| Form N-CSR Cover | 6 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Fidelity Aberdeen Street Trust |
| Entity Central Index Key | 0000880195 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 6 Months Ended |
| Sep. 30, 2024 USD ($) shares | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Fidelity Aberdeen Street Trust |
| Entity Central Index Key | 0000880195 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Fidelity Freedom Index 2050 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2050 Fund |
| Class Name | Fidelity Freedom® Index 2050 Fund Premier II Class |
| Trading Symbol | FAVQX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2050 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 19,727,473,878 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 7% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 7 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2055 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2055 Fund |
| Class Name | Fidelity Freedom® Index 2055 Fund Premier II Class |
| Trading Symbol | FAVRX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2055 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 14,448,762,506 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 6% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 6 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2065 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2065 Fund |
| Class Name | Fidelity Freedom® Index 2065 Fund Premier II Class |
| Trading Symbol | FAVVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2065 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 2,413,130,862 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 4% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 4 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2045 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2045 Fund |
| Class Name | Fidelity Freedom® Index 2045 Fund Premier II Class |
| Trading Symbol | FAVPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2045 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 20,629,221,628 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 8 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2040 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2040 Fund |
| Class Name | Fidelity Freedom® Index 2040 Fund Premier II Class |
| Trading Symbol | FAVOX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2040 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 23,405,059,072 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 9% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 9 % |
| Holdings [Text Block] | Domestic Equity Funds 50.2 International Equity Funds 33.3 Bond Funds 16.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 50.2 Fidelity Series Global ex U.S. Index Fund 33.3 Fidelity Series Bond Index Fund 9.4 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series International Developed Markets Bond Index Fund 2.1 100.0 |
| Fidelity Freedom Index 2070 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2070 Fund |
| Class Name | Fidelity Freedom® Index 2070 Fund Premier II Class |
| Trading Symbol | FAVWX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2070 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 2,518,147 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 0% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover B 0 % A A Amount represents less than 1% B Amount not annualized |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2010 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2010 Fund |
| Class Name | Fidelity Freedom® Index 2010 Fund Premier II Class |
| Trading Symbol | FATUX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2010 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 733,849,570 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 14 % |
| Holdings [Text Block] | Bond Funds 65.8 Domestic Equity Funds 15.7 International Equity Funds 10.4 Short-Term Funds 8.1 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 40.2 Fidelity Series Total Market Index Fund 15.7 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 15.4 Fidelity Series Global ex U.S. Index Fund 10.4 Fidelity Series Treasury Bill Index Fund 8.1 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series Long-Term Treasury Bond Index Fund 3.2 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 2.1 100.0 |
| Fidelity Freedom Index 2035 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2035 Fund |
| Class Name | Fidelity Freedom® Index 2035 Fund Premier II Class |
| Trading Symbol | FAVNX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2035 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 22,859,083,179 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 11 % |
| Holdings [Text Block] | Domestic Equity Funds 41.7 Bond Funds 30.8 International Equity Funds 27.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 41.7 Fidelity Series Global ex U.S. Index Fund 27.5 Fidelity Series Bond Index Fund 20.7 Fidelity Series Long-Term Treasury Bond Index Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.2 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 1.0 100.0 |
| Fidelity Freedom Index Income Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index Income Fund |
| Class Name | Fidelity Freedom® Index Income Fund Premier II Class |
| Trading Symbol | FATQX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index Income Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 1,681,067,537 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 14 % |
| Holdings [Text Block] | Bond Funds 70.9 Domestic Equity Funds 11.5 Short-Term Funds 10.0 International Equity Funds 7.6 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 43.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 19.9 Fidelity Series Total Market Index Fund 11.5 Fidelity Series Treasury Bill Index Fund 10.0 Fidelity Series Global ex U.S. Index Fund 7.6 Fidelity Series International Developed Markets Bond Index Fund 5.0 Fidelity Series Long-Term Treasury Bond Index Fund 3.0 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 0.0 100.0 |
| Fidelity Freedom Index 2060 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2060 Fund |
| Class Name | Fidelity Freedom® Index 2060 Fund Premier II Class |
| Trading Symbol | FAVUX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2060 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 8,047,655,750 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 5% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 5 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2030 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2030 Fund |
| Class Name | Fidelity Freedom® Index 2030 Fund Premier II Class |
| Trading Symbol | FAUYX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2030 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 22,274,558,937 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 10% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 10 % |
| Holdings [Text Block] | Bond Funds 41.0 Domestic Equity Funds 35.5 International Equity Funds 23.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 35.5 Fidelity Series Bond Index Fund 26.5 Fidelity Series Global ex U.S. Index Fund 23.5 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 5.2 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.5 100.0 |
| Fidelity Freedom Index 2015 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2015 Fund |
| Class Name | Fidelity Freedom® Index 2015 Fund Premier II Class |
| Trading Symbol | FATVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2015 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 2,055,460,161 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 59.6 Domestic Equity Funds 21.2 International Equity Funds 14.0 Short-Term Funds 5.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 36.7 Fidelity Series Total Market Index Fund 21.2 Fidelity Series Global ex U.S. Index Fund 14.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 9.8 Fidelity Series Treasury Bill Index Fund 5.2 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 4.7 Fidelity Series Long-Term Treasury Bond Index Fund 3.5 100.0 |
| Fidelity Freedom Index 2025 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2025 Fund |
| Class Name | Fidelity Freedom® Index 2025 Fund Premier II Class |
| Trading Symbol | FATZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2025 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 14,699,618,165 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 8 % |
| Holdings [Text Block] | Bond Funds 47.5 Domestic Equity Funds 31.6 International Equity Funds 20.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 31.6 Fidelity Series Bond Index Fund 29.2 Fidelity Series Global ex U.S. Index Fund 20.9 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 9.3 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series Long-Term Treasury Bond Index Fund 4.1 100.0 |
| Fidelity Freedom Index 2020 Fund - Premier II Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2020 Fund |
| Class Name | Fidelity Freedom® Index 2020 Fund Premier II Class |
| Trading Symbol | FATYX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2020 Fund for the period August 22, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier II Class A $ B 0.04 % A Expenses for the full reporting period would be higher. B Amount represents less than $.50 |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0.04% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 7,157,854,253 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 8 % |
| Holdings [Text Block] | Bond Funds 53.3 Domestic Equity Funds 26.7 International Equity Funds 17.7 Short-Term Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 33.1 Fidelity Series Total Market Index Fund 26.7 Fidelity Series Global ex U.S. Index Fund 17.7 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 7.3 Fidelity Series International Developed Markets Bond Index Fund 5.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 4.2 Fidelity Series Long-Term Treasury Bond Index Fund 3.7 Fidelity Series Treasury Bill Index Fund 2.3 100.0 |
| Fidelity Freedom Index 2030 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2030 Fund |
| Class Name | Fidelity Freedom® Index 2030 Fund Institutional Premium Class |
| Trading Symbol | FFEGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2030 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 22,274,558,937 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 10% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 10 % |
| Holdings [Text Block] | Bond Funds 41.0 Domestic Equity Funds 35.5 International Equity Funds 23.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 35.5 Fidelity Series Bond Index Fund 26.5 Fidelity Series Global ex U.S. Index Fund 23.5 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 5.2 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.5 100.0 |
| Fidelity Flex Freedom Blend 2040 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2040 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2040 Fund |
| Trading Symbol | FCLSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2040 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2040 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 69,470,313 |
| Holdings Count | shares | 30 |
| Investment Company Portfolio Turnover | 38% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 30 Portfolio Turnover 38 % |
| Holdings [Text Block] | Domestic Equity Funds 47.6 International Equity Funds 39.2 Bond Funds 13.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 13.3 Fidelity Series Blue Chip Growth Fund 10.9 Fidelity Series Emerging Markets Opportunities Fund 10.5 Fidelity Series Long-Term Treasury Bond Index Fund 7.3 Fidelity Series Large Cap Growth Index Fund 7.1 Fidelity Series International Value Fund 6.5 Fidelity Series Overseas Fund 6.5 Fidelity Series International Growth Fund 6.5 Fidelity Series Large Cap Stock Fund 6.4 Fidelity Series Value Discovery Fund 4.6 79.6 |
| Fidelity Freedom Index 2015 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2015 Fund |
| Class Name | Fidelity Freedom® Index 2015 Fund Investor Class |
| Trading Symbol | FLIFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2015 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 2,055,460,161 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 59.6 Domestic Equity Funds 21.2 International Equity Funds 14.0 Short-Term Funds 5.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 36.7 Fidelity Series Total Market Index Fund 21.2 Fidelity Series Global ex U.S. Index Fund 14.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 9.8 Fidelity Series Treasury Bill Index Fund 5.2 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 4.7 Fidelity Series Long-Term Treasury Bond Index Fund 3.5 100.0 |
| Fidelity Flex Freedom Blend 2045 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2045 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2045 Fund |
| Trading Symbol | FOLSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2045 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2045 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 74,664,722 |
| Holdings Count | shares | 28 |
| Investment Company Portfolio Turnover | 26% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 28 Portfolio Turnover 26 % |
| Holdings [Text Block] | Domestic Equity Funds 51.0 International Equity Funds 41.9 Bond Funds 7.1 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.2 Fidelity Series Blue Chip Growth Fund 11.7 Fidelity Series Emerging Markets Opportunities Fund 11.1 Fidelity Series Large Cap Growth Index Fund 7.6 Fidelity Series International Value Fund 7.0 Fidelity Series Overseas Fund 7.0 Fidelity Series International Growth Fund 7.0 Fidelity Series Large Cap Stock Fund 6.8 Fidelity Series Long-Term Treasury Bond Index Fund 5.5 Fidelity Series Value Discovery Fund 4.9 82.8 |
| Fidelity Freedom Index 2070 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2070 Fund |
| Class Name | Fidelity Freedom® Index 2070 Fund Investor Class |
| Trading Symbol | FRBVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2070 Fund for the period June 28, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class A $ 0.12 % A Expenses for the full reporting period would be higher. |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.12% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 2,518,147 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 0% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover B 0 % A A Amount represents less than 1% B Amount not annualized |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2020 Fund |
| Class Name | Fidelity Freedom® Index 2020 Fund Institutional Premium Class |
| Trading Symbol | FIWTX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2020 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 7,157,854,253 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 8 % |
| Holdings [Text Block] | Bond Funds 53.3 Domestic Equity Funds 26.7 International Equity Funds 17.7 Short-Term Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 33.1 Fidelity Series Total Market Index Fund 26.7 Fidelity Series Global ex U.S. Index Fund 17.7 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 7.3 Fidelity Series International Developed Markets Bond Index Fund 5.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 4.2 Fidelity Series Long-Term Treasury Bond Index Fund 3.7 Fidelity Series Treasury Bill Index Fund 2.3 100.0 |
| Fidelity Freedom Index 2020 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2020 Fund |
| Class Name | Fidelity Freedom® Index 2020 Fund Investor Class |
| Trading Symbol | FPIFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2020 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 7,157,854,253 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 8 % |
| Holdings [Text Block] | Bond Funds 53.3 Domestic Equity Funds 26.7 International Equity Funds 17.7 Short-Term Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 33.1 Fidelity Series Total Market Index Fund 26.7 Fidelity Series Global ex U.S. Index Fund 17.7 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 7.3 Fidelity Series International Developed Markets Bond Index Fund 5.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 4.2 Fidelity Series Long-Term Treasury Bond Index Fund 3.7 Fidelity Series Treasury Bill Index Fund 2.3 100.0 |
| Fidelity Freedom Index 2055 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2055 Fund |
| Class Name | Fidelity Freedom® Index 2055 Fund Institutional Premium Class |
| Trading Symbol | FFLDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2055 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 14,448,762,506 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 6% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 6 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2060 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2060 Fund |
| Class Name | Fidelity Freedom® Index 2060 Fund Investor Class |
| Trading Symbol | FDKLX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2060 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 8,047,655,750 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 5% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 5 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2065 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2065 Fund |
| Class Name | Fidelity Freedom® Index 2065 Fund Institutional Premium Class |
| Trading Symbol | FFIKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2065 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 2,413,130,862 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 4% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 4 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Flex Freedom Blend 2010 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2010 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2010 Fund |
| Trading Symbol | FISNX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2010 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2010 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 2,638,576 |
| Holdings Count | shares | 33 |
| Investment Company Portfolio Turnover | 25% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 33 Portfolio Turnover 25 % |
| Holdings [Text Block] | Bond Funds 67.3 International Equity Funds 16.4 Domestic Equity Funds 12.9 Short-Term Funds 3.4 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 16.2 Fidelity Series Government Bond Index Fund 12.5 Fidelity Series Investment Grade Bond Fund 12.0 Fidelity Series Corporate Bond Fund 7.9 Fidelity Series Investment Grade Securitized Fund 7.7 Fidelity Series Emerging Markets Opportunities Fund 5.0 Fidelity Series International Developed Markets Bond Index Fund 4.0 Fidelity Series Large Cap Value Index Fund 3.6 Fidelity Series Blue Chip Growth Fund 3.0 Fidelity Series Long-Term Treasury Bond Index Fund 2.9 74.8 |
| Fidelity Freedom Index 2035 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2035 Fund |
| Class Name | Fidelity Freedom® Index 2035 Fund Institutional Premium Class |
| Trading Symbol | FFEZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2035 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 22,859,083,179 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 11 % |
| Holdings [Text Block] | Domestic Equity Funds 41.7 Bond Funds 30.8 International Equity Funds 27.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 41.7 Fidelity Series Global ex U.S. Index Fund 27.5 Fidelity Series Bond Index Fund 20.7 Fidelity Series Long-Term Treasury Bond Index Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.2 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 1.0 100.0 |
| Fidelity Flex Freedom Blend 2070 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2070 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2070 Fund |
| Trading Symbol | FRBQX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2070 Fund for the period June 28, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2070 Fund A $ B 0.00 % C A Expenses for the full reporting period would be higher. B Amount represents less than $.50 C Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 2,034,592 |
| Holdings Count | shares | 26 |
| Investment Company Portfolio Turnover | 7% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 26 Portfolio Turnover A 7 % A Amount not annualized |
| Holdings [Text Block] | Domestic Equity Funds 51.0 International Equity Funds 41.9 Bond Funds 7.1 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.2 Fidelity Series Blue Chip Growth Fund 11.7 Fidelity Series Emerging Markets Opportunities Fund 11.1 Fidelity Series Large Cap Growth Index Fund 7.6 Fidelity Series International Value Fund 7.0 Fidelity Series Overseas Fund 7.0 Fidelity Series International Growth Fund 7.0 Fidelity Series Large Cap Stock Fund 6.8 Fidelity Series Long-Term Treasury Bond Index Fund 5.5 Fidelity Series Value Discovery Fund 4.9 82.8 |
| Fidelity Freedom Index 2065 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2065 Fund |
| Class Name | Fidelity Freedom® Index 2065 Fund Premier Class |
| Trading Symbol | FVIPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2065 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 2,413,130,862 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 4% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 4 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2045 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2045 Fund |
| Class Name | Fidelity Freedom® Index 2045 Fund Investor Class |
| Trading Symbol | FIOFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2045 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 20,629,221,628 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 8 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2030 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2030 Fund |
| Class Name | Fidelity Freedom® Index 2030 Fund Investor Class |
| Trading Symbol | FXIFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2030 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 22,274,558,937 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 10% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 10 % |
| Holdings [Text Block] | Bond Funds 41.0 Domestic Equity Funds 35.5 International Equity Funds 23.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 35.5 Fidelity Series Bond Index Fund 26.5 Fidelity Series Global ex U.S. Index Fund 23.5 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 5.2 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.5 100.0 |
| Fidelity Freedom Index 2040 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2040 Fund |
| Class Name | Fidelity Freedom® Index 2040 Fund Investor Class |
| Trading Symbol | FBIFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2040 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 23,405,059,072 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 9% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 9 % |
| Holdings [Text Block] | Domestic Equity Funds 50.2 International Equity Funds 33.3 Bond Funds 16.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 50.2 Fidelity Series Global ex U.S. Index Fund 33.3 Fidelity Series Bond Index Fund 9.4 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series International Developed Markets Bond Index Fund 2.1 100.0 |
| Fidelity Freedom Index 2045 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2045 Fund |
| Class Name | Fidelity Freedom® Index 2045 Fund Institutional Premium Class |
| Trading Symbol | FFOLX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2045 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 20,629,221,628 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 8 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2010 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2010 Fund |
| Class Name | Fidelity Freedom® Index 2010 Fund Investor Class |
| Trading Symbol | FKIFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2010 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 733,849,570 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 14 % |
| Holdings [Text Block] | Bond Funds 65.8 Domestic Equity Funds 15.7 International Equity Funds 10.4 Short-Term Funds 8.1 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 40.2 Fidelity Series Total Market Index Fund 15.7 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 15.4 Fidelity Series Global ex U.S. Index Fund 10.4 Fidelity Series Treasury Bill Index Fund 8.1 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series Long-Term Treasury Bond Index Fund 3.2 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 2.1 100.0 |
| Fidelity Flex Freedom Blend 2020 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2020 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2020 Fund |
| Trading Symbol | FULSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2020 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2020 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 30,455,366 |
| Holdings Count | shares | 32 |
| Investment Company Portfolio Turnover | 23% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 32 Portfolio Turnover 23 % |
| Holdings [Text Block] | Bond Funds 52.2 Domestic Equity Funds 23.9 International Equity Funds 23.7 Short-Term Funds 0.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Government Bond Index Fund 9.0 Fidelity Series Investment Grade Bond Fund 8.7 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 7.9 Fidelity Series Emerging Markets Opportunities Fund 6.8 Fidelity Series Large Cap Value Index Fund 6.7 Fidelity Series Corporate Bond Fund 5.8 Fidelity Series Investment Grade Securitized Fund 5.6 Fidelity Series Blue Chip Growth Fund 5.5 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 5.0 Fidelity Series Long-Term Treasury Bond Index Fund 4.8 65.8 |
| Fidelity Freedom Index 2040 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2040 Fund |
| Class Name | Fidelity Freedom® Index 2040 Fund Institutional Premium Class |
| Trading Symbol | FFIZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2040 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 23,405,059,072 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 9% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 9 % |
| Holdings [Text Block] | Domestic Equity Funds 50.2 International Equity Funds 33.3 Bond Funds 16.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 50.2 Fidelity Series Global ex U.S. Index Fund 33.3 Fidelity Series Bond Index Fund 9.4 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series International Developed Markets Bond Index Fund 2.1 100.0 |
| Fidelity Freedom Index 2060 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2060 Fund |
| Class Name | Fidelity Freedom® Index 2060 Fund Premier Class |
| Trading Symbol | FUIPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2060 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 8,047,655,750 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 5% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 5 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Flex Freedom Blend Income Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend Income Fund |
| Class Name | Fidelity Flex® Freedom Blend Income Fund |
| Trading Symbol | FTLSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend Income Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend Income Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 3,845,593 |
| Holdings Count | shares | 33 |
| Investment Company Portfolio Turnover | 25% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 33 Portfolio Turnover 25 % |
| Holdings [Text Block] | Bond Funds 72.4 International Equity Funds 13.6 Domestic Equity Funds 8.7 Short-Term Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.7 Fidelity Series Government Bond Index Fund 13.3 Fidelity Series Investment Grade Bond Fund 12.9 Fidelity Series Corporate Bond Fund 8.5 Fidelity Series Investment Grade Securitized Fund 8.3 Fidelity Series Emerging Markets Opportunities Fund 4.4 Fidelity Series International Developed Markets Bond Index Fund 4.0 Fidelity Series Treasury Bill Index Fund 3.2 Fidelity Series Long-Term Treasury Bond Index Fund 2.7 Fidelity Series Large Cap Value Index Fund 2.4 80.4 |
| Fidelity Freedom Index 2035 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2035 Fund |
| Class Name | Fidelity Freedom® Index 2035 Fund Investor Class |
| Trading Symbol | FIHFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2035 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 22,859,083,179 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 11 % |
| Holdings [Text Block] | Domestic Equity Funds 41.7 Bond Funds 30.8 International Equity Funds 27.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 41.7 Fidelity Series Global ex U.S. Index Fund 27.5 Fidelity Series Bond Index Fund 20.7 Fidelity Series Long-Term Treasury Bond Index Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.2 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 1.0 100.0 |
| Fidelity Freedom Index Income Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index Income Fund |
| Class Name | Fidelity Freedom® Index Income Fund Investor Class |
| Trading Symbol | FIKFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index Income Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 1,681,067,537 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 14 % |
| Holdings [Text Block] | Bond Funds 70.9 Domestic Equity Funds 11.5 Short-Term Funds 10.0 International Equity Funds 7.6 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 43.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 19.9 Fidelity Series Total Market Index Fund 11.5 Fidelity Series Treasury Bill Index Fund 10.0 Fidelity Series Global ex U.S. Index Fund 7.6 Fidelity Series International Developed Markets Bond Index Fund 5.0 Fidelity Series Long-Term Treasury Bond Index Fund 3.0 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 0.0 100.0 |
| Fidelity Flex Freedom Blend 2035 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2035 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2035 Fund |
| Trading Symbol | FJLSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2035 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2035 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 84,600,359 |
| Holdings Count | shares | 40 |
| Investment Company Portfolio Turnover | 30% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 40 Portfolio Turnover 30 % |
| Holdings [Text Block] | Domestic Equity Funds 40.0 International Equity Funds 33.0 Bond Funds 26.7 Short-Term Funds 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 11.2 Fidelity Series Blue Chip Growth Fund 9.2 Fidelity Series Emerging Markets Opportunities Fund 8.7 Fidelity Series Large Cap Growth Index Fund 5.9 Fidelity Series International Value Fund 5.4 Fidelity Series Overseas Fund 5.4 Fidelity Series International Growth Fund 5.4 Fidelity Series Large Cap Stock Fund 5.4 Fidelity Series Government Bond Index Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.7 66.1 |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index Income Fund |
| Class Name | Fidelity Freedom® Index Income Fund Institutional Premium Class |
| Trading Symbol | FFGZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index Income Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 1,681,067,537 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 14 % |
| Holdings [Text Block] | Bond Funds 70.9 Domestic Equity Funds 11.5 Short-Term Funds 10.0 International Equity Funds 7.6 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 43.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 19.9 Fidelity Series Total Market Index Fund 11.5 Fidelity Series Treasury Bill Index Fund 10.0 Fidelity Series Global ex U.S. Index Fund 7.6 Fidelity Series International Developed Markets Bond Index Fund 5.0 Fidelity Series Long-Term Treasury Bond Index Fund 3.0 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 0.0 100.0 |
| Fidelity Freedom Index 2010 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2010 Fund |
| Class Name | Fidelity Freedom® Index 2010 Fund Premier Class |
| Trading Symbol | FCYPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2010 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 733,849,570 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 14 % |
| Holdings [Text Block] | Bond Funds 65.8 Domestic Equity Funds 15.7 International Equity Funds 10.4 Short-Term Funds 8.1 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 40.2 Fidelity Series Total Market Index Fund 15.7 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 15.4 Fidelity Series Global ex U.S. Index Fund 10.4 Fidelity Series Treasury Bill Index Fund 8.1 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series Long-Term Treasury Bond Index Fund 3.2 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 2.1 100.0 |
| Fidelity Freedom Index 2045 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2045 Fund |
| Class Name | Fidelity Freedom® Index 2045 Fund Premier Class |
| Trading Symbol | FQIPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2045 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 20,629,221,628 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 8 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Flex Freedom Blend 2025 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2025 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2025 Fund |
| Trading Symbol | FELSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2025 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2025 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 48,550,715 |
| Holdings Count | shares | 30 |
| Investment Company Portfolio Turnover | 30% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 30 Portfolio Turnover 30 % |
| Holdings [Text Block] | Bond Funds 44.3 Domestic Equity Funds 28.8 International Equity Funds 26.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 10.0 Fidelity Series Large Cap Value Index Fund 8.0 Fidelity Series Emerging Markets Opportunities Fund 7.5 Fidelity Series Government Bond Index Fund 6.8 Fidelity Series Blue Chip Growth Fund 6.6 Fidelity Series Investment Grade Bond Fund 6.5 Fidelity Series Long-Term Treasury Bond Index Fund 6.5 Fidelity Series Corporate Bond Fund 4.3 Fidelity Series Large Cap Growth Index Fund 4.3 Fidelity Series International Value Fund 4.2 64.7 |
| Fidelity Flex Freedom Blend 2065 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2065 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2065 Fund |
| Trading Symbol | FDFPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2065 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2065 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 9,459,386 |
| Holdings Count | shares | 28 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 28 Portfolio Turnover 21 % |
| Holdings [Text Block] | Domestic Equity Funds 51.0 International Equity Funds 41.9 Bond Funds 7.1 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.2 Fidelity Series Blue Chip Growth Fund 11.7 Fidelity Series Emerging Markets Opportunities Fund 11.1 Fidelity Series Large Cap Growth Index Fund 7.6 Fidelity Series International Value Fund 7.0 Fidelity Series Overseas Fund 7.0 Fidelity Series International Growth Fund 7.0 Fidelity Series Large Cap Stock Fund 6.8 Fidelity Series Long-Term Treasury Bond Index Fund 5.5 Fidelity Series Value Discovery Fund 4.9 82.8 |
| Fidelity Freedom Index 2070 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2070 Fund |
| Class Name | Fidelity Freedom® Index 2070 Fund Institutional Premium Class |
| Trading Symbol | FRBUX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2070 Fund for the period June 28, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class A $ 0.08 % A Expenses for the full reporting period would be higher. |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.08% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 2,518,147 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 0% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover B 0 % A A Amount represents less than 1% B Amount not annualized |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2025 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2025 Fund |
| Class Name | Fidelity Freedom® Index 2025 Fund Institutional Premium Class |
| Trading Symbol | FFEDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2025 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 14,699,618,165 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 8 % |
| Holdings [Text Block] | Bond Funds 47.5 Domestic Equity Funds 31.6 International Equity Funds 20.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 31.6 Fidelity Series Bond Index Fund 29.2 Fidelity Series Global ex U.S. Index Fund 20.9 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 9.3 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series Long-Term Treasury Bond Index Fund 4.1 100.0 |
| Fidelity Flex Freedom Blend 2015 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2015 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2015 Fund |
| Trading Symbol | FILSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2015 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2015 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 10,722,112 |
| Holdings Count | shares | 33 |
| Investment Company Portfolio Turnover | 22% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 33 Portfolio Turnover 22 % |
| Holdings [Text Block] | Bond Funds 61.0 International Equity Funds 20.0 Domestic Equity Funds 18.4 Short-Term Funds 0.6 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Government Bond Index Fund 11.4 Fidelity Series Investment Grade Bond Fund 11.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 10.6 Fidelity Series Corporate Bond Fund 7.2 Fidelity Series Investment Grade Securitized Fund 7.0 Fidelity Series Emerging Markets Opportunities Fund 5.9 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 5.3 Fidelity Series Large Cap Value Index Fund 5.1 Fidelity Series Blue Chip Growth Fund 4.2 Fidelity Series International Developed Markets Bond Index Fund 4.0 71.7 |
| Fidelity Flex Freedom Blend 2055 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2055 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2055 Fund |
| Trading Symbol | FQLSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2055 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2055 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 38,431,227 |
| Holdings Count | shares | 28 |
| Investment Company Portfolio Turnover | 24% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 28 Portfolio Turnover 24 % |
| Holdings [Text Block] | Domestic Equity Funds 51.0 International Equity Funds 41.9 Bond Funds 7.1 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.2 Fidelity Series Blue Chip Growth Fund 11.7 Fidelity Series Emerging Markets Opportunities Fund 11.1 Fidelity Series Large Cap Growth Index Fund 7.6 Fidelity Series International Value Fund 7.0 Fidelity Series Overseas Fund 7.0 Fidelity Series International Growth Fund 7.0 Fidelity Series Large Cap Stock Fund 6.8 Fidelity Series Long-Term Treasury Bond Index Fund 5.5 Fidelity Series Value Discovery Fund 4.9 82.8 |
| Fidelity Freedom Index 2030 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2030 Fund |
| Class Name | Fidelity Freedom® Index 2030 Fund Premier Class |
| Trading Symbol | FMKPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2030 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 22,274,558,937 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 10% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 10 % |
| Holdings [Text Block] | Bond Funds 41.0 Domestic Equity Funds 35.5 International Equity Funds 23.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 35.5 Fidelity Series Bond Index Fund 26.5 Fidelity Series Global ex U.S. Index Fund 23.5 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 5.2 Fidelity Series International Developed Markets Bond Index Fund 4.8 Fidelity Series Long-Term Treasury Bond Index Fund 4.5 100.0 |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2010 Fund |
| Class Name | Fidelity Freedom® Index 2010 Fund Institutional Premium Class |
| Trading Symbol | FFWTX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2010 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 733,849,570 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 14 % |
| Holdings [Text Block] | Bond Funds 65.8 Domestic Equity Funds 15.7 International Equity Funds 10.4 Short-Term Funds 8.1 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 40.2 Fidelity Series Total Market Index Fund 15.7 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 15.4 Fidelity Series Global ex U.S. Index Fund 10.4 Fidelity Series Treasury Bill Index Fund 8.1 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series Long-Term Treasury Bond Index Fund 3.2 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 2.1 100.0 |
| Fidelity Freedom Index 2020 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2020 Fund |
| Class Name | Fidelity Freedom® Index 2020 Fund Premier Class |
| Trading Symbol | FKIPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2020 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 7,157,854,253 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 8 % |
| Holdings [Text Block] | Bond Funds 53.3 Domestic Equity Funds 26.7 International Equity Funds 17.7 Short-Term Funds 2.3 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 33.1 Fidelity Series Total Market Index Fund 26.7 Fidelity Series Global ex U.S. Index Fund 17.7 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 7.3 Fidelity Series International Developed Markets Bond Index Fund 5.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 4.2 Fidelity Series Long-Term Treasury Bond Index Fund 3.7 Fidelity Series Treasury Bill Index Fund 2.3 100.0 |
| Fidelity Freedom Index 2070 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2070 Fund |
| Class Name | Fidelity Freedom® Index 2070 Fund Premier Class |
| Trading Symbol | FRBWX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2070 Fund for the period June 28, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class A $ 0.05 % A Expenses for the full reporting period would be higher. |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.05% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 2,518,147 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 0% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover B 0 % A A Amount represents less than 1% B Amount not annualized |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2060 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2060 Fund |
| Class Name | Fidelity Freedom® Index 2060 Fund Institutional Premium Class |
| Trading Symbol | FFLEX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2060 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 8,047,655,750 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 5% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 5 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Flex Freedom Blend 2050 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2050 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2050 Fund |
| Trading Symbol | FYLSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2050 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2050 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 55,138,849 |
| Holdings Count | shares | 28 |
| Investment Company Portfolio Turnover | 27% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 28 Portfolio Turnover 27 % |
| Holdings [Text Block] | Domestic Equity Funds 51.0 International Equity Funds 41.9 Bond Funds 7.1 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.2 Fidelity Series Blue Chip Growth Fund 11.7 Fidelity Series Emerging Markets Opportunities Fund 11.1 Fidelity Series Large Cap Growth Index Fund 7.6 Fidelity Series International Value Fund 7.0 Fidelity Series Overseas Fund 7.0 Fidelity Series International Growth Fund 7.0 Fidelity Series Large Cap Stock Fund 6.8 Fidelity Series Long-Term Treasury Bond Index Fund 5.5 Fidelity Series Value Discovery Fund 4.9 82.8 |
| Fidelity Freedom Index 2035 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2035 Fund |
| Class Name | Fidelity Freedom® Index 2035 Fund Premier Class |
| Trading Symbol | FNIPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2035 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 22,859,083,179 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 11 % |
| Holdings [Text Block] | Domestic Equity Funds 41.7 Bond Funds 30.8 International Equity Funds 27.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 41.7 Fidelity Series Global ex U.S. Index Fund 27.5 Fidelity Series Bond Index Fund 20.7 Fidelity Series Long-Term Treasury Bond Index Fund 4.9 Fidelity Series International Developed Markets Bond Index Fund 4.2 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 1.0 100.0 |
| Fidelity Freedom Index 2040 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2040 Fund |
| Class Name | Fidelity Freedom® Index 2040 Fund Premier Class |
| Trading Symbol | FPIPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2040 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 23,405,059,072 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 9% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 9 % |
| Holdings [Text Block] | Domestic Equity Funds 50.2 International Equity Funds 33.3 Bond Funds 16.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 50.2 Fidelity Series Global ex U.S. Index Fund 33.3 Fidelity Series Bond Index Fund 9.4 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series International Developed Markets Bond Index Fund 2.1 100.0 |
| Fidelity Flex Freedom Blend 2030 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2030 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2030 Fund |
| Trading Symbol | FVLSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2030 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2030 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 79,209,508 |
| Holdings Count | shares | 30 |
| Investment Company Portfolio Turnover | 28% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 30 Portfolio Turnover 28 % |
| Holdings [Text Block] | Bond Funds 37.7 Domestic Equity Funds 32.8 International Equity Funds 29.5 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 9.1 Fidelity Series Emerging Markets Opportunities Fund 8.1 Fidelity Series Blue Chip Growth Fund 7.5 Fidelity Series Long-Term Treasury Bond Index Fund 6.9 Fidelity Series Government Bond Index Fund 5.9 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 5.8 Fidelity Series Investment Grade Bond Fund 5.7 Fidelity Series Large Cap Growth Index Fund 4.9 Fidelity Series International Value Fund 4.7 Fidelity Series Overseas Fund 4.7 63.3 |
| Fidelity Freedom Index 2025 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2025 Fund |
| Class Name | Fidelity Freedom® Index 2025 Fund Premier Class |
| Trading Symbol | FLIPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2025 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 14,699,618,165 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 8 % |
| Holdings [Text Block] | Bond Funds 47.5 Domestic Equity Funds 31.6 International Equity Funds 20.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 31.6 Fidelity Series Bond Index Fund 29.2 Fidelity Series Global ex U.S. Index Fund 20.9 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 9.3 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series Long-Term Treasury Bond Index Fund 4.1 100.0 |
| Fidelity Freedom Index 2050 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2050 Fund |
| Class Name | Fidelity Freedom® Index 2050 Fund Institutional Premium Class |
| Trading Symbol | FFOPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2050 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 19,727,473,878 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 7% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 7 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2015 Fund |
| Class Name | Fidelity Freedom® Index 2015 Fund Institutional Premium Class |
| Trading Symbol | FIWFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2015 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Institutional Premium Class $ 0.08 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.08% |
| Net Assets | $ 2,055,460,161 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 59.6 Domestic Equity Funds 21.2 International Equity Funds 14.0 Short-Term Funds 5.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 36.7 Fidelity Series Total Market Index Fund 21.2 Fidelity Series Global ex U.S. Index Fund 14.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 9.8 Fidelity Series Treasury Bill Index Fund 5.2 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 4.7 Fidelity Series Long-Term Treasury Bond Index Fund 3.5 100.0 |
| Fidelity Freedom Index 2050 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2050 Fund |
| Class Name | Fidelity Freedom® Index 2050 Fund Premier Class |
| Trading Symbol | FRLPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2050 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 19,727,473,878 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 7% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 7 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2050 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2050 Fund |
| Class Name | Fidelity Freedom® Index 2050 Fund Investor Class |
| Trading Symbol | FIPFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2050 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 19,727,473,878 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 7% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 7 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2055 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2055 Fund |
| Class Name | Fidelity Freedom® Index 2055 Fund Investor Class |
| Trading Symbol | FDEWX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2055 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 14,448,762,506 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 6% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 6 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2025 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2025 Fund |
| Class Name | Fidelity Freedom® Index 2025 Fund Investor Class |
| Trading Symbol | FQIFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2025 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 14,699,618,165 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 8 % |
| Holdings [Text Block] | Bond Funds 47.5 Domestic Equity Funds 31.6 International Equity Funds 20.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 31.6 Fidelity Series Bond Index Fund 29.2 Fidelity Series Global ex U.S. Index Fund 20.9 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 9.3 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series Long-Term Treasury Bond Index Fund 4.1 100.0 |
| Fidelity Freedom Index Income Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index Income Fund |
| Class Name | Fidelity Freedom® Index Income Fund Premier Class |
| Trading Symbol | FAPIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index Income Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 1,681,067,537 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 14 % |
| Holdings [Text Block] | Bond Funds 70.9 Domestic Equity Funds 11.5 Short-Term Funds 10.0 International Equity Funds 7.6 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 43.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 19.9 Fidelity Series Total Market Index Fund 11.5 Fidelity Series Treasury Bill Index Fund 10.0 Fidelity Series Global ex U.S. Index Fund 7.6 Fidelity Series International Developed Markets Bond Index Fund 5.0 Fidelity Series Long-Term Treasury Bond Index Fund 3.0 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 0.0 100.0 |
| Fidelity Freedom Index 2065 Fund - Investor Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2065 Fund |
| Class Name | Fidelity Freedom® Index 2065 Fund Investor Class |
| Trading Symbol | FFIJX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2065 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-8544 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Investor Class $ 0.12 % |
| Expenses Paid, Amount | $ 6 |
| Expense Ratio, Percent | 0.12% |
| Net Assets | $ 2,413,130,862 |
| Holdings Count | shares | 6 |
| Investment Company Portfolio Turnover | 4% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 6 Portfolio Turnover 4 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Freedom Index 2015 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2015 Fund |
| Class Name | Fidelity Freedom® Index 2015 Fund Premier Class |
| Trading Symbol | FFYPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2015 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 2,055,460,161 |
| Holdings Count | shares | 8 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 8 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 59.6 Domestic Equity Funds 21.2 International Equity Funds 14.0 Short-Term Funds 5.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Bond Index Fund 36.7 Fidelity Series Total Market Index Fund 21.2 Fidelity Series Global ex U.S. Index Fund 14.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 9.8 Fidelity Series Treasury Bill Index Fund 5.2 Fidelity Series International Developed Markets Bond Index Fund 4.9 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 4.7 Fidelity Series Long-Term Treasury Bond Index Fund 3.5 100.0 |
| Fidelity Freedom Index 2055 Fund - Premier Class | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Index 2055 Fund |
| Class Name | Fidelity Freedom® Index 2055 Fund Premier Class |
| Trading Symbol | FTYPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® Index 2055 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Premier Class $ 0.05 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| Net Assets | $ 14,448,762,506 |
| Holdings Count | shares | 5 |
| Investment Company Portfolio Turnover | 6% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 5 Portfolio Turnover 6 % |
| Holdings [Text Block] | Domestic Equity Funds 54.2 International Equity Funds 35.9 Bond Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Total Market Index Fund 54.2 Fidelity Series Global ex U.S. Index Fund 35.9 Fidelity Series Long-Term Treasury Bond Index Fund 5.0 Fidelity Series Bond Index Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 0.9 100.0 |
| Fidelity Flex Freedom Blend 2060 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Flex® Freedom Blend 2060 Fund |
| Class Name | Fidelity Flex® Freedom Blend 2060 Fund |
| Trading Symbol | FWLSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Flex® Freedom Blend 2060 Fund for the period April 1, 2024 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-3455 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-544-3455 |
| Additional Information Email | fidfunddocuments@fidelity.com |
| Additional Information Website | fundresearch.fidelity.com/prospectus/sec |
| Expenses [Text Block] | What were your Fund costs for the last six months? (based on hypothetical $10,000 investment) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity Flex® Freedom Blend 2060 Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 20,349,137 |
| Holdings Count | shares | 28 |
| Investment Company Portfolio Turnover | 28% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 28 Portfolio Turnover 28 % |
| Holdings [Text Block] | Domestic Equity Funds 51.0 International Equity Funds 41.9 Bond Funds 7.1 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Large Cap Value Index Fund 14.2 Fidelity Series Blue Chip Growth Fund 11.7 Fidelity Series Emerging Markets Opportunities Fund 11.1 Fidelity Series Large Cap Growth Index Fund 7.6 Fidelity Series International Value Fund 7.0 Fidelity Series Overseas Fund 7.0 Fidelity Series International Growth Fund 7.0 Fidelity Series Large Cap Stock Fund 6.8 Fidelity Series Long-Term Treasury Bond Index Fund 5.5 Fidelity Series Value Discovery Fund 4.9 82.8 |
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 |
| Fidelity Freedom Index 2050 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2050 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2050 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2050 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2050 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2050 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2050 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2050 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2050 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2055 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2055 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2055 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2055 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2055 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2055 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2055 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2055 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2055 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2065 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2065 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2065 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2065 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2065 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2065 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2065 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2065 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2065 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2045 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2045 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2045 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2045 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2045 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2045 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2045 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2045 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2045 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2040 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.20% |
| Fidelity Freedom Index 2040 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| Fidelity Freedom Index 2040 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Freedom Index 2040 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2040 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Freedom Index 2040 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.20% |
| Fidelity Freedom Index 2040 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| Fidelity Freedom Index 2040 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.50% |
| Fidelity Freedom Index 2040 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2070 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2070 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2070 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2070 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2070 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2070 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2070 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2070 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2070 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.20% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.40% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 65.80% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2010 Fund - Premier II Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Fidelity Freedom Index 2035 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.70% |
| Fidelity Freedom Index 2035 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.50% |
| Fidelity Freedom Index 2035 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| Fidelity Freedom Index 2035 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2035 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Freedom Index 2035 Fund - Premier II Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Freedom Index 2035 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.70% |
| Fidelity Freedom Index 2035 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.50% |
| Fidelity Freedom Index 2035 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 30.80% |
| Fidelity Freedom Index 2035 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index Income Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43% |
| Fidelity Freedom Index Income Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.90% |
| Fidelity Freedom Index Income Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Fidelity Freedom Index Income Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Fidelity Freedom Index Income Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Freedom Index Income Fund - Premier II Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index Income Fund - Premier II Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Freedom Index Income Fund - Premier II Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index Income Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Fidelity Freedom Index Income Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Freedom Index Income Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 70.90% |
| Fidelity Freedom Index Income Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index Income Fund - Premier II Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Fidelity Freedom Index 2060 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2060 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2060 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2060 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2060 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2060 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2060 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2060 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2060 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2030 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.50% |
| Fidelity Freedom Index 2030 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.50% |
| Fidelity Freedom Index 2030 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Fidelity Freedom Index 2030 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom Index 2030 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Freedom Index 2030 Fund - Premier II Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Freedom Index 2030 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.50% |
| Fidelity Freedom Index 2030 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Fidelity Freedom Index 2030 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41% |
| Fidelity Freedom Index 2030 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.70% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 59.60% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2015 Fund - Premier II Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom Index 2025 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Freedom Index 2025 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.20% |
| Fidelity Freedom Index 2025 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.90% |
| Fidelity Freedom Index 2025 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom Index 2025 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2025 Fund - Premier II Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom Index 2025 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Freedom Index 2025 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.90% |
| Fidelity Freedom Index 2025 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.50% |
| Fidelity Freedom Index 2025 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.10% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 53.30% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2020 Fund - Premier II Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Freedom Index 2030 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.50% |
| Fidelity Freedom Index 2030 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.50% |
| Fidelity Freedom Index 2030 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Fidelity Freedom Index 2030 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom Index 2030 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Freedom Index 2030 Fund - Institutional Premium Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Freedom Index 2030 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.50% |
| Fidelity Freedom Index 2030 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Fidelity Freedom Index 2030 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41% |
| Fidelity Freedom Index 2030 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2040 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.30% |
| Fidelity Flex Freedom Blend 2040 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| Fidelity Flex Freedom Blend 2040 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.50% |
| Fidelity Flex Freedom Blend 2040 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Flex Freedom Blend 2040 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Flex Freedom Blend 2040 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Flex Freedom Blend 2040 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Flex Freedom Blend 2040 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Flex Freedom Blend 2040 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Flex Freedom Blend 2040 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Flex Freedom Blend 2040 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.60% |
| Fidelity Flex Freedom Blend 2040 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39.20% |
| Fidelity Flex Freedom Blend 2040 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| Fidelity Flex Freedom Blend 2040 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2015 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.70% |
| Fidelity Freedom Index 2015 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| Fidelity Freedom Index 2015 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| Fidelity Freedom Index 2015 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| Fidelity Freedom Index 2015 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom Index 2015 Fund - Investor Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2015 Fund - Investor Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom Index 2015 Fund - Investor Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Freedom Index 2015 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| Fidelity Freedom Index 2015 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| Fidelity Freedom Index 2015 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 59.60% |
| Fidelity Freedom Index 2015 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2015 Fund - Investor Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Flex Freedom Blend 2045 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Flex Freedom Blend 2045 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| Fidelity Flex Freedom Blend 2045 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Flex Freedom Blend 2045 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Flex Freedom Blend 2045 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2045 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2045 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2045 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Flex Freedom Blend 2045 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Flex Freedom Blend 2045 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Flex Freedom Blend 2045 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51% |
| Fidelity Flex Freedom Blend 2045 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.90% |
| Fidelity Flex Freedom Blend 2045 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Flex Freedom Blend 2045 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2070 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2070 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2070 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2070 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2070 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2070 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2070 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2070 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2070 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.10% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 53.30% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2020 Fund - Institutional Premium Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Freedom Index 2020 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.10% |
| Fidelity Freedom Index 2020 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Freedom Index 2020 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Freedom Index 2020 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom Index 2020 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2020 Fund - Investor Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Freedom Index 2020 Fund - Investor Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Freedom Index 2020 Fund - Investor Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Freedom Index 2020 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Freedom Index 2020 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Freedom Index 2020 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 53.30% |
| Fidelity Freedom Index 2020 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2020 Fund - Investor Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Freedom Index 2055 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2055 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2055 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2055 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2055 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2055 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2055 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2055 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2055 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2060 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2060 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2060 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2060 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2060 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2060 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2060 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2060 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2060 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2065 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2065 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2065 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2065 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2065 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2065 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2065 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2065 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2065 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2010 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| Fidelity Flex Freedom Blend 2010 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.50% |
| Fidelity Flex Freedom Blend 2010 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12% |
| Fidelity Flex Freedom Blend 2010 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Flex Freedom Blend 2010 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| Fidelity Flex Freedom Blend 2010 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Flex Freedom Blend 2010 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Flex Freedom Blend 2010 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Flex Freedom Blend 2010 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Flex Freedom Blend 2010 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Flex Freedom Blend 2010 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| Fidelity Flex Freedom Blend 2010 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.40% |
| Fidelity Flex Freedom Blend 2010 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 67.30% |
| Fidelity Flex Freedom Blend 2010 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2010 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Freedom Index 2035 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.70% |
| Fidelity Freedom Index 2035 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.50% |
| Fidelity Freedom Index 2035 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| Fidelity Freedom Index 2035 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2035 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Freedom Index 2035 Fund - Institutional Premium Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Freedom Index 2035 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.70% |
| Fidelity Freedom Index 2035 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.50% |
| Fidelity Freedom Index 2035 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 30.80% |
| Fidelity Freedom Index 2035 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2070 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Flex Freedom Blend 2070 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| Fidelity Flex Freedom Blend 2070 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Flex Freedom Blend 2070 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Flex Freedom Blend 2070 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2070 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2070 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2070 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Flex Freedom Blend 2070 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Flex Freedom Blend 2070 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Flex Freedom Blend 2070 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51% |
| Fidelity Flex Freedom Blend 2070 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.90% |
| Fidelity Flex Freedom Blend 2070 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Flex Freedom Blend 2070 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2065 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2065 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2065 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2065 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2065 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2065 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2065 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2065 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2065 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2045 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2045 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2045 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2045 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2045 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2045 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2045 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2045 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2045 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2030 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.50% |
| Fidelity Freedom Index 2030 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.50% |
| Fidelity Freedom Index 2030 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Fidelity Freedom Index 2030 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom Index 2030 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Freedom Index 2030 Fund - Investor Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Freedom Index 2030 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.50% |
| Fidelity Freedom Index 2030 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Fidelity Freedom Index 2030 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41% |
| Fidelity Freedom Index 2030 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2040 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.20% |
| Fidelity Freedom Index 2040 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| Fidelity Freedom Index 2040 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Freedom Index 2040 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2040 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Freedom Index 2040 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.20% |
| Fidelity Freedom Index 2040 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| Fidelity Freedom Index 2040 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.50% |
| Fidelity Freedom Index 2040 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2045 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2045 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2045 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2045 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2045 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2045 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2045 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2045 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2045 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2010 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.20% |
| Fidelity Freedom Index 2010 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Freedom Index 2010 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.40% |
| Fidelity Freedom Index 2010 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| Fidelity Freedom Index 2010 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Fidelity Freedom Index 2010 Fund - Investor Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2010 Fund - Investor Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Freedom Index 2010 Fund - Investor Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Freedom Index 2010 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Freedom Index 2010 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| Fidelity Freedom Index 2010 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 65.80% |
| Fidelity Freedom Index 2010 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2010 Fund - Investor Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Fidelity Flex Freedom Blend 2020 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity Flex Freedom Blend 2020 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Flex Freedom Blend 2020 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Flex Freedom Blend 2020 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Flex Freedom Blend 2020 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Fidelity Flex Freedom Blend 2020 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Flex Freedom Blend 2020 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Flex Freedom Blend 2020 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Flex Freedom Blend 2020 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Flex Freedom Blend 2020 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Flex Freedom Blend 2020 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.90% |
| Fidelity Flex Freedom Blend 2020 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.70% |
| Fidelity Flex Freedom Blend 2020 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Flex Freedom Blend 2020 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2020 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom Index 2040 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.20% |
| Fidelity Freedom Index 2040 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| Fidelity Freedom Index 2040 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Freedom Index 2040 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2040 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Freedom Index 2040 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.20% |
| Fidelity Freedom Index 2040 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| Fidelity Freedom Index 2040 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.50% |
| Fidelity Freedom Index 2040 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2060 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2060 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2060 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2060 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2060 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2060 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2060 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2060 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2060 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend Income Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| Fidelity Flex Freedom Blend Income Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.30% |
| Fidelity Flex Freedom Blend Income Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.90% |
| Fidelity Flex Freedom Blend Income Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.50% |
| Fidelity Flex Freedom Blend Income Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.30% |
| Fidelity Flex Freedom Blend Income Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Flex Freedom Blend Income Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Flex Freedom Blend Income Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Flex Freedom Blend Income Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Flex Freedom Blend Income Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Flex Freedom Blend Income Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Flex Freedom Blend Income Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.60% |
| Fidelity Flex Freedom Blend Income Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 72.40% |
| Fidelity Flex Freedom Blend Income Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend Income Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom Index 2035 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.70% |
| Fidelity Freedom Index 2035 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.50% |
| Fidelity Freedom Index 2035 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| Fidelity Freedom Index 2035 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2035 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Freedom Index 2035 Fund - Investor Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Freedom Index 2035 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.70% |
| Fidelity Freedom Index 2035 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.50% |
| Fidelity Freedom Index 2035 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 30.80% |
| Fidelity Freedom Index 2035 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index Income Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43% |
| Fidelity Freedom Index Income Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.90% |
| Fidelity Freedom Index Income Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Fidelity Freedom Index Income Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Fidelity Freedom Index Income Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Freedom Index Income Fund - Investor Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index Income Fund - Investor Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Freedom Index Income Fund - Investor Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index Income Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Fidelity Freedom Index Income Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Freedom Index Income Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 70.90% |
| Fidelity Freedom Index Income Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index Income Fund - Investor Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Fidelity Flex Freedom Blend 2035 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.20% |
| Fidelity Flex Freedom Blend 2035 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Fidelity Flex Freedom Blend 2035 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Flex Freedom Blend 2035 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Fidelity Flex Freedom Blend 2035 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Flex Freedom Blend 2035 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Flex Freedom Blend 2035 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Flex Freedom Blend 2035 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Flex Freedom Blend 2035 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Flex Freedom Blend 2035 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Flex Freedom Blend 2035 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40% |
| Fidelity Flex Freedom Blend 2035 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33% |
| Fidelity Flex Freedom Blend 2035 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Flex Freedom Blend 2035 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Flex Freedom Blend 2035 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.90% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 70.90% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index Income Fund - Institutional Premium Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Fidelity Freedom Index 2010 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.20% |
| Fidelity Freedom Index 2010 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Freedom Index 2010 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.40% |
| Fidelity Freedom Index 2010 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| Fidelity Freedom Index 2010 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Fidelity Freedom Index 2010 Fund - Premier Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2010 Fund - Premier Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Freedom Index 2010 Fund - Premier Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Freedom Index 2010 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Freedom Index 2010 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| Fidelity Freedom Index 2010 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 65.80% |
| Fidelity Freedom Index 2010 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2010 Fund - Premier Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Fidelity Freedom Index 2045 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2045 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2045 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2045 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2045 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2045 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2045 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2045 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2045 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2025 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Fidelity Flex Freedom Blend 2025 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| Fidelity Flex Freedom Blend 2025 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| Fidelity Flex Freedom Blend 2025 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Flex Freedom Blend 2025 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| Fidelity Flex Freedom Blend 2025 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Flex Freedom Blend 2025 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Flex Freedom Blend 2025 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Fidelity Flex Freedom Blend 2025 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Fidelity Flex Freedom Blend 2025 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Flex Freedom Blend 2025 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.80% |
| Fidelity Flex Freedom Blend 2025 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.90% |
| Fidelity Flex Freedom Blend 2025 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 44.30% |
| Fidelity Flex Freedom Blend 2025 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2065 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Flex Freedom Blend 2065 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| Fidelity Flex Freedom Blend 2065 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Flex Freedom Blend 2065 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Flex Freedom Blend 2065 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2065 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2065 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2065 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Flex Freedom Blend 2065 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Flex Freedom Blend 2065 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Flex Freedom Blend 2065 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51% |
| Fidelity Flex Freedom Blend 2065 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.90% |
| Fidelity Flex Freedom Blend 2065 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Flex Freedom Blend 2065 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2070 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2070 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2070 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2070 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2070 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2070 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2070 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2070 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2070 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2025 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Freedom Index 2025 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.20% |
| Fidelity Freedom Index 2025 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.90% |
| Fidelity Freedom Index 2025 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom Index 2025 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2025 Fund - Institutional Premium Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom Index 2025 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Freedom Index 2025 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.90% |
| Fidelity Freedom Index 2025 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.50% |
| Fidelity Freedom Index 2025 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2015 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.40% |
| Fidelity Flex Freedom Blend 2015 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Flex Freedom Blend 2015 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Flex Freedom Blend 2015 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| Fidelity Flex Freedom Blend 2015 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2015 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Fidelity Flex Freedom Blend 2015 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Flex Freedom Blend 2015 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Fidelity Flex Freedom Blend 2015 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Flex Freedom Blend 2015 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Flex Freedom Blend 2015 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.40% |
| Fidelity Flex Freedom Blend 2015 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| Fidelity Flex Freedom Blend 2015 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61% |
| Fidelity Flex Freedom Blend 2015 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2015 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Flex Freedom Blend 2055 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Flex Freedom Blend 2055 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| Fidelity Flex Freedom Blend 2055 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Flex Freedom Blend 2055 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Flex Freedom Blend 2055 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2055 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2055 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2055 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Flex Freedom Blend 2055 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Flex Freedom Blend 2055 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Flex Freedom Blend 2055 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51% |
| Fidelity Flex Freedom Blend 2055 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.90% |
| Fidelity Flex Freedom Blend 2055 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Flex Freedom Blend 2055 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2030 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.50% |
| Fidelity Freedom Index 2030 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.50% |
| Fidelity Freedom Index 2030 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Fidelity Freedom Index 2030 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom Index 2030 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Freedom Index 2030 Fund - Premier Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Freedom Index 2030 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.50% |
| Fidelity Freedom Index 2030 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.50% |
| Fidelity Freedom Index 2030 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41% |
| Fidelity Freedom Index 2030 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.20% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.40% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.70% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 65.80% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2010 Fund - Institutional Premium Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Fidelity Freedom Index 2020 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.10% |
| Fidelity Freedom Index 2020 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Freedom Index 2020 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Freedom Index 2020 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom Index 2020 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2020 Fund - Premier Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Freedom Index 2020 Fund - Premier Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Freedom Index 2020 Fund - Premier Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Freedom Index 2020 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Freedom Index 2020 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.70% |
| Fidelity Freedom Index 2020 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 53.30% |
| Fidelity Freedom Index 2020 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2020 Fund - Premier Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Freedom Index 2070 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2070 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2070 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2070 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2070 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2070 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2070 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2070 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2070 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2060 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2060 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2060 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2060 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2060 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2060 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2060 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2060 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2060 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2050 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Flex Freedom Blend 2050 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| Fidelity Flex Freedom Blend 2050 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Flex Freedom Blend 2050 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Flex Freedom Blend 2050 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2050 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2050 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2050 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Flex Freedom Blend 2050 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Flex Freedom Blend 2050 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Flex Freedom Blend 2050 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51% |
| Fidelity Flex Freedom Blend 2050 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.90% |
| Fidelity Flex Freedom Blend 2050 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Flex Freedom Blend 2050 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2035 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.70% |
| Fidelity Freedom Index 2035 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.50% |
| Fidelity Freedom Index 2035 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| Fidelity Freedom Index 2035 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2035 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| Fidelity Freedom Index 2035 Fund - Premier Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Freedom Index 2035 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.70% |
| Fidelity Freedom Index 2035 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 27.50% |
| Fidelity Freedom Index 2035 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 30.80% |
| Fidelity Freedom Index 2035 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2040 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.20% |
| Fidelity Freedom Index 2040 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| Fidelity Freedom Index 2040 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Freedom Index 2040 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2040 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Freedom Index 2040 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 50.20% |
| Fidelity Freedom Index 2040 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.30% |
| Fidelity Freedom Index 2040 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.50% |
| Fidelity Freedom Index 2040 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2030 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| Fidelity Flex Freedom Blend 2030 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Fidelity Flex Freedom Blend 2030 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.50% |
| Fidelity Flex Freedom Blend 2030 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.90% |
| Fidelity Flex Freedom Blend 2030 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Fidelity Flex Freedom Blend 2030 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Flex Freedom Blend 2030 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Flex Freedom Blend 2030 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Flex Freedom Blend 2030 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Flex Freedom Blend 2030 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Flex Freedom Blend 2030 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 32.80% |
| Fidelity Flex Freedom Blend 2030 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.50% |
| Fidelity Flex Freedom Blend 2030 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.70% |
| Fidelity Flex Freedom Blend 2030 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2025 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Freedom Index 2025 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.20% |
| Fidelity Freedom Index 2025 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.90% |
| Fidelity Freedom Index 2025 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom Index 2025 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2025 Fund - Premier Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom Index 2025 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Freedom Index 2025 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.90% |
| Fidelity Freedom Index 2025 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.50% |
| Fidelity Freedom Index 2025 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2050 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2050 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2050 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2050 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2050 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2050 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2050 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2050 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2050 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.70% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 59.60% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2015 Fund - Institutional Premium Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom Index 2050 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2050 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2050 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2050 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2050 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2050 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2050 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2050 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2050 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2050 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2050 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2050 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2050 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2050 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2050 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2050 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2050 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2050 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2055 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2055 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2055 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2055 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2055 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2055 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2055 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2055 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2055 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2025 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Freedom Index 2025 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.20% |
| Fidelity Freedom Index 2025 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.90% |
| Fidelity Freedom Index 2025 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom Index 2025 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2025 Fund - Investor Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom Index 2025 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Freedom Index 2025 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.90% |
| Fidelity Freedom Index 2025 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 47.50% |
| Fidelity Freedom Index 2025 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index Income Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43% |
| Fidelity Freedom Index Income Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.90% |
| Fidelity Freedom Index Income Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Fidelity Freedom Index Income Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Fidelity Freedom Index Income Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Freedom Index Income Fund - Premier Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index Income Fund - Premier Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Freedom Index Income Fund - Premier Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index Income Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.50% |
| Fidelity Freedom Index Income Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Freedom Index Income Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 70.90% |
| Fidelity Freedom Index Income Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index Income Fund - Premier Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Fidelity Freedom Index 2065 Fund - Investor Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2065 Fund - Investor Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2065 Fund - Investor Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2065 Fund - Investor Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2065 Fund - Investor Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2065 Fund - Investor Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2065 Fund - Investor Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2065 Fund - Investor Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2065 Fund - Investor Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2015 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.70% |
| Fidelity Freedom Index 2015 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| Fidelity Freedom Index 2015 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| Fidelity Freedom Index 2015 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.80% |
| Fidelity Freedom Index 2015 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom Index 2015 Fund - Premier Class | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom Index 2015 Fund - Premier Class | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom Index 2015 Fund - Premier Class | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Freedom Index 2015 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.20% |
| Fidelity Freedom Index 2015 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| Fidelity Freedom Index 2015 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 59.60% |
| Fidelity Freedom Index 2015 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom Index 2015 Fund - Premier Class | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom Index 2055 Fund - Premier Class | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2055 Fund - Premier Class | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2055 Fund - Premier Class | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom Index 2055 Fund - Premier Class | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom Index 2055 Fund - Premier Class | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Freedom Index 2055 Fund - Premier Class | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 54.20% |
| Fidelity Freedom Index 2055 Fund - Premier Class | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.90% |
| Fidelity Freedom Index 2055 Fund - Premier Class | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Freedom Index 2055 Fund - Premier Class | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Flex Freedom Blend 2060 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| Fidelity Flex Freedom Blend 2060 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| Fidelity Flex Freedom Blend 2060 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Flex Freedom Blend 2060 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Flex Freedom Blend 2060 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2060 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2060 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| Fidelity Flex Freedom Blend 2060 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Flex Freedom Blend 2060 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Flex Freedom Blend 2060 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Flex Freedom Blend 2060 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51% |
| Fidelity Flex Freedom Blend 2060 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.90% |
| Fidelity Flex Freedom Blend 2060 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Flex Freedom Blend 2060 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
