| 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 Income Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Income Fund |
| Class Name | Fidelity Freedom® Income Fund Class K |
| Trading Symbol | FNSHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.42 % |
| Expenses Paid, Amount | $ 21 |
| Expense Ratio, Percent | 0.42% |
| Net Assets | $ 2,617,512,485 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 12 % |
| Holdings [Text Block] | Bond Funds 66.9 International Equity Funds 13.0 Short-Term Funds 10.1 Domestic Equity Funds 9.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 38.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.7 Fidelity Series Government Money Market Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 4.1 Fidelity Series International Developed Markets Bond Index Fund 3.9 Fidelity Series Long-Term Treasury Bond Index Fund 2.8 Fidelity Series International Growth Fund 1.9 Fidelity Series International Value Fund 1.9 Fidelity Series Overseas Fund 1.9 Fidelity Series Short-Term Credit Fund 1.9 85.3 |
| Fidelity Freedom 2020 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2020 Fund |
| Class Name | Fidelity Freedom® 2020 Fund |
| Trading Symbol | FFFDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2020 Fund $ 0.56 % |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.56% |
| Net Assets | $ 14,700,076,247 |
| Holdings Count | shares | 44 |
| 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 44 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 49.1 Domestic Equity Funds 25.0 International Equity Funds 23.1 Short-Term Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 28.0 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 7.3 Fidelity Series Emerging Markets Opportunities Fund 6.4 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 5.0 Fidelity Series Growth Company Fund 4.6 Fidelity Series Large Cap Stock Fund 4.4 Fidelity Series International Value Fund 4.1 Fidelity Series Overseas Fund 4.1 Fidelity Series International Growth Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 3.9 71.8 |
| Fidelity Freedom 2030 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2030 Fund |
| Class Name | Fidelity Freedom® 2030 Fund Class K |
| Trading Symbol | FSNQX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.56 % |
| Expenses Paid, Amount | $ 29 |
| Expense Ratio, Percent | 0.56% |
| Net Assets | $ 33,911,958,323 |
| Holdings Count | shares | 43 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 43 Portfolio Turnover 12 % |
| Holdings [Text Block] | Bond Funds 36.8 Domestic Equity Funds 33.9 International Equity Funds 28.9 Short-Term Funds 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 21.4 Fidelity Series Emerging Markets Opportunities Fund 7.8 Fidelity Series Growth Company Fund 6.3 Fidelity Series Large Cap Stock Fund 6.0 Fidelity Series International Value Fund 5.3 Fidelity Series Overseas Fund 5.3 Fidelity Series International Growth Fund 5.3 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 5.2 Fidelity Series Long-Term Treasury Bond Index Fund 4.3 Fidelity Series Stock Selector Large Cap Value Fund 4.1 71.0 |
| Fidelity Freedom Income Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Income Fund |
| Class Name | Fidelity Freedom® Income Fund |
| Trading Symbol | FFFAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® Income Fund $ 0.47 % |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.47% |
| Net Assets | $ 2,617,512,485 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 12 % |
| Holdings [Text Block] | Bond Funds 66.9 International Equity Funds 13.0 Short-Term Funds 10.1 Domestic Equity Funds 9.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 38.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.7 Fidelity Series Government Money Market Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 4.1 Fidelity Series International Developed Markets Bond Index Fund 3.9 Fidelity Series Long-Term Treasury Bond Index Fund 2.8 Fidelity Series International Growth Fund 1.9 Fidelity Series International Value Fund 1.9 Fidelity Series Overseas Fund 1.9 Fidelity Series Short-Term Credit Fund 1.9 85.3 |
| Fidelity Freedom 2045 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2045 Fund |
| Class Name | Fidelity Freedom® 2045 Fund Class K |
| Trading Symbol | FSNZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.64 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.64% |
| Net Assets | $ 21,801,296,023 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 13 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom 2055 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2055 Fund |
| Class Name | Fidelity Freedom® 2055 Fund Class K |
| Trading Symbol | FNSDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.64 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.64% |
| Net Assets | $ 12,107,574,296 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 13 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom 2065 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2065 Fund |
| Class Name | Fidelity Freedom® 2065 Fund |
| Trading Symbol | FFSFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2065 Fund $ 0.75 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.75% |
| Net Assets | $ 1,762,892,118 |
| Holdings Count | shares | 46 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 46 Portfolio Turnover 12 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom 2050 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2050 Fund |
| Class Name | Fidelity Freedom® 2050 Fund Class K |
| Trading Symbol | FNSBX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.64 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.64% |
| Net Assets | $ 19,735,608,547 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 13 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.9 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.7 |
| Fidelity Freedom 2060 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2060 Fund |
| Class Name | Fidelity Freedom® 2060 Fund |
| Trading Symbol | FDKVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2060 Fund $ 0.75 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.75% |
| Net Assets | $ 6,258,798,912 |
| Holdings Count | shares | 45 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 45 Portfolio Turnover 12 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom Income Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® Income Fund |
| Class Name | Fidelity Freedom® Income Fund Class K6 |
| Trading Symbol | FYTKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.24 % |
| Expenses Paid, Amount | $ 12 |
| Expense Ratio, Percent | 0.24% |
| Net Assets | $ 2,617,512,485 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 12 % |
| Holdings [Text Block] | Bond Funds 66.9 International Equity Funds 13.0 Short-Term Funds 10.1 Domestic Equity Funds 9.7 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 38.0 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 20.7 Fidelity Series Government Money Market Fund 8.2 Fidelity Series Emerging Markets Opportunities Fund 4.1 Fidelity Series International Developed Markets Bond Index Fund 3.9 Fidelity Series Long-Term Treasury Bond Index Fund 2.8 Fidelity Series International Growth Fund 1.9 Fidelity Series International Value Fund 1.9 Fidelity Series Overseas Fund 1.9 Fidelity Series Short-Term Credit Fund 1.9 85.3 |
| Fidelity Freedom 2015 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2015 Fund |
| Class Name | Fidelity Freedom® 2015 Fund Class K |
| Trading Symbol | FSNLX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.45 % |
| Expenses Paid, Amount | $ 23 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 4,908,864,164 |
| Holdings Count | shares | 44 |
| 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 44 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 55.5 Domestic Equity Funds 19.5 International Equity Funds 19.4 Short-Term Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 31.6 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 10.6 Fidelity Series Emerging Markets Opportunities Fund 5.5 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 4.7 Fidelity Series Government Money Market Fund 4.5 Fidelity Series International Developed Markets Bond Index Fund 3.9 Fidelity Series Growth Company Fund 3.6 Fidelity Series Large Cap Stock Fund 3.5 Fidelity Series International Value Fund 3.3 Fidelity Series Overseas Fund 3.3 74.5 |
| Fidelity Freedom 2015 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2015 Fund |
| Class Name | Fidelity Freedom® 2015 Fund |
| Trading Symbol | FFVFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2015 Fund $ 0.52 % |
| Expenses Paid, Amount | $ 27 |
| Expense Ratio, Percent | 0.52% |
| Net Assets | $ 4,908,864,164 |
| Holdings Count | shares | 44 |
| 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 44 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 55.5 Domestic Equity Funds 19.5 International Equity Funds 19.4 Short-Term Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 31.6 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 10.6 Fidelity Series Emerging Markets Opportunities Fund 5.5 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 4.7 Fidelity Series Government Money Market Fund 4.5 Fidelity Series International Developed Markets Bond Index Fund 3.9 Fidelity Series Growth Company Fund 3.6 Fidelity Series Large Cap Stock Fund 3.5 Fidelity Series International Value Fund 3.3 Fidelity Series Overseas Fund 3.3 74.5 |
| Fidelity Freedom 2070 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2070 Fund |
| Class Name | Fidelity Freedom® 2070 Fund Class K6 |
| Trading Symbol | FRBHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 A $ 0.45 % A Expenses for the full reporting period would be higher. |
| Expenses Paid, Amount | $ 12 |
| Expense Ratio, Percent | 0.45% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 1,211,644 |
| Holdings Count | shares | 27 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 27 Portfolio Turnover A 31 % 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 Emerging Markets Opportunities Fund 11.1 Fidelity Series Growth Company Fund 9.5 Fidelity Series Large Cap Stock Fund 9.1 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.2 Fidelity Series Opportunistic Insights Fund 5.6 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Long-Term Treasury Bond Index Fund 5.5 76.3 |
| Fidelity Freedom 2060 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2060 Fund |
| Class Name | Fidelity Freedom® 2060 Fund Class K6 |
| Trading Symbol | FVTKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.45 % |
| Expenses Paid, Amount | $ 23 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 6,258,798,912 |
| Holdings Count | shares | 45 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 45 Portfolio Turnover 12 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom 2040 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2040 Fund |
| Class Name | Fidelity Freedom® 2040 Fund |
| Trading Symbol | FFFFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2040 Fund $ 0.73 % |
| Expenses Paid, Amount | $ 38 |
| Expense Ratio, Percent | 0.73% |
| Net Assets | $ 30,158,071,326 |
| Holdings Count | shares | 43 |
| 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 43 Portfolio Turnover 14 % |
| Holdings [Text Block] | Domestic Equity Funds 48.7 International Equity Funds 38.7 Bond Funds 12.3 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 Emerging Markets Opportunities Fund 10.1 Fidelity Series Growth Company Fund 9.0 Fidelity Series Large Cap Stock Fund 8.7 Fidelity Series International Value Fund 7.3 Fidelity Series Overseas Fund 7.3 Fidelity Series International Growth Fund 7.3 Fidelity Series Stock Selector Large Cap Value Fund 5.9 Fidelity Series Opportunistic Insights Fund 5.4 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Blue Chip Growth Fund 4.9 71.3 |
| Fidelity Freedom 2045 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2045 Fund |
| Class Name | Fidelity Freedom® 2045 Fund Class K6 |
| Trading Symbol | FJTKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.45 % |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 21,801,296,023 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 13 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom 2055 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2055 Fund |
| Class Name | Fidelity Freedom® 2055 Fund |
| Trading Symbol | FDEEX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2055 Fund $ 0.75 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.75% |
| Net Assets | $ 12,107,574,296 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 13 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom 2050 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2050 Fund |
| Class Name | Fidelity Freedom® 2050 Fund |
| Trading Symbol | FFFHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2050 Fund $ 0.75 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.75% |
| Net Assets | $ 19,735,608,547 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 13 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.9 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.7 |
| Fidelity Freedom 2025 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2025 Fund |
| Class Name | Fidelity Freedom® 2025 Fund |
| Trading Symbol | FFTWX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2025 Fund $ 0.60 % |
| Expenses Paid, Amount | $ 31 |
| Expense Ratio, Percent | 0.60% |
| Net Assets | $ 22,382,922,087 |
| Holdings Count | shares | 43 |
| 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 43 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 29.9 International Equity Funds 26.3 Short-Term Funds 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 24.2 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 9.4 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Growth Company Fund 5.6 Fidelity Series Large Cap Stock Fund 5.3 Fidelity Series International Value Fund 4.7 Fidelity Series Overseas Fund 4.7 Fidelity Series International Growth Fund 4.7 Fidelity Series Long-Term Treasury Bond Index Fund 3.9 Fidelity Series International Developed Markets Bond Index Fund 3.9 73.5 |
| Fidelity Freedom 2010 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2010 Fund |
| Class Name | Fidelity Freedom® 2010 Fund Class K |
| Trading Symbol | FSNKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.42 % |
| Expenses Paid, Amount | $ 22 |
| Expense Ratio, Percent | 0.42% |
| Net Assets | $ 3,442,412,678 |
| Holdings Count | shares | 45 |
| 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 45 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 61.8 International Equity Funds 15.8 Domestic Equity Funds 14.0 Short-Term Funds 8.2 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 Investment Grade Bond Fund 35.1 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 16.2 Fidelity Series Government Money Market Fund 6.8 Fidelity Series Emerging Markets Opportunities Fund 5.0 Fidelity Series International Developed Markets Bond Index Fund 3.9 Fidelity Series Long-Term Treasury Bond Index Fund 3.0 Fidelity Series Growth Company Fund 2.6 Fidelity Series International Value Fund 2.5 Fidelity Series Overseas Fund 2.5 Fidelity Series International Growth Fund 2.5 80.1 |
| Fidelity Freedom 2070 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2070 Fund |
| Class Name | Fidelity Freedom® 2070 Fund |
| Trading Symbol | FRBDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Freedom® 2070 Fund A $ 0.75 % A Expenses for the full reporting period would be higher. |
| Expenses Paid, Amount | $ 20 |
| Expense Ratio, Percent | 0.75% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 1,211,644 |
| Holdings Count | shares | 27 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 27 Portfolio Turnover A 31 % 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 Emerging Markets Opportunities Fund 11.1 Fidelity Series Growth Company Fund 9.5 Fidelity Series Large Cap Stock Fund 9.1 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.2 Fidelity Series Opportunistic Insights Fund 5.6 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Long-Term Treasury Bond Index Fund 5.5 76.3 |
| Fidelity Freedom 2040 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2040 Fund |
| Class Name | Fidelity Freedom® 2040 Fund Class K6 |
| Trading Symbol | FHTKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.44 % |
| Expenses Paid, Amount | $ 23 |
| Expense Ratio, Percent | 0.44% |
| Net Assets | $ 30,158,071,326 |
| Holdings Count | shares | 43 |
| 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 43 Portfolio Turnover 14 % |
| Holdings [Text Block] | Domestic Equity Funds 48.7 International Equity Funds 38.7 Bond Funds 12.3 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 Emerging Markets Opportunities Fund 10.1 Fidelity Series Growth Company Fund 9.0 Fidelity Series Large Cap Stock Fund 8.7 Fidelity Series International Value Fund 7.3 Fidelity Series Overseas Fund 7.3 Fidelity Series International Growth Fund 7.3 Fidelity Series Stock Selector Large Cap Value Fund 5.9 Fidelity Series Opportunistic Insights Fund 5.4 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Blue Chip Growth Fund 4.9 71.3 |
| Fidelity Freedom 2035 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2035 Fund |
| Class Name | Fidelity Freedom® 2035 Fund Class K6 |
| Trading Symbol | FWTKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.40 % |
| Expenses Paid, Amount | $ 21 |
| Expense Ratio, Percent | 0.40% |
| Net Assets | $ 29,378,565,674 |
| Holdings Count | shares | 44 |
| 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 44 Portfolio Turnover 14 % |
| 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 Investment Grade Bond Fund 15.6 Fidelity Series Emerging Markets Opportunities Fund 8.7 Fidelity Series Growth Company Fund 7.4 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series International Value Fund 6.1 Fidelity Series Overseas Fund 6.1 Fidelity Series International Growth Fund 6.1 Fidelity Series Stock Selector Large Cap Value Fund 4.9 Fidelity Series Long-Term Treasury Bond Index Fund 4.7 Fidelity Series Opportunistic Insights Fund 4.4 71.1 |
| Fidelity Freedom 2025 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2025 Fund |
| Class Name | Fidelity Freedom® 2025 Fund Class K6 |
| Trading Symbol | FDTKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.33 % |
| Expenses Paid, Amount | $ 17 |
| Expense Ratio, Percent | 0.33% |
| Net Assets | $ 22,382,922,087 |
| Holdings Count | shares | 43 |
| 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 43 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 29.9 International Equity Funds 26.3 Short-Term Funds 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 24.2 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 9.4 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Growth Company Fund 5.6 Fidelity Series Large Cap Stock Fund 5.3 Fidelity Series International Value Fund 4.7 Fidelity Series Overseas Fund 4.7 Fidelity Series International Growth Fund 4.7 Fidelity Series Long-Term Treasury Bond Index Fund 3.9 Fidelity Series International Developed Markets Bond Index Fund 3.9 73.5 |
| Fidelity Freedom 2050 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2050 Fund |
| Class Name | Fidelity Freedom® 2050 Fund Class K6 |
| Trading Symbol | FZTKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.45 % |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 19,735,608,547 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 13 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.9 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.7 |
| Fidelity Freedom 2025 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2025 Fund |
| Class Name | Fidelity Freedom® 2025 Fund Class K |
| Trading Symbol | FSNPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.52 % |
| Expenses Paid, Amount | $ 27 |
| Expense Ratio, Percent | 0.52% |
| Net Assets | $ 22,382,922,087 |
| Holdings Count | shares | 43 |
| 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 43 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 43.4 Domestic Equity Funds 29.9 International Equity Funds 26.3 Short-Term Funds 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 24.2 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 9.4 Fidelity Series Emerging Markets Opportunities Fund 7.1 Fidelity Series Growth Company Fund 5.6 Fidelity Series Large Cap Stock Fund 5.3 Fidelity Series International Value Fund 4.7 Fidelity Series Overseas Fund 4.7 Fidelity Series International Growth Fund 4.7 Fidelity Series Long-Term Treasury Bond Index Fund 3.9 Fidelity Series International Developed Markets Bond Index Fund 3.9 73.5 |
| Fidelity Freedom 2010 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2010 Fund |
| Class Name | Fidelity Freedom® 2010 Fund |
| Trading Symbol | FFFCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2010 Fund $ 0.47 % |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.47% |
| Net Assets | $ 3,442,412,678 |
| Holdings Count | shares | 45 |
| 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 45 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 61.8 International Equity Funds 15.8 Domestic Equity Funds 14.0 Short-Term Funds 8.2 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 Investment Grade Bond Fund 35.1 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 16.2 Fidelity Series Government Money Market Fund 6.8 Fidelity Series Emerging Markets Opportunities Fund 5.0 Fidelity Series International Developed Markets Bond Index Fund 3.9 Fidelity Series Long-Term Treasury Bond Index Fund 3.0 Fidelity Series Growth Company Fund 2.6 Fidelity Series International Value Fund 2.5 Fidelity Series Overseas Fund 2.5 Fidelity Series International Growth Fund 2.5 80.1 |
| Fidelity Freedom 2065 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2065 Fund |
| Class Name | Fidelity Freedom® 2065 Fund Class K |
| Trading Symbol | FFSDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.64 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.64% |
| Net Assets | $ 1,762,892,118 |
| Holdings Count | shares | 46 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 46 Portfolio Turnover 12 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom 2070 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2070 Fund |
| Class Name | Fidelity Freedom® 2070 Fund Class K |
| Trading Symbol | FRBEX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K A $ 0.64 % A Expenses for the full reporting period would be higher. |
| Expenses Paid, Amount | $ 17 |
| Expense Ratio, Percent | 0.64% |
| Expenses Short Period Footnote [Text Block] | Expenses for the full reporting period would be higher. |
| Net Assets | $ 1,211,644 |
| Holdings Count | shares | 27 |
| Investment Company Portfolio Turnover | 31% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 27 Portfolio Turnover A 31 % 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 Emerging Markets Opportunities Fund 11.1 Fidelity Series Growth Company Fund 9.5 Fidelity Series Large Cap Stock Fund 9.1 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.2 Fidelity Series Opportunistic Insights Fund 5.6 Fidelity Series Value Discovery Fund 5.6 Fidelity Series Long-Term Treasury Bond Index Fund 5.5 76.3 |
| Fidelity Freedom 2020 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2020 Fund |
| Class Name | Fidelity Freedom® 2020 Fund Class K |
| Trading Symbol | FSNOX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.49 % |
| Expenses Paid, Amount | $ 25 |
| Expense Ratio, Percent | 0.49% |
| Net Assets | $ 14,700,076,247 |
| Holdings Count | shares | 44 |
| 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 44 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 49.1 Domestic Equity Funds 25.0 International Equity Funds 23.1 Short-Term Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 28.0 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 7.3 Fidelity Series Emerging Markets Opportunities Fund 6.4 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 5.0 Fidelity Series Growth Company Fund 4.6 Fidelity Series Large Cap Stock Fund 4.4 Fidelity Series International Value Fund 4.1 Fidelity Series Overseas Fund 4.1 Fidelity Series International Growth Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 3.9 71.8 |
| Fidelity Freedom 2035 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2035 Fund |
| Class Name | Fidelity Freedom® 2035 Fund Class K |
| Trading Symbol | FSNUX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.59 % |
| Expenses Paid, Amount | $ 31 |
| Expense Ratio, Percent | 0.59% |
| Net Assets | $ 29,378,565,674 |
| Holdings Count | shares | 44 |
| 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 44 Portfolio Turnover 14 % |
| 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 Investment Grade Bond Fund 15.6 Fidelity Series Emerging Markets Opportunities Fund 8.7 Fidelity Series Growth Company Fund 7.4 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series International Value Fund 6.1 Fidelity Series Overseas Fund 6.1 Fidelity Series International Growth Fund 6.1 Fidelity Series Stock Selector Large Cap Value Fund 4.9 Fidelity Series Long-Term Treasury Bond Index Fund 4.7 Fidelity Series Opportunistic Insights Fund 4.4 71.1 |
| Fidelity Freedom 2055 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2055 Fund |
| Class Name | Fidelity Freedom® 2055 Fund Class K6 |
| Trading Symbol | FCTKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.45 % |
| Expenses Paid, Amount | $ 23 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 12,107,574,296 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 13 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom 2030 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2030 Fund |
| Class Name | Fidelity Freedom® 2030 Fund Class K6 |
| Trading Symbol | FGTKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.36 % |
| Expenses Paid, Amount | $ 19 |
| Expense Ratio, Percent | 0.36% |
| Net Assets | $ 33,911,958,323 |
| Holdings Count | shares | 43 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 43 Portfolio Turnover 12 % |
| Holdings [Text Block] | Bond Funds 36.8 Domestic Equity Funds 33.9 International Equity Funds 28.9 Short-Term Funds 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 21.4 Fidelity Series Emerging Markets Opportunities Fund 7.8 Fidelity Series Growth Company Fund 6.3 Fidelity Series Large Cap Stock Fund 6.0 Fidelity Series International Value Fund 5.3 Fidelity Series Overseas Fund 5.3 Fidelity Series International Growth Fund 5.3 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 5.2 Fidelity Series Long-Term Treasury Bond Index Fund 4.3 Fidelity Series Stock Selector Large Cap Value Fund 4.1 71.0 |
| Fidelity Freedom 2030 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2030 Fund |
| Class Name | Fidelity Freedom® 2030 Fund |
| Trading Symbol | FFFEX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2030 Fund $ 0.64 % |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.64% |
| Net Assets | $ 33,911,958,323 |
| Holdings Count | shares | 43 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 43 Portfolio Turnover 12 % |
| Holdings [Text Block] | Bond Funds 36.8 Domestic Equity Funds 33.9 International Equity Funds 28.9 Short-Term Funds 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 21.4 Fidelity Series Emerging Markets Opportunities Fund 7.8 Fidelity Series Growth Company Fund 6.3 Fidelity Series Large Cap Stock Fund 6.0 Fidelity Series International Value Fund 5.3 Fidelity Series Overseas Fund 5.3 Fidelity Series International Growth Fund 5.3 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 5.2 Fidelity Series Long-Term Treasury Bond Index Fund 4.3 Fidelity Series Stock Selector Large Cap Value Fund 4.1 71.0 |
| Fidelity Freedom 2010 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2010 Fund |
| Class Name | Fidelity Freedom® 2010 Fund Class K6 |
| Trading Symbol | FOTKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.25 % |
| Expenses Paid, Amount | $ 13 |
| Expense Ratio, Percent | 0.25% |
| Net Assets | $ 3,442,412,678 |
| Holdings Count | shares | 45 |
| 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 45 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 61.8 International Equity Funds 15.8 Domestic Equity Funds 14.0 Short-Term Funds 8.2 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 Investment Grade Bond Fund 35.1 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 16.2 Fidelity Series Government Money Market Fund 6.8 Fidelity Series Emerging Markets Opportunities Fund 5.0 Fidelity Series International Developed Markets Bond Index Fund 3.9 Fidelity Series Long-Term Treasury Bond Index Fund 3.0 Fidelity Series Growth Company Fund 2.6 Fidelity Series International Value Fund 2.5 Fidelity Series Overseas Fund 2.5 Fidelity Series International Growth Fund 2.5 80.1 |
| Fidelity Freedom 2035 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2035 Fund |
| Class Name | Fidelity Freedom® 2035 Fund |
| Trading Symbol | FFTHX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2035 Fund $ 0.69 % |
| Expenses Paid, Amount | $ 36 |
| Expense Ratio, Percent | 0.69% |
| Net Assets | $ 29,378,565,674 |
| Holdings Count | shares | 44 |
| 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 44 Portfolio Turnover 14 % |
| 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 Investment Grade Bond Fund 15.6 Fidelity Series Emerging Markets Opportunities Fund 8.7 Fidelity Series Growth Company Fund 7.4 Fidelity Series Large Cap Stock Fund 7.1 Fidelity Series International Value Fund 6.1 Fidelity Series Overseas Fund 6.1 Fidelity Series International Growth Fund 6.1 Fidelity Series Stock Selector Large Cap Value Fund 4.9 Fidelity Series Long-Term Treasury Bond Index Fund 4.7 Fidelity Series Opportunistic Insights Fund 4.4 71.1 |
| Fidelity Freedom 2045 Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2045 Fund |
| Class Name | Fidelity Freedom® 2045 Fund |
| Trading Symbol | FFFGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 Fidelity Freedom® 2045 Fund $ 0.75 % |
| Expenses Paid, Amount | $ 39 |
| Expense Ratio, Percent | 0.75% |
| Net Assets | $ 21,801,296,023 |
| Holdings Count | shares | 44 |
| Investment Company Portfolio Turnover | 13% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 44 Portfolio Turnover 13 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom 2015 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2015 Fund |
| Class Name | Fidelity Freedom® 2015 Fund Class K6 |
| Trading Symbol | FPTKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.26 % |
| Expenses Paid, Amount | $ 13 |
| Expense Ratio, Percent | 0.26% |
| Net Assets | $ 4,908,864,164 |
| Holdings Count | shares | 44 |
| 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 44 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 55.5 Domestic Equity Funds 19.5 International Equity Funds 19.4 Short-Term Funds 5.3 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 31.6 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 10.6 Fidelity Series Emerging Markets Opportunities Fund 5.5 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 4.7 Fidelity Series Government Money Market Fund 4.5 Fidelity Series International Developed Markets Bond Index Fund 3.9 Fidelity Series Growth Company Fund 3.6 Fidelity Series Large Cap Stock Fund 3.5 Fidelity Series International Value Fund 3.3 Fidelity Series Overseas Fund 3.3 74.5 |
| Fidelity Freedom 2020 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2020 Fund |
| Class Name | Fidelity Freedom® 2020 Fund Class K6 |
| Trading Symbol | FATKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.29 % |
| Expenses Paid, Amount | $ 15 |
| Expense Ratio, Percent | 0.29% |
| Net Assets | $ 14,700,076,247 |
| Holdings Count | shares | 44 |
| 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 44 Portfolio Turnover 11 % |
| Holdings [Text Block] | Bond Funds 49.1 Domestic Equity Funds 25.0 International Equity Funds 23.1 Short-Term Funds 2.5 Short-Term Investments and Net Other Assets (Liabilities) 0.3 ASSET ALLOCATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Fidelity Series Investment Grade Bond Fund 28.0 Fidelity Series 5+ Year Inflation-Protected Bond Index Fund 7.3 Fidelity Series Emerging Markets Opportunities Fund 6.4 Fidelity Series 0-5 Year Inflation-Protected Bond Index Fund 5.0 Fidelity Series Growth Company Fund 4.6 Fidelity Series Large Cap Stock Fund 4.4 Fidelity Series International Value Fund 4.1 Fidelity Series Overseas Fund 4.1 Fidelity Series International Growth Fund 4.0 Fidelity Series International Developed Markets Bond Index Fund 3.9 71.8 |
| Fidelity Freedom 2060 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2060 Fund |
| Class Name | Fidelity Freedom® 2060 Fund Class K |
| Trading Symbol | FNSFX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.64 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.64% |
| Net Assets | $ 6,258,798,912 |
| Holdings Count | shares | 45 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 45 Portfolio Turnover 12 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom 2065 Fund - Class K6 | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2065 Fund |
| Class Name | Fidelity Freedom® 2065 Fund Class K6 |
| Trading Symbol | FFSZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K6 $ 0.45 % |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.45% |
| Net Assets | $ 1,762,892,118 |
| Holdings Count | shares | 46 |
| Investment Company Portfolio Turnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 46 Portfolio Turnover 12 % |
| Holdings [Text Block] | Domestic Equity Funds 52.2 International Equity Funds 41.3 Bond Funds 6.2 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 Emerging Markets Opportunities Fund 10.6 Fidelity Series Growth Company Fund 9.7 Fidelity Series Large Cap Stock Fund 9.3 Fidelity Series International Value Fund 7.9 Fidelity Series Overseas Fund 7.9 Fidelity Series International Growth Fund 7.9 Fidelity Series Stock Selector Large Cap Value Fund 6.3 Fidelity Series Opportunistic Insights Fund 5.8 Fidelity Series Value Discovery Fund 5.7 Fidelity Series Blue Chip Growth Fund 5.3 76.4 |
| Fidelity Freedom 2040 Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity Freedom® 2040 Fund |
| Class Name | Fidelity Freedom® 2040 Fund Class K |
| Trading Symbol | FSNVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity Freedom® 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 1-800-835-5092 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-800-835-5092 |
| 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 Class K $ 0.63 % |
| Expenses Paid, Amount | $ 33 |
| Expense Ratio, Percent | 0.63% |
| Net Assets | $ 30,158,071,326 |
| Holdings Count | shares | 43 |
| 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 43 Portfolio Turnover 14 % |
| Holdings [Text Block] | Domestic Equity Funds 48.7 International Equity Funds 38.7 Bond Funds 12.3 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 Emerging Markets Opportunities Fund 10.1 Fidelity Series Growth Company Fund 9.0 Fidelity Series Large Cap Stock Fund 8.7 Fidelity Series International Value Fund 7.3 Fidelity Series Overseas Fund 7.3 Fidelity Series International Growth Fund 7.3 Fidelity Series Stock Selector Large Cap Value Fund 5.9 Fidelity Series Opportunistic Insights Fund 5.4 Fidelity Series Value Discovery Fund 5.4 Fidelity Series Blue Chip Growth Fund 4.9 71.3 |
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 |
| Fidelity Freedom Income Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38% |
| Fidelity Freedom Income Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| Fidelity Freedom Income Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| Fidelity Freedom Income Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom Income Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom Income Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Freedom Income Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 66.90% |
| Fidelity Freedom Income Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| Fidelity Freedom Income Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.10% |
| Fidelity Freedom Income Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom Income Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2020 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28% |
| Fidelity Freedom 2020 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2020 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Freedom 2020 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom 2020 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Freedom 2020 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Freedom 2020 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom 2020 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom 2020 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom 2020 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2020 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.10% |
| Fidelity Freedom 2020 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.10% |
| Fidelity Freedom 2020 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2020 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25% |
| Fidelity Freedom 2020 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2030 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.40% |
| Fidelity Freedom 2030 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Freedom 2030 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2030 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Freedom 2030 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2030 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2030 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2030 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom 2030 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Fidelity Freedom 2030 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom 2030 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.80% |
| Fidelity Freedom 2030 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.90% |
| Fidelity Freedom 2030 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2030 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.90% |
| Fidelity Freedom 2030 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom Income Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38% |
| Fidelity Freedom Income Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| Fidelity Freedom Income Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| Fidelity Freedom Income Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom Income Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom Income Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Freedom Income Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 66.90% |
| Fidelity Freedom Income Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| Fidelity Freedom Income Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.10% |
| Fidelity Freedom Income Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom Income Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2045 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2045 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2045 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2045 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2045 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2045 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2045 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2045 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2045 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2045 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2045 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2045 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2045 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2045 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2045 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2055 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2055 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2055 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2055 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2055 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2055 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2055 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2055 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2055 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2055 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2055 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2055 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2055 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2055 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2055 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2065 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2065 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2065 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2065 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2065 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2065 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2065 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2065 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2065 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2065 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2065 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2065 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2065 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2065 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2065 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2050 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| Fidelity Freedom 2050 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2050 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2050 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2050 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2050 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2050 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2050 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2050 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2050 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2050 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2050 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2050 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2050 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2050 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2060 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2060 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2060 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2060 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2060 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2060 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2060 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2060 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2060 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2060 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2060 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2060 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2060 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2060 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2060 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom Income Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38% |
| Fidelity Freedom Income Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.70% |
| Fidelity Freedom Income Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| Fidelity Freedom Income Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom Income Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom Income Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Freedom Income Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Freedom Income Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 66.90% |
| Fidelity Freedom Income Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| Fidelity Freedom Income Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.10% |
| Fidelity Freedom Income Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom Income Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2015 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Freedom 2015 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2015 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Freedom 2015 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2015 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Freedom 2015 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2015 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Freedom 2015 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Freedom 2015 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Freedom 2015 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Freedom 2015 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.50% |
| Fidelity Freedom 2015 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.40% |
| Fidelity Freedom 2015 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2015 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.50% |
| Fidelity Freedom 2015 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2015 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Freedom 2015 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2015 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Freedom 2015 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2015 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Freedom 2015 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2015 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Freedom 2015 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Freedom 2015 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Freedom 2015 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Freedom 2015 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.50% |
| Fidelity Freedom 2015 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.40% |
| Fidelity Freedom 2015 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2015 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.50% |
| Fidelity Freedom 2015 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2070 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Freedom 2070 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.50% |
| Fidelity Freedom 2070 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| Fidelity Freedom 2070 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2070 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2070 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2070 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2070 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Freedom 2070 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Freedom 2070 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Freedom 2070 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Freedom 2070 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.90% |
| Fidelity Freedom 2070 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51% |
| Fidelity Freedom 2070 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom 2060 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2060 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2060 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2060 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2060 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2060 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2060 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2060 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2060 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2060 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2060 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2060 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2060 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2060 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2060 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2040 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.10% |
| Fidelity Freedom 2040 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity Freedom 2040 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Freedom 2040 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2040 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2040 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2040 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Fidelity Freedom 2040 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Freedom 2040 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Freedom 2040 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom 2040 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| Fidelity Freedom 2040 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38.70% |
| Fidelity Freedom 2040 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2040 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 48.70% |
| Fidelity Freedom 2040 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2045 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2045 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2045 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2045 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2045 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2045 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2045 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2045 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2045 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2045 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2045 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2045 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2045 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2045 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2045 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2055 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2055 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2055 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2055 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2055 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2055 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2055 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2055 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2055 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2055 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2055 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2055 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2055 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2055 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2055 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2050 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| Fidelity Freedom 2050 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2050 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2050 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2050 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2050 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2050 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2050 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2050 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2050 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2050 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2050 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2050 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2050 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2050 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2025 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.20% |
| Fidelity Freedom 2025 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Freedom 2025 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Freedom 2025 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Freedom 2025 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2025 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2025 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2025 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2025 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2025 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2025 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.40% |
| Fidelity Freedom 2025 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.30% |
| Fidelity Freedom 2025 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2025 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.90% |
| Fidelity Freedom 2025 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2010 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.10% |
| Fidelity Freedom 2010 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| Fidelity Freedom 2010 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Freedom 2010 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom 2010 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2010 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Freedom 2010 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Freedom 2010 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2010 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2010 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2010 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.80% |
| Fidelity Freedom 2010 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| Fidelity Freedom 2010 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| Fidelity Freedom 2010 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| Fidelity Freedom 2010 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2070 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Freedom 2070 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.50% |
| Fidelity Freedom 2070 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| Fidelity Freedom 2070 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2070 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2070 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2070 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2070 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Freedom 2070 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Freedom 2070 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Freedom 2070 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Freedom 2070 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.90% |
| Fidelity Freedom 2070 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51% |
| Fidelity Freedom 2070 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom 2040 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.10% |
| Fidelity Freedom 2040 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity Freedom 2040 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Freedom 2040 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2040 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2040 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2040 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Fidelity Freedom 2040 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Freedom 2040 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Freedom 2040 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom 2040 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| Fidelity Freedom 2040 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38.70% |
| Fidelity Freedom 2040 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2040 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 48.70% |
| Fidelity Freedom 2040 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2035 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.60% |
| Fidelity Freedom 2035 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Freedom 2035 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Freedom 2035 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Freedom 2035 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Fidelity Freedom 2035 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Fidelity Freedom 2035 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Fidelity Freedom 2035 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom 2035 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2035 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Freedom 2035 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Freedom 2035 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33% |
| Fidelity Freedom 2035 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2035 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40% |
| Fidelity Freedom 2035 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2025 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.20% |
| Fidelity Freedom 2025 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Freedom 2025 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Freedom 2025 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Freedom 2025 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2025 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2025 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2025 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2025 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2025 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2025 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.40% |
| Fidelity Freedom 2025 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.30% |
| Fidelity Freedom 2025 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2025 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.90% |
| Fidelity Freedom 2025 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2050 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| Fidelity Freedom 2050 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2050 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2050 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2050 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2050 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2050 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2050 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2050 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2050 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2050 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2050 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2050 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2050 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2050 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2025 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.20% |
| Fidelity Freedom 2025 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.40% |
| Fidelity Freedom 2025 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Freedom 2025 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Freedom 2025 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2025 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2025 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2025 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2025 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2025 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2025 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.40% |
| Fidelity Freedom 2025 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.30% |
| Fidelity Freedom 2025 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2025 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.90% |
| Fidelity Freedom 2025 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2010 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.10% |
| Fidelity Freedom 2010 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| Fidelity Freedom 2010 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Freedom 2010 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom 2010 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2010 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Freedom 2010 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Freedom 2010 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2010 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2010 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2010 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.80% |
| Fidelity Freedom 2010 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| Fidelity Freedom 2010 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| Fidelity Freedom 2010 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| Fidelity Freedom 2010 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2065 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2065 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2065 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2065 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2065 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2065 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2065 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2065 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2065 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2065 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2065 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2065 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2065 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2065 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2065 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2070 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.10% |
| Fidelity Freedom 2070 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.50% |
| Fidelity Freedom 2070 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| Fidelity Freedom 2070 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2070 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2070 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2070 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2070 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Freedom 2070 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Freedom 2070 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Freedom 2070 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Freedom 2070 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.90% |
| Fidelity Freedom 2070 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51% |
| Fidelity Freedom 2070 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Freedom 2020 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28% |
| Fidelity Freedom 2020 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2020 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Freedom 2020 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom 2020 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Freedom 2020 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Freedom 2020 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom 2020 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom 2020 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom 2020 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2020 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.10% |
| Fidelity Freedom 2020 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.10% |
| Fidelity Freedom 2020 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2020 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25% |
| Fidelity Freedom 2020 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2035 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.60% |
| Fidelity Freedom 2035 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Freedom 2035 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Freedom 2035 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Freedom 2035 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Fidelity Freedom 2035 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Fidelity Freedom 2035 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Fidelity Freedom 2035 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom 2035 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2035 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Freedom 2035 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Freedom 2035 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33% |
| Fidelity Freedom 2035 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2035 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40% |
| Fidelity Freedom 2035 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2055 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2055 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2055 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2055 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2055 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2055 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2055 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2055 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2055 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2055 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2055 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2055 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2055 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2055 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2055 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2030 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.40% |
| Fidelity Freedom 2030 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Freedom 2030 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2030 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Freedom 2030 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2030 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2030 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2030 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom 2030 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Fidelity Freedom 2030 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom 2030 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.80% |
| Fidelity Freedom 2030 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.90% |
| Fidelity Freedom 2030 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2030 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.90% |
| Fidelity Freedom 2030 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2030 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.40% |
| Fidelity Freedom 2030 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Freedom 2030 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2030 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Freedom 2030 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2030 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2030 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2030 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Freedom 2030 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.30% |
| Fidelity Freedom 2030 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom 2030 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.80% |
| Fidelity Freedom 2030 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.90% |
| Fidelity Freedom 2030 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2030 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.90% |
| Fidelity Freedom 2030 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2010 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.10% |
| Fidelity Freedom 2010 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| Fidelity Freedom 2010 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Freedom 2010 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom 2010 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2010 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Freedom 2010 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Freedom 2010 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2010 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2010 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2010 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 61.80% |
| Fidelity Freedom 2010 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.80% |
| Fidelity Freedom 2010 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| Fidelity Freedom 2010 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14% |
| Fidelity Freedom 2010 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2035 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.60% |
| Fidelity Freedom 2035 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Freedom 2035 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Freedom 2035 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| Fidelity Freedom 2035 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Fidelity Freedom 2035 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Fidelity Freedom 2035 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| Fidelity Freedom 2035 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom 2035 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2035 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Freedom 2035 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.70% |
| Fidelity Freedom 2035 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33% |
| Fidelity Freedom 2035 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2035 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40% |
| Fidelity Freedom 2035 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2045 Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2045 Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2045 Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2045 Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2045 Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2045 Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2045 Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2045 Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2045 Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2045 Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2045 Fund | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2045 Fund | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2045 Fund | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2045 Fund | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2045 Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2015 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Freedom 2015 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2015 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Freedom 2015 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.70% |
| Fidelity Freedom 2015 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Freedom 2015 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2015 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Freedom 2015 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Freedom 2015 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Freedom 2015 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| Fidelity Freedom 2015 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.50% |
| Fidelity Freedom 2015 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.40% |
| Fidelity Freedom 2015 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2015 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.50% |
| Fidelity Freedom 2015 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2020 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28% |
| Fidelity Freedom 2020 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2020 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.40% |
| Fidelity Freedom 2020 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Freedom 2020 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| Fidelity Freedom 2020 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.40% |
| Fidelity Freedom 2020 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom 2020 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| Fidelity Freedom 2020 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| Fidelity Freedom 2020 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Freedom 2020 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 49.10% |
| Fidelity Freedom 2020 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.10% |
| Fidelity Freedom 2020 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Freedom 2020 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25% |
| Fidelity Freedom 2020 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Freedom 2060 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2060 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2060 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2060 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2060 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2060 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2060 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2060 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2060 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2060 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2060 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2060 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2060 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2060 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2060 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2065 Fund - Class K6 | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Freedom 2065 Fund - Class K6 | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.70% |
| Fidelity Freedom 2065 Fund - Class K6 | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity Freedom 2065 Fund - Class K6 | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2065 Fund - Class K6 | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2065 Fund - Class K6 | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Freedom 2065 Fund - Class K6 | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| Fidelity Freedom 2065 Fund - Class K6 | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Freedom 2065 Fund - Class K6 | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Freedom 2065 Fund - Class K6 | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Freedom 2065 Fund - Class K6 | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Freedom 2065 Fund - Class K6 | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 41.30% |
| Fidelity Freedom 2065 Fund - Class K6 | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2065 Fund - Class K6 | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 52.20% |
| Fidelity Freedom 2065 Fund - Class K6 | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Freedom 2040 Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.10% |
| Fidelity Freedom 2040 Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity Freedom 2040 Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| Fidelity Freedom 2040 Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2040 Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2040 Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| Fidelity Freedom 2040 Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Fidelity Freedom 2040 Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Freedom 2040 Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Freedom 2040 Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Freedom 2040 Fund - Class K | AABondFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.30% |
| Fidelity Freedom 2040 Fund - Class K | AAInternationalEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38.70% |
| Fidelity Freedom 2040 Fund - Class K | AAShortTermFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Freedom 2040 Fund - Class K | AADomesticEquityFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 48.70% |
| Fidelity Freedom 2040 Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
