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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName Voya MUTUAL FUNDS
Prospectus Date rr_ProspectusDate Feb. 27, 2015
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Diversified Emerging Markets Debt Fund
Class   A C I W
Management Fees2 % 0.80 0.80 0.80 0.80
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 None None
Other Expenses % 9.17 9.17 8.97 9.17
Acquired Fund Fees and Expenses % 0.09 0.09 0.09 0.09
Total Annual Fund Operating Expenses3 % 10.31 11.06 9.86 10.06
Waivers and Reimbursements4 % (9.06) (9.06) (8.91) (9.06)
Total Annual Fund Operating Expenses After Waivers and Reimbursements % 1.25 2.00 0.95 1.00
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.70% and the portion of the management fee attributable to the administrative services is 0.10%.
3 Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
4 The adviser is contractually obligated to limit expenses to 1.25%, 2.00%, 0.95%, and 1.00% for Class A, Class C, Class I, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, and extraordinary expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Voya Diversified International Fund
Class   A B C I
Management Fees2 % 0.15 0.15 0.15 0.15
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None
Other Expenses % 0.35 0.35 0.35 0.30
Acquired Fund Fees and Expenses % 0.91 0.91 0.91 0.91
Total Annual Fund Operating Expenses3 % 1.66 2.41 2.41 1.36
Waivers and Reimbursements4 % (0.26) (0.26) (0.26) (0.21)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.40 2.15 2.15 1.15
    
Class   O R W
Management Fees2 % 0.15 0.15 0.15
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 0.50 None
Other Expenses % 0.35 0.35 0.35
Acquired Fund Fees and Expenses % 0.91 0.91 0.91
Total Annual Fund Operating Expenses3 % 1.66 1.91 1.41
Waivers and Reimbursements4 % (0.26) (0.26) (0.26)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.40 1.65 1.15
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The Fund’s Management Fee structure is a “bifurcated fee” structure as follows: an annual rate of 0.10% of the Fund’s average daily net assets invested in Underlying Funds within the Voya family of funds; and 0.40% of the Fund’s average daily net assets invested in direct investments, which include, but are not limited to, a security issued by an investment company that is not part of the Voya family of funds, including exchange-traded funds, a security issued by a non-mutual fund issuer, such as an operating company, and derivative instruments. The portion of the management fee attributable to the advisory services is 0.05% and the portion of the management fee attributable to the administrative services is 0.10%.
3 Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
4 The adviser is contractually obligated to limit expenses to 1.58%, 2.33%, 2.33%, 1.33%, 1.58%, 1.83%, and 1.33% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares, respectively, through March 1, 2018. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to further limit expenses to 1.40%, 2.15%, 2.15%, 1.15%, 1.40%, 1.65%, and 1.15% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, and extraordinary expenses. Termination or modification of these obligations requires approval by the Fund’s board.
Voya Emerging Markets Equity Dividend Fund
Class   A B C I O W
Management Fees2 % 1.10 1.10 1.10 1.10 1.10 1.10
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None 0.25 None
Other Expenses % 1.15 1.15 1.15 1.05 1.15 1.15
Total Annual Fund Operating Expenses % 2.50 3.25 3.25 2.15 2.50 2.25
Waivers and Reimbursements3 % (0.80) (0.80) (0.80) (0.70) (0.80) (0.80)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.70 2.45 2.45 1.45 1.70 1.45
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 1.00% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser is contractually obligated to limit expenses to 1.70%, 2.45%, 2.45%, 1.45%, 1.70%, and 1.45% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Voya Global Bond Fund
Class   A B C I
Management Fees3 % 0.50 0.50 0.50 0.50
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None
Other Expenses % 0.23 0.23 0.23 0.13
Total Annual Fund Operating Expenses % 0.98 1.73 1.73 0.63
Waivers and Reimbursements4 % (0.08) (0.08) (0.08) None
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 0.90 1.65 1.65 0.63
    
Class   O P2 R W
Management Fees3 % 0.50 0.50 0.50 0.50
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 None 0.50 None
Other Expenses % 0.23 0.13 0.23 0.23
Total Annual Fund Operating Expenses % 0.98 0.63 1.23 0.73
Waivers and Reimbursements4 % (0.08) (0.48) (0.08) (0.08)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 0.90 0.15 1.15 0.65
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 Based on Class A shares’ expenses adjusted for contractual differences.
3 The portion of the management fee attributable to the advisory services is 0.40% and the portion of the management fee attributable to the administrative services is 0.10%.
4 The adviser is contractually obligated to limit expenses to 0.90%, 1.65%, 1.65%, 0.65%, 0.90%, 0.15%, 1.15%, and 0.65% for Class A, Class B, Class C, Class I, Class O, Class P, Class R, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to waive its management fee for Class P shares through March 1, 2016. Termination or modification of these obligations requires approval by the Fund’s board.
   
Class R6
Management Fee1 0.50%
Distribution and/or Shareholder Services (12b-1) Fees None
Other Expenses 0.10%
Total Annual Fund Operating Expenses 0.60%
Waivers and Reimbursements2 None
Total Annual Fund Operating Expenses after Waivers and Reimbursements 0.60%
1 The portion of the management fee attributable to the advisory services is 0.40% and the portion of the management fee attributable to the administrative services is 0.10%.
2 The adviser is contractually obligated to limit expenses to 0.65% through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Voya Global Equity Dividend Fund
Class   A B C I O W
Management Fees2 % 0.80 0.80 0.80 0.80 0.80 0.80
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None 0.25 None
Other Expenses % 0.41 0.41 0.41 0.31 0.41 0.41
Total Annual Fund Operating Expenses % 1.46 2.21 2.21 1.11 1.46 1.21
Waivers and Reimbursements3 % (0.21) (0.21) (0.21) (0.11) (0.21) (0.21)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.25 2.00 2.00 1.00 1.25 1.00
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.70% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser is contractually obligated to limit expenses to 1.40%, 2.15%, 2.15%, 1.15%, 1.40%, and 1.15% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. The adviser is contractually obligated to further limit expenses to 1.25%, 2.00%, 2.00%, 1.00%, 1.25%, and 1.00% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. Termination or modification of these obligations requires approval by the Fund’s board.
Voya Global Perspectives Fund
Class   A C I R W
Management Fees2 % 0.20 0.20 0.20 0.20 0.20
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 None 0.50 None
Other Expenses % 0.66 0.66 0.76 0.66 0.66
Acquired Fund Fees and Expenses % 0.80 0.80 0.80 0.80 0.80
Total Annual Fund Operating Expenses3 % 1.91 2.66 1.76 2.16 1.66
Waivers and Reimbursements4 % (0.68) (0.68) (0.78) (0.68) (0.68)
Total Annual Fund Operating Expenses After Waivers and Reimbursements % 1.23 1.98 0.98 1.48 0.98
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.10% and the portion of the management fee attributable to the administrative services is 0.10%.
3 Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
4 The adviser is contractually obligated to limit expenses to 1.23%, 1.98%, 0.98%, 1.48%, and 0.98% for Class A, Class C, Class I, Class R, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, and extraordinary expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Voya Global Real Estate Fund
Class   A B C I
Management Fees2 % 0.81 0.81 0.81 0.81
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None
Other Expenses % 0.20 0.20 0.20 0.17
Total Annual Fund Operating Expenses % 1.26 2.01 2.01 0.98
Waivers and Reimbursements3 % None None None None
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.26 2.01 2.01 0.98
    
Class   O R W
Management Fees2 % 0.81 0.81 0.81
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 0.50 None
Other Expenses % 0.20 0.20 0.20
Total Annual Fund Operating Expenses % 1.26 1.51 1.01
Waivers and Reimbursements3 % None None None
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.26 1.51 1.01
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.71% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser is contractually obligated to limit expenses to 1.40%, 2.15%, 2.15%, 1.15%, 1.40%, 1.65%, and 1.15% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
   
Class R6
Management Fee1 0.81%
Distribution and/or Shareholder Services (12b-1) Fees None
Other Expenses2 0.06%
Total Annual Fund Operating Expenses 0.87%
Waivers and Reimbursements3 None
Total Annual Fund Operating Expenses after Waivers and Reimbursements 0.87%
1 The portion of the management fee attributable to the advisory services is 0.71% and the portion of the management fee attributable to the administrative services is 0.10%.
2 Other expenses are based on estimated amounts for the current fiscal year.
3 The adviser is contractually obligated to limit expenses to 1.10% for Class R6 shares through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Voya Global Value Advantage Fund
Class   A B C I W
Management Fees2 % 1.00 1.00 1.00 1.00 1.00
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None None
Other Expenses % 0.24 0.24 0.24 0.21 0.24
Total Annual Fund Operating Expenses % 1.49 2.24 2.24 1.21 1.24
Waivers and Reimbursements3 % (0.14) (0.14) (0.14) (0.11) (0.14)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.35 2.10 2.10 1.10 1.10
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.90% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser and distributor are contractually obligated to limit expenses to 1.35%, 2.10%, 2.10%, 1.10%, and 1.10% for Class A, Class B, Class C, Class I, and Class W shares, respectively, through March 1, 2017. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser and distributor within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Voya International  Core Fund
Class   I W
Management Fee1 % 0.85 0.85
Distribution and/or Shareholder Services (12b-1) Fees % None None
Other Expenses % 0.19 0.19
Acquired Fund Fees and Expenses % 0.01 0.01
Total Annual Fund Operating Expenses2 % 1.05 1.05
Waivers and Reimbursements3 % (0.09) (0.09)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 0.96 0.96
1 The portion of the management fee attributable to the advisory services is 0.75% and the portion of the management fee attributable to the administrative services is 0.10%.
2 Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Fund’s Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
3 The adviser is contractually obligated to limit expenses to 0.95% and 0.95% for Class I shares and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Voya International Real Estate Fund
Class   A B C I W
Management Fees2 % 1.03 1.03 1.03 1.03 1.03
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None None
Other Expenses % 0.14 0.14 0.14 0.09 0.14
Total Annual Fund Operating Expenses % 1.42 2.17 2.17 1.12 1.17
Waivers and Reimbursements3 % None None None None None
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.42 2.17 2.17 1.12 1.17
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.93% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser and sub-adviser are contractually obligated to limit expenses to 1.50%, 2.25%, 2.25%, 1.25%, and 1.25% for Class A, Class B, Class C, Class I, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser and sub-adviser within 36 months of the waiver or reimbursement. In addition, the adviser and sub-adviser are contractually obligated to further limit expenses whereby the sub-adviser will pay the incremental costs necessary to further limit expenses to 1.45%, 2.20%, 2.20%, 1.20%, and 1.20% for Class A, Class B, Class C, Class I, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. Termination or modification of these obligations requires approval by the Fund’s board.
Voya Multi-Manager Emerging Markets Equity Fund
Class   A B C I R W
Management Fee2 % 1.10 1.10 1.10 1.10 1.10 1.10
Distribution and/or Shareholder Services (12b-1) Fee % 0.25 1.00 1.00 None 0.50 None
Other Expenses % 0.48 0.48 0.48 0.20 0.48 0.48
Total Annual Fund Operating Expenses % 1.83 2.58 2.58 1.30 2.08 1.58
Waivers and Reimbursements3 % (0.23) (0.23) (0.23) (0.05) (0.23) (0.23)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.60 2.35 2.35 1.25 1.85 1.35
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 1.00% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser is contractually obligated to limit expenses to 1.60%, 2.35%, 2.35%, 1.35%, 1.85%, and 1.35% for Class A, Class B, Class C, Class I, Class R, and Class W shares, respectively, through March 1, 2016. In addition, the adviser is contractually obligated to further limit expenses of Class I shares to 1.25% through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. The limitations are subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of these obligations requires approval by the Fund’s board.
Voya Multi-Manager International Equity Fund
Class I
Management Fees1 0.85%
Distribution and/or Shareholder Services (12b-1) Fees None
Other Expenses 0.14%
Total Annual Fund Operating Expenses 0.99%
Waivers, Reimbursements and Recoupments2 (0.02)%
Total Annual Fund Operating Expenses after Waivers, Reimbursements and Recoupments 0.97%
1 The portion of the management fee attributable to the advisory services is 0.75% and the portion of the management fee attributable to the administrative services is 0.10%.
2 The adviser is contractually obligated to limit expenses to 0.99% for Class I shares, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. The adviser is contractually obligated to waive a portion of the management fee through March 1, 2016. The management fee waiver for the Fund is an estimated 0.02%. Termination or modification of these obligations requires approval by the Fund’s board.
Voya Multi-Manager International Small Cap Fund
Class   A B C I O W
Management Fees3 % 1.10 1.10 1.10 1.10 1.10 1.10
Distribution and/or Shareholder Services (12b-1) Fees % 0.35 1.00 1.00 None 0.25 None
Other Expenses % 0.33 0.33 0.33 0.22 0.33 0.33
Total Annual Fund Operating Expenses % 1.78 2.43 2.43 1.32 1.68 1.43
Waivers and Reimbursements4 % (0.04) (0.04) (0.04) (0.08) (0.04) (0.04)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.74 2.39 2.39 1.24 1.64 1.39
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 Expense information has been restated to reflect current contractual rates.
3 The portion of the management fee attributable to the advisory services is 1.00% and the portion of the management fee attributable to the administrative services is 0.10%.
4 The adviser is contractually obligated to limit expenses to 1.95%, 2.60%, 2.60%, 1.40%, 1.85%, and 1.60% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to further limit expenses to 1.75%, 2.40%, 2.40%, 1.25%, 1.65%, and 1.40% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2017. These limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. In addition, the adviser is contractually obligated to waive a portion of the management fee through March 1, 2016. The management fee waiver for the Fund is an estimated 0.02%. Effective March 2, 2015, the adviser is contractually obligated to further waive a portion of the management fee through March 1, 2017. The additional management fee waiver for the Fund is an estimated 0.01%. Termination or modification of these obligations requires approval by the Fund’s board.
Voya Russia Fund
Class   A I W
Management Fees2 % 1.35 1.35 1.35
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 None None
Other Expenses % 0.47 0.53 0.47
Total Annual Fund Operating Expenses % 2.07 1.88 1.82
Waivers and Reimbursements3 % (0.07) (0.13) (0.07)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 2.00 1.75 1.75
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 1.25% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser is contractually obligated to limit expenses to 2.15%, 1.90%, and 1.90% for Class A, Class I, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to further limit expenses to 2.00%, 1.75%, and 1.75% for Class A, Class I, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. Termination or modification of these obligations requires approval by the Fund’s board.
Voya Diversified Emerging Markets Debt Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Diversified Emerging Markets Debt Fund
Class   A C I W
Management Fees2 % 0.80 0.80 0.80 0.80
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 None None
Other Expenses % 9.17 9.17 8.97 9.17
Acquired Fund Fees and Expenses % 0.09 0.09 0.09 0.09
Total Annual Fund Operating Expenses3 % 10.31 11.06 9.86 10.06
Waivers and Reimbursements4 % (9.06) (9.06) (8.91) (9.06)
Total Annual Fund Operating Expenses After Waivers and Reimbursements % 1.25 2.00 0.95 1.00
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.70% and the portion of the management fee attributable to the administrative services is 0.10%.
3 Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
4 The adviser is contractually obligated to limit expenses to 1.25%, 2.00%, 0.95%, and 1.00% for Class A, Class C, Class I, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, and extraordinary expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
Voya Diversified Emerging Markets Debt Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119025Member		 [1]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119025Member
Other Expenses rr_OtherExpensesOverAssets 9.17%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119025Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.09%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119025Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 10.31%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119025Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (9.06%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119025Member		 [3]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.25%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119025Member
Voya Diversified Emerging Markets Debt Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119026Member		 [1]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119026Member
Other Expenses rr_OtherExpensesOverAssets 9.17%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119026Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.09%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119026Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 11.06%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119026Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (9.06%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119026Member		 [3]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.00%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119026Member
Voya Diversified Emerging Markets Debt Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119027Member		 [1]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 8.97%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119027Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.09%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119027Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 9.86%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119027Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (8.91%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119027Member		 [3]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.95%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119027Member
Voya Diversified Emerging Markets Debt Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119029Member		 [1]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 9.17%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119029Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.09%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119029Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 10.06%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119029Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (9.06%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119029Member		 [3]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.00%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000038556Member
/ rr_ProspectusShareClassAxis
= vmf_C000119029Member
Voya Diversified International Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Diversified International Fund
Class   A B C I
Management Fees2 % 0.15 0.15 0.15 0.15
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None
Other Expenses % 0.35 0.35 0.35 0.30
Acquired Fund Fees and Expenses % 0.91 0.91 0.91 0.91
Total Annual Fund Operating Expenses3 % 1.66 2.41 2.41 1.36
Waivers and Reimbursements4 % (0.26) (0.26) (0.26) (0.21)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.40 2.15 2.15 1.15
    
Class   O R W
Management Fees2 % 0.15 0.15 0.15
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 0.50 None
Other Expenses % 0.35 0.35 0.35
Acquired Fund Fees and Expenses % 0.91 0.91 0.91
Total Annual Fund Operating Expenses3 % 1.66 1.91 1.41
Waivers and Reimbursements4 % (0.26) (0.26) (0.26)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.40 1.65 1.15
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The Fund’s Management Fee structure is a “bifurcated fee” structure as follows: an annual rate of 0.10% of the Fund’s average daily net assets invested in Underlying Funds within the Voya family of funds; and 0.40% of the Fund’s average daily net assets invested in direct investments, which include, but are not limited to, a security issued by an investment company that is not part of the Voya family of funds, including exchange-traded funds, a security issued by a non-mutual fund issuer, such as an operating company, and derivative instruments. The portion of the management fee attributable to the advisory services is 0.05% and the portion of the management fee attributable to the administrative services is 0.10%.
3 Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
4 The adviser is contractually obligated to limit expenses to 1.58%, 2.33%, 2.33%, 1.33%, 1.58%, 1.83%, and 1.33% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares, respectively, through March 1, 2018. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to further limit expenses to 1.40%, 2.15%, 2.15%, 1.15%, 1.40%, 1.65%, and 1.15% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, and extraordinary expenses. Termination or modification of these obligations requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Fee Waiver or Reimbursement over Assets, Date of Termination Two vmf_FeeWaiverOrReimbursementOverAssetsDateOfTerminationTwo March 1, 2018
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
Voya Diversified International Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.15%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023300Member		 [4]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023300Member
Other Expenses rr_OtherExpensesOverAssets 0.35%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023300Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.91%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023300Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.66%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023300Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.26%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023300Member		 [5]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.40%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023300Member
Voya Diversified International Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.15%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023301Member		 [4]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023301Member
Other Expenses rr_OtherExpensesOverAssets 0.35%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023301Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.91%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023301Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.41%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023301Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.26%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023301Member		 [5]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.15%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023301Member
Voya Diversified International Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.15%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023302Member		 [4]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023302Member
Other Expenses rr_OtherExpensesOverAssets 0.35%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023302Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.91%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023302Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.41%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023302Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.26%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023302Member		 [5]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.15%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023302Member
Voya Diversified International Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.15%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023303Member		 [4]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.30%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023303Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.91%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023303Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.36%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023303Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.21%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023303Member		 [5]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.15%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000023303Member
Voya Diversified International Fund | Class O  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.15%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000067061Member		 [4]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000067061Member
Other Expenses rr_OtherExpensesOverAssets 0.35%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000067061Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.91%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000067061Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.66%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000067061Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.26%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000067061Member		 [5]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.40%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000067061Member
Voya Diversified International Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.15%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000037970Member		 [4]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000037970Member
Other Expenses rr_OtherExpensesOverAssets 0.35%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000037970Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.91%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000037970Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.91%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000037970Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.26%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000037970Member		 [5]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.65%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000037970Member
Voya Diversified International Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.15%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000059857Member		 [4]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.35%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000059857Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.91%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000059857Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.41%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000059857Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.26%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000059857Member		 [5]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.15%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008491Member
/ rr_ProspectusShareClassAxis
= vmf_C000059857Member
Voya Emerging Markets Equity Dividend Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Emerging Markets Equity Dividend Fund
Class   A B C I O W
Management Fees2 % 1.10 1.10 1.10 1.10 1.10 1.10
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None 0.25 None
Other Expenses % 1.15 1.15 1.15 1.05 1.15 1.15
Total Annual Fund Operating Expenses % 2.50 3.25 3.25 2.15 2.50 2.25
Waivers and Reimbursements3 % (0.80) (0.80) (0.80) (0.70) (0.80) (0.80)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.70 2.45 2.45 1.45 1.70 1.45
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 1.00% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser is contractually obligated to limit expenses to 1.70%, 2.45%, 2.45%, 1.45%, 1.70%, and 1.45% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Voya Emerging Markets Equity Dividend Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023411Domain		 [6]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023411Domain
Other Expenses rr_OtherExpensesOverAssets 1.15%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023411Domain
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.50%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023411Domain
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.80%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023411Domain		 [7]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.70%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023411Domain
Voya Emerging Markets Equity Dividend Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023412Member		 [6]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023412Member
Other Expenses rr_OtherExpensesOverAssets 1.15%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023412Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.25%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023412Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.80%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023412Member		 [7]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.45%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023412Member
Voya Emerging Markets Equity Dividend Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023413Member		 [6]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023413Member
Other Expenses rr_OtherExpensesOverAssets 1.15%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023413Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.25%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023413Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.80%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023413Member		 [7]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.45%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023413Member
Voya Emerging Markets Equity Dividend Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023414Member		 [6]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.05%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023414Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.15%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023414Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.70%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023414Member		 [7]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.45%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000023414Member
Voya Emerging Markets Equity Dividend Fund | Class O  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000067062Member		 [6]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000067062Member
Other Expenses rr_OtherExpensesOverAssets 1.15%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000067062Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.50%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000067062Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.80%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000067062Member		 [7]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.70%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000067062Member
Voya Emerging Markets Equity Dividend Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000105406Member		 [6]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.15%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000105406Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.25%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000105406Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.80%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000105406Member		 [7]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.45%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008528Member
/ rr_ProspectusShareClassAxis
= vmf_C000105406Member
Voya Global Equity Dividend Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Global Equity Dividend Fund
Class   A B C I O W
Management Fees2 % 0.80 0.80 0.80 0.80 0.80 0.80
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None 0.25 None
Other Expenses % 0.41 0.41 0.41 0.31 0.41 0.41
Total Annual Fund Operating Expenses % 1.46 2.21 2.21 1.11 1.46 1.21
Waivers and Reimbursements3 % (0.21) (0.21) (0.21) (0.11) (0.21) (0.21)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.25 2.00 2.00 1.00 1.25 1.00
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.70% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser is contractually obligated to limit expenses to 1.40%, 2.15%, 2.15%, 1.15%, 1.40%, and 1.15% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. The adviser is contractually obligated to further limit expenses to 1.25%, 2.00%, 2.00%, 1.00%, 1.25%, and 1.00% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. Termination or modification of these obligations requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Voya Global Equity Dividend Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023399Member		 [1]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023399Member
Other Expenses rr_OtherExpensesOverAssets 0.41%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023399Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.46%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023399Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.21%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023399Member		 [8]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.25%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023399Member
Voya Global Equity Dividend Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023400Member		 [1]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023400Member
Other Expenses rr_OtherExpensesOverAssets 0.41%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023400Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.21%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023400Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.21%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023400Member		 [8]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.00%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023400Member
Voya Global Equity Dividend Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023401Member		 [1]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023401Member
Other Expenses rr_OtherExpensesOverAssets 0.41%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023401Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.21%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023401Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.21%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023401Member		 [8]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.00%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023401Member
Voya Global Equity Dividend Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000053100Member		 [1]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.31%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000053100Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.11%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000053100Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000053100Member		 [8]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.00%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000053100Member
Voya Global Equity Dividend Fund | Class O  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023398Member		 [1]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023398Member
Other Expenses rr_OtherExpensesOverAssets 0.41%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023398Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.46%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023398Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.21%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023398Member		 [8]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.25%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000023398Member
Voya Global Equity Dividend Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.80%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000059860Member		 [1]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.41%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000059860Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.21%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000059860Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.21%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000059860Member		 [8]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.00%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008525Member
/ rr_ProspectusShareClassAxis
= vmf_C000059860Member
Voya Global Perspectives Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Global Perspectives Fund
Class   A C I R W
Management Fees2 % 0.20 0.20 0.20 0.20 0.20
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 None 0.50 None
Other Expenses % 0.66 0.66 0.76 0.66 0.66
Acquired Fund Fees and Expenses % 0.80 0.80 0.80 0.80 0.80
Total Annual Fund Operating Expenses3 % 1.91 2.66 1.76 2.16 1.66
Waivers and Reimbursements4 % (0.68) (0.68) (0.78) (0.68) (0.68)
Total Annual Fund Operating Expenses After Waivers and Reimbursements % 1.23 1.98 0.98 1.48 0.98
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.10% and the portion of the management fee attributable to the administrative services is 0.10%.
3 Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
4 The adviser is contractually obligated to limit expenses to 1.23%, 1.98%, 0.98%, 1.48%, and 0.98% for Class A, Class C, Class I, Class R, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, and extraordinary expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
Voya Global Perspectives Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125019Member		 [9]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125019Member
Other Expenses rr_OtherExpensesOverAssets 0.66%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125019Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.80%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125019Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.91%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125019Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.68%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125019Member		 [10]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.23%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125019Member
Voya Global Perspectives Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125020Member		 [9]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125020Member
Other Expenses rr_OtherExpensesOverAssets 0.66%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125020Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.80%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125020Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.66%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125020Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.68%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125020Member		 [10]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.98%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125020Member
Voya Global Perspectives Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125021Member		 [9]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.76%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125021Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.80%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125021Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.76%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125021Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.78%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125021Member		 [10]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.98%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125021Member
Voya Global Perspectives Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125022Member		 [9]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125022Member
Other Expenses rr_OtherExpensesOverAssets 0.66%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125022Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.80%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125022Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.16%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125022Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.68%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125022Member		 [10]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.48%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125022Member
Voya Global Perspectives Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.20%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125023Member		 [9]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.66%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125023Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.80%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125023Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.66%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125023Member		 [2]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.68%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125023Member		 [10]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.98%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000040223Member
/ rr_ProspectusShareClassAxis
= vmf_C000125023Member
Voya Global Value Advantage Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Global Value Advantage Fund
Class   A B C I W
Management Fees2 % 1.00 1.00 1.00 1.00 1.00
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None None
Other Expenses % 0.24 0.24 0.24 0.21 0.24
Total Annual Fund Operating Expenses % 1.49 2.24 2.24 1.21 1.24
Waivers and Reimbursements3 % (0.14) (0.14) (0.14) (0.11) (0.14)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.35 2.10 2.10 1.10 1.10
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.90% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser and distributor are contractually obligated to limit expenses to 1.35%, 2.10%, 2.10%, 1.10%, and 1.10% for Class A, Class B, Class C, Class I, and Class W shares, respectively, through March 1, 2017. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser and distributor within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2017
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Voya Global Value Advantage Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.00%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023406Member		 [11]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023406Member
Other Expenses rr_OtherExpensesOverAssets 0.24%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023406Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.49%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023406Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023406Member		 [12]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.35%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023406Member
Voya Global Value Advantage Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.00%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023407Member		 [11]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023407Member
Other Expenses rr_OtherExpensesOverAssets 0.24%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023407Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.24%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023407Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023407Member		 [12]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.10%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023407Member
Voya Global Value Advantage Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.00%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023408Member		 [11]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023408Member
Other Expenses rr_OtherExpensesOverAssets 0.24%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023408Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.24%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023408Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023408Member		 [12]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.10%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023408Member
Voya Global Value Advantage Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.00%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023409Member		 [11]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.21%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023409Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.21%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023409Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.11%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023409Member		 [12]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.10%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000023409Member
Voya Global Value Advantage Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.00%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000079029Member		 [11]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.24%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000079029Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.24%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000079029Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.14%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000079029Member		 [12]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.10%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008527Member
/ rr_ProspectusShareClassAxis
= vmf_C000079029Member
Voya International Core Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya International  Core Fund
Class   I W
Management Fee1 % 0.85 0.85
Distribution and/or Shareholder Services (12b-1) Fees % None None
Other Expenses % 0.19 0.19
Acquired Fund Fees and Expenses % 0.01 0.01
Total Annual Fund Operating Expenses2 % 1.05 1.05
Waivers and Reimbursements3 % (0.09) (0.09)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 0.96 0.96
1 The portion of the management fee attributable to the advisory services is 0.75% and the portion of the management fee attributable to the administrative services is 0.10%.
2 Total Annual Fund Operating Expenses may be higher than the Fund’s ratio of expenses to average net assets shown in the Fund’s Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
3 The adviser is contractually obligated to limit expenses to 0.95% and 0.95% for Class I shares and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses may be higher than the Fund's ratio of expenses to average net assets shown in the Fund's Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
Voya International Core Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.85%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000096638Member		 [13]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.19%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000096638Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000096638Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.05%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000096638Member		 [14]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000096638Member		 [15]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.96%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000096638Member
Voya International Core Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.85%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000119164Member		 [13]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.19%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000119164Member
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%rr_AcquiredFundFeesAndExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000119164Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.05%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000119164Member		 [14]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000119164Member		 [15]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.96%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000031148Member
/ rr_ProspectusShareClassAxis
= vmf_C000119164Member
Voya International Real Estate Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya International Real Estate Fund
Class   A B C I W
Management Fees2 % 1.03 1.03 1.03 1.03 1.03
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None None
Other Expenses % 0.14 0.14 0.14 0.09 0.14
Total Annual Fund Operating Expenses % 1.42 2.17 2.17 1.12 1.17
Waivers and Reimbursements3 % None None None None None
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.42 2.17 2.17 1.12 1.17
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.93% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser and sub-adviser are contractually obligated to limit expenses to 1.50%, 2.25%, 2.25%, 1.25%, and 1.25% for Class A, Class B, Class C, Class I, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser and sub-adviser within 36 months of the waiver or reimbursement. In addition, the adviser and sub-adviser are contractually obligated to further limit expenses whereby the sub-adviser will pay the incremental costs necessary to further limit expenses to 1.45%, 2.20%, 2.20%, 1.20%, and 1.20% for Class A, Class B, Class C, Class I, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. Termination or modification of these obligations requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Voya International Real Estate Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.03%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027746Member		 [16]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027746Member
Other Expenses rr_OtherExpensesOverAssets 0.14%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027746Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.42%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027746Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [17]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.42%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027746Member
Voya International Real Estate Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.03%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027747Member		 [16]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027747Member
Other Expenses rr_OtherExpensesOverAssets 0.14%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027747Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.17%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027747Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [17]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.17%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027747Member
Voya International Real Estate Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.03%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027748Member		 [16]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027748Member
Other Expenses rr_OtherExpensesOverAssets 0.14%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027748Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.17%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027748Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [17]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.17%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027748Member
Voya International Real Estate Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.03%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027749Member		 [16]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.09%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027749Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.12%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027749Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [17]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.12%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000027749Member
Voya International Real Estate Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.03%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000059863Member		 [16]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.14%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000059863Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.17%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000059863Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [17]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.17%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000010034Member
/ rr_ProspectusShareClassAxis
= vmf_C000059863Member
Voya Multi-Manager Emerging Markets Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Multi-Manager Emerging Markets Equity Fund
Class   A B C I R W
Management Fee2 % 1.10 1.10 1.10 1.10 1.10 1.10
Distribution and/or Shareholder Services (12b-1) Fee % 0.25 1.00 1.00 None 0.50 None
Other Expenses % 0.48 0.48 0.48 0.20 0.48 0.48
Total Annual Fund Operating Expenses % 1.83 2.58 2.58 1.30 2.08 1.58
Waivers and Reimbursements3 % (0.23) (0.23) (0.23) (0.05) (0.23) (0.23)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.60 2.35 2.35 1.25 1.85 1.35
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 1.00% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser is contractually obligated to limit expenses to 1.60%, 2.35%, 2.35%, 1.35%, 1.85%, and 1.35% for Class A, Class B, Class C, Class I, Class R, and Class W shares, respectively, through March 1, 2016. In addition, the adviser is contractually obligated to further limit expenses of Class I shares to 1.25% through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. The limitations are subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of these obligations requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Voya Multi-Manager Emerging Markets Equity Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107874Member		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107874Member
Other Expenses rr_OtherExpensesOverAssets 0.48%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107874Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.83%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107874Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.23%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107874Member		 [19]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.60%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107874Member
Voya Multi-Manager Emerging Markets Equity Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000110970Member		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000110970Member
Other Expenses rr_OtherExpensesOverAssets 0.48%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000110970Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.58%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000110970Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.23%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000110970Member		 [19]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.35%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000110970Member
Voya Multi-Manager Emerging Markets Equity Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107875Member		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107875Member
Other Expenses rr_OtherExpensesOverAssets 0.48%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107875Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.58%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107875Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.23%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107875Member		 [19]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.35%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107875Member
Voya Multi-Manager Emerging Markets Equity Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000105125Member		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.20%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000105125Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.30%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000105125Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.05%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000105125Member		 [19]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.25%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000105125Member
Voya Multi-Manager Emerging Markets Equity Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107876Member		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107876Member
Other Expenses rr_OtherExpensesOverAssets 0.48%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107876Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.08%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107876Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.23%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107876Member		 [19]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.85%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107876Member
Voya Multi-Manager Emerging Markets Equity Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107877Member		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.48%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107877Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.58%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107877Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.23%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107877Member		 [19]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.35%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000034101Member
/ rr_ProspectusShareClassAxis
= vmf_C000107877Member
Voya Multi-Manager International Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Multi-Manager International Equity Fund
Class I
Management Fees1 0.85%
Distribution and/or Shareholder Services (12b-1) Fees None
Other Expenses 0.14%
Total Annual Fund Operating Expenses 0.99%
Waivers, Reimbursements and Recoupments2 (0.02)%
Total Annual Fund Operating Expenses after Waivers, Reimbursements and Recoupments 0.97%
1 The portion of the management fee attributable to the advisory services is 0.75% and the portion of the management fee attributable to the administrative services is 0.10%.
2 The adviser is contractually obligated to limit expenses to 0.99% for Class I shares, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. The adviser is contractually obligated to waive a portion of the management fee through March 1, 2016. The management fee waiver for the Fund is an estimated 0.02%. Termination or modification of these obligations requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Voya Multi-Manager International Equity Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.85%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000030601Member
/ rr_ProspectusShareClassAxis
= vmf_C000094856Member		 [13]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.14%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000030601Member
/ rr_ProspectusShareClassAxis
= vmf_C000094856Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.99%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000030601Member
/ rr_ProspectusShareClassAxis
= vmf_C000094856Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.02%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000030601Member
/ rr_ProspectusShareClassAxis
= vmf_C000094856Member		 [20]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.97%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000030601Member
/ rr_ProspectusShareClassAxis
= vmf_C000094856Member
Voya Multi-Manager International Small Cap Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Multi-Manager International Small Cap Fund
Class   A B C I O W
Management Fees3 % 1.10 1.10 1.10 1.10 1.10 1.10
Distribution and/or Shareholder Services (12b-1) Fees % 0.35 1.00 1.00 None 0.25 None
Other Expenses % 0.33 0.33 0.33 0.22 0.33 0.33
Total Annual Fund Operating Expenses % 1.78 2.43 2.43 1.32 1.68 1.43
Waivers and Reimbursements4 % (0.04) (0.04) (0.04) (0.08) (0.04) (0.04)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.74 2.39 2.39 1.24 1.64 1.39
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 Expense information has been restated to reflect current contractual rates.
3 The portion of the management fee attributable to the advisory services is 1.00% and the portion of the management fee attributable to the administrative services is 0.10%.
4 The adviser is contractually obligated to limit expenses to 1.95%, 2.60%, 2.60%, 1.40%, 1.85%, and 1.60% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to further limit expenses to 1.75%, 2.40%, 2.40%, 1.25%, 1.65%, and 1.40% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2017. These limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. In addition, the adviser is contractually obligated to waive a portion of the management fee through March 1, 2016. The management fee waiver for the Fund is an estimated 0.02%. Effective March 2, 2015, the adviser is contractually obligated to further waive a portion of the management fee through March 1, 2017. The additional management fee waiver for the Fund is an estimated 0.01%. Termination or modification of these obligations requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Fee Waiver or Reimbursement over Assets, Date of Termination Two vmf_FeeWaiverOrReimbursementOverAssetsDateOfTerminationTwo March 1, 2017
Expense Footnotes [Text Block] rr_ExpenseFootnotesTextBlock Expense information has been restated to reflect current contractual rates.
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Expense information has been restated to reflect current contractual rates.
Voya Multi-Manager International Small Cap Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023423Member		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.35%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023423Member
Other Expenses rr_OtherExpensesOverAssets 0.33%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023423Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.78%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023423Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.04%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023423Member		 [21]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.74%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023423Member
Voya Multi-Manager International Small Cap Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023424Member		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023424Member
Other Expenses rr_OtherExpensesOverAssets 0.33%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023424Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.43%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023424Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.04%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023424Member		 [21]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.39%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023424Member
Voya Multi-Manager International Small Cap Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023425Member		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023425Member
Other Expenses rr_OtherExpensesOverAssets 0.33%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023425Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.43%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023425Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.04%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023425Member		 [21]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.39%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023425Member
Voya Multi-Manager International Small Cap Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023426Member		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.22%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023426Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.32%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023426Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.08%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023426Member		 [21]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.24%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000023426Member
Voya Multi-Manager International Small Cap Fund | Class O  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000067063Member		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000067063Member
Other Expenses rr_OtherExpensesOverAssets 0.33%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000067063Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.68%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000067063Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.04%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000067063Member		 [21]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.64%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000067063Member
Voya Multi-Manager International Small Cap Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.10%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000059862Domain		 [18]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.33%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000059862Domain
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.43%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000059862Domain
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.04%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000059862Domain		 [21]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.39%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008531Member
/ rr_ProspectusShareClassAxis
= vmf_C000059862Domain
Voya Russia Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Russia Fund
Class   A I W
Management Fees2 % 1.35 1.35 1.35
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 None None
Other Expenses % 0.47 0.53 0.47
Total Annual Fund Operating Expenses % 2.07 1.88 1.82
Waivers and Reimbursements3 % (0.07) (0.13) (0.07)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 2.00 1.75 1.75
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 1.25% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser is contractually obligated to limit expenses to 2.15%, 1.90%, and 1.90% for Class A, Class I, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to further limit expenses to 2.00%, 1.75%, and 1.75% for Class A, Class I, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. Termination or modification of these obligations requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Voya Russia Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.35%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000023392Member		 [22]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000023392Member
Other Expenses rr_OtherExpensesOverAssets 0.47%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000023392Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.07%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000023392Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.07%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000023392Member		 [23]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.00%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000023392Member
Voya Russia Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.35%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000081637Member		 [22]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.53%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000081637Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.88%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000081637Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.13%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000081637Member		 [23]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.75%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000081637Member
Voya Russia Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 1.35%rr_ManagementFeesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000105404Member		 [22]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.47%rr_OtherExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000105404Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.82%rr_ExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000105404Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.07%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000105404Member		 [23]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.75%rr_NetExpensesOverAssets
/ dei_LegalEntityAxis
= vmf_S000008523Member
/ rr_ProspectusShareClassAxis
= vmf_C000105404Member
Class A, B, C, I, O, P, R, W Shares | Voya Global Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Global Bond Fund
Class   A B C I
Management Fees3 % 0.50 0.50 0.50 0.50
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None
Other Expenses % 0.23 0.23 0.23 0.13
Total Annual Fund Operating Expenses % 0.98 1.73 1.73 0.63
Waivers and Reimbursements4 % (0.08) (0.08) (0.08) None
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 0.90 1.65 1.65 0.63
    
Class   O P2 R W
Management Fees3 % 0.50 0.50 0.50 0.50
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 None 0.50 None
Other Expenses % 0.23 0.13 0.23 0.23
Total Annual Fund Operating Expenses % 0.98 0.63 1.23 0.73
Waivers and Reimbursements4 % (0.08) (0.48) (0.08) (0.08)
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 0.90 0.15 1.15 0.65
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 Based on Class A shares’ expenses adjusted for contractual differences.
3 The portion of the management fee attributable to the advisory services is 0.40% and the portion of the management fee attributable to the administrative services is 0.10%.
4 The adviser is contractually obligated to limit expenses to 0.90%, 1.65%, 1.65%, 0.65%, 0.90%, 0.15%, 1.15%, and 0.65% for Class A, Class B, Class C, Class I, Class O, Class P, Class R, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to waive its management fee for Class P shares through March 1, 2016. Termination or modification of these obligations requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Class A, B, C, I, O, P, R, W Shares | Voya Global Bond Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034078Member		 [24]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034078Member
Other Expenses rr_OtherExpensesOverAssets 0.23%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034078Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.98%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034078Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.08%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034078Member		 [25]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.90%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034078Member
Class A, B, C, I, O, P, R, W Shares | Voya Global Bond Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034079Member		 [24]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034079Member
Other Expenses rr_OtherExpensesOverAssets 0.23%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034079Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.73%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034079Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.08%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034079Member		 [25]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.65%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034079Member
Class A, B, C, I, O, P, R, W Shares | Voya Global Bond Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034080Member		 [24]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034080Member
Other Expenses rr_OtherExpensesOverAssets 0.23%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034080Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.73%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034080Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.08%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034080Member		 [25]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.65%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034080Member
Class A, B, C, I, O, P, R, W Shares | Voya Global Bond Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034081Member		 [24]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.13%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034081Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.63%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034081Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [25]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.63%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000034081Member
Class A, B, C, I, O, P, R, W Shares | Voya Global Bond Fund | Class O  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000067064Member		 [24]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000067064Member
Other Expenses rr_OtherExpensesOverAssets 0.23%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000067064Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.98%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000067064Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.08%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000067064Member		 [25]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.90%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000067064Member
Class A, B, C, I, O, P, R, W Shares | Voya Global Bond Fund | Class P  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000121438Member		 [24],[26]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none [26]
Other Expenses rr_OtherExpensesOverAssets 0.13%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000121438Member		 [26]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.63%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000121438Member		 [26]
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.48%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000121438Member		 [25],[26]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.15%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000121438Member		 [26]
Class A, B, C, I, O, P, R, W Shares | Voya Global Bond Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000105408Member		 [24]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%rr_DistributionAndService12b1FeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000105408Member
Other Expenses rr_OtherExpensesOverAssets 0.23%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000105408Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.23%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000105408Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.08%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000105408Member		 [25]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.15%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000105408Member
Class A, B, C, I, O, P, R, W Shares | Voya Global Bond Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000079030Member		 [24]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.23%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000079030Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.73%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000079030Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.08%)rr_FeeWaiverOrReimbursementOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000079030Member		 [25]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.65%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassMember
/ dei_LegalEntityAxis
= vmf_S000012534Member
/ rr_ProspectusShareClassAxis
= vmf_C000079030Member
Class A, B, C, I, O, R, W Shares | Voya Global Real Estate Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Global Real Estate Fund
Class   A B C I
Management Fees2 % 0.81 0.81 0.81 0.81
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 1.00 1.00 None
Other Expenses % 0.20 0.20 0.20 0.17
Total Annual Fund Operating Expenses % 1.26 2.01 2.01 0.98
Waivers and Reimbursements3 % None None None None
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.26 2.01 2.01 0.98
    
Class   O R W
Management Fees2 % 0.81 0.81 0.81
Distribution and/or Shareholder Services (12b-1) Fees % 0.25 0.50 None
Other Expenses % 0.20 0.20 0.20
Total Annual Fund Operating Expenses % 1.26 1.51 1.01
Waivers and Reimbursements3 % None None None
Total Annual Fund Operating Expenses after Waivers and Reimbursements % 1.26 1.51 1.01
1 A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
2 The portion of the management fee attributable to the advisory services is 0.71% and the portion of the management fee attributable to the administrative services is 0.10%.
3 The adviser is contractually obligated to limit expenses to 1.40%, 2.15%, 2.15%, 1.15%, 1.40%, 1.65%, and 1.15% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge of 1.00% is assessed on certain redemptions of Class A shares made within 18 months after purchase where no initial sales charge was paid at the time of purchase as part of an investment of $1 million or more.
Class A, B, C, I, O, R, W Shares | Voya Global Real Estate Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.81%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023402Member		 [27]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023402Member
Other Expenses rr_OtherExpensesOverAssets 0.20%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023402Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.26%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023402Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [28]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.26%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023402Member
Class A, B, C, I, O, R, W Shares | Voya Global Real Estate Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.81%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023403Member		 [27]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023403Member
Other Expenses rr_OtherExpensesOverAssets 0.20%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023403Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.01%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023403Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [28]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.01%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023403Member
Class A, B, C, I, O, R, W Shares | Voya Global Real Estate Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.81%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023404Member		 [27]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%rr_DistributionAndService12b1FeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023404Member
Other Expenses rr_OtherExpensesOverAssets 0.20%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023404Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.01%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023404Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [28]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 2.01%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023404Member
Class A, B, C, I, O, R, W Shares | Voya Global Real Estate Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.81%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023405Member		 [27]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.17%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023405Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.98%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023405Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [28]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.98%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000023405Member
Class A, B, C, I, O, R, W Shares | Voya Global Real Estate Fund | Class O  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.81%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000034658Member		 [27]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%rr_DistributionAndService12b1FeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000034658Member
Other Expenses rr_OtherExpensesOverAssets 0.20%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000034658Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.26%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000034658Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [28]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.26%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000034658Member
Class A, B, C, I, O, R, W Shares | Voya Global Real Estate Fund | Class R  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.81%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000105405Member		 [27]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%rr_DistributionAndService12b1FeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000105405Member
Other Expenses rr_OtherExpensesOverAssets 0.20%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000105405Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.51%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000105405Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [28]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.51%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000105405Member
Class A, B, C, I, O, R, W Shares | Voya Global Real Estate Fund | Class W  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.81%rr_ManagementFeesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000059861Member		 [27]
Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.20%rr_OtherExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000059861Member
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.01%rr_ExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000059861Member
Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [28]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 1.01%rr_NetExpensesOverAssets
/ dei_DocumentInformationDocumentAxis
= vmf_ClassAbciorwSharesMember
/ dei_LegalEntityAxis
= vmf_S000008526Member
/ rr_ProspectusShareClassAxis
= vmf_C000059861Member
Class R6 Shares | Voya Global Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Global Bond Fund
Class R6
Management Fee1 0.50%
Distribution and/or Shareholder Services (12b-1) Fees None
Other Expenses 0.10%
Total Annual Fund Operating Expenses 0.60%
Waivers and Reimbursements2 None
Total Annual Fund Operating Expenses after Waivers and Reimbursements 0.60%
1 The portion of the management fee attributable to the advisory services is 0.40% and the portion of the management fee attributable to the administrative services is 0.10%.
2 The adviser is contractually obligated to limit expenses to 0.65% through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Class R6 Shares | Voya Global Bond Fund | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%rr_ManagementFeesOverAssets
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Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.10%rr_OtherExpensesOverAssets
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Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.60%rr_ExpensesOverAssets
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Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [29]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.60%rr_NetExpensesOverAssets
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Class R6 Shares | Voya Global Real Estate Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] vmf_SupplementTextBlock
Voya Mutual Funds (“Registrant”)
To each series of the Registrant (each a “Fund” and collectively the “Funds”)
Supplement dated May 12, 2015
To the Funds’ current prospectuses
(each a “Prospectus” and collectively the “Prospectuses”)
At a meeting held on March 12, 2015, the Registrant’s Board of Trustees approved amending and restating the Funds’ Investment Management Agreements so that, effective May 1, 2015, the terms of each Fund’s Investment Management Agreement and its Administration Agreement are combined under a single Amended and Restated Investment Management Agreement with a single management fee. The single management fee rate under each Fund’s Amended and Restated Investment Management Agreement does not exceed the former combined investment management and administrative services fee rates for the Fund and, under each Fund’s Amended and Restated Investment Management Agreement, there was no change to the investment management or administrative services provided or the fees charged to the Fund.
Each Fund’s Prospectus(es) are revised as follows:
1 The table and accompanying footnotes of the section entitled “Annual Fund Operating Expenses” in the summary section of each Fund‘s Prospectus(es) are deleted and replaced with the following:
Voya Global Real Estate Fund
Class R6
Management Fee1 0.81%
Distribution and/or Shareholder Services (12b-1) Fees None
Other Expenses2 0.06%
Total Annual Fund Operating Expenses 0.87%
Waivers and Reimbursements3 None
Total Annual Fund Operating Expenses after Waivers and Reimbursements 0.87%
1 The portion of the management fee attributable to the advisory services is 0.71% and the portion of the management fee attributable to the administrative services is 0.10%.
2 Other expenses are based on estimated amounts for the current fiscal year.
3 The adviser is contractually obligated to limit expenses to 1.10% for Class R6 shares through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund’s board.
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination March 1, 2016
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses are based on estimated amounts for the current fiscal year.
Class R6 Shares | Voya Global Real Estate Fund | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.81%rr_ManagementFeesOverAssets
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Distribution and/or Shareholder Services (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.06%rr_OtherExpensesOverAssets
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Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.87%rr_ExpensesOverAssets
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Waivers and Reimbursements rr_FeeWaiverOrReimbursementOverAssets none [31]
Total Annual Fund Operating Expenses After Waivers and Reimbursements rr_NetExpensesOverAssets 0.87%rr_NetExpensesOverAssets
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[1] The portion of the management fee attributable to the advisory services is 0.70% and the portion of the management fee attributable to the administrative services is 0.10%.
[2] Total Annual Fund Operating Expenses may be higher than the Fund's ratio of expenses to average net assets shown in the Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
[3] The adviser is contractually obligated to limit expenses to 1.25%, 2.00%, 0.95%, and 1.00% for Class A, Class C, Class I, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, and extraordinary expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund's board.
[4] The Fund's Management Fee structure is a "bifurcated fee" structure as follows: an annual rate of 0.10% of the Fund's average daily net assets invested in Underlying Funds within the Voya family of funds; and 0.40% of the Fund's average daily net assets invested in direct investments, which include, but are not limited to, a security issued by an investment company that is not part of the Voya family of funds, including exchange-traded funds, a security issued by a non-mutual fund issuer, such as an operating company, and derivative instruments. The portion of the management fee attributable to the advisory services is 0.05% and the portion of the management fee attributable to the administrative services is 0.10%.
[5] The adviser is contractually obligated to limit expenses to 1.58%, 2.33%, 2.33%, 1.33%, 1.58%, 1.83%, and 1.33% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares, respectively, through March 1, 2018. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to further limit expenses to 1.40%, 2.15%, 2.15%, 1.15%, 1.40%, 1.65%, and 1.15% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, and extraordinary expenses. Termination or modification of these obligations requires approval by the Fund's board.
[6] The portion of the management fee attributable to the advisory services is 1.00% and the portion of the management fee attributable to the administrative services is 0.10%.
[7] The adviser is contractually obligated to limit expenses to 1.70%, 2.45%, 2.45%, 1.45%, 1.70%, and 1.45% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund's board.
[8] The adviser is contractually obligated to limit expenses to 1.40%, 2.15%, 2.15%, 1.15%, 1.40%, and 1.15% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. The adviser is contractually obligated to further limit expenses to 1.25%, 2.00%, 2.00%, 1.00%, 1.25%, and 1.00% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. Termination or modification of these obligations requires approval by the Fund's board.
[9] The portion of the management fee attributable to the advisory services is 0.10% and the portion of the management fee attributable to the administrative services is 0.10%.
[10] The adviser is contractually obligated to limit expenses to 1.23%, 1.98%, 0.98%, 1.48%, and 0.98% for Class A, Class C, Class I, Class R, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, and extraordinary expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund's board.
[11] The portion of the management fee attributable to the advisory services is 0.90% and the portion of the management fee attributable to the administrative services is 0.10%.
[12] The adviser and distributor are contractually obligated to limit expenses to 1.35%, 2.10%, 2.10%, 1.10%, and 1.10% for Class A, Class B, Class C, Class I, and Class W shares, respectively, through March 1, 2017. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser and distributor within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund's board.
[13] The portion of the management fee attributable to the advisory services is 0.75% and the portion of the management fee attributable to the administrative services is 0.10%.
[14] Total Annual Fund Operating Expenses may be higher than the Fund's ratio of expenses to average net assets shown in the Fund's Financial Highlights, which reflects the operating expenses of the Fund and does not include Acquired Fund Fees and Expenses.
[15] The adviser is contractually obligated to limit expenses to 0.95% and 0.95% for Class I shares and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund's board.
[16] The portion of the management fee attributable to the advisory services is 0.93% and the portion of the management fee attributable to the administrative services is 0.10%.
[17] The adviser and sub-adviser are contractually obligated to limit expenses to 1.50%, 2.25%, 2.25%, 1.25%, and 1.25% for Class A, Class B, Class C, Class I, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser and sub-adviser within 36 months of the waiver or reimbursement. In addition, the adviser and sub-adviser are contractually obligated to further limit expenses whereby the sub-adviser will pay the incremental costs necessary to further limit expenses to 1.45%, 2.20%, 2.20%, 1.20%, and 1.20% for Class A, Class B, Class C, Class I, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. Termination or modification of these obligations requires approval by the Fund's board.
[18] The portion of the management fee attributable to the advisory services is 1.00% and the portion of the management fee attributable to the administrative services is 0.10%.
[19] The adviser is contractually obligated to limit expenses to 1.60%, 2.35%, 2.35%, 1.35%, 1.85%, and 1.35% for Class A, Class B, Class C, Class I, Class R, and Class W shares, respectively, through March 1, 2016. In addition, the adviser is contractually obligated to further limit expenses of Class I shares to 1.25% through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. The limitations are subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of these obligations requires approval by the Fund's board.
[20] The adviser is contractually obligated to limit expenses to 0.99% for Class I shares, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. The adviser is contractually obligated to waive a portion of the management fee through March 1, 2016. The management fee waiver for the Fund is an estimated 0.02%. Termination or modification of these obligations requires approval by the Fund's board.
[21] The adviser is contractually obligated to limit expenses to 1.95%, 2.60%, 2.60%, 1.40%, 1.85%, and 1.60% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to further limit expenses to 1.75%, 2.40%, 2.40%, 1.25%, 1.65%, and 1.40% for Class A, Class B, Class C, Class I, Class O, and Class W shares, respectively, through March 1, 2017. These limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. In addition, the adviser is contractually obligated to waive a portion of the management fee through March 1, 2016. The management fee waiver for the Fund is an estimated 0.02%. Effective March 2, 2015, the adviser is contractually obligated to further waive a portion of the management fee through March 1, 2017. The additional management fee waiver for the Fund is an estimated 0.01%. Termination or modification of these obligations requires approval by the Fund's board.
[22] The portion of the management fee attributable to the advisory services is 1.25% and the portion of the management fee attributable to the administrative services is 0.10%.
[23] The adviser is contractually obligated to limit expenses to 2.15%, 1.90%, and 1.90% for Class A, Class I, and Class W shares, respectively, through March 1, 2016. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to further limit expenses to 2.00%, 1.75%, and 1.75% for Class A, Class I, and Class W shares, respectively, through March 1, 2016. The limitations do not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. Termination or modification of these obligations requires approval by the Fund's board.
[24] The portion of the management fee attributable to the advisory services is 0.40% and the portion of the management fee attributable to the administrative services is 0.10%.
[25] The adviser is contractually obligated to limit expenses to 0.90%, 1.65%, 1.65%, 0.65%, 0.90%, 0.15%, 1.15%, and 0.65% for Class A, Class B, Class C, Class I, Class O, Class P, Class R, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. In addition, the adviser is contractually obligated to waive its management fee for Class P shares through March 1, 2016. Termination or modification of these obligations requires approval by the Fund's board.
[26] Based on Class A shares' expenses adjusted for contractual differences.
[27] The portion of the management fee attributable to the advisory services is 0.71% and the portion of the management fee attributable to the administrative services is 0.10%.
[28] The adviser is contractually obligated to limit expenses to 1.40%, 2.15%, 2.15%, 1.15%, 1.40%, 1.65%, and 1.15% for Class A, Class B, Class C, Class I, Class O, Class R, and Class W shares, respectively, through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund's board.
[29] The adviser is contractually obligated to limit expenses to 0.65% through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund's board.
[30] Other expenses are based on estimated amounts for the current fiscal year.
[31] The adviser is contractually obligated to limit expenses to 1.10% for Class R6 shares through March 1, 2016. The limitation does not extend to interest, taxes, investment-related costs, leverage expenses, extraordinary expenses, and Acquired Fund Fees and Expenses. This limitation is subject to possible recoupment by the adviser within 36 months of the waiver or reimbursement. Termination or modification of this obligation requires approval by the Fund's board.