Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	Other
Document Period End Date	dei_DocumentPeriodEndDate	Oct. 31, 2011
Registrant Name	dei_EntityRegistrantName	ING MUTUAL FUNDS
Central Index Key	dei_EntityCentralIndexKey	0000895430
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Apr. 30, 2012
Document Effective Date	dei_DocumentEffectiveDate	Apr. 30, 2012
Prospectus Date	rr_ProspectusDate	Feb. 29, 2012
Supplement [Text Block]	ingmf_SupplementTextBlock	ING MUTUAL FUNDS ING Global Bond Fund (“Fund”) Supplement dated April 30, 2012 to the Fund’s Class A, Class B, Class C, Class I, Class O, Class R and Class W Prospectus (“Prospectus”) dated February 29, 2012 On March 8, 2012, the Board of Trustees of ING Mutual Funds approved a change with respect to the Fund’s investment strategies, effective April 30, 2012. 1. The section entitled “Principal Investment Strategies” of the summary section of the Fund’s Prospectus is hereby deleted in its entirety and replaced with the following due to the revision of the Fund’s principal investment strategies to allow for investment in bank loans: PRINCIPAL INVESTMENT STRATEGIES Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in bonds of issuers in a number of different countries, which may include the United States. The Fund will provide shareholders with at least 60 days’ prior written notice of any change in this investment policy. The Fund may invest in securities of issuers located in developed and emerging market countries. Securities may be denominated in foreign currencies or in the U.S. dollar. The Fund may hedge its exposure to securities denominated in foreign currencies. The Fund may also borrow money from banks and invest the proceeds of such loans in portfolio securities to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”). This investment technique is known as “leveraging.” The Fund invests primarily in investment-grade securities which include, but are not limited to, corporate and government bonds which, at the time of investment, are rated investment-grade (at least BBB- by Standard & Poor’s Ratings Services or Baa3 by Moody’s Investors Service, Inc.) or have an equivalent rating by a nationally recognized statistical rating organization, or are of comparable quality if unrated. The Fund may also invest in preferred stocks, money market instruments, municipal bonds, commercial and residential mortgage-related securities, asset-backed securities, other securitized and structured debt products, private placements, sovereign debt, and other investment companies. The Fund may also invest its assets in bank loans and in a combination of floating rate secured loans (“Senior Loans”) and shares of ING Prime Rate Trust, a closed-end investment company that invests in Senior Loans. Although the Fund may invest a portion of its assets in high-yield debt securities rated below investment-grade, the Fund will seek to maintain a minimum weighted average portfolio quality rating of at least investment-grade. The dollar-weighted average portfolio duration of the Fund will generally range between two and nine years. Duration is the most commonly used measure of risk in fixed-income investment as it incorporates multiple features of the fixed-income instrument (e.g., yield, coupon, maturity, etc.) into one number. Duration is a measure of sensitivity of the price of a fixed-income instrument to a change in interest rates. Duration is a weighted average of the times that interest payments and the final return of principal are received. The weights are the amounts of the payments discounted by the yield-to-maturity of the fixed-income instrument. Duration is expressed as a number of years. The bigger the duration number, the greater the interest-rate risk or reward for the fixed-income instrument prices. For example, the price of a bond fund with an average duration of five years would be expected to fall approximately 5% if interest rates rose by one percentage point. Conversely, the price of a bond fund with an average duration of five years would be expected to rise approximately 5% if interest rates drop by one percentage point. The Fund may use derivatives, including futures, swaps (including interest rate swaps, total return swaps, and credit default swaps), and options, among others, to seek to enhance return, to hedge some of the risks of its investments in fixed-income securities, or as a substitute for a position in an underlying asset. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls and reverse repurchase agreements). The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the 1940 Act. The investment process focuses on allocating assets among various sectors of the global bond markets and buying bonds at a discount to their intrinsic value. The sub-adviser (“Sub-Adviser”) utilizes proprietary quantitative techniques to identify bonds or sectors that are cheap relative to other bonds or sectors based on their historical price relationships. Teams of asset specialists use this relative value analysis to guide them in the security selection process. The Fund is non-diversified, which means it may invest a significant portion of its assets in a single issuer. The 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 33 1/3% of its total assets. PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE
ING Global Bond Fund
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	ingmf_SupplementTextBlock	ING MUTUAL FUNDS ING Global Bond Fund (“Fund”) Supplement dated April 30, 2012 to the Fund’s Class A, Class B, Class C, Class I, Class O, Class R and Class W Prospectus (“Prospectus”) dated February 29, 2012 On March 8, 2012, the Board of Trustees of ING Mutual Funds approved a change with respect to the Fund’s investment strategies, effective April 30, 2012. 1. The section entitled “Principal Investment Strategies” of the summary section of the Fund’s Prospectus is hereby deleted in its entirety and replaced with the following due to the revision of the Fund’s principal investment strategies to allow for investment in bank loans: PRINCIPAL INVESTMENT STRATEGIES Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in bonds of issuers in a number of different countries, which may include the United States. The Fund will provide shareholders with at least 60 days’ prior written notice of any change in this investment policy. The Fund may invest in securities of issuers located in developed and emerging market countries. Securities may be denominated in foreign currencies or in the U.S. dollar. The Fund may hedge its exposure to securities denominated in foreign currencies. The Fund may also borrow money from banks and invest the proceeds of such loans in portfolio securities to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”). This investment technique is known as “leveraging.” The Fund invests primarily in investment-grade securities which include, but are not limited to, corporate and government bonds which, at the time of investment, are rated investment-grade (at least BBB- by Standard & Poor’s Ratings Services or Baa3 by Moody’s Investors Service, Inc.) or have an equivalent rating by a nationally recognized statistical rating organization, or are of comparable quality if unrated. The Fund may also invest in preferred stocks, money market instruments, municipal bonds, commercial and residential mortgage-related securities, asset-backed securities, other securitized and structured debt products, private placements, sovereign debt, and other investment companies. The Fund may also invest its assets in bank loans and in a combination of floating rate secured loans (“Senior Loans”) and shares of ING Prime Rate Trust, a closed-end investment company that invests in Senior Loans. Although the Fund may invest a portion of its assets in high-yield debt securities rated below investment-grade, the Fund will seek to maintain a minimum weighted average portfolio quality rating of at least investment-grade. The dollar-weighted average portfolio duration of the Fund will generally range between two and nine years. Duration is the most commonly used measure of risk in fixed-income investment as it incorporates multiple features of the fixed-income instrument (e.g., yield, coupon, maturity, etc.) into one number. Duration is a measure of sensitivity of the price of a fixed-income instrument to a change in interest rates. Duration is a weighted average of the times that interest payments and the final return of principal are received. The weights are the amounts of the payments discounted by the yield-to-maturity of the fixed-income instrument. Duration is expressed as a number of years. The bigger the duration number, the greater the interest-rate risk or reward for the fixed-income instrument prices. For example, the price of a bond fund with an average duration of five years would be expected to fall approximately 5% if interest rates rose by one percentage point. Conversely, the price of a bond fund with an average duration of five years would be expected to rise approximately 5% if interest rates drop by one percentage point. The Fund may use derivatives, including futures, swaps (including interest rate swaps, total return swaps, and credit default swaps), and options, among others, to seek to enhance return, to hedge some of the risks of its investments in fixed-income securities, or as a substitute for a position in an underlying asset. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls and reverse repurchase agreements). The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the 1940 Act. The investment process focuses on allocating assets among various sectors of the global bond markets and buying bonds at a discount to their intrinsic value. The sub-adviser (“Sub-Adviser”) utilizes proprietary quantitative techniques to identify bonds or sectors that are cheap relative to other bonds or sectors based on their historical price relationships. Teams of asset specialists use this relative value analysis to guide them in the security selection process. The Fund is non-diversified, which means it may invest a significant portion of its assets in a single issuer. The 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 33 1/3% of its total assets. PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal market conditions, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in bonds of issuers in a number of different countries, which may include the United States. The Fund will provide shareholders with at least 60 days’ prior written notice of any change in this investment policy. The Fund may invest in securities of issuers located in developed and emerging market countries. Securities may be denominated in foreign currencies or in the U.S. dollar. The Fund may hedge its exposure to securities denominated in foreign currencies. The Fund may also borrow money from banks and invest the proceeds of such loans in portfolio securities to the extent permitted under the Investment Company Act of 1940, as amended, and the rules, regulations, and exemptive orders thereunder (“1940 Act”). This investment technique is known as “leveraging.” The Fund invests primarily in investment-grade securities which include, but are not limited to, corporate and government bonds which, at the time of investment, are rated investment-grade (at least BBB- by Standard & Poor’s Ratings Services or Baa3 by Moody’s Investors Service, Inc.) or have an equivalent rating by a nationally recognized statistical rating organization, or are of comparable quality if unrated. The Fund may also invest in preferred stocks, money market instruments, municipal bonds, commercial and residential mortgage-related securities, asset-backed securities, other securitized and structured debt products, private placements, sovereign debt, and other investment companies. The Fund may also invest its assets in bank loans and in a combination of floating rate secured loans (“Senior Loans”) and shares of ING Prime Rate Trust, a closed-end investment company that invests in Senior Loans. Although the Fund may invest a portion of its assets in high-yield debt securities rated below investment-grade, the Fund will seek to maintain a minimum weighted average portfolio quality rating of at least investment-grade. The dollar-weighted average portfolio duration of the Fund will generally range between two and nine years. Duration is the most commonly used measure of risk in fixed-income investment as it incorporates multiple features of the fixed-income instrument (e.g., yield, coupon, maturity, etc.) into one number. Duration is a measure of sensitivity of the price of a fixed-income instrument to a change in interest rates. Duration is a weighted average of the times that interest payments and the final return of principal are received. The weights are the amounts of the payments discounted by the yield-to-maturity of the fixed-income instrument. Duration is expressed as a number of years. The bigger the duration number, the greater the interest-rate risk or reward for the fixed-income instrument prices. For example, the price of a bond fund with an average duration of five years would be expected to fall approximately 5% if interest rates rose by one percentage point. Conversely, the price of a bond fund with an average duration of five years would be expected to rise approximately 5% if interest rates drop by one percentage point. The Fund may use derivatives, including futures, swaps (including interest rate swaps, total return swaps, and credit default swaps), and options, among others, to seek to enhance return, to hedge some of the risks of its investments in fixed-income securities, or as a substitute for a position in an underlying asset. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls and reverse repurchase agreements). The Fund may invest in other investment companies, including exchange-traded funds, to the extent permitted under the 1940 Act. The investment process focuses on allocating assets among various sectors of the global bond markets and buying bonds at a discount to their intrinsic value. The sub-adviser (“Sub-Adviser”) utilizes proprietary quantitative techniques to identify bonds or sectors that are cheap relative to other bonds or sectors based on their historical price relationships. Teams of asset specialists use this relative value analysis to guide them in the security selection process. The Fund is non-diversified, which means it may invest a significant portion of its assets in a single issuer. The 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 33 1/3% of its total assets.