| Form N-CSR Cover | 6 Months Ended |
| Dec. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Fidelity Hastings Street Trust |
| Entity Central Index Key | 0000035348 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Dec. 31, 2024 |
| Shareholder Report | 6 Months Ended |
| Dec. 31, 2024 USD ($) shares | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | Fidelity Hastings Street Trust |
| Entity Central Index Key | 0000035348 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Dec. 31, 2024 |
| Fidelity Series Large Cap Stock Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Series Large Cap Stock Fund |
| Class Name | Fidelity® Series Large Cap Stock Fund |
| Trading Symbol | FGLGX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Series Large Cap Stock Fund for the period July 1, 2024 to December 31, 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. |
| Additional Information Phone Number | 1-800-544-8544 |
| 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® Series Large Cap Stock Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Net Assets | $ 19,815,102,980 |
| Holdings Count | shares | 179 |
| Investment Company Portfolio Turnover | 14% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of December 31, 2024) KEY FACTS Fund Size $ Number of Holdings 179 Portfolio Turnover 14 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 23.0 Financials 17.9 Industrials 17.0 Health Care 10.8 Communication Services 10.3 Energy 8.1 Consumer Staples 4.9 Consumer Discretionary 3.1 Materials 1.6 Utilities 1.1 Real Estate 0.7 Common Stocks 98.5 Short-Term Investments and Net Other Assets (Liabilities) 1.5 ASSET ALLOCATION (% of Fund's net assets) Common Stocks - 98.5 Short-Term Investments and Net Other Assets (Liabilities) - 1.5 United States 91.8 Canada 1.6 Germany 1.1 Zambia 1.1 Belgium 0.9 Netherlands 0.8 United Kingdom 0.7 France 0.6 Taiwan 0.5 Others 0.9 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) United States - 91.8 Canada - 1.6 Germany - 1.1 Zambia - 1.1 Belgium - 0.9 Netherlands - 0.8 United Kingdom - 0.7 France - 0.6 Taiwan - 0.5 Others - 0.9 |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Microsoft Corp 6.8 Wells Fargo & Co 6.5 NVIDIA Corp 5.2 GE Aerospace 4.9 Exxon Mobil Corp 4.5 Boeing Co 3.4 Apple Inc 3.0 Meta Platforms Inc Class A 3.0 GE Vernova Inc 2.8 Bank of America Corp 2.7 42.8 |
| Fidelity Advisor Mega Cap Stock Fund - Class M | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mega Cap Stock Fund |
| Class Name | Fidelity Advisor® Mega Cap Stock Fund Class M |
| Trading Symbol | FTGRX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mega Cap Stock Fund for the period July 1, 2024 to December 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| 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 M $ 1.11 % |
| Expenses Paid, Amount | $ 58 |
| Expense Ratio, Percent | 1.11% |
| Net Assets | $ 3,465,743,175 |
| Holdings Count | shares | 112 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of December 31, 2024) KEY FACTS Fund Size $ Number of Holdings 112 Portfolio Turnover 11 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 25.9 Financials 16.3 Industrials 14.1 Communication Services 11.0 Health Care 7.9 Energy 7.8 Consumer Staples 5.3 Consumer Discretionary 2.8 Materials 1.1 Utilities 0.9 Real Estate 0.7 Common Stocks 93.8 Short-Term Investments and Net Other Assets (Liabilities) 6.2 ASSET ALLOCATION (% of Fund's net assets) Common Stocks - 93.8 Short-Term Investments and Net Other Assets (Liabilities) - 6.2 United States 93.8 Canada 1.1 Germany 1.0 Taiwan 0.9 United Kingdom 0.9 Zambia 0.8 Netherlands 0.8 France 0.6 Korea (South) 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) United States - 93.8 Canada - 1.1 Germany - 1.0 Taiwan - 0.9 United Kingdom - 0.9 Zambia - 0.8 Netherlands - 0.8 France - 0.6 Korea (South) - 0.1 |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Microsoft Corp 7.4 Wells Fargo & Co 6.2 NVIDIA Corp 6.0 GE Aerospace 4.8 Exxon Mobil Corp 4.5 Apple Inc 3.9 Boeing Co 3.6 Meta Platforms Inc Class A 3.5 Bank of America Corp 3.1 Alphabet Inc Class A 2.8 45.8 |
| Fidelity Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Fund |
| Class Name | Fidelity® Fund |
| Trading Symbol | FFIDX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Fund for the period July 1, 2024 to December 31, 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® Fund $ 0.42 % |
| Expenses Paid, Amount | $ 22 |
| Expense Ratio, Percent | 0.42% |
| Net Assets | $ 8,356,123,827 |
| Holdings Count | shares | 130 |
| Investment Company Portfolio Turnover | 25% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of December 31, 2024) KEY FACTS Fund Size $ Number of Holdings 130 Portfolio Turnover 25 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 31.6 Communication Services 16.5 Consumer Discretionary 14.1 Health Care 10.6 Financials 9.6 Industrials 9.0 Energy 2.8 Materials 2.0 Utilities 1.3 Consumer Staples 1.1 Common Stocks 98.6 Short-Term Investments and Net Other Assets (Liabilities) 1.4 ASSET ALLOCATION (% of Fund's net assets) Common Stocks - 98.6 Short-Term Investments and Net Other Assets (Liabilities) - 1.4 United States 92.3 Taiwan 1.4 Canada 1.2 Netherlands 1.1 United Kingdom 0.9 Italy 0.8 India 0.6 Korea (South) 0.5 Japan 0.4 Others 0.8 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) United States - 92.3 Taiwan - 1.4 Canada - 1.2 Netherlands - 1.1 United Kingdom - 0.9 Italy - 0.8 India - 0.6 Korea (South) - 0.5 Japan - 0.4 Others - 0.8 |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Alphabet Inc Class A 9.0 Microsoft Corp 8.9 NVIDIA Corp 8.2 Amazon.com Inc 5.8 Apple Inc 5.6 Meta Platforms Inc Class A 5.3 Eli Lilly & Co 2.6 Wells Fargo & Co 2.1 Netflix Inc 2.0 UnitedHealth Group Inc 1.6 51.1 |
| Fidelity Growth Discovery Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Growth Discovery Fund |
| Class Name | Fidelity® Growth Discovery Fund Class K |
| Trading Symbol | FGDKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Growth Discovery Fund for the period July 1, 2024 to December 31, 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 | $ 30 |
| Expense Ratio, Percent | 0.59% |
| Net Assets | $ 6,346,897,233 |
| Holdings Count | shares | 144 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of December 31, 2024) KEY FACTS Fund Size $ Number of Holdings 144 Portfolio Turnover 58 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 40.0 Health Care 16.1 Consumer Discretionary 11.6 Communication Services 8.9 Industrials 8.4 Financials 7.7 Consumer Staples 1.6 Energy 1.5 Materials 1.5 Real Estate 0.6 Common Stocks 97.7 Preferred Stocks 0.2 Preferred Securities 0.0 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 2.1 ASSET ALLOCATION (% of Fund's net assets) Common Stocks - 97.7 Preferred Stocks - 0.2 Preferred Securities - 0.0 Bonds - 0.0 Short-Term Investments and Net Other Assets (Liabilities) - 2.1 United States 88.6 Taiwan 5.1 China 2.5 Brazil 0.8 Israel 0.7 Belgium 0.6 Netherlands 0.5 Germany 0.4 Japan 0.3 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) United States - 88.6 Taiwan - 5.1 China - 2.5 Brazil - 0.8 Israel - 0.7 Belgium - 0.6 Netherlands - 0.5 Germany - 0.4 Japan - 0.3 Others - 0.5 |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) NVIDIA Corp 12.6 Apple Inc 11.4 Alphabet Inc Class A 5.4 Amazon.com Inc 5.2 Taiwan Semiconductor Manufacturing Co Ltd ADR 5.0 Microsoft Corp 4.9 Boston Scientific Corp 2.8 Eli Lilly & Co 2.3 Meta Platforms Inc Class A 1.9 Mastercard Inc Class A 1.8 53.3 |
| Fidelity Growth Discovery Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Growth Discovery Fund |
| Class Name | Fidelity® Growth Discovery Fund |
| Trading Symbol | FDSVX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Growth Discovery Fund for the period July 1, 2024 to December 31, 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® Growth Discovery Fund $ 0.66 % |
| Expenses Paid, Amount | $ 34 |
| Expense Ratio, Percent | 0.66% |
| Net Assets | $ 6,346,897,233 |
| Holdings Count | shares | 144 |
| Investment Company Portfolio Turnover | 58% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of December 31, 2024) KEY FACTS Fund Size $ Number of Holdings 144 Portfolio Turnover 58 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 40.0 Health Care 16.1 Consumer Discretionary 11.6 Communication Services 8.9 Industrials 8.4 Financials 7.7 Consumer Staples 1.6 Energy 1.5 Materials 1.5 Real Estate 0.6 Common Stocks 97.7 Preferred Stocks 0.2 Preferred Securities 0.0 Bonds 0.0 Short-Term Investments and Net Other Assets (Liabilities) 2.1 ASSET ALLOCATION (% of Fund's net assets) Common Stocks - 97.7 Preferred Stocks - 0.2 Preferred Securities - 0.0 Bonds - 0.0 Short-Term Investments and Net Other Assets (Liabilities) - 2.1 United States 88.6 Taiwan 5.1 China 2.5 Brazil 0.8 Israel 0.7 Belgium 0.6 Netherlands 0.5 Germany 0.4 Japan 0.3 Others 0.5 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) United States - 88.6 Taiwan - 5.1 China - 2.5 Brazil - 0.8 Israel - 0.7 Belgium - 0.6 Netherlands - 0.5 Germany - 0.4 Japan - 0.3 Others - 0.5 |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) NVIDIA Corp 12.6 Apple Inc 11.4 Alphabet Inc Class A 5.4 Amazon.com Inc 5.2 Taiwan Semiconductor Manufacturing Co Ltd ADR 5.0 Microsoft Corp 4.9 Boston Scientific Corp 2.8 Eli Lilly & Co 2.3 Meta Platforms Inc Class A 1.9 Mastercard Inc Class A 1.8 53.3 |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mega Cap Stock Fund |
| Class Name | Fidelity Advisor® Mega Cap Stock Fund Class Z |
| Trading Symbol | FZALX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mega Cap Stock Fund for the period July 1, 2024 to December 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| 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 Z $ 0.47 % |
| Expenses Paid, Amount | $ 24 |
| Expense Ratio, Percent | 0.47% |
| Net Assets | $ 3,465,743,175 |
| Holdings Count | shares | 112 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of December 31, 2024) KEY FACTS Fund Size $ Number of Holdings 112 Portfolio Turnover 11 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 25.9 Financials 16.3 Industrials 14.1 Communication Services 11.0 Health Care 7.9 Energy 7.8 Consumer Staples 5.3 Consumer Discretionary 2.8 Materials 1.1 Utilities 0.9 Real Estate 0.7 Common Stocks 93.8 Short-Term Investments and Net Other Assets (Liabilities) 6.2 ASSET ALLOCATION (% of Fund's net assets) Common Stocks - 93.8 Short-Term Investments and Net Other Assets (Liabilities) - 6.2 United States 93.8 Canada 1.1 Germany 1.0 Taiwan 0.9 United Kingdom 0.9 Zambia 0.8 Netherlands 0.8 France 0.6 Korea (South) 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) United States - 93.8 Canada - 1.1 Germany - 1.0 Taiwan - 0.9 United Kingdom - 0.9 Zambia - 0.8 Netherlands - 0.8 France - 0.6 Korea (South) - 0.1 |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Microsoft Corp 7.4 Wells Fargo & Co 6.2 NVIDIA Corp 6.0 GE Aerospace 4.8 Exxon Mobil Corp 4.5 Apple Inc 3.9 Boeing Co 3.6 Meta Platforms Inc Class A 3.5 Bank of America Corp 3.1 Alphabet Inc Class A 2.8 45.8 |
| Fidelity Advisor Mega Cap Stock Fund - Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mega Cap Stock Fund |
| Class Name | Fidelity Advisor® Mega Cap Stock Fund Class A |
| Trading Symbol | FGTAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mega Cap Stock Fund for the period July 1, 2024 to December 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| 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 A $ 0.86 % |
| Expenses Paid, Amount | $ 45 |
| Expense Ratio, Percent | 0.86% |
| Net Assets | $ 3,465,743,175 |
| Holdings Count | shares | 112 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of December 31, 2024) KEY FACTS Fund Size $ Number of Holdings 112 Portfolio Turnover 11 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 25.9 Financials 16.3 Industrials 14.1 Communication Services 11.0 Health Care 7.9 Energy 7.8 Consumer Staples 5.3 Consumer Discretionary 2.8 Materials 1.1 Utilities 0.9 Real Estate 0.7 Common Stocks 93.8 Short-Term Investments and Net Other Assets (Liabilities) 6.2 ASSET ALLOCATION (% of Fund's net assets) Common Stocks - 93.8 Short-Term Investments and Net Other Assets (Liabilities) - 6.2 United States 93.8 Canada 1.1 Germany 1.0 Taiwan 0.9 United Kingdom 0.9 Zambia 0.8 Netherlands 0.8 France 0.6 Korea (South) 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) United States - 93.8 Canada - 1.1 Germany - 1.0 Taiwan - 0.9 United Kingdom - 0.9 Zambia - 0.8 Netherlands - 0.8 France - 0.6 Korea (South) - 0.1 |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Microsoft Corp 7.4 Wells Fargo & Co 6.2 NVIDIA Corp 6.0 GE Aerospace 4.8 Exxon Mobil Corp 4.5 Apple Inc 3.9 Boeing Co 3.6 Meta Platforms Inc Class A 3.5 Bank of America Corp 3.1 Alphabet Inc Class A 2.8 45.8 |
| Fidelity Advisor Mega Cap Stock Fund - Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mega Cap Stock Fund |
| Class Name | Fidelity Advisor® Mega Cap Stock Fund Class I |
| Trading Symbol | FTRIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mega Cap Stock Fund for the period July 1, 2024 to December 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| 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 I $ 0.59 % |
| Expenses Paid, Amount | $ 31 |
| Expense Ratio, Percent | 0.59% |
| Net Assets | $ 3,465,743,175 |
| Holdings Count | shares | 112 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of December 31, 2024) KEY FACTS Fund Size $ Number of Holdings 112 Portfolio Turnover 11 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 25.9 Financials 16.3 Industrials 14.1 Communication Services 11.0 Health Care 7.9 Energy 7.8 Consumer Staples 5.3 Consumer Discretionary 2.8 Materials 1.1 Utilities 0.9 Real Estate 0.7 Common Stocks 93.8 Short-Term Investments and Net Other Assets (Liabilities) 6.2 ASSET ALLOCATION (% of Fund's net assets) Common Stocks - 93.8 Short-Term Investments and Net Other Assets (Liabilities) - 6.2 United States 93.8 Canada 1.1 Germany 1.0 Taiwan 0.9 United Kingdom 0.9 Zambia 0.8 Netherlands 0.8 France 0.6 Korea (South) 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) United States - 93.8 Canada - 1.1 Germany - 1.0 Taiwan - 0.9 United Kingdom - 0.9 Zambia - 0.8 Netherlands - 0.8 France - 0.6 Korea (South) - 0.1 |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Microsoft Corp 7.4 Wells Fargo & Co 6.2 NVIDIA Corp 6.0 GE Aerospace 4.8 Exxon Mobil Corp 4.5 Apple Inc 3.9 Boeing Co 3.6 Meta Platforms Inc Class A 3.5 Bank of America Corp 3.1 Alphabet Inc Class A 2.8 45.8 |
| Fidelity Fund - Class K | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Fund |
| Class Name | Fidelity® Fund Class K |
| Trading Symbol | FFDKX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Fund for the period July 1, 2024 to December 31, 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 $ 0.34 % |
| Expenses Paid, Amount | $ 18 |
| Expense Ratio, Percent | 0.34% |
| Net Assets | $ 8,356,123,827 |
| Holdings Count | shares | 130 |
| Investment Company Portfolio Turnover | 25% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of December 31, 2024) KEY FACTS Fund Size $ Number of Holdings 130 Portfolio Turnover 25 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 31.6 Communication Services 16.5 Consumer Discretionary 14.1 Health Care 10.6 Financials 9.6 Industrials 9.0 Energy 2.8 Materials 2.0 Utilities 1.3 Consumer Staples 1.1 Common Stocks 98.6 Short-Term Investments and Net Other Assets (Liabilities) 1.4 ASSET ALLOCATION (% of Fund's net assets) Common Stocks - 98.6 Short-Term Investments and Net Other Assets (Liabilities) - 1.4 United States 92.3 Taiwan 1.4 Canada 1.2 Netherlands 1.1 United Kingdom 0.9 Italy 0.8 India 0.6 Korea (South) 0.5 Japan 0.4 Others 0.8 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) United States - 92.3 Taiwan - 1.4 Canada - 1.2 Netherlands - 1.1 United Kingdom - 0.9 Italy - 0.8 India - 0.6 Korea (South) - 0.5 Japan - 0.4 Others - 0.8 |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Alphabet Inc Class A 9.0 Microsoft Corp 8.9 NVIDIA Corp 8.2 Amazon.com Inc 5.8 Apple Inc 5.6 Meta Platforms Inc Class A 5.3 Eli Lilly & Co 2.6 Wells Fargo & Co 2.1 Netflix Inc 2.0 UnitedHealth Group Inc 1.6 51.1 |
| Fidelity Mega Cap Stock Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mega Cap Stock Fund |
| Class Name | Fidelity® Mega Cap Stock Fund |
| Trading Symbol | FGRTX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mega Cap Stock Fund for the period July 1, 2024 to December 31, 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® Mega Cap Stock Fund $ 0.58 % |
| Expenses Paid, Amount | $ 30 |
| Expense Ratio, Percent | 0.58% |
| Net Assets | $ 3,465,743,175 |
| Holdings Count | shares | 112 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of December 31, 2024) KEY FACTS Fund Size $ Number of Holdings 112 Portfolio Turnover 11 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 25.9 Financials 16.3 Industrials 14.1 Communication Services 11.0 Health Care 7.9 Energy 7.8 Consumer Staples 5.3 Consumer Discretionary 2.8 Materials 1.1 Utilities 0.9 Real Estate 0.7 Common Stocks 93.8 Short-Term Investments and Net Other Assets (Liabilities) 6.2 ASSET ALLOCATION (% of Fund's net assets) Common Stocks - 93.8 Short-Term Investments and Net Other Assets (Liabilities) - 6.2 United States 93.8 Canada 1.1 Germany 1.0 Taiwan 0.9 United Kingdom 0.9 Zambia 0.8 Netherlands 0.8 France 0.6 Korea (South) 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) United States - 93.8 Canada - 1.1 Germany - 1.0 Taiwan - 0.9 United Kingdom - 0.9 Zambia - 0.8 Netherlands - 0.8 France - 0.6 Korea (South) - 0.1 |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Microsoft Corp 7.4 Wells Fargo & Co 6.2 NVIDIA Corp 6.0 GE Aerospace 4.8 Exxon Mobil Corp 4.5 Apple Inc 3.9 Boeing Co 3.6 Meta Platforms Inc Class A 3.5 Bank of America Corp 3.1 Alphabet Inc Class A 2.8 45.8 |
| Fidelity Advisor Mega Cap Stock Fund - Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Mega Cap Stock Fund |
| Class Name | Fidelity Advisor® Mega Cap Stock Fund Class C |
| Trading Symbol | FGRCX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains information about Fidelity® Mega Cap Stock Fund for the period July 1, 2024 to December 31, 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 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com. |
| Additional Information Phone Number | 1-877-208-0098 |
| 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 C $ 1.63 % |
| Expenses Paid, Amount | $ 85 |
| Expense Ratio, Percent | 1.63% |
| Net Assets | $ 3,465,743,175 |
| Holdings Count | shares | 112 |
| Investment Company Portfolio Turnover | 11% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of December 31, 2024) KEY FACTS Fund Size $ Number of Holdings 112 Portfolio Turnover 11 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 25.9 Financials 16.3 Industrials 14.1 Communication Services 11.0 Health Care 7.9 Energy 7.8 Consumer Staples 5.3 Consumer Discretionary 2.8 Materials 1.1 Utilities 0.9 Real Estate 0.7 Common Stocks 93.8 Short-Term Investments and Net Other Assets (Liabilities) 6.2 ASSET ALLOCATION (% of Fund's net assets) Common Stocks - 93.8 Short-Term Investments and Net Other Assets (Liabilities) - 6.2 United States 93.8 Canada 1.1 Germany 1.0 Taiwan 0.9 United Kingdom 0.9 Zambia 0.8 Netherlands 0.8 France 0.6 Korea (South) 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) United States - 93.8 Canada - 1.1 Germany - 1.0 Taiwan - 0.9 United Kingdom - 0.9 Zambia - 0.8 Netherlands - 0.8 France - 0.6 Korea (South) - 0.1 |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Microsoft Corp 7.4 Wells Fargo & Co 6.2 NVIDIA Corp 6.0 GE Aerospace 4.8 Exxon Mobil Corp 4.5 Apple Inc 3.9 Boeing Co 3.6 Meta Platforms Inc Class A 3.5 Bank of America Corp 3.1 Alphabet Inc Class A 2.8 45.8 |
| Shareholder Report, Holdings (Details) | Dec. 31, 2024 |
| Fidelity Series Large Cap Stock Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Series Large Cap Stock Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity Series Large Cap Stock Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Series Large Cap Stock Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Series Large Cap Stock Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Series Large Cap Stock Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Series Large Cap Stock Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Series Large Cap Stock Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| Fidelity Series Large Cap Stock Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Series Large Cap Stock Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Series Large Cap Stock Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.90% |
| Fidelity Series Large Cap Stock Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23% |
| Fidelity Series Large Cap Stock Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.80% |
| Fidelity Series Large Cap Stock Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Series Large Cap Stock Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17% |
| Fidelity Series Large Cap Stock Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Series Large Cap Stock Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Series Large Cap Stock Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Series Large Cap Stock Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.30% |
| Fidelity Series Large Cap Stock Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Fidelity Series Large Cap Stock Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Series Large Cap Stock Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 91.80% |
| Fidelity Series Large Cap Stock Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Series Large Cap Stock Fund | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Series Large Cap Stock Fund | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Series Large Cap Stock Fund | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Series Large Cap Stock Fund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Series Large Cap Stock Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Series Large Cap Stock Fund | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Series Large Cap Stock Fund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Series Large Cap Stock Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Series Large Cap Stock Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.50% |
| Fidelity Series Large Cap Stock Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class M | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| Fidelity Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| Fidelity Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| Fidelity Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.50% |
| Fidelity Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.30% |
| Fidelity Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Fund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Fund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Fund | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Fund | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Fund | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Fund | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.60% |
| Fidelity Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Growth Discovery Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.60% |
| Fidelity Growth Discovery Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.40% |
| Fidelity Growth Discovery Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Growth Discovery Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Growth Discovery Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Growth Discovery Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Growth Discovery Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Growth Discovery Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Growth Discovery Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Growth Discovery Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Growth Discovery Fund - Class K | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| Fidelity Growth Discovery Fund - Class K | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40% |
| Fidelity Growth Discovery Fund - Class K | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.10% |
| Fidelity Growth Discovery Fund - Class K | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Growth Discovery Fund - Class K | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Growth Discovery Fund - Class K | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Growth Discovery Fund - Class K | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Growth Discovery Fund - Class K | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Growth Discovery Fund - Class K | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| Fidelity Growth Discovery Fund - Class K | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Growth Discovery Fund - Class K | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 88.60% |
| Fidelity Growth Discovery Fund - Class K | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Growth Discovery Fund - Class K | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Growth Discovery Fund - Class K | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Growth Discovery Fund - Class K | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Fidelity Growth Discovery Fund - Class K | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Growth Discovery Fund - Class K | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Growth Discovery Fund - Class K | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Growth Discovery Fund - Class K | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Growth Discovery Fund - Class K | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Growth Discovery Fund - Class K | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.70% |
| Fidelity Growth Discovery Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Growth Discovery Fund - Class K | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Growth Discovery Fund - Class K | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Growth Discovery Fund - Class K | AABondsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Growth Discovery Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.60% |
| Fidelity Growth Discovery Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.40% |
| Fidelity Growth Discovery Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.40% |
| Fidelity Growth Discovery Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity Growth Discovery Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Growth Discovery Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.90% |
| Fidelity Growth Discovery Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Growth Discovery Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Growth Discovery Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| Fidelity Growth Discovery Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity Growth Discovery Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| Fidelity Growth Discovery Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40% |
| Fidelity Growth Discovery Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.10% |
| Fidelity Growth Discovery Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Growth Discovery Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| Fidelity Growth Discovery Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Growth Discovery Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| Fidelity Growth Discovery Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Growth Discovery Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| Fidelity Growth Discovery Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| Fidelity Growth Discovery Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 88.60% |
| Fidelity Growth Discovery Fund | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Growth Discovery Fund | Belgium | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Growth Discovery Fund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Growth Discovery Fund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.10% |
| Fidelity Growth Discovery Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Growth Discovery Fund | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Growth Discovery Fund | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Growth Discovery Fund | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Growth Discovery Fund | Israel | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Growth Discovery Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.70% |
| Fidelity Growth Discovery Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Growth Discovery Fund | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Growth Discovery Fund | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Growth Discovery Fund | AABondsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class Z | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class A | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class I | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Fund - Class K | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity Fund - Class K | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.90% |
| Fidelity Fund - Class K | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| Fidelity Fund - Class K | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Fund - Class K | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.60% |
| Fidelity Fund - Class K | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Fund - Class K | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Fund - Class K | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Fund - Class K | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Fund - Class K | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Fund - Class K | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.60% |
| Fidelity Fund - Class K | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.60% |
| Fidelity Fund - Class K | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.60% |
| Fidelity Fund - Class K | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity Fund - Class K | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Fund - Class K | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Fund - Class K | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Fund - Class K | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.50% |
| Fidelity Fund - Class K | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Fund - Class K | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity Fund - Class K | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 92.30% |
| Fidelity Fund - Class K | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Fund - Class K | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Fund - Class K | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Fund - Class K | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Fund - Class K | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Fund - Class K | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Fund - Class K | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Fund - Class K | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Fund - Class K | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Fund - Class K | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.60% |
| Fidelity Fund - Class K | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Mega Cap Stock Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Mega Cap Stock Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Mega Cap Stock Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Mega Cap Stock Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Mega Cap Stock Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Mega Cap Stock Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Mega Cap Stock Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Mega Cap Stock Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Mega Cap Stock Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Mega Cap Stock Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Mega Cap Stock Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Fidelity Mega Cap Stock Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.90% |
| Fidelity Mega Cap Stock Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Mega Cap Stock Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Mega Cap Stock Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Mega Cap Stock Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Mega Cap Stock Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Mega Cap Stock Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Mega Cap Stock Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Mega Cap Stock Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Mega Cap Stock Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Mega Cap Stock Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Mega Cap Stock Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Mega Cap Stock Fund | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Mega Cap Stock Fund | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Mega Cap Stock Fund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Mega Cap Stock Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Mega Cap Stock Fund | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Mega Cap Stock Fund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Mega Cap Stock Fund | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Mega Cap Stock Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Mega Cap Stock Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.40% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.60% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.30% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Zambia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 93.80% |
| Fidelity Advisor Mega Cap Stock Fund - Class C | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
