sluggish economy.
Risk Lose Money [Text]	rr_RiskLoseMoney	<span style="color:#000000;font-family:Arial;font-size:10pt;">Many factors affect that value, and it is possible to lose money by investing in the Fund.</span>
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	<span style="color:#000000;font-family:Arial;font-size:10pt;"> An investment in the Fund is not a deposit of a bank and is not </span><span style="color:#000000;font-family:Arial;font-size:10pt;">insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</span>
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Performance</span>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following information provides some indication of the risks of investing in the Fund. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. You may get updated performance information at www.PrincipalAM.com.The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 years (or, if shorter, the life of the Fund). These annual returns do not reflect sales charges on Class A shares; if they did, results would be lower. The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.For periods prior to the inception date of Class R-6 shares (December 31, 2014), and Classes R-3 and R-5 shares (March 29, 2016), the performance shown in the table for these newer classes is that of the Fund’s Institutional Class shares, adjusted to reflect the respective fees and expenses of each class. However, where this adjustment for fees and expenses results in performance for a newer class that is higher than the historical performance of the Institutional Class shares, the historical performance of the Institutional Class shares is used. These adjustments result in performance for such periods that is no higher than the historical performance of the Institutional Class shares, which were first sold March 16, 2010.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	<span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:0%;">The bar chart shows the investment returns of the Fund’s Class A shares for each full calendar year of operations for 10 </span><span style="color:#000000;font-family:Arial;font-size:10pt;">years (or, if shorter, the life of the Fund). </span><span style="color:#000000;font-family:Arial;font-size:10pt;">These annual returns do not reflect sales charges on Class A shares; if they did, </span><span style="color:#000000;font-family:Arial;font-size:10pt;">results would be lower.</span><span style="color:#000000;font-family:Arial;font-size:10pt;"> The table shows for the last one, five, and ten calendar year periods (or, if shorter, the life of the </span><span style="color:#000000;font-family:Arial;font-size:10pt;">Fund), how the Fund’s average annual total returns compare with those of one or more broad measures of market performance.</span>
Performance Additional Market Index [Text]	rr_PerformanceAdditionalMarketIndex	<span style="font-family:Arial;font-size:10pt;margin-left:0%;">Performance of a blended index shows how the Fund’s performance compares to a blend of indices with similar investment </span><span style="font-family:Arial;font-size:10pt;">objectives. Performance of the components of the blended index are also shown. The weightings of the Diversified Real Asset Strategic Index are as follows:</span><span style="font-family:Arial;font-size:8pt;position:relative;top:-1pt;">•</span><span style="font-family:Arial;font-size:10pt;">for periods from January 1, 2022 and after, the Diversified Real Asset Strategic Index will be known as the Diversified Real Asset Index (Linked): 30% S&P Global Infrastructure Index NTR, 25% FTSE EPRA/NAREIT Developed Markets Index NTR, 15% Bloomberg U.S. Treasury TIPS Index, 15% Bloomberg Commodity Index, and 15% S&P Global Natural Resources Index NTR.</span><span style="font-family:Arial;font-size:8pt;position:relative;top:-1pt;">•</span><span style="font-family:Arial;font-size:10pt;">for periods prior to January 1,</span><span style="font-family:Arial;font-size:10pt;line-height:12pt;"> </span><span style="font-family:Arial;font-size:10pt;">2022: 35% Bloomberg U.S. Treasury TIPS Index, 20% S&P Global Infrastructure Index NTR, 20% S&P Global Natural Resources Index NTR, 15% Bloomberg Commodity Index, and 10% FTSE EPRA/NAREIT Developed Markets Index NTR. The blended index returns reflect the allocation described in the preceding sentence.</span>
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	<span style="font-family:Arial;font-size:10pt;">www.</span><span style="font-family:Arial;font-size:10pt;">PrincipalAM.com</span>
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	<span style="font-family:Arial;font-size:10pt;">Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.</span>
Bar Chart [Heading]	rr_BarChartHeading	<span style="font-family:Arial;font-size:10pt;font-weight:bold;">Total Returns as of December 31</span>
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	<span style="color:#000000;font-family:Arial;font-size:10pt;">These annual returns do not reflect sales charges on Class A shares; if they did, </span><span style="color:#000000;font-family:Arial;font-size:10pt;">results would be lower.</span>
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Highest return for a quarter during the period of the bar chart above:Q2 202011.09%Lowest return for a quarter during the period of the bar chart above:Q1 2020(19.62)%Year-to-date return for Class A shares:Q3 2022(13.02)%
Performance Table Heading	rr_PerformanceTableHeading	<span style="font-family:Arial;font-size:10pt;font-weight:bold;">Average Annual Total Returns</span> <br/><span style="font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0%;">For the periods ended December 31, </span><span style="font-family:Arial;font-size:10pt;font-weight:bold;">2021</span>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	<span style="color:#000000;font-family:Arial;font-size:10pt;margin-left:0%;">After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect </span><span style="color:#000000;font-family:Arial;font-size:10pt;">the impact of state and local taxes.</span>
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	<span style="color:#000000;font-family:Arial;font-size:10pt;"> Actual after-tax returns depend on an investor’s tax situation and may differ from those </span><span style="color:#000000;font-family:Arial;font-size:10pt;">shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.</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 are shown for Class A shares only </span><span style="color:#000000;font-family:Arial;font-size:10pt;">and would be different for the other share classes.</span>
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns are shown for Class A shares only and would be different for the other share classes.Performance of a blended index shows how the Fund’s performance compares to a blend of indices with similar investment objectives. Performance of the components of the blended index are also shown. The weightings of the Diversified Real Asset Strategic Index are as follows:•for periods from January 1, 2022 and after, the Diversified Real Asset Strategic Index will be known as the Diversified Real Asset Index (Linked): 30% S&P Global Infrastructure Index NTR, 25% FTSE EPRA/NAREIT Developed Markets Index NTR, 15% Bloomberg U.S. Treasury TIPS Index, 15% Bloomberg Commodity Index, and 15% S&P Global Natural Resources Index NTR.•for periods prior to January 1, 2022: 35% Bloomberg U.S. Treasury TIPS Index, 20% S&P Global Infrastructure Index NTR, 20% S&P Global Natural Resources Index NTR, 15% Bloomberg Commodity Index, and 10% FTSE EPRA/NAREIT Developed Markets Index NTR. The blended index returns reflect the allocation described in the preceding sentence.
Diversified Real Asset Fund | Class A
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.75%
Maximum Deferred Sales Charge (Load) (as a percentage of the offering price or NAV at the time Sales Load is paid, whichever is less)	rr_MaximumDeferredSalesChargeOverOther	1.00%
Management Fees	rr_ManagementFeesOverAssets	0.75%	[1]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.22%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.23%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)	[2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	1.21%
1 year	rr_ExpenseExampleYear01	$ 494
3 years	rr_ExpenseExampleYear03	749
5 years	rr_ExpenseExampleYear05	1,023
10 years	rr_ExpenseExampleYear10	$ 1,806
2012	rr_AnnualReturn2012	7.23%
2013	rr_AnnualReturn2013	4.96%
2014	rr_AnnualReturn2014	2.14%
2015	rr_AnnualReturn2015	(12.66%)
2016	rr_AnnualReturn2016	5.40%
2017	rr_AnnualReturn2017	9.69%
2018	rr_AnnualReturn2018	(8.22%)
2019	rr_AnnualReturn2019	14.66%
2020	rr_AnnualReturn2020	3.53%
2021	rr_AnnualReturn2021	16.95%
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 return for Class A shares:</span>
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2022
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(13.02%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Highest return for a quarter during the period of the bar chart above:</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	11.09%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="font-family:Arial;font-size:8pt;font-weight:bold;margin-left:0.0pt;">Lowest return for a quarter during the period of the bar chart above:</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2020
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(19.62%)
1 Year	rr_AverageAnnualReturnYear01	12.56%
5 Years	rr_AverageAnnualReturnYear05	6.11%
10 Years	rr_AverageAnnualReturnYear10	3.59%
Diversified Real Asset Fund | Institutional Class
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of the offering price or NAV at the time Sales Load is paid, whichever is less)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees	rr_ManagementFeesOverAssets	0.75%	[1]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets
Other Expenses	rr_OtherExpensesOverAssets	0.11%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.87%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.03%)	[2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	0.84%
1 year	rr_ExpenseExampleYear01	$ 86
3 years	rr_ExpenseExampleYear03	275
5 years	rr_ExpenseExampleYear05	479
10 years	rr_ExpenseExampleYear10	$ 1,070
1 Year	rr_AverageAnnualReturnYear01	17.34%
5 Years	rr_AverageAnnualReturnYear05	7.32%
10 Years	rr_AverageAnnualReturnYear10	4.38%
Diversified Real Asset Fund | Class R-3
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of the offering price or NAV at the time Sales Load is paid, whichever is less)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees	rr_ManagementFeesOverAssets	0.75%	[1]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.33%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.34%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets		[2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	1.34%
1 year	rr_ExpenseExampleYear01	$ 136
3 years	rr_ExpenseExampleYear03	425
5 years	rr_ExpenseExampleYear05	734
10 years	rr_ExpenseExampleYear10	$ 1,613
1 Year	rr_AverageAnnualReturnYear01	16.72%
5 Years	rr_AverageAnnualReturnYear05	6.76%
10 Years	rr_AverageAnnualReturnYear10	3.84%
Diversified Real Asset Fund | Class R-5
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of the offering price or NAV at the time Sales Load is paid, whichever is less)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees	rr_ManagementFeesOverAssets	0.75%	[1]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets
Other Expenses	rr_OtherExpensesOverAssets	0.27%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.03%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets		[2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	1.03%
1 year	rr_ExpenseExampleYear01	$ 105
3 years	rr_ExpenseExampleYear03	328
5 years	rr_ExpenseExampleYear05	569
10 years	rr_ExpenseExampleYear10	$ 1,259
1 Year	rr_AverageAnnualReturnYear01	17.15%
5 Years	rr_AverageAnnualReturnYear05	7.13%
10 Years	rr_AverageAnnualReturnYear10	4.18%
Diversified Real Asset Fund | Class R-6
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of the offering price or NAV at the time Sales Load is paid, whichever is less)	rr_MaximumDeferredSalesChargeOverOther	none
Management Fees	rr_ManagementFeesOverAssets	0.75%	[1]
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets
Other Expenses	rr_OtherExpensesOverAssets	0.02%
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	0.78%
Fee Waiver or Reimbursement	rr_FeeWaiverOrReimbursementOverAssets		[2]
Total Annual Fund Operating Expenses after Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	0.78%
1 year	rr_ExpenseExampleYear01	$ 80
3 years	rr_ExpenseExampleYear03	249
5 years	rr_ExpenseExampleYear05	433
10 years	rr_ExpenseExampleYear10	$ 966
1 Year	rr_AverageAnnualReturnYear01	17.42%
5 Years	rr_AverageAnnualReturnYear05	7.37%
10 Years	rr_AverageAnnualReturnYear10	4.40%
Diversified Real Asset Fund | Return After Taxes on Distributions | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	10.18%
5 Years	rr_AverageAnnualReturnYear05	5.19%
10 Years	rr_AverageAnnualReturnYear10	2.86%
Diversified Real Asset Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class A
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	7.81%
5 Years	rr_AverageAnnualReturnYear05	4.44%
10 Years	rr_AverageAnnualReturnYear10	2.57%
Diversified Real Asset Fund | Diversified Real Asset Strategic Index (except as noted for the below indexes, reflects no deduction for fees, expenses, or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	15.87%
5 Years	rr_AverageAnnualReturnYear05	6.82%
10 Years	rr_AverageAnnualReturnYear10	4.03%
Diversified Real Asset Fund | Bloomberg U.S. Treasury TIPS Index (reflects no deduction for fees, expenses, or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.96%
5 Years	rr_AverageAnnualReturnYear05	5.34%
10 Years	rr_AverageAnnualReturnYear10	3.09%
Diversified Real Asset Fund | S&P Global Infrastructure Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	27.13%
5 Years	rr_AverageAnnualReturnYear05	3.66%
10 Years	rr_AverageAnnualReturnYear10	(2.85%)
Diversified Real Asset Fund | S&P Global Natural Resources Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	26.11%
5 Years	rr_AverageAnnualReturnYear05	7.81%
10 Years	rr_AverageAnnualReturnYear10	8.64%
Diversified Real Asset Fund | Bloomberg Commodity Index (reflects no deduction for fees, expenses, or taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	11.05%
5 Years	rr_AverageAnnualReturnYear05	6.86%
10 Years	rr_AverageAnnualReturnYear10	6.81%
Diversified Real Asset Fund | FTSE EPRA/NAREIT Developed Markets Index NTR (reflects withholding taxes on foreign dividends, but no deduction for fees, expenses, or other taxes)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	24.42%
5 Years	rr_AverageAnnualReturnYear05	8.95%
10 Years	rr_AverageAnnualReturnYear10	3.94%

[1] Fees have been restated to reflect current fees.

[2] Principal Global Investors, LLC (“PGI”), the investment advisor, has contractually agreed to limit the Fund’s expenses by paying, if necessary, expenses normally payable by the Fund (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses) to maintain a total level of operating expenses (expressed as a percent of average net assets on an annualized basis) not to exceed 1.20% for Class A and 0.83% for Institutional Class shares. In addition, for Class R-6, the expense limit will maintain “Other Expenses” (expressed as a percent of average net assets on an annualized basis) not to exceed 0.02% (excluding interest expense, expenses related to fund investments, acquired fund fees and expenses, and tax reclaim recovery expenses and other extraordinary expenses). It is expected that the expense limits will continue through the period ending December 30, 2023; however, Principal Funds, Inc. and PGI, the parties to the agreement, may mutually agree to terminate the expense limits prior to the end of the period. Subject to applicable expense limits, the Fund may reimburse PGI for expenses incurred during the current fiscal year.