Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ING MUTUAL FUNDS
Prospectus Date	rr_ProspectusDate	Feb. 28, 2013
ING International Growth Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ING International Growth Fund
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks long-term growth of capital.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	These tables describe 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 you pay each year as a % of the value of your investment
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	March 1, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover % of average value of portfolio
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 transactions costs and may mean higher taxes if you are investing in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Expense Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 42% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	42.00%
Expense Example by Year [Heading]	rr_ExpenseExampleByYearHeading	Expense Example $
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Example is intended to help you compare the cost of investing in shares of the Fund with the costs of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated. The Example shows costs if you sold (redeemed) your shares at the end of the period or continued to hold them. The Example also assumes that your investment had 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:
Expense Example Closing [Text Block]	rr_ExpenseExampleClosingTextBlock	The Example reflects applicable expense limitation agreements and/or waivers in effect, if any, for the one-year period and the first year of the three-, five-, and ten-year periods.
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the Fund invests at least 65% of its total assets in common stocks and convertible securities of companies organized under the laws of, or with principal offices located in, a number of different countries outside of the United States, including companies in countries in emerging markets. The Fund does not focus its investments in a particular industry or country. The Fund may invest in companies of any market capitalization. The Fund may also invest in foreign issuers through depositary receipts or similar investment vehicles. The Fund may hold cash in U.S. dollars or foreign currencies. While the Fund invests primarily in common stocks, it may invest in other securities. The Fund may invest in derivative instruments including options, futures and forward foreign currency exchange contracts. The Fund may typically use derivatives to seek to reduce exposure to other risks, such as interest rate or currency risk, to substitute for taking a position in the underlying assets for cash management, and/or to seek to enhance returns in the Fund. The Fund invests a substantial amount of its assets in foreign investments which are denominated in currencies other than the U.S. dollar and can be affected by fluctuations in exchange rates. To attempt to protect against adverse changes in currency exchange rates, the Fund may, but will not necessarily use special techniques such as forward foreign currency exchange contracts. The Fund may invest in other investment companies, including exchange traded funds, to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”). Baillie Gifford Overseas Limited (“Baillie Gifford”) and T. Rowe Price Associates, Inc. (“T. Rowe Price”) (each a “Sub-Adviser” and collectively “Sub-Advisers”) provide day-to-day management of the Fund. The Sub-Advisers act independently of each other and use their own methodologies for selecting investments. ING Investments, LLC, the Fund’s investment adviser, will determine the amount of Fund assets allocated to Baillie Gifford and T. Rowe Price. Each Sub-Adviser may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into opportunities believed to be more promising, among others. The Fund may lend portfolio securities on a short-term or long-term basis, up to 331 / 3 % of its total assets. Baillie Gifford Overseas Limited In selecting investments for the Fund, Baillie Gifford normally takes into account the industry and country allocations in the MSCI - Europe, Australasia, and Far East® Index. A significant part of the assets will normally be divided among continental Europe, the United Kingdom, and Asia (including Australia and New Zealand). Country allocation, however, is driven by stock selection. Baillie Gifford invests in companies that it believes are well-managed, quality businesses that enjoy sustainable, competitive advantages in their marketplace. Baillie Gifford’s investment style primarily uses a bottom-up, stock-driven approach, with the objective of selecting stocks that it believes can sustain an above-average growth rate, which is not reflected in the share price. Companies are screened for quality first; valuation is a secondary consideration. Baillie Gifford looks for companies that it believes have attractive industry backgrounds, strong competitive positions within those industries, high-quality earnings, and a positive approach toward shareholders. The main fundamental factors that Baillie Gifford considers in this bottom-up analysis include earnings growth, cash flow growth, profitability, capital structure, and valuation. T. Rowe Price Associates, Inc. While T. Rowe Price invests with an awareness of the global economic backdrop and the outlook for industry sectors and individual countries, bottom-up stock selection is the focus of T. Rowe Price’s decision making. Country allocation is driven largely by stock selection, though we may limit investments in markets that appear to have poor overall prospects. Stock selection reflects a growth style. T. Rowe Price relies on a global team of investment analysts dedicated to in-depth fundamental research in an effort to identify companies it believes are capable of achieving and sustaining above-average, long-term earnings growth. T. Rowe Price seeks to purchase stocks of such companies at reasonable prices in relation to present or anticipated earnings, cash flow, or book value. In selecting investments, T. Rowe Price generally favors companies that it believes have one or more of the following characteristics: leading or improving market position; attractive business niche; attractive or improving franchise or industry position; seasoned management; stable or improving earnings and/or cash flow; and sound or improving balance sheet. T. Rowe Price typically focuses investments in large-sized, and to a lesser extent, medium-sized, companies.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	You could lose money on an investment in the Fund. Any of the following risks, among others, could affect Fund performance or cause the Fund to lose money or to underperform market averages of other funds. Company   The price of a given company’s stock could decline or underperform for many reasons including, among others, poor management, financial problems, or business challenges. If a company declares bankruptcy or becomes insolvent, its stock could become worthless. Convertible Securities   Convertible securities are securities that are convertible into or exercisable for common stocks at a stated price or rate. Convertible securities are subject to the usual risks associated with debt securities, such as interest rate and credit risk. In addition, because convertible securities react to changes in the value of the stocks into which they convert, they are subject to market risk. Credit   Prices of bonds and other debt instruments can fall if the issuer’s actual or perceived financial health deteriorates, whether because of broad economic or issuer-specific reasons. In certain cases, the issuer could be late in paying interest or principal, or could fail to pay altogether. Currency   To the extent that the Fund invests directly in foreign (non-U.S.) currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those (non-U.S.) currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged. Derivative Instruments   Derivative instruments are subject to a number of risks, including the risk of changes in the market price of the underlying securities, credit risk with respect to the counterparty, risk of loss due to changes in interest rates and liquidity risk. The use of certain derivatives may also have a leveraging effect which may increase the volatility of the Fund and reduce its returns. Foreign Investments/Developing and Emerging Markets Investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies due to: smaller markets; differing reporting, accounting, and auditing standards; nationalization, expropriation, or confiscatory taxation; foreign currency fluctuations, currency blockage, or replacement; potential for default on sovereign debt; or political changes or diplomatic developments. Foreign investment risks may be greater in developing and emerging markets than in developed markets. Growth Investing   Prices of growth stocks typically reflect high expectations for future company growth, and may fall quickly and significantly if investors suspect that actual growth may be less than expected. Growth companies typically lack any dividends that might cushion price declines. Growth stocks tend to be more volatile than value stocks, and may underperform the market as a whole over any given time period. Interest Rate   With bonds and other fixed rate debt instruments, a rise in interest rates generally causes values to fall; conversely, values generally rise as interest rates fall. The higher the credit quality of the instrument, and the longer its maturity or duration, the more sensitive it is likely to be to interest rate risk. In the case of inverse securities, the interest rate generally will decrease when the market rate of interest to which the inverse security is indexed decreases. Investment Model   The manager’s proprietary model may not adequately allow for existing or unforeseen market factors or the interplay between such factors. Liquidity   If a security is illiquid, the Fund might be unable to sell the security at a time when the Fund’s manager might wish to sell, and the security could have the effect of decreasing the overall level of the Fund’s liquidity. Further, the lack of an established secondary market may make it more difficult to value illiquid securities, which could vary from the amount the Fund could realize upon disposition. The Fund may make investments that become less liquid in response to market developments or adverse investor perception. The Fund could lose money if it cannot sell a security at the time and price that would be most beneficial to the Fund. Market   Stock prices may be volatile and are affected by the real or perceived impacts of such factors as economic conditions and political events. The stock market tends to be cyclical, with periods when stock prices generally rise and periods when stock prices generally decline. Any given stock market segment may remain out of favor with investors for a short or long period of time, and stocks as an asset class may underperform bonds or other asset classes during some periods. Market Capitalization   Stocks fall into three broad market capitalization categories - large, mid, and small. Investing primarily in one category carries the risk that, due to current market conditions, that category may be out of favor with investors. If valuations of large-capitalization companies appear to be greatly out of proportion to the valuations of mid- or small-capitalization companies, investors may migrate to the stocks of mid- and small-sized companies causing the Fund that invests in these companies to increase in value more rapidly than a fund that invests in larger, fully-valued companies. Investing in mid- and small-capitalization companies may be subject to special risks associated with narrower product lines, more limited financial resources, smaller management groups, and a more limited trading market for their stocks as compared with larger companies. As a result, stocks of mid- and small-capitalization companies may decline significantly in market downturns. Other Investment Companies   The main risk of investing in other investment companies, including exchange-traded funds, is the risk that the value of the securities underlying an investment company might decrease. Because the Fund may invest in other investment companies, you will pay a proportionate share of the expenses of those other investment companies (including management fees, administration fees, and custodial fees) in addition to the expenses of the Fund. Securities Lending   Securities lending involves two primary risks: “investment risk” and “borrower default risk.” Investment risk is the risk that the Fund will lose money from the investment of the cash collateral received from the borrower. Borrower default risk is the risk that the Fund will lose money due to the failure of a borrower to return a borrowed security in a timely manner. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.
Risk Lose Money [Text]	rr_RiskLoseMoney	You could lose money on an investment in the 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, the Federal Reserve Board or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	PERFORMANCE INFORMATION
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following information is intended to help you understand the risks of investing in the Fund. The following bar chart shows the Fund’s performance for the first full calendar year of operations and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period. The Fund’s performance information reflects applicable fee waivers and/or expense limitations in effect during the period presented. Absent such fee waivers/expense limitations, if any, performance would have been lower. The bar chart shows the performance of the Fund’s Class I shares. The Fund’s past performance (before and after taxes) is no guarantee of future results. For the most recent performance figures, go to www.INGFunds.com/literature or call 1-800-992-0180.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart shows the Fund’s performance for the first full calendar year of operations and the table compares the Fund’s performance to the performance of a broad-based securities market index/indices for the same period.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	1-800-992-0180
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.INGFunds.com/literature
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of future results.
Bar Chart [Heading]	rr_BarChartHeading	Calendar Year Total Returns Class I (as of December 31 of each year)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best quarter: 1st 2012, 13.75% and Worst quarter: 2nd 2012, (6.76)%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns% (for the periods ended December 31, 2012)
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	The index returns include the reinvestment of dividends and distributions net of withholding taxes, but do not reflect fees, brokerage commissions, or other expenses.
ING International Growth Fund | Class I
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) as a % of offering price	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge as a % of purchase or sales price, whichever is less	rr_MaximumDeferredSalesChargeOverOther	none
Management Fee	rr_ManagementFeesOverAssets	0.75%
Distribution and Service (12b-1) Fee	rr_DistributionAndService12b1FeesOverAssets	none
Administrative Services Fees	rr_Component1OtherExpensesOverAssets	0.10%
Other Expenses	rr_OtherExpensesOverAssets	0.17%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.02%
Waivers and Reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.03%)	[1]
Total Annual Fund Operating Expenses after Waivers and Reimbursements	rr_NetExpensesOverAssets	0.99%
1 Yr	rr_ExpenseExampleYear01	101
3 Yrs	rr_ExpenseExampleYear03	322
5 Yrs	rr_ExpenseExampleYear05	560
10 Yrs	rr_ExpenseExampleYear10	1,245
1 Yr	rr_ExpenseExampleNoRedemptionYear01	101
3 Yrs	rr_ExpenseExampleNoRedemptionYear03	322
5 Yrs	rr_ExpenseExampleNoRedemptionYear05	560
10 Yrs	rr_ExpenseExampleNoRedemptionYear10	1,245
2003	rr_AnnualReturn2003
2004	rr_AnnualReturn2004
2005	rr_AnnualReturn2005
2006	rr_AnnualReturn2006
2007	rr_AnnualReturn2007
2008	rr_AnnualReturn2008
2009	rr_AnnualReturn2009
2010	rr_AnnualReturn2010
2011	rr_AnnualReturn2011
2012	rr_AnnualReturn2012	20.37%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2012
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	13.75%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2012
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(6.76%)
1 Yr	rr_AverageAnnualReturnYear01	20.37%
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	2.76%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 06, 2011
ING International Growth Fund | After tax on distributions | Class I
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	20.18%
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	2.56%
ING International Growth Fund | After tax on distributions with sale | Class I
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	13.73%
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	2.41%
ING International Growth Fund | MSCI EAFE® Index
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	17.32%	[2]
5 Yrs	rr_AverageAnnualReturnYear05		[2]
10 Yrs	rr_AverageAnnualReturnYear10		[2]
since inception	rr_AverageAnnualReturnSinceInception	1.83%	[2]
ING International Growth Fund | MSCI ACW Index℠ Ex-U.S.
Risk/Return:	rr_RiskReturnAbstract
1 Yr	rr_AverageAnnualReturnYear01	16.83%
5 Yrs	rr_AverageAnnualReturnYear05
10 Yrs	rr_AverageAnnualReturnYear10
since inception	rr_AverageAnnualReturnSinceInception	0.62%

[1] The adviser is contractually obligated to limit expenses to 0.99% for Class I shares, through March 1, 2014; the obligation does not extend to interest, taxes, brokerage commissions, extraordinary expenses, and Acquired Fund Fees and Expenses. The obligation will automatically renew for one-year terms unless it is terminated by the Fund or the adviser upon written notice within 90 days of the end of the current term or upon termination of the advisory agreement and is subject to possible recoupment by the adviser within three years.

[2] The index returns include the reinvestment of dividends and distributions net of withholding taxes, but do not reflect fees, brokerage commissions, or other expenses.