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Fees and Expenses
Dec. 31, 2025
Bond-Debenture Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. The table does not reflect the fees and expenses of variable annuity contracts or variable life insurance policies (together, “Variable Contracts”). If such fees and expenses were reflected, expenses shown would be higher.

   

Annual Fund Operating Expenses

 

(Expenses that you pay each year as a percentage of the value of your investment)

 

Class

VC Shares

 

Management Fees

0.47%

 

Other Expenses

0.42%

 

Acquired Fund Fees and Expenses(1)

0.09%

 

Total Annual Fund Operating Expenses

0.98%

 

  

(1)

Includes interest expense from certain underlying affiliated funds of 0.09%. Excluding interest expense of the applicable underlying affiliated funds, Total Annual Fund Operating Expenses is 0.89%.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The Example does not reflect Variable Contract expenses, fees, and charges. If these expenses, fees, and charges were included, your costs would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Bond-Debenture Portfolio
VC Shares
USD ($)
Expense Example, with Redemption, 1 Year $ 100
Expense Example, with Redemption, 3 Years 312
Expense Example, with Redemption, 5 Years 542
Expense Example, with Redemption, 10 Years $ 1,201
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance.

During the most recent fiscal year, the Fund’s portfolio turnover rate was 306% of the average value of its portfolio.
Portfolio Turnover, Rate 306.00%
Developing Growth Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. The table does not reflect the fees and expenses of variable annuity contracts or variable life insurance policies (together, “Variable Contracts”). If such fees and expenses were reflected, expenses shown would be higher.

   

Annual Fund Operating Expenses

 

(Expenses that you pay each year as a percentage of the value of your investment)

 

Class

VC Shares

 

Management Fees

0.75%

 

Other Expenses

0.52%

 

Total Annual Fund Operating Expenses

1.27%

 

Fee Waiver and/or Expense Reimbursement(1)

(0.23)%

 

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement(1)

1.04%

 

  

(1)

For the period from May 1, 2026 through April 30, 2027, Lord, Abbett & Co. LLC (“Lord Abbett”) has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses, excluding any acquired fund fees and expenses, interest-related expenses, taxes, expenses related to litigation and potential litigation, and extraordinary expenses, to an annual rate of 1.04%. This agreement may be terminated only by the Fund’s Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. The Example does not reflect Variable Contract expenses, fees, and charges. If these expenses, fees, and charges were included, your costs would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Developing Growth Portfolio
VC Shares
USD ($)
Expense Example, with Redemption, 1 Year $ 106
Expense Example, with Redemption, 3 Years 380
Expense Example, with Redemption, 5 Years 675
Expense Example, with Redemption, 10 Years $ 1,514
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 117% of the average value of its portfolio.
Portfolio Turnover, Rate 117.00%
Dividend Growth Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. The table does not reflect the fees and expenses of variable annuity contracts or variable life insurance policies (together, “Variable Contracts”). If such fees and expenses were reflected, expenses shown would be higher.

   

Annual Fund Operating Expenses

 

(Expenses that you pay each year as a percentage of the value of your investment)

 

Class

VC Shares

 

Management Fees

0.55%

 

Other Expenses

0.45%

 

Total Annual Fund Operating Expenses

1.00%

 

Fee Waiver and/or Expense Reimbursement(1)

(0.01)%

 

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement(1)

0.99%

 

  

(1)

For the period from May 1, 2026 through April 30, 2027, Lord, Abbett & Co. LLC (“Lord Abbett”) has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses, excluding any acquired fund fees and expenses, interest-related expenses, taxes, expenses related to litigation and potential litigation, and extraordinary expenses, to an annual rate of 0.99%. This agreement may be terminated only by the Fund’s Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. The Example does not reflect Variable Contract expenses, fees, and charges. If these expenses, fees, and charges were included, your costs would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Dividend Growth Portfolio
VC Shares
USD ($)
Expense Example, with Redemption, 1 Year $ 101
Expense Example, with Redemption, 3 Years 317
Expense Example, with Redemption, 5 Years 551
Expense Example, with Redemption, 10 Years $ 1,224
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 32% of the average value of its portfolio.
Portfolio Turnover, Rate 32.00%
Fundamental Equity Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. The table does not reflect the fees and expenses of variable annuity contracts or variable life insurance policies (together, “Variable Contracts”). If such fees and expenses were reflected, expenses shown would be higher.

   

Annual Fund Operating Expenses

 

(Expenses that you pay each year as a percentage of the value of your investment)

 

Class

VC Shares

 

Management Fees

0.74%

 

Other Expenses

0.45%

 

Total Annual Fund Operating Expenses

1.19%

 

Fee Waiver and/or Expense Reimbursement(1)

(0.11)%

 

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement(1)

1.08%

 

  

(1)

For the period from May 1, 2026 through April 30, 2027, Lord, Abbett & Co. LLC (“Lord Abbett”) has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses, excluding any acquired fund fees and expenses, interest-related expenses, taxes, expenses related to litigation and potential litigation, and extraordinary expenses, to an annual rate of 1.08%. This agreement may be terminated only by the Fund’s Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. The Example does not reflect Variable Contract expenses, fees, and charges. If these expenses, fees, and charges were included, your costs would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Fundamental Equity Portfolio
VC Shares
USD ($)
Expense Example, with Redemption, 1 Year $ 110
Expense Example, with Redemption, 3 Years 367
Expense Example, with Redemption, 5 Years 644
Expense Example, with Redemption, 10 Years $ 1,433
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 74% of the average value of its portfolio.
Portfolio Turnover, Rate 74.00%
Growth and Income Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. The table does not reflect the fees and expenses of variable annuity contracts or variable life insurance policies (together, “Variable Contracts”). If such fees and expenses were reflected, expenses shown would be higher.

   

Annual Fund Operating Expenses

 

(Expenses that you pay each year as a percentage of the value of your investment)

 

Class

VC Shares

 

Management Fees

0.50%

 

Other Expenses

0.43%

 

Total Annual Fund Operating Expenses

0.93%

 

  
  
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The Example does not reflect Variable Contract expenses, fees, and charges. If these expenses, fees, and charges were included, your costs would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Growth and Income Portfolio
VC Shares
USD ($)
Expense Example, with Redemption, 1 Year $ 95
Expense Example, with Redemption, 3 Years 296
Expense Example, with Redemption, 5 Years 515
Expense Example, with Redemption, 10 Years $ 1,143
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 38% of the average value of its portfolio.
Portfolio Turnover, Rate 38.00%
Growth Opportunities Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. The table does not reflect the fees and expenses of variable annuity contracts or variable life insurance policies (together, “Variable Contracts”). If such fees and expenses were reflected, expenses shown would be higher.

   

Annual Fund Operating Expenses

 

(Expenses that you pay each year as a percentage of the value of your investment)

 

Class

VC Shares

 

Management Fees

0.65%

 

Other Expenses

0.50%

 

Total Annual Fund Operating Expenses

1.15%

 

  
  
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The Example does not reflect Variable Contract expenses, fees, and charges. If these expenses, fees, and charges were included, your costs would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Growth Opportunities Portfolio
VC Shares
USD ($)
Expense Example, with Redemption, 1 Year $ 117
Expense Example, with Redemption, 3 Years 365
Expense Example, with Redemption, 5 Years 633
Expense Example, with Redemption, 10 Years $ 1,398
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 135% of the average value of its portfolio.
Portfolio Turnover, Rate 135.00%
Mid Cap Stock Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. The table does not reflect the fees and expenses of variable annuity contracts or variable life insurance policies (together, “Variable Contracts”). If such fees and expenses were reflected, expenses shown would be higher.

   

Annual Fund Operating Expenses

 

(Expenses that you pay each year as a percentage of the value of your investment)

 

Class

VC Shares

 

Management Fees

0.73%

 

Other Expenses

0.42%

 

Total Annual Fund Operating Expenses

1.15%

 

  
  
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The Example does not reflect Variable Contract expenses, fees, and charges. If these expenses, fees, and charges were included, your costs would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Mid Cap Stock Portfolio
VC Shares
USD ($)
Expense Example, with Redemption, 1 Year $ 117
Expense Example, with Redemption, 3 Years 365
Expense Example, with Redemption, 5 Years 633
Expense Example, with Redemption, 10 Years $ 1,398
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 45% of the average value of its portfolio.
Portfolio Turnover, Rate 45.00%
Short Duration Income Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. The table does not reflect the fees and expenses of variable annuity contracts or variable life insurance policies (together, “Variable Contracts”). If such fees and expenses were reflected, expenses shown would be higher.

    

Annual Fund Operating Expenses

 

(Expenses that you pay each year as a percentage of the value of your investment)

 

Class

 I

VC

 

Management Fees

0.35%

0.35%

 

Other Expenses

0.24%

0.49%

 

Total Annual Fund Operating Expenses

0.59%

0.84%

 

Fee Waiver and/or Expense Reimbursement(1)

(0.12)%

(0.12)%

 

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement(1)

0.47%

0.72%

 

  

(1)

For the period from May 1, 2026 through April 30, 2027, Lord, Abbett & Co. LLC (“Lord Abbett”) has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses, excluding any acquired fund fees and expenses, interest-related expenses, taxes, expenses related to litigation and potential litigation, and extraordinary expenses, to an annual rate of 0.47% for Class I and 0.72% for Class VC. This agreement may be terminated only by the Fund’s Board of Directors.
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. The Example does not reflect Variable Contract expenses, fees, and charges. If these expenses, fees, and charges were included, your costs would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Short Duration Income Portfolio - USD ($)
I Shares
VC Shares
Expense Example, with Redemption, 1 Year $ 48 $ 74
Expense Example, with Redemption, 3 Years 177 256
Expense Example, with Redemption, 5 Years 317 454
Expense Example, with Redemption, 10 Years $ 726 $ 1,026
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 153% of the average value of its portfolio.
Portfolio Turnover, Rate 153.00%
Total Return Portfolio  
Prospectus [Line Items]  
Expense Heading [Optional Text] FEES AND EXPENSES
Expense Narrative [Text Block]

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below. The table does not reflect the fees and expenses of variable annuity contracts or variable life insurance policies (together, “Variable Contracts”). If such fees and expenses were reflected, expenses shown would be higher.

   

Annual Fund Operating Expenses

 

(Expenses that you pay each year as a percentage of the value of your investment)

 

Class

VC Shares

 

Management Fees

0.28%

 

Other Expenses

0.43%

 

Total Annual Fund Operating Expenses

0.71%

 

  
  
Expense Example [Heading] Example
Expense Example Narrative [Text Block]

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The Example does not reflect Variable Contract expenses, fees, and charges. If these expenses, fees, and charges were included, your costs would be higher. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, With Redemption [Table]
Expense Example - Total Return Portfolio
VC Shares
USD ($)
Expense Example, with Redemption, 1 Year $ 73
Expense Example, with Redemption, 3 Years 227
Expense Example, with Redemption, 5 Years 395
Expense Example, with Redemption, 10 Years $ 883
Portfolio Turnover [Heading] Portfolio Turnover
Portfolio Turnover [Text Block] The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 428% of the average value of its portfolio.
Portfolio Turnover, Rate 428.00%