Shareholder Report |
6 Months Ended | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2026
USD ($)
Holding
| ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Document Type | N-CSRS | |||||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||||
| Registrant Name | LORD ABBETT SERIES FUND INC | |||||||||||||||||||||
| Entity Central Index Key | 0000855396 | |||||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||||
| Document Period End Date | Jun. 30, 2026 | |||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report | |||||||||||||||||||||
| C000020055 | ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Fund Name | Lord Abbett Bond Debenture Portfolio | |||||||||||||||||||||
| Class Name | Class VC | |||||||||||||||||||||
| No Trading Symbol [Flag] | true | |||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Bond Debenture Portfolio for the period of January 1, 2026 to June 30, 2026 (the "reporting period"). | |||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.lordabbett.com/seriesfunds. You can also request this information by contacting us at 888-522-2388. | |||||||||||||||||||||
| Additional Information Phone Number | 888-522-2388 | |||||||||||||||||||||
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.lordabbett.com/seriesfunds</span> | |||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||
| Expenses Paid, Amount | $ 44 | |||||||||||||||||||||
| Expense Ratio, Percent | 0.87% | [1] | ||||||||||||||||||||
| AssetsNet | $ 1,204,819,667 | |||||||||||||||||||||
| Holdings Count | Holding | 915 | |||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 156.00% | |||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||
| C000087850 | ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Fund Name | Lord Abbett Developing Growth Portfolio | |||||||||||||||||||||
| Class Name | Class VC | |||||||||||||||||||||
| No Trading Symbol [Flag] | true | |||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Developing Growth Portfolio for the period of January 1, 2026 to June 30, 2026 (the "reporting period"). | |||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.lordabbett.com/seriesfunds. You can also request this information by contacting us at 888-522-2388. | |||||||||||||||||||||
| Additional Information Phone Number | 888-522-2388 | |||||||||||||||||||||
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.lordabbett.com/seriesfunds</span> | |||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||
| Expenses Paid, Amount | $ 61 | |||||||||||||||||||||
| Expense Ratio, Percent | 1.04% | [2] | ||||||||||||||||||||
| AssetsNet | $ 79,448,007 | |||||||||||||||||||||
| Holdings Count | Holding | 96 | |||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 56.00% | |||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||
| C000020054 | ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Fund Name | Lord Abbett Dividend Growth Portfolio | |||||||||||||||||||||
| Class Name | Class VC | |||||||||||||||||||||
| No Trading Symbol [Flag] | true | |||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Dividend Growth Portfolio for the period of January 1, 2026 to June 30, 2026 (the "reporting period"). | |||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.lordabbett.com/seriesfunds. You can also request this information by contacting us at 888-522-2388. | |||||||||||||||||||||
| Additional Information Phone Number | 888-522-2388 | |||||||||||||||||||||
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.lordabbett.com/seriesfunds</span> | |||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||
| Expenses Paid, Amount | $ 51 | |||||||||||||||||||||
| Expense Ratio, Percent | 0.99% | [3] | ||||||||||||||||||||
| AssetsNet | $ 200,915,792 | |||||||||||||||||||||
| Holdings Count | Holding | 51 | |||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 20.00% | |||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||
| C000020053 | ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Fund Name | Lord Abbett Fundamental Equity Portfolio | |||||||||||||||||||||
| Class Name | Class VC | |||||||||||||||||||||
| No Trading Symbol [Flag] | true | |||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Fundamental Equity Portfolio for the period of January 1, 2026 to June 30, 2026 (the "reporting period"). | |||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.lordabbett.com/seriesfunds. You can also request this information by contacting us at 888-522-2388. | |||||||||||||||||||||
| Additional Information Phone Number | 888-522-2388 | |||||||||||||||||||||
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.lordabbett.com/seriesfunds</span> | |||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||
| Expenses Paid, Amount | $ 57 | |||||||||||||||||||||
| Expense Ratio, Percent | 1.08% | [4] | ||||||||||||||||||||
| AssetsNet | $ 212,528,738 | |||||||||||||||||||||
| Holdings Count | Holding | 57 | |||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 31.00% | |||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||
| C000020056 | ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Fund Name | Lord Abbett Growth and Income Portfolio | |||||||||||||||||||||
| Class Name | Class VC | |||||||||||||||||||||
| No Trading Symbol [Flag] | true | |||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Growth and Income Portfolio for the period of January 1, 2026 to June 30, 2026 (the "reporting period"). | |||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.lordabbett.com/seriesfunds. You can also request this information by contacting us at 888-522-2388. | |||||||||||||||||||||
| Additional Information Phone Number | 888-522-2388 | |||||||||||||||||||||
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.lordabbett.com/seriesfunds</span> | |||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||
| Expenses Paid, Amount | $ 47 | |||||||||||||||||||||
| Expense Ratio, Percent | 0.93% | [5] | ||||||||||||||||||||
| AssetsNet | $ 492,495,687 | |||||||||||||||||||||
| Holdings Count | Holding | 58 | |||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 26.00% | |||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||
| C000020057 | ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Fund Name | Lord Abbett Growth Opportunities Portfolio | |||||||||||||||||||||
| Class Name | Class VC | |||||||||||||||||||||
| No Trading Symbol [Flag] | true | |||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Growth Opportunities Portfolio for the period of January 1, 2026 to June 30, 2026 (the "reporting period"). | |||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.lordabbett.com/seriesfunds. You can also request this information by contacting us at 888-522-2388. | |||||||||||||||||||||
| Additional Information Phone Number | 888-522-2388 | |||||||||||||||||||||
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.lordabbett.com/seriesfunds</span> | |||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||
| Expenses Paid, Amount | $ 62 | |||||||||||||||||||||
| Expense Ratio, Percent | 1.13% | [6] | ||||||||||||||||||||
| AssetsNet | $ 84,885,384 | |||||||||||||||||||||
| Holdings Count | Holding | 80 | |||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 68.00% | |||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||
| C000020060 | ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Fund Name | Lord Abbett Mid Cap Stock Portfolio | |||||||||||||||||||||
| Class Name | Class VC | |||||||||||||||||||||
| No Trading Symbol [Flag] | true | |||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Mid Cap Stock Portfolio for the period of January 1, 2026 to June 30, 2026 (the "reporting period"). | |||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.lordabbett.com/seriesfunds. You can also request this information by contacting us at 888-522-2388. | |||||||||||||||||||||
| Additional Information Phone Number | 888-522-2388 | |||||||||||||||||||||
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.lordabbett.com/seriesfunds</span> | |||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||
| Expenses Paid, Amount | $ 60 | |||||||||||||||||||||
| Expense Ratio, Percent | 1.14% | [7] | ||||||||||||||||||||
| AssetsNet | $ 256,432,158 | |||||||||||||||||||||
| Holdings Count | Holding | 61 | |||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 39.00% | |||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||
| C000272081 | ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Fund Name | Lord Abbett Short Duration Income Portfolio | |||||||||||||||||||||
| Class Name | Class I | |||||||||||||||||||||
| No Trading Symbol [Flag] | true | |||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Portfolio for the period of May 1, 2026 to June 30, 2026 (the "reporting period"). | |||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.lordabbett.com/seriesfunds. You can also request this information by contacting us at 888-522-2388. | |||||||||||||||||||||
| Additional Information Phone Number | 888-522-2388 | |||||||||||||||||||||
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.lordabbett.com/seriesfunds</span> | |||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||
| Expenses Paid, Amount | $ 7 | |||||||||||||||||||||
| Expense Ratio, Percent | 0.42% | [8] | ||||||||||||||||||||
| AssetsNet | $ 167,980,316 | |||||||||||||||||||||
| Holdings Count | Holding | 841 | |||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 84.00% | |||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||
| C000139705 | ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Fund Name | Lord Abbett Short Duration Income Portfolio | |||||||||||||||||||||
| Class Name | Class VC | |||||||||||||||||||||
| No Trading Symbol [Flag] | true | |||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Short Duration Income Portfolio for the period of January 1, 2026 to June 30, 2026 (the "reporting period"). | |||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.lordabbett.com/seriesfunds. You can also request this information by contacting us at 888-522-2388. | |||||||||||||||||||||
| Additional Information Phone Number | 888-522-2388 | |||||||||||||||||||||
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.lordabbett.com/seriesfunds</span> | |||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||
| Expenses Paid, Amount | $ 39 | |||||||||||||||||||||
| Expense Ratio, Percent | 0.78% | [9] | ||||||||||||||||||||
| AssetsNet | $ 167,980,316 | |||||||||||||||||||||
| Holdings Count | Holding | 841 | |||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 84.00% | |||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||
| C000087852 | ||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||
| Fund Name | Lord Abbett Total Return Portfolio | |||||||||||||||||||||
| Class Name | Class VC | |||||||||||||||||||||
| No Trading Symbol [Flag] | true | |||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Total Return Portfolio for the period of January 1, 2026 to June 30, 2026 (the "reporting period"). | |||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at www.lordabbett.com/seriesfunds. You can also request this information by contacting us at 888-522-2388. | |||||||||||||||||||||
| Additional Information Phone Number | 888-522-2388 | |||||||||||||||||||||
| Additional Information Website | <span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; text-align-last: auto; white-space-collapse: preserve-breaks;">www.lordabbett.com/seriesfunds</span> | |||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||
| Expenses Paid, Amount | $ 35 | |||||||||||||||||||||
| Expense Ratio, Percent | 0.70% | [10] | ||||||||||||||||||||
| AssetsNet | $ 657,753,340 | |||||||||||||||||||||
| Holdings Count | Holding | 567 | |||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 200.00% | |||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||
| ||||||||||||||||||||||