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Label Element Value
MassMutual Core Bond Fund  
Prospectus [Line Items] oef_ProspectusLineItems  
Expense Heading [Optional Text] oef_ExpenseHeading Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Operating Expenses Caption [Optional Text] oef_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination oef_FeeWaiverOrReimbursementOverAssetsDateOfTermination Jan. 31, 2027
Expenses Restated to Reflect Current [Text] oef_ExpensesRestatedToReflectCurrent Management Fees have been restated to reflect current fees.
Expense Example [Heading] oef_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] oef_ExpenseExampleNarrativeTextBlock
This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. It assumes that you invest $10,000 in each share class of the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. For Class A shares, the example includes the front-end sales charge. The example also assumes that your investment earns a 5% return each year and that the Fund’s operating expenses are exactly as described in the preceding table. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
MassMutual Core Bond Fund | Class A  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.30% [1]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.32%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.87%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.04%)
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.83% [2]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 506
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 685
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 881
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,447
MassMutual Core Bond Fund | Administrative Class  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.30% [1]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.37%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.67%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.04%)
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.63% [2]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 64
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 209
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 368
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 829
MassMutual Core Bond Fund | Class R3  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.30% [1]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.07%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.04%)
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.03% [2]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 105
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 335
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 585
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,300
MassMutual Core Bond Fund | Class R5  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.30% [1]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.17%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.47%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.04%)
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.43% [2]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 44
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 145
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 257
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 586
MassMutual Core Bond Fund | Service Class  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.30% [1]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.57%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.04%)
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.53% [2]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 177
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 313
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 708
MassMutual Core Bond Fund | Class I  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.30% [1]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.07%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.37%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.04%)
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.33% [2]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 34
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 113
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 202
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 462
MassMutual Core Bond Fund | Class R4  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.30% [1]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.82%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.04%)
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.78% [2]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 80
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 256
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 449
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 1,008
MassMutual Core Bond Fund | Class Y  
Prospectus [Line Items] oef_ProspectusLineItems  
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.30% [1]
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.17%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.47%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.04%)
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.43% [2]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 44
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 145
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 257
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 $ 586
[1] Management Fees have been restated to reflect current fees.
[2] The expenses in the above table reflect a written agreement by MML Advisers to cap the fees and expenses of the Fund (other than extraordinary legal and other expenses, Acquired Fund Fees and Expenses, interest expense, expenses related to borrowings, securities lending, leverage, taxes, and brokerage, short sale dividend and loan expense, or other non-recurring or unusual expenses such as organizational expenses and shareholder meeting expenses, as applicable) through January 31, 2027, to the extent that Total Annual Fund Operating Expenses after Expense Reimbursement would otherwise exceed 0.33%, 0.43%, 0.53%, 0.63%, 0.78%, 0.83%, 1.03%, and 0.43% for Classes I, R5, Service, Administrative, R4, A, R3, and Y, respectively. The Total Annual Fund Operating Expenses after Expense Reimbursement shown in the above table may exceed these amounts, because, as noted in the previous sentence, certain fees and expenses are excluded from the cap. The agreement can only be terminated by mutual consent of the Board of Trustees on behalf of the Fund and MML Advisers.