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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName TRANSAMERICA FUNDS
Prospectus Date rr_ProspectusDate Mar. 01, 2020
Transamerica Core Bond  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Transamerica Core Bond
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks total return, consisting of current income and capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover:
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the fund’s performance.

During the most recent fiscal year, the portfolio turnover rate for the fund was 13% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 13.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example:
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 shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund’s sub-adviser, J.P. Morgan Investment Management Inc. (the “sub-adviser”), seeks to achieve the fund’s objective by investing, under normal circumstances, at least 80% of the fund’s net assets (plus the amount of borrowings, if any, for investment purposes) in bonds, including (without limitation):
  • U.S. government securities, including Treasury obligations and government sponsored enterprises such as Fannie Mae, Ginnie Mae, Freddie Mac and securities issued by other government agencies and instrumentalities
  • Medium- to high-quality corporate bonds
  • Mortgage-backed securities, including U.S. agency and non-agency pass through and collateralized mortgage obligations (“CMOs”)
  • Asset-backed securities
  • Commercial mortgage-backed securities (“CMBS”)
Generally, such bonds will have intermediate to long maturities.

To a lesser extent, the fund may invest in:
  • U.S. dollar-denominated foreign bonds
  • Short-term securities, including agency discount notes, commercial paper and money market funds
The fund may invest in bonds and other debt securities that are rated in the lowest investment grade category (commonly known as “junk” bonds). The fund’s average weighted maturity will ordinarily range between four and 12 years. The sub-adviser analyzes four major factors in managing and constructing the fund’s portfolio: duration, market sector, maturity concentrations and individual securities. The sub-adviser looks for market sectors and individual securities that it believes will perform well over time. The sub-adviser is value oriented and selects individual securities after performing a risk/reward analysis that includes an evaluation of interest rate risk, credit risk, and the complex legal and technical structure of the transaction. The fund may use futures contracts, options, swaps and other derivatives as tools in the management of fund assets. The fund may use derivatives as a substitute for various investments, to alter the investment characteristics of the fund, for risk management and/or to increase income or gain to the fund.
Risk [Heading] rr_RiskHeading Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Risk is inherent in all investing. Many factors and risks affect the fund's performance, including those described below. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly day to day and over time. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks (in alphabetical order after certain key risks) of investing in the fund. An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You may lose money if you invest in this fund.

Market – The market prices of the fund's securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as overall economic trends or events, government actions or interventions, market disruptions caused by trade disputes or other factors, political factors or adverse investor sentiment. The market prices of securities also may go down due to events or conditions that affect particular sectors, industries or issuers. Adverse market conditions may be prolonged and may not have the same impact on all types of securities. If the market prices of the securities owned by the fund fall, the value of your investment will go down. The fund may experience a substantial or complete loss on any individual security.

Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, terrorism, technology and data interruptions, natural disasters and other circumstances in one country or region could be highly disruptive to, and have profound impacts on, global economies or markets. During periods of market disruption, the fund's exposure to the risks described elsewhere in this summary will likely increase. As a result, whether or not the fund invests in securities of issuers located in or with significant exposure to the countries directly affected, the value and liquidity of the fund's investments may be negatively affected.

Fixed-Income Securities – Fixed-income securities are subject to risks including credit risk, interest rate risk, counterparty risk, prepayment risk, extension risk, valuation risk, and liquidity risk. The value of fixed-income securities may go up or down, sometimes rapidly and unpredictably, due to general market conditions, such as real or perceived adverse economic or political conditions, tariffs and trade disruptions, inflation, changes in interest rates, lack of liquidity in the bond markets or adverse investor sentiment. In addition, the value of a fixed-income security may decline if the issuer or other obligor of the security fails to pay principal and/or interest, otherwise defaults or has its credit rating downgraded or is perceived to be less creditworthy, or the credit quality or value of any underlying assets declines. If the value of fixed-income securities owned by the fund falls, the value of your investment will go down. The prices of fixed-income securities will generally go down when interest rates rise. Interest rates in the U.S. and certain foreign markets have been low relative to historic levels, so the fund faces a risk that interest rates may rise. A rise in rates tends to have a greater impact on the prices of longer term or duration securities.

Interest Rate – Interest rates in the U.S. and certain foreign markets have been low relative to historic levels. The fund faces a risk that interest rates may rise. The value of fixed income securities generally goes down when interest rates rise, and therefore the value of your investment in the fund may also go down. Debt securities have varying levels of sensitivity to changes in interest rates. A rise in rates tends to have a greater impact on the prices of longer term or duration securities. A significant or rapid rise in rates may result in losses. Changes in interest rates may affect the liquidity and value of the fund’s investments. A general rise in interest rates may cause investors to move out of fixed income securities on a large scale, which could adversely affect the price and liquidity of fixed income securities and could also result in increased redemptions from the fund. If the fund holds variable or floating rate securities, a decrease in interest rates will adversely affect the income received from such securities and the value of the fund’s shares.

Credit – If an issuer or other obligor (such as a party providing insurance or other credit enhancement) of a security held by the fund or a counterparty to a financial contract with the fund is unable or unwilling to meet its financial obligations or is downgraded, or is perceived to be less creditworthy, or if the value of any underlying assets declines, the value of your investment will typically decline. A decline may be significant, particularly in certain market environments. In addition, the fund may incur costs and may be hindered or delayed in enforcing its rights against an issuer, obligor or counterparty. The degree of credit risk of a security or financial contract depends upon, among other things, the financial condition of the issuer and the terms of the security or contract.

Mortgage-Related and Asset-Backed Securities – The value of mortgage-related and asset-backed securities will be influenced by factors affecting the housing market and the assets underlying such securities. As a result, during periods of declining asset values, difficult or frozen credit markets, swings in interest rates, or deteriorating economic conditions, mortgage-related and asset-backed securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid, which could negatively impact the fund. Mortgage-backed securities may be issued by private issuers, by government-sponsored entities such as Fannie Mae or Freddie Mac or by agencies of the U.S. government, such as Ginnie Mae. Mortgage-backed securities represent direct or indirect participations in, or are collateralized by and payable from, mortgage loans secured by real property. Unlike mortgage-related securities issued or guaranteed by agencies of the U.S. government or government-sponsored entities, mortgage-related securities issued by private issuers do not have a government or government-sponsored entity guarantee (but may have other credit enhancement), and may, and frequently do, have less favorable collateral, credit risk or other underwriting characteristics. Asset-backed securities represent participations in, or are secured by and payable from, assets such as installment sales or loan contracts, leases, credit card receivables and other categories of receivables. The value of mortgage-backed and asset-backed securities may be affected by changes in credit quality or value of the mortgage loans or other assets that support the securities. Mortgage-backed and asset-backed securities are subject to prepayment or call and extension risks. Some of these securities may receive little or no collateral protection from the underlying assets. The risk of default is generally higher in the case of mortgage-backed investments that include so-called “sub-prime” mortgages. The structure of some of these securities may be complex and there may be less information available than for other types of debt securities. Upon the occurrence of certain triggering events or defaults, the fund may become the holder of underlying assets at a time when those assets may be difficult to sell or may be sold only at a loss.

Liquidity – The fund may make investments that are illiquid or that become illiquid after purchase. Illiquid investments can be difficult to value, may trade at a discount from comparable, more liquid investments, and may be subject to wide fluctuations in value. As a general matter, a reduction in the willingness or ability of dealers and other institutional investors to make markets in fixed income securities may result in even less liquidity in certain markets. If the fund is forced to sell an illiquid investment to meet redemption requests or other cash needs, the fund may be forced to sell at a loss. The fund may not receive its proceeds from the sale of less liquid or illiquid securities for an extended period (for example, several weeks or even longer), and such sale may involve additional costs. Liquidity of particular investments, or even an entire market segment, can deteriorate rapidly, particularly during times of market turmoil, and those investments may be difficult or impossible for the fund to sell. This may prevent the fund from limiting losses.

Counterparty – The fund will be subject to the risk that the counterparties to derivatives, repurchase agreements and other financial contracts entered into by the fund or held by special purpose or structured vehicles in which the fund invests will not fulfill their contractual obligations. Adverse changes to counterparties (including derivatives exchanges and clearinghouses) may cause the value of financial contracts to go down. If a counterparty becomes bankrupt or otherwise fails to perform its obligations, the value of your investment in the fund may decline. In addition, the fund may incur costs and may be hindered or delayed in enforcing its rights against a counterparty.

Extension – When interest rates rise, repayments of fixed income securities, particularly asset- and mortgage-backed securities, may occur more slowly than anticipated, extending the effective duration of these fixed income securities at below market interest rates and causing their market prices to decline more than they would have declined due to the rise in interest rates alone. This may cause the fund’s share price to be more volatile or go down.

Prepayment or Call – Many issuers have a right to prepay their fixed income securities. Issuers may be more likely to prepay their securities if interest rates fall. If this happens, the fund will not benefit from the rise in the market price of the securities that normally accompanies a decline in interest rates and will be forced to reinvest prepayment proceeds at a time when yields on securities available in the market are lower than the yield on prepaid securities. The fund may also lose any premium it paid on prepaid securities.

Management – The value of your investment may go down if the investment manager’s or sub-adviser's judgments and decisions are incorrect or otherwise do not produce the desired results. You may also suffer losses if there are imperfections, errors or limitations in the quantitative, analytic or other tools, resources, information and data used, investment techniques applied, or the analyses employed or relied on, by the investment manager or sub-adviser, if such tools, resources, information or data are used incorrectly or otherwise do not work as intended, or if the investment manager’s or sub-adviser's investment style is out of favor or otherwise fails to produce the desired results. The fund’s investment strategies may not work as intended or otherwise fail to produce the desired results. Any of these things could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.

Active Trading – The fund may purchase and sell securities without regard to the length of time held. Active trading may have a negative impact on performance by increasing transaction costs and may generate greater amounts of net short-term capital gains, which, for shareholders holding shares in taxable accounts, would generally be subject to tax at ordinary income tax rates upon distribution. During periods of market volatility, active trading may be more pronounced.

Currency – The value of investments in securities denominated in foreign currencies increases or decreases as the rates of exchange between those currencies and the U.S. dollar change. U.S. dollar-denominated securities of foreign issuers may also be affected by currency risk, as the revenue earned by issuers of these securities may also be impacted by changes in the issuer’s local currency. Currency conversion costs and currency fluctuations could reduce or eliminate investment gains or add to investment losses. Currency exchange rates can be volatile and may fluctuate significantly over short periods of time, and are affected by factors such as general economic conditions, the actions of the U.S. and foreign governments or central banks, the imposition of currency controls, and speculation. A fund may be unable or may choose not to hedge its foreign currency exposure.

Derivatives – Derivatives involve special risks and costs and may result in losses to the fund. Using derivatives exposes the fund to additional or heightened risks, including leverage risk, liquidity risk, valuation risk, market risk, counterparty risk and credit risk. Their usage can increase fund losses and reduce opportunities for gains when market prices or volatility, interest rates, currencies, or the derivatives themselves, behave in a way not anticipated. Using derivatives may have a leveraging effect, increase fund volatility and not produce the result intended. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. Even a small investment in derivatives can have a disproportionate impact on the fund. Derivatives may be difficult to sell, unwind or value, and the counterparty (including, if applicable, the fund’s clearing broker, the derivatives exchange or the clearinghouse) may default on its obligations to the fund. In certain cases, the fund may incur costs and may be hindered or delayed in enforcing its rights against or closing out derivatives instruments with a counterparty, which may result in additional losses. Derivatives are subject to additional risks such as operational risk, including settlement issues, and legal risk, including that underlying documentation is incomplete or ambiguous. Derivatives are also generally subject to the risks applicable to the assets, rates, indices or other indicators underlying the derivative, including market risk, credit risk, liquidity risk, management and valuation risk. Also, suitable derivative transactions may not be available in all circumstances. The value of a derivative may fluctuate more or less than, or otherwise not correlate well with, the underlying assets, rates, indices or other indicators to which it relates. The fund may be required to segregate or earmark liquid assets or otherwise cover its obligations under derivatives transactions and may have to liquidate positions before it is desirable in order to meet these segregation and coverage requirements. Use of derivatives may have different tax consequences for the fund than an investment in the underlying assets or indices, and those differences may affect the amount, timing and character of income distributed to shareholders.

Foreign Investments – Investing in securities of foreign issuers or issuers with significant exposure to foreign markets involves additional risks. Foreign markets can be less liquid, less regulated, less transparent and more volatile than U.S. markets. The value of the fund’s foreign investments may decline because of factors affecting the particular issuer as well as foreign markets and issuers generally, such as unfavorable or unsuccessful government actions, reduction of government or central bank support, tariffs and trade disruptions, political or financial instability, social unrest or other adverse economic or political developments. Lack of information and weaker legal systems and accounting standards also may affect the value of these securities. Foreign investments may have lower liquidity and be more difficult to value than investments in U.S. issuers.

Investments by Affiliated Funds and Unaffiliated Funds – A significant portion of the fund’s shares may be owned by other funds sponsored by Transamerica and/or parties not affiliated with Transamerica. Transactions by these funds may be disruptive to the management of the fund. For example, the fund may experience large redemptions and could be required to sell securities at a time when it may not otherwise desire to do so. Such transactions may increase the fund’s brokerage and/or other transaction costs and could also accelerate the realization of taxable capital gains in the fund. In addition, sizeable redemptions could cause the fund’s total expenses to increase.

Leveraging – The value of your investment may be more volatile to the extent that the fund borrows or uses derivatives or other investments, such as ETFs, that have embedded leverage. Other risks also will be compounded because leverage generally magnifies the effect of a change in the value of an asset and creates a risk of loss of value on a larger pool of assets than the fund would otherwise have. The use of leverage is considered to be a speculative investment practice and may result in the loss of a substantial amount, and possibly all, of the fund's assets. The fund also may have to sell assets at inopportune times to satisfy its obligations or meet segregation or coverage requirements.

U.S. Government and Agency Obligations – Government agency obligations have different levels of credit support and, therefore, different degrees of credit risk. Securities issued by agencies and instrumentalities of the U.S. government that are supported by the full faith and credit of the U.S. government generally present a lesser degree of credit risk than securities issued by agencies and instrumentalities sponsored by the U.S. government that are supported only by the issuer’s right to borrow from the U.S. Treasury and securities issued by agencies and instrumentalities sponsored by the U.S. government that are supported only by the credit of the issuing agencies. A security backed by the “full faith and credit” of the U.S. government is guaranteed only as to its stated interest rate and face value at maturity, not its current market price.

Valuation – The sales price the fund could receive for any particular portfolio investment may differ from the fund's valuation of the investment, particularly for securities that trade in thin or volatile markets, that are priced based upon valuations provided by third-party pricing services that use matrix or evaluated pricing systems, or that are valued using a fair value methodology. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued securities or had used a different valuation methodology. The fund's ability to value its investments may be impacted by technological issues and/or errors by pricing services or other third party service providers.
Risk Lose Money [Text] rr_RiskLoseMoney You may lose money if you invest in this fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows how the fund’s average annual total returns for different periods compare to the returns of a broad measure of market performance.

As with all mutual funds, past performance (before and after taxes) is not a prediction of future results. Updated performance information is available on our website at www.transamerica.com/individual/products/mutual-funds/performance/ or by calling 1-888-233-4339.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows how the fund’s average annual total returns for different periods compare to the returns of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-233-4339
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.transamerica.com/individual/products/mutual-funds/performance/
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, past performance (before and after taxes) is not a prediction of future results.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns (calendar years ended December 31) - Class I2
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended Return
Best Quarter: 6/30/2010 3.40%
Worst Quarter: 12/31/2016 -3.02%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (periods ended December 31, 2019)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns are calculated using the historic highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The after-tax returns are calculated using the historic highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.
Transamerica Core Bond | I2  
Risk/Return: 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 purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.43%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.04%
Total annual fund operating expenses rr_ExpensesOverAssets 0.47%
1 year rr_ExpenseExampleYear01 $ 48
3 years rr_ExpenseExampleYear03 151
5 years rr_ExpenseExampleYear05 263
10 years rr_ExpenseExampleYear10 $ 591
2010 rr_AnnualReturn2010 6.52%
2011 rr_AnnualReturn2011 7.44%
2012 rr_AnnualReturn2012 5.33%
2013 rr_AnnualReturn2013 (1.90%)
2014 rr_AnnualReturn2014 5.88%
2015 rr_AnnualReturn2015 1.03%
2016 rr_AnnualReturn2016 2.33%
2017 rr_AnnualReturn2017 3.67%
2018 rr_AnnualReturn2018 0.13%
2019 rr_AnnualReturn2019 8.66%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2010
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.40%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.02%)
1 Year rr_AverageAnnualReturnYear01 8.66%
5 Years rr_AverageAnnualReturnYear05 3.12%
10 Years rr_AverageAnnualReturnYear10 3.86%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 01, 2009
Transamerica Core Bond | Return after taxes on distributions | I2  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 7.36%
5 Years rr_AverageAnnualReturnYear05 1.86%
10 Years rr_AverageAnnualReturnYear10 2.42%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 01, 2009
Transamerica Core Bond | Return after taxes on distributions and sale of fund shares | I2  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.11%
5 Years rr_AverageAnnualReturnYear05 1.81%
10 Years rr_AverageAnnualReturnYear10 2.39%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 01, 2009
Transamerica Core Bond | Bloomberg Barclays US Aggregate Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 8.72%
5 Years rr_AverageAnnualReturnYear05 3.05%
10 Years rr_AverageAnnualReturnYear10 3.75%