Shareholder Report |
6 Months Ended | |||||||||||||||||||||||
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Apr. 30, 2026
USD ($)
Holding
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| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Document Type | N-CSRS | |||||||||||||||||||||||
| Amendment Flag | false | |||||||||||||||||||||||
| Registrant Name | LORD ABBETT AFFILIATED FUND INC | |||||||||||||||||||||||
| Entity Central Index Key | 0000002691 | |||||||||||||||||||||||
| Entity Investment Company Type | N-1A | |||||||||||||||||||||||
| Document Period End Date | Apr. 30, 2026 | |||||||||||||||||||||||
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report | |||||||||||||||||||||||
| C000018428 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Lord Abbett Affiliated Fund Inc. | |||||||||||||||||||||||
| Class Name | Class A | |||||||||||||||||||||||
| Trading Symbol | LAFFX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Affiliated Fund Inc. for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at lordabbett.com/FundDocuments. 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;">lordabbett.com/FundDocuments</span> | |||||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||||
| Expenses Paid, Amount | $ 36 | |||||||||||||||||||||||
| Expense Ratio, Percent | 0.68% | [1] | ||||||||||||||||||||||
| AssetsNet | $ 6,724,158,102 | |||||||||||||||||||||||
| Holdings Count | Holding | 67 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 24.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||||
| C000018430 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Lord Abbett Affiliated Fund Inc. | |||||||||||||||||||||||
| Class Name | Class C | |||||||||||||||||||||||
| Trading Symbol | LAFCX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Affiliated Fund Inc. for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at lordabbett.com/FundDocuments. 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;">lordabbett.com/FundDocuments</span> | |||||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||||
| Expenses Paid, Amount | $ 75 | |||||||||||||||||||||||
| Expense Ratio, Percent | 1.43% | [2] | ||||||||||||||||||||||
| AssetsNet | $ 6,724,158,102 | |||||||||||||||||||||||
| Holdings Count | Holding | 67 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 24.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||||
| C000054699 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Lord Abbett Affiliated Fund Inc. | |||||||||||||||||||||||
| Class Name | Class F | |||||||||||||||||||||||
| Trading Symbol | LAAFX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Affiliated Fund Inc. for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at lordabbett.com/FundDocuments. 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;">lordabbett.com/FundDocuments</span> | |||||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||||
| Expenses Paid, Amount | $ 28 | |||||||||||||||||||||||
| Expense Ratio, Percent | 0.53% | [3] | ||||||||||||||||||||||
| AssetsNet | $ 6,724,158,102 | |||||||||||||||||||||||
| Holdings Count | Holding | 67 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 24.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||||
| C000184551 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Lord Abbett Affiliated Fund Inc. | |||||||||||||||||||||||
| Class Name | Class F3 | |||||||||||||||||||||||
| Trading Symbol | LTFOX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Affiliated Fund Inc. for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at lordabbett.com/FundDocuments. 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;">lordabbett.com/FundDocuments</span> | |||||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||||
| Expenses Paid, Amount | $ 20 | |||||||||||||||||||||||
| Expense Ratio, Percent | 0.38% | [4] | ||||||||||||||||||||||
| AssetsNet | $ 6,724,158,102 | |||||||||||||||||||||||
| Holdings Count | Holding | 67 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 24.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||||
| C000018432 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Lord Abbett Affiliated Fund Inc. | |||||||||||||||||||||||
| Class Name | Class I | |||||||||||||||||||||||
| Trading Symbol | LAFYX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Affiliated Fund Inc. for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at lordabbett.com/FundDocuments. 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;">lordabbett.com/FundDocuments</span> | |||||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||||
| Expenses Paid, Amount | $ 23 | |||||||||||||||||||||||
| Expense Ratio, Percent | 0.43% | [5] | ||||||||||||||||||||||
| AssetsNet | $ 6,724,158,102 | |||||||||||||||||||||||
| Holdings Count | Holding | 67 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 24.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||||
| C000018431 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Lord Abbett Affiliated Fund Inc. | |||||||||||||||||||||||
| Class Name | Class P | |||||||||||||||||||||||
| Trading Symbol | LAFPX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Affiliated Fund Inc. for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at lordabbett.com/FundDocuments. 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;">lordabbett.com/FundDocuments</span> | |||||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||||
| Expenses Paid, Amount | $ 46 | |||||||||||||||||||||||
| Expense Ratio, Percent | 0.88% | [6] | ||||||||||||||||||||||
| AssetsNet | $ 6,724,158,102 | |||||||||||||||||||||||
| Holdings Count | Holding | 67 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 24.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||||
| C000054700 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Lord Abbett Affiliated Fund Inc. | |||||||||||||||||||||||
| Class Name | Class R2 | |||||||||||||||||||||||
| Trading Symbol | LAFQX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Affiliated Fund Inc. for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at lordabbett.com/FundDocuments. 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;">lordabbett.com/FundDocuments</span> | |||||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||||
| Expenses Paid, Amount | $ 54 | |||||||||||||||||||||||
| Expense Ratio, Percent | 1.03% | [7] | ||||||||||||||||||||||
| AssetsNet | $ 6,724,158,102 | |||||||||||||||||||||||
| Holdings Count | Holding | 67 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 24.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||||
| C000054701 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Lord Abbett Affiliated Fund Inc. | |||||||||||||||||||||||
| Class Name | Class R3 | |||||||||||||||||||||||
| Trading Symbol | LAFRX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Affiliated Fund Inc. for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at lordabbett.com/FundDocuments. 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;">lordabbett.com/FundDocuments</span> | |||||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||||
| Expenses Paid, Amount | $ 49 | |||||||||||||||||||||||
| Expense Ratio, Percent | 0.93% | [8] | ||||||||||||||||||||||
| AssetsNet | $ 6,724,158,102 | |||||||||||||||||||||||
| Holdings Count | Holding | 67 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 24.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||||
| C000155435 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Lord Abbett Affiliated Fund Inc. | |||||||||||||||||||||||
| Class Name | Class R4 | |||||||||||||||||||||||
| Trading Symbol | LAFSX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Affiliated Fund Inc. for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at lordabbett.com/FundDocuments. 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;">lordabbett.com/FundDocuments</span> | |||||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||||
| Expenses Paid, Amount | $ 36 | |||||||||||||||||||||||
| Expense Ratio, Percent | 0.68% | [9] | ||||||||||||||||||||||
| AssetsNet | $ 6,724,158,102 | |||||||||||||||||||||||
| Holdings Count | Holding | 67 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 24.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||||
| C000155436 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Lord Abbett Affiliated Fund Inc. | |||||||||||||||||||||||
| Class Name | Class R5 | |||||||||||||||||||||||
| Trading Symbol | LAFTX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Affiliated Fund Inc. for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at lordabbett.com/FundDocuments. 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;">lordabbett.com/FundDocuments</span> | |||||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||||
| Expenses Paid, Amount | $ 23 | |||||||||||||||||||||||
| Expense Ratio, Percent | 0.43% | [10] | ||||||||||||||||||||||
| AssetsNet | $ 6,724,158,102 | |||||||||||||||||||||||
| Holdings Count | Holding | 67 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 24.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||||
| C000155437 | ||||||||||||||||||||||||
| Shareholder Report [Line Items] | ||||||||||||||||||||||||
| Fund Name | Lord Abbett Affiliated Fund Inc. | |||||||||||||||||||||||
| Class Name | Class R6 | |||||||||||||||||||||||
| Trading Symbol | LAFVX | |||||||||||||||||||||||
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the Lord Abbett Affiliated Fund Inc. for the period of November 1, 2025 to April 30, 2026. | |||||||||||||||||||||||
| Additional Information [Text Block] | You can find additional information about the Fund at lordabbett.com/FundDocuments. 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;">lordabbett.com/FundDocuments</span> | |||||||||||||||||||||||
| Expenses [Text Block] | ||||||||||||||||||||||||
| Expenses Paid, Amount | $ 20 | |||||||||||||||||||||||
| Expense Ratio, Percent | 0.38% | [11] | ||||||||||||||||||||||
| AssetsNet | $ 6,724,158,102 | |||||||||||||||||||||||
| Holdings Count | Holding | 67 | |||||||||||||||||||||||
| InvestmentCompanyPortfolioTurnover | 24.00% | |||||||||||||||||||||||
| Additional Fund Statistics [Text Block] | ||||||||||||||||||||||||
| Holdings [Text Block] | ||||||||||||||||||||||||
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