v3.26.1
Shareholder Report
 6 Months Ended
Jun. 30, 2026
USD ($)
$ / shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name MML Series Investment Fund II
Entity Central Index Key 0001317146
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Initial Class  
Shareholder Report [Line Items]  
Fund Name MML VIP Barings Core Bond Fund (formerly known as MML Managed Bond Fund)
Class Name Initial Class
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Barings Core Bond Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Initial Class
$22
0.45%
[1]
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.45%
Net Assets $ 691,400,000
Holdings Count | $ / shares 390
Investment Company Portfolio Turnover 63.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$691.4
Total Number of Portfolio Holdings (includes derivative positions, if any)
390
Portfolio Turnover Rate
63%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Portfolio Characteristics
(% of Total Investments)
Corporate Debt
39.8%
Non-U.S. Government Agency Obligations
22.9%
U.S. Government Agency Obligations and Instrumentalities
22.0%
Commercial Paper
8.6%
U.S. Treasury Obligations
5.1%
Investment of Cash Collateral from Securities Loaned
0.9%
Repurchase Agreement
0.4%
Sovereign Debt Obligations
0.3%
Service Class  
Shareholder Report [Line Items]  
Fund Name MML VIP Barings Core Bond Fund (formerly known as MML Managed Bond Fund)
Class Name Service Class
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Barings Core Bond Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class
$35
0.70%
[2]
Expenses Paid, Amount $ 35
Expense Ratio, Percent 0.70%
Net Assets $ 691,400,000
Holdings Count | $ / shares 390
Investment Company Portfolio Turnover 63.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$691.4
Total Number of Portfolio Holdings (includes derivative positions, if any)
390
Portfolio Turnover Rate
63%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Portfolio Characteristics
(% of Total Investments)
Corporate Debt
39.8%
Non-U.S. Government Agency Obligations
22.9%
U.S. Government Agency Obligations and Instrumentalities
22.0%
Commercial Paper
8.6%
U.S. Treasury Obligations
5.1%
Investment of Cash Collateral from Securities Loaned
0.9%
Repurchase Agreement
0.4%
Sovereign Debt Obligations
0.3%
Initial Class  
Shareholder Report [Line Items]  
Fund Name MML VIP Barings Inflation-Protected and Income Fund (formerly known as MML Inflation-Protected and Income Fund)
Class Name Initial Class
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Barings Inflation-Protected and Income Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Initial Class
$32
0.65%
[3]
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.65%
Net Assets $ 160,000,000.0
Holdings Count | $ / shares 213
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$160.0
Total Number of Portfolio Holdings (includes derivative positions, if any)
213
Portfolio Turnover Rate
39%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Portfolio Characteristics
(% of Total Investments)
Non-U.S. Government Agency Obligations
59.6%
U.S. Treasury Obligations
23.3%
Commercial Paper
9.7%
Corporate Debt
5.0%
Exchange-Traded Funds
1.2%
U.S. Government Agency Obligations and Instrumentalities
0.7%
Repurchase Agreement
0.5%
Service Class  
Shareholder Report [Line Items]  
Fund Name MML VIP Barings Inflation-Protected and Income Fund (formerly known as MML Inflation-Protected and Income Fund)
Class Name Service Class
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Barings Inflation-Protected and Income Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class
$45
0.90%
[4]
Expenses Paid, Amount $ 45
Expense Ratio, Percent 0.90%
Net Assets $ 160,000,000.0
Holdings Count | $ / shares 213
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$160.0
Total Number of Portfolio Holdings (includes derivative positions, if any)
213
Portfolio Turnover Rate
39%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Portfolio Characteristics
(% of Total Investments)
Non-U.S. Government Agency Obligations
59.6%
U.S. Treasury Obligations
23.3%
Commercial Paper
9.7%
Corporate Debt
5.0%
Exchange-Traded Funds
1.2%
U.S. Government Agency Obligations and Instrumentalities
0.7%
Repurchase Agreement
0.5%
Class II  
Shareholder Report [Line Items]  
Fund Name MML VIP Barings Short-Duration Bond Fund (formerly known as MML Short-Duration Bond Fund)
Class Name Class II
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Barings Short-Duration Bond Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Class II
$30
0.60%
[5]
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.60%
Net Assets $ 103,100,000
Holdings Count | $ / shares 293
Investment Company Portfolio Turnover 37.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$103.1
Total Number of Portfolio Holdings (includes derivative positions, if any)
293
Portfolio Turnover Rate
37%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Portfolio Characteristics
(% of Total Investments)
Corporate Debt
50.7%
Non-U.S. Government Agency Obligations
44.0%
Repurchase Agreement
2.2%
Commercial Paper
1.9%
Sovereign Debt Obligations
0.7%
Investment of Cash Collateral from Securities Loaned
0.5%
U.S. Government Agency Obligations and Instrumentalities
0.0%
Service Class I  
Shareholder Report [Line Items]  
Fund Name MML VIP Barings Short-Duration Bond Fund (formerly known as MML Short-Duration Bond Fund)
Class Name Service Class I
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Barings Short-Duration Bond Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class I
$42
0.85%
[6]
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.85%
Net Assets $ 103,100,000
Holdings Count | $ / shares 293
Investment Company Portfolio Turnover 37.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$103.1
Total Number of Portfolio Holdings (includes derivative positions, if any)
293
Portfolio Turnover Rate
37%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Portfolio Characteristics
(% of Total Investments)
Corporate Debt
50.7%
Non-U.S. Government Agency Obligations
44.0%
Repurchase Agreement
2.2%
Commercial Paper
1.9%
Sovereign Debt Obligations
0.7%
Investment of Cash Collateral from Securities Loaned
0.5%
U.S. Government Agency Obligations and Instrumentalities
0.0%
Initial Class  
Shareholder Report [Line Items]  
Fund Name MML VIP Barings U.S. Government Money Market Fund (formerly known as MML U.S. Government Money Market Fund)
Class Name Initial Class
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Barings U.S. Government Money Market Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Initial Class
$26
0.53%
[7]
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.53%
Net Assets $ 200,800,000
Holdings Count | $ / shares 21
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$200.8
Total Number of Portfolio Holdings (includes derivative positions, if any)
21
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Portfolio Characteristics
(% of Total Investments)
Discount Notes
65.0%
U.S. Treasury Bills
22.3%
Repurchase Agreement
12.7%
Initial Class  
Shareholder Report [Line Items]  
Fund Name MML VIP BlackRock® Balanced Fund (formerly known as MML Blend Fund)
Class Name Initial Class
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP BlackRock® Balanced Fund†  (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Initial Class
$23
0.45%
[8]
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.45%
Net Assets $ 686,500,000
Holdings Count | $ / shares 10
Investment Company Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$686.5
Total Number of Portfolio Holdings (includes derivative positions, if any)
10
Portfolio Turnover Rate
4%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Sectors
(% of Total Investments)
Equity Funds
55.8%
Fixed Income Funds
35.4%
Service Class  
Shareholder Report [Line Items]  
Fund Name MML VIP BlackRock® Balanced Fund (formerly known as MML Blend Fund)
Class Name Service Class
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP BlackRock® Balanced Fund†  (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class
$36
0.70%
[9]
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.70%
Net Assets $ 686,500,000
Holdings Count | $ / shares 10
Investment Company Portfolio Turnover 4.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$686.5
Total Number of Portfolio Holdings (includes derivative positions, if any)
10
Portfolio Turnover Rate
4%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Sectors
(% of Total Investments)
Equity Funds
55.8%
Fixed Income Funds
35.4%
Class II  
Shareholder Report [Line Items]  
Fund Name MML VIP BlackRock iShares® 60/40 Allocation Fund (formerly known as MML iShares® 60/40 Allocation Fund)
Class Name Class II
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP BlackRock iShares® 60/40 Allocation Fund†  (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Class II
$24
0.46%
[10]
Expenses Paid, Amount $ 24
Expense Ratio, Percent 0.46%
Net Assets $ 90,800,000
Holdings Count | $ / shares 13
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$90.8
Total Number of Portfolio Holdings (includes derivative positions, if any)
13
Portfolio Turnover Rate
5%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Sectors
(% of Total Investments)
Equity Funds
60.0%
Fixed Income Funds
39.6%
Service Class I  
Shareholder Report [Line Items]  
Fund Name MML VIP BlackRock iShares® 60/40 Allocation Fund (formerly known as MML iShares® 60/40 Allocation Fund)
Class Name Service Class I
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP BlackRock iShares® 60/40 Allocation Fund†  (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class I
$36
0.71%
[11]
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.71%
Net Assets $ 90,800,000
Holdings Count | $ / shares 13
Investment Company Portfolio Turnover 5.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$90.8
Total Number of Portfolio Holdings (includes derivative positions, if any)
13
Portfolio Turnover Rate
5%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Sectors
(% of Total Investments)
Equity Funds
60.0%
Fixed Income Funds
39.6%
Class II  
Shareholder Report [Line Items]  
Fund Name MML VIP BlackRock iShares® 80/20 Allocation Fund (formerly known as MML iShares® 80/20 Allocation Fund)
Class Name Class II
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP BlackRock iShares® 80/20 Allocation Fund†  (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Class II
$24
0.46%
[12]
Expenses Paid, Amount $ 24
Expense Ratio, Percent 0.46%
Net Assets $ 189,300,000
Holdings Count | $ / shares 12
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$189.3
Total Number of Portfolio Holdings (includes derivative positions, if any)
12
Portfolio Turnover Rate
23%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Sectors
(% of Total Investments)
Equity Funds
79.6%
Fixed Income Funds
19.7%
Service Class I  
Shareholder Report [Line Items]  
Fund Name MML VIP BlackRock iShares® 80/20 Allocation Fund (formerly known as MML iShares® 80/20 Allocation Fund)
Class Name Service Class I
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP BlackRock iShares® 80/20 Allocation Fund†  (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class I
$37
0.71%
[13]
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.71%
Net Assets $ 189,300,000
Holdings Count | $ / shares 12
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$189.3
Total Number of Portfolio Holdings (includes derivative positions, if any)
12
Portfolio Turnover Rate
23%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Sectors
(% of Total Investments)
Equity Funds
79.6%
Fixed Income Funds
19.7%
Initial Class  
Shareholder Report [Line Items]  
Fund Name MML VIP Franklin Templeton Equity Fund (formerly known as MML Equity Fund)
Class Name Initial Class
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Franklin Templeton Equity Fund†  (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Initial Class
$23
0.43%
[14]
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.43%
Net Assets $ 951,600,000
Holdings Count | $ / shares 224
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$951.6
Total Number of Portfolio Holdings (includes derivative positions, if any)
224
Portfolio Turnover Rate
39%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Largest Holdings
(% of Total Investments)
JP Morgan Chase & Co.
4.4%
Johnson & Johnson
3.8%
Exxon Mobil Corp.
3.3%
Apple, Inc.
2.6%
Morgan Stanley
2.5%
Goldman Sachs Group, Inc.
2.3%
Microsoft Corp.
2.3%
QUALCOMM, Inc.
2.2%
Bank of America Corp.
2.0%
Walt Disney Co.
1.9%
Sectors
(% of Total Investments)
Financials
28.5%
Health Care
16.6%
Information Technology
8.9%
Consumer Discretionary
8.6%
Energy
8.2%
Consumer Staples
7.2%
Industrials
6.6%
Communication Services
6.5%
Materials
3.9%
Utilities
2.5%
Equity Funds
1.8%
Real Estate
0.1%
Service Class  
Shareholder Report [Line Items]  
Fund Name MML VIP Franklin Templeton Equity Fund (formerly known as MML Equity Fund)
Class Name Service Class
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Franklin Templeton Equity Fund†  (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class
$36
0.68%
[15]
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.68%
Net Assets $ 951,600,000
Holdings Count | $ / shares 224
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$951.6
Total Number of Portfolio Holdings (includes derivative positions, if any)
224
Portfolio Turnover Rate
39%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Largest Holdings
(% of Total Investments)
JP Morgan Chase & Co.
4.4%
Johnson & Johnson
3.8%
Exxon Mobil Corp.
3.3%
Apple, Inc.
2.6%
Morgan Stanley
2.5%
Goldman Sachs Group, Inc.
2.3%
Microsoft Corp.
2.3%
QUALCOMM, Inc.
2.2%
Bank of America Corp.
2.0%
Walt Disney Co.
1.9%
Sectors
(% of Total Investments)
Financials
28.5%
Health Care
16.6%
Information Technology
8.9%
Consumer Discretionary
8.6%
Energy
8.2%
Consumer Staples
7.2%
Industrials
6.6%
Communication Services
6.5%
Materials
3.9%
Utilities
2.5%
Equity Funds
1.8%
Real Estate
0.1%
Service Class I  
Shareholder Report [Line Items]  
Fund Name MML VIP Invesco Discovery Large Cap Fund (formerly known as MML Invesco Discovery Large Cap Fund)
Class Name Service Class I
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Invesco Discovery Large Cap Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class I
$53
1.00%
[16]
Expenses Paid, Amount $ 53
Expense Ratio, Percent 1.00%
Net Assets $ 528,500,000
Holdings Count | $ / shares 54
Investment Company Portfolio Turnover 51.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$528.5
Total Number of Portfolio Holdings (includes derivative positions, if any)
54
Portfolio Turnover Rate
51%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Largest Holdings
(% of Total Investments)
NVIDIA Corp.
10.0%
Alphabet, Inc. Class C
7.3%
Amazon.com, Inc.
5.6%
Lam Research Corp.
5.4%
Apple, Inc.
5.2%
Advanced Micro Devices, Inc.
3.4%
Western Digital Corp.
3.3%
Taiwan Semiconductor Manufacturing Co. Ltd. Sponsored ADR
3.2%
Applied Materials, Inc.
3.0%
Microsoft Corp.
2.9%
Sectors
(% of Total Investments)
Information Technology
51.4%
Industrials
16.0%
Consumer Discretionary
10.2%
Communication Services
9.6%
Health Care
4.2%
Energy
3.1%
Financials
2.3%
Consumer Staples
1.2%
Materials
1.0%
Real Estate
0.7%
Class II  
Shareholder Report [Line Items]  
Fund Name MML VIP Invesco Discovery Large Cap Fund (formerly known as MML Invesco Discovery Large Cap Fund)
Class Name Class II
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Invesco Discovery Large Cap Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Class II
$39
0.75%
[17]
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.75%
Net Assets $ 528,500,000
Holdings Count | $ / shares 54
Investment Company Portfolio Turnover 51.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$528.5
Total Number of Portfolio Holdings (includes derivative positions, if any)
54
Portfolio Turnover Rate
51%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Largest Holdings
(% of Total Investments)
NVIDIA Corp.
10.0%
Alphabet, Inc. Class C
7.3%
Amazon.com, Inc.
5.6%
Lam Research Corp.
5.4%
Apple, Inc.
5.2%
Advanced Micro Devices, Inc.
3.4%
Western Digital Corp.
3.3%
Taiwan Semiconductor Manufacturing Co. Ltd. Sponsored ADR
3.2%
Applied Materials, Inc.
3.0%
Microsoft Corp.
2.9%
Sectors
(% of Total Investments)
Information Technology
51.4%
Industrials
16.0%
Consumer Discretionary
10.2%
Communication Services
9.6%
Health Care
4.2%
Energy
3.1%
Financials
2.3%
Consumer Staples
1.2%
Materials
1.0%
Real Estate
0.7%
Service Class I  
Shareholder Report [Line Items]  
Fund Name MML VIP Invesco Discovery Mid Cap Fund (formerly known as MML Invesco Discovery Mid Cap Fund)
Class Name Service Class I
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Invesco Discovery Mid Cap Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class I
$62
1.10%
[18]
Expenses Paid, Amount $ 62
Expense Ratio, Percent 1.10%
Net Assets $ 447,000,000.0
Holdings Count | $ / shares 76
Investment Company Portfolio Turnover 61.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$447.0
Total Number of Portfolio Holdings (includes derivative positions, if any)
76
Portfolio Turnover Rate
61%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Largest Holdings
(% of Total Investments)
Flex Ltd.
3.4%
Hilton Worldwide Holdings, Inc.
2.9%
Comfort Systems USA, Inc.
2.8%
Monolithic Power Systems, Inc.
2.8%
Quanta Services, Inc.
2.8%
MasTec, Inc.
2.5%
Lattice Semiconductor Corp.
2.5%
MACOM Technology Solutions Holdings, Inc.
2.3%
Teradyne, Inc.
2.3%
Carpenter Technology Corp.
2.1%
Sectors
(% of Total Investments)
Information Technology
32.4%
Industrials
31.4%
Health Care
9.0%
Consumer Discretionary
8.5%
Energy
5.9%
Financials
4.3%
Materials
2.3%
Consumer Staples
1.7%
Communication Services
1.5%
Real Estate
0.6%
Class II  
Shareholder Report [Line Items]  
Fund Name MML VIP Invesco Discovery Mid Cap Fund (formerly known as MML Invesco Discovery Mid Cap Fund)
Class Name Class II
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Invesco Discovery Mid Cap Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Class II
$48
0.85%
[19]
Expenses Paid, Amount $ 48
Expense Ratio, Percent 0.85%
Net Assets $ 447,000,000.0
Holdings Count | $ / shares 76
Investment Company Portfolio Turnover 61.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$447.0
Total Number of Portfolio Holdings (includes derivative positions, if any)
76
Portfolio Turnover Rate
61%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Largest Holdings
(% of Total Investments)
Flex Ltd.
3.4%
Hilton Worldwide Holdings, Inc.
2.9%
Comfort Systems USA, Inc.
2.8%
Monolithic Power Systems, Inc.
2.8%
Quanta Services, Inc.
2.8%
MasTec, Inc.
2.5%
Lattice Semiconductor Corp.
2.5%
MACOM Technology Solutions Holdings, Inc.
2.3%
Teradyne, Inc.
2.3%
Carpenter Technology Corp.
2.1%
Sectors
(% of Total Investments)
Information Technology
32.4%
Industrials
31.4%
Health Care
9.0%
Consumer Discretionary
8.5%
Energy
5.9%
Financials
4.3%
Materials
2.3%
Consumer Staples
1.7%
Communication Services
1.5%
Real Estate
0.6%
Initial Class  
Shareholder Report [Line Items]  
Fund Name MML VIP Invesco Small Cap Equity Fund (formerly known as MML Small Cap Equity Fund)
Class Name Initial Class
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Invesco Small Cap Equity Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Initial Class
$39
0.71%
[20]
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.71%
Net Assets $ 147,300,000
Holdings Count | $ / shares 102
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$147.3
Total Number of Portfolio Holdings (includes derivative positions, if any)
102
Portfolio Turnover Rate
39%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Largest Holdings
(% of Total Investments)
Columbia Banking System, Inc.
2.0%
Enpro, Inc.
1.9%
Outfront Media, Inc.
1.9%
Kodiak Gas Services, Inc.
1.8%
AAR Corp.
1.8%
MaxLinear, Inc.
1.8%
Zurn Elkay Water Solutions Corp. Class C
1.7%
AutoNation, Inc.
1.7%
Cathay General Bancorp
1.6%
BrightSpring Health Services, Inc.
1.6%
Sectors
(% of Total Investments)
Industrials
19.5%
Financials
18.3%
Health Care
14.1%
Consumer Discretionary
13.7%
Information Technology
13.6%
Real Estate
5.4%
Energy
5.2%
Materials
3.3%
Utilities
2.6%
Consumer Staples
1.5%
Communication Services
0.8%
Service Class  
Shareholder Report [Line Items]  
Fund Name MML VIP Invesco Small Cap Equity Fund (formerly known as MML Small Cap Equity Fund)
Class Name Service Class
No Trading Symbol true
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about the MML VIP Invesco Small Cap Equity Fund (the “Fund”) for the period of January 1, 2026 to June 30, 2026.
Additional Information [Text Block] You can find additional information about the Fund at https://www.massmutual.com/product-performance/variable-insurance-funds. You can also request this information by contacting us at 1-888-309-3539 or by sending an email request to fundinfo@massmutual.com.
Additional Information Phone Number 1-888-309-3539
Additional Information Email fundinfo@massmutual.com
Additional Information Website https://www.massmutual.com/product-performance/variable-insurance-funds
Expenses [Text Block]
WHAT WERE THE FUND COSTS FOR THE LAST SIX MONTHS?
This example shows the expenses you would have paid over the past six months, based on a hypothetical $10,000 investment. This table reflects any applicable waivers or expense limitations.
Class Name
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment*
Service Class
$52
0.96%
[21]
Expenses Paid, Amount $ 52
Expense Ratio, Percent 0.96%
Net Assets $ 147,300,000
Holdings Count | $ / shares 102
Investment Company Portfolio Turnover 39.00%
Additional Fund Statistics [Text Block]
WHAT ARE SOME KEY FUND STATISTICS? (as of June 30, 2026)
Total Net Assets (Millions)
$147.3
Total Number of Portfolio Holdings (includes derivative positions, if any)
102
Portfolio Turnover Rate
39%
Holdings [Text Block]
WHAT DID THE FUND INVEST IN? (as of June 30, 2026)
Derivative values, if any, are excluded from the table(s) below.
Largest Holdings
(% of Total Investments)
Columbia Banking System, Inc.
2.0%
Enpro, Inc.
1.9%
Outfront Media, Inc.
1.9%
Kodiak Gas Services, Inc.
1.8%
AAR Corp.
1.8%
MaxLinear, Inc.
1.8%
Zurn Elkay Water Solutions Corp. Class C
1.7%
AutoNation, Inc.
1.7%
Cathay General Bancorp
1.6%
BrightSpring Health Services, Inc.
1.6%
Sectors
(% of Total Investments)
Industrials
19.5%
Financials
18.3%
Health Care
14.1%
Consumer Discretionary
13.7%
Information Technology
13.6%
Real Estate
5.4%
Energy
5.2%
Materials
3.3%
Utilities
2.6%
Consumer Staples
1.5%
Communication Services
0.8%
[1]
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