XML 61 R7.htm IDEA: XBRL DOCUMENT v3.26.1
Performance Management
Dec. 31, 2025
Bond-Debenture Portfolio  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.

Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns.
Bar Chart Narrative [Text Block]

The bar chart shows changes in the performance of the Fund’s Class VC shares from calendar year to calendar year. This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.

Bar Chart Does Not Reflect Sales Loads [Text] This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.
Bar Chart [Heading] Bar Chart (per calendar year) - Class VC Shares
Bar Chart Closing [Text Block]

Best Quarter 2nd Q 2020 +10.40%    Worst Quarter 1st Q 2020 -12.42%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

The table below shows how the Fund’s average annual total returns compare to the returns of securities market indices with investment characteristics similar to those of the Fund.
Performance [Table]
Average Annual Total Returns - Bond-Debenture Portfolio
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg U.S. Aggregate Bond Index | Average Annual Return, Label [Optional Text] Bloomberg U.S. Aggregate Bond Index      
Bloomberg U.S. Aggregate Bond Index | Average Annual Return, Percent   7.30% (0.36%) 2.01%
ICE BofA U.S. High Yield Constrained Index | Average Annual Return, Label [Optional Text] ICE BofA U.S. High Yield Constrained Index      
ICE BofA U.S. High Yield Constrained Index | Average Annual Return, Percent   8.59% 4.56% 6.47%
VC Shares | Average Annual Return, Percent   8.33% 2.10% 4.72%
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Bond-Debenture Portfolio | VC Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 10.40%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (12.42%)
Lowest Quarterly Return, Date Mar. 31, 2020
Developing Growth Portfolio  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.

Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns.
Bar Chart Narrative [Text Block]

The bar chart shows changes in the performance of the Fund’s Class VC shares from calendar year to calendar year. This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.

Bar Chart Does Not Reflect Sales Loads [Text] This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.
Bar Chart [Heading] Bar Chart (per calendar year) - Class VC Shares
Bar Chart Closing [Text Block]

Best Quarter 2nd Q 2020 +40.86%    Worst Quarter 4th Q 2018 -23.96%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1

1The Fund has adopted the S&P 500® Index as its broad-based securities market index.
Performance [Table]
Average Annual Total Returns - Developing Growth Portfolio
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 2000® Growth Index | Average Annual Return, Label [Optional Text] Russell 2000® Growth Index      
Russell 2000® Growth Index | Average Annual Return, Percent   13.01% 3.18% 9.57%
S&P 500® Index | Average Annual Return, Label [Optional Text] S&P 500® Index      
S&P 500® Index | Average Annual Return, Percent   17.88% 14.42% 14.82%
VC Shares | Average Annual Return, Percent   14.59% (1.17%) 11.03%
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Developing Growth Portfolio | VC Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 40.86%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (23.96%)
Lowest Quarterly Return, Date Dec. 31, 2018
Dividend Growth Portfolio  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.

Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns.
Bar Chart Narrative [Text Block]

The bar chart shows changes in the performance of the Fund’s Class VC shares from calendar year to calendar year. This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.

Bar Chart Does Not Reflect Sales Loads [Text] This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.
Bar Chart [Heading] Bar Chart (per calendar year) - Class VC Shares
Bar Chart Closing [Text Block]

Best Quarter 2nd Q 2020 +19.16%    Worst Quarter 1st Q 2020 -19.86%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund.
Performance [Table]
Average Annual Total Returns - Dividend Growth Portfolio
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
S&P 500® Index | Average Annual Return, Label [Optional Text] S&P 500® Index      
S&P 500® Index | Average Annual Return, Percent   17.88% 14.42% 14.82%
VC Shares | Average Annual Return, Percent   15.98% 12.34% 13.06%
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Dividend Growth Portfolio | VC Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 19.16%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (19.86%)
Lowest Quarterly Return, Date Mar. 31, 2020
Fundamental Equity Portfolio  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.

Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns.
Bar Chart Narrative [Text Block]

The bar chart shows changes in the performance of the Fund’s Class VC shares from calendar year to calendar year. This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.

Bar Chart Does Not Reflect Sales Loads [Text] This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.
Bar Chart [Heading] Bar Chart (per calendar year) - Class VC Shares
Bar Chart Closing [Text Block]

Best Quarter 2nd Q 2020 +16.55%    Worst Quarter 1st Q 2020 -28.05%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

The table below shows how the Fund’s average annual total returns compare to the returns of securities market indices with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1

1 The Fund has adopted the S&P 500® Index as its broad-based securities market index.
Performance [Table]
Average Annual Total Returns - Fundamental Equity Portfolio
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 1000® Value Index | Average Annual Return, Label [Optional Text] Russell 1000® Value Index      
Russell 1000® Value Index | Average Annual Return, Percent   15.91% 11.33% 10.53%
Russell 3000® Index | Average Annual Return, Label [Optional Text] Russell 3000® Index      
Russell 3000® Index | Average Annual Return, Percent   17.15% 13.15% 14.29%
Russell 3000® Value Index | Average Annual Return, Label [Optional Text] Russell 3000® Value Index      
Russell 3000® Value Index | Average Annual Return, Percent   15.71% 11.18% 10.46%
S&P 500® Index | Average Annual Return, Label [Optional Text] S&P 500® Index      
S&P 500® Index | Average Annual Return, Percent   17.88% 14.42% 14.82%
VC Shares | Average Annual Return, Percent   14.29% 11.36% 9.75%
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Fundamental Equity Portfolio | VC Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 16.55%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (28.05%)
Lowest Quarterly Return, Date Mar. 31, 2020
Growth and Income Portfolio  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.

Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns.
Bar Chart Narrative [Text Block]

The bar chart shows changes in the performance of the Fund’s Class VC shares from calendar year to calendar year. This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.

Bar Chart Does Not Reflect Sales Loads [Text] This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.
Bar Chart [Heading] Bar Chart (per calendar year) - Class VC Shares
Bar Chart Closing [Text Block]

Best Quarter 2nd Q 2020 +16.77%    Worst Quarter 1st Q 2020 -27.02%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

The table below shows how the Fund’s average annual total returns compare to the returns of securities market indices with investment characteristics similar to those of the Fund.
Performance [Table]
Average Annual Total Returns - Growth and Income Portfolio
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell 1000® Value Index | Average Annual Return, Label [Optional Text] Russell 1000® Value Index      
Russell 1000® Value Index | Average Annual Return, Percent   15.91% 11.33% 10.53%
S&P 500® Index | Average Annual Return, Label [Optional Text] S&P 500® Index      
S&P 500® Index | Average Annual Return, Percent   17.88% 14.42% 14.82%
S&P 500® Value Index | Average Annual Return, Label [Optional Text] S&P 500® Value Index      
S&P 500® Value Index | Average Annual Return, Percent   13.19% 12.96% 11.73%
VC Shares | Average Annual Return, Percent   17.29% 13.34% 11.12%
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Growth and Income Portfolio | VC Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 16.77%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (27.02%)
Lowest Quarterly Return, Date Mar. 31, 2020
Growth Opportunities Portfolio  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.

Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns.
Bar Chart Narrative [Text Block]

The bar chart shows changes in the performance of the Fund’s Class VC shares from calendar year to calendar year. This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.

Bar Chart Does Not Reflect Sales Loads [Text] This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.
Bar Chart [Heading] Bar Chart (per calendar year) - Class VC Shares
Bar Chart Closing [Text Block]

Best Quarter 2nd Q 2020 +31.83%    Worst Quarter 1st Q 2020 -19.89%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

The table below shows how the Fund’s average annual total returns compare to the returns of securities market indices with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1

1 The Fund has adopted the S&P 500® Index as its broad-based securities market index.
Performance [Table]
Average Annual Total Returns - Growth Opportunities Portfolio
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell Midcap® Growth Index | Average Annual Return, Label [Optional Text] Russell Midcap® Growth Index      
Russell Midcap® Growth Index | Average Annual Return, Percent   8.66% 6.65% 12.49%
Russell Midcap® Index | Average Annual Return, Label [Optional Text] Russell Midcap® Index      
Russell Midcap® Index | Average Annual Return, Percent   10.60% 8.67% 11.01%
S&P 500® Index | Average Annual Return, Label [Optional Text] S&P 500® Index      
S&P 500® Index | Average Annual Return, Percent   17.88% 14.42% 14.82%
VC Shares | Average Annual Return, Percent   12.94% 3.23% 10.41%
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Growth Opportunities Portfolio | VC Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 31.83%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (19.89%)
Lowest Quarterly Return, Date Mar. 31, 2020
Mid Cap Stock Portfolio  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.

Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns.
Bar Chart Narrative [Text Block]

The bar chart shows changes in the performance of the Fund’s Class VC shares from calendar year to calendar year. This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.

Bar Chart Does Not Reflect Sales Loads [Text] This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.
Bar Chart [Heading] Bar Chart (per calendar year) - Class VC Shares
Bar Chart Closing [Text Block]

Best Quarter 4th Q 2020 +22.82%    Worst Quarter 1st Q 2020 -30.54%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

The table below shows how the Fund’s average annual total returns compare to the returns of securities market indices with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1

1 The Fund has adopted the S&P 500® Index as its broad-based securities market index.
Performance [Table]
Average Annual Total Returns - Mid Cap Stock Portfolio
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Russell Midcap® Value Index | Average Annual Return, Label [Optional Text] Russell Midcap® Value Index      
Russell Midcap® Value Index | Average Annual Return, Percent   11.05% 9.83% 9.78%
S&P MidCap 400® Value Index | Average Annual Return, Label [Optional Text] S&P MidCap 400® Value Index      
S&P MidCap 400® Value Index | Average Annual Return, Percent   7.58% 11.01% 10.69%
S&P 500® Index | Average Annual Return, Label [Optional Text] S&P 500® Index      
S&P 500® Index | Average Annual Return, Percent   17.88% 14.42% 14.82%
VC Shares | Average Annual Return, Percent   7.05% 10.16% 7.98%
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Mid Cap Stock Portfolio | VC Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 22.82%
Highest Quarterly Return, Date Dec. 31, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (30.54%)
Lowest Quarterly Return, Date Mar. 31, 2020
Short Duration Income Portfolio  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. No performance is shown for Class I shares because this class has not completed a full calendar year of operations.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns.
Bar Chart Narrative [Text Block]

The bar chart shows changes in the performance of the Fund’s Class VC shares from calendar year to calendar year. This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower. Performance for the Fund's Class I shares will vary due to the different expenses each class bears.
Bar Chart Does Not Reflect Sales Loads [Text] This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.
Bar Chart [Heading] Bar Chart (per calendar year) - Class VC Shares
Bar Chart Closing [Text Block]

Best Quarter 2nd Q 2020 +5.92%    Worst Quarter 1st Q 2020 -5.33%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1

1 The Fund has adopted the Bloomberg U.S. Aggregate Bond Index as its broad-based securities market index.
Performance [Table]
Average Annual Total Returns - Short Duration Income Portfolio
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
ICE BofA 1–3 Year U.S. Corporate Index | Average Annual Return, Label [Optional Text] ICE BofA 1–3 Year U.S. Corporate Index      
ICE BofA 1–3 Year U.S. Corporate Index | Average Annual Return, Percent   5.93% 2.53% 2.81%
Bloomberg U.S. Aggregate Bond Index | Average Annual Return, Label [Optional Text] Bloomberg U.S. Aggregate Bond Index      
Bloomberg U.S. Aggregate Bond Index | Average Annual Return, Percent   7.30% (0.36%) 2.01%
VC Shares | Average Annual Return, Percent   5.90% 2.25% 2.62%
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Short Duration Income Portfolio | VC Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 5.92%
Highest Quarterly Return, Date Jun. 30, 2020
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (5.33%)
Lowest Quarterly Return, Date Mar. 31, 2020
Total Return Portfolio  
Prospectus [Line Items]  
Bar Chart and Performance Table [Heading] PERFORMANCE
Performance Narrative [Text Block]

The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.

Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future.
Performance Information Illustrates Variability of Returns [Text] The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns.
Bar Chart Narrative [Text Block]

The bar chart shows changes in the performance of the Fund’s Class VC shares from calendar year to calendar year. This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.

Bar Chart Does Not Reflect Sales Loads [Text] This chart does not reflect the sales charges or other expenses of Variable Contracts. If those sales charges and expenses were reflected, returns would be lower.
Bar Chart [Heading] Bar Chart (per calendar year) - Class VC Shares
Bar Chart Closing [Text Block]

Best Quarter 4th Q 2023 +6.80%    Worst Quarter 2nd Q 2022 -5.99%
Performance Table Heading Average Annual Total Returns (for the periods ended December 31, 2025)
Performance Table Narrative

The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund.
Performance [Table]
Average Annual Total Returns - Total Return Portfolio
 12 Months Ended 60 Months Ended 120 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Bloomberg U.S. Aggregate Bond Index | Average Annual Return, Label [Optional Text] Bloomberg U.S. Aggregate Bond Index      
Bloomberg U.S. Aggregate Bond Index | Average Annual Return, Percent   7.30% (0.36%) 2.01%
VC Shares | Average Annual Return, Percent   7.19% 0.06% 2.27%
Index No Deduction for Fees, Expenses, or Taxes [Text] (reflects no deduction for fees, expenses, or taxes)
Total Return Portfolio | VC Shares  
Prospectus [Line Items]  
Highest Quarterly Return, Label [Optional Text] Best Quarter
Highest Quarterly Return 6.80%
Highest Quarterly Return, Date Dec. 31, 2023
Lowest Quarterly Return, Label [Optional Text] Worst Quarter
Lowest Quarterly Return (5.99%)
Lowest Quarterly Return, Date Jun. 30, 2022