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Shareholder Report
 6 Months Ended
Mar. 31, 2025
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity Charles Street Trust
Entity Central Index Key 0000354046
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2025
Fidelity Advisor Asset Manager 60% - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 60%
Class Name Fidelity Advisor Asset Manager® 60% Class M
Trading Symbol FSATX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 60% for the period October 1, 2024 to March 31, 2025.
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 
$ 56 
1.15%
  
Expenses Paid, Amount $ 56
Expense Ratio, Percent 1.15%
Net Assets $ 4,203,564,524
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,203,564,524
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 19.2 AAA 2.4 AA 0.2 A 2.3 BBB 5.2 BB 1.1 B 0.9 CCC,CC,C 0.3 D 0.0 Not Rated 1.5 Equities 62.7 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 19.2   AAA - 2.4                                  AA - 0.2                                   A - 2.3                                    BBB - 5.2                                  BB - 1.1                                   B - 0.9                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.5                            Equities - 62.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.0   Information Technology 12.3   Industrials 7.4   Consumer Discretionary 6.2   Health Care 5.3   Communication Services 5.2   Energy 2.7   Consumer Staples 2.6   Materials 1.9   Real Estate 1.9   Utilities 1.5     Equities 61.6 Bonds 34.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 61.6                            Bonds - 34.2                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 11.9   US Treasury Bonds 3.2   Fidelity Enhanced Small Cap ETF 2.4   Apple Inc 2.3   Fidelity Blue Chip Growth ETF 2.0   NVIDIA Corp 1.9   Microsoft Corp 1.8   Fannie Mae Mortgage pass-thru certificates 1.3   Amazon.com Inc 1.3   Freddie Mac Gold Pool 1.1     29.2  
Fidelity Advisor Asset Manager 40% - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 40%
Class Name Fidelity Advisor Asset Manager® 40% Class I
Trading Symbol FFNIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 40% for the period October 1, 2024 to March 31, 2025.
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 
$ 25 
0.50%
  
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.50%
Net Assets $ 2,220,406,588
Holdings Count | shares 28
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,220,406,588
  
Number of Holdings
28
  
Portfolio Turnover
34%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 25.0 AAA 3.3 AA 0.3 A 2.5 BBB 7.6 BB 1.2 B 1.1 CCC,CC,C 0.2 D 0.0 Not Rated 2.0 Equities 46.0 Short-Term Investments and Net Other Assets (Liabilities) 10.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 25.0   AAA - 3.3                                  AA - 0.3                                   A - 2.5                                    BBB - 7.6                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 2.0                            Equities - 46.0                            Short-Term Investments and Net Other Assets (Liabilities) - 10.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 45.0 Bonds 44.2 Short-Term Investments and Net Other Assets (Liabilities) 10.8 ASSET ALLOCATION (% of Fund's net assets)     Equities - 45.0                            Bonds - 44.2                               Short-Term Investments and Net Other Assets (Liabilities) - 10.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 15.2   US Treasury Bonds 4.3   Fidelity Enhanced Small Cap ETF 1.9   Fannie Mae Mortgage pass-thru certificates 1.8   Apple Inc 1.7   Fidelity Blue Chip Growth ETF 1.5   Freddie Mac Gold Pool 1.5   Ginnie Mae II Pool 1.5   NVIDIA Corp 1.4   Microsoft Corp 1.3     32.1  
Fidelity Sustainable Multi-Asset Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Sustainable Multi-Asset Fund
Class Name Fidelity® Sustainable Multi-Asset Fund
Trading Symbol FYMRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Sustainable Multi-Asset Fund for the period October 1, 2024 to March 31, 2025.
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® Sustainable Multi-Asset Fund 
$ 2 
0.05%
  
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.05%
Net Assets $ 32,437,709
Holdings Count | shares 8
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$32,437,709
  
Number of Holdings
8
  
Portfolio Turnover
35%
  
Holdings [Text Block]         Domestic Equity Funds 40.3 International Equity Funds 35.5 Bond Funds 24.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 40.3               International Equity Funds - 35.5          Bond Funds - 24.2                          Short-Term Investments and Net Other Assets (Liabilities) - 0.0  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity U.S. Sustainability Index Fund 28.4   Fidelity Sustainable International Equity Fund 14.9   Fidelity International Sustainability Index Fund 13.9   Fidelity Sustainable Core Plus Bond Fund 13.3   Fidelity Sustainable U.S. Equity ETF 11.9   Fidelity Inflation-Protected Bond Index Fund 7.6   Fidelity Sustainable Emerging Markets Equity Fund 6.7   Fidelity Long-Term Treasury Bond Index Fund 3.3     100.0  
Fidelity Advisor Asset Manager 85% - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 85%
Class Name Fidelity Advisor Asset Manager® 85% Class A
Trading Symbol FEYAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 85% for the period October 1, 2024 to March 31, 2025.
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 
$ 44 
0.89%
  
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.89%
Net Assets $ 4,470,422,828
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,470,422,828
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.7 AAA 0.5 AA 0.1 A 0.4 BBB 1.8 BB 0.6 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 0.8 Equities 85.6 Short-Term Investments and Net Other Assets (Liabilities) 2.4 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.7   AAA - 0.5                                  AA - 0.1                                   A - 0.4                                    BBB - 1.8                                  BB - 0.6                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 0.8                            Equities - 85.6                            Short-Term Investments and Net Other Assets (Liabilities) - 2.4   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 16.7   Information Technology 16.3   Industrials 9.7   Consumer Discretionary 8.0   Health Care 7.2   Communication Services 6.4   Consumer Staples 3.8   Materials 2.9   Energy 2.8   Real Estate 1.8   Utilities 1.6     Equities 84.5 Bonds 13.1 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 84.5                            Bonds - 13.1                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.3   Apple Inc 3.0   Fidelity Blue Chip Growth ETF 2.7   NVIDIA Corp 2.6   Microsoft Corp 2.5   Amazon.com Inc 1.7   Fidelity Fundamental Small-Mid Cap ETF 1.4   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Alphabet Inc Class A 1.3     24.7  
Fidelity Advisor Sustainable Multi-Asset Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity® Sustainable Multi-Asset Fund
Class Name Fidelity Advisor® Sustainable Multi-Asset Fund Class A
Trading Symbol FYMAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Sustainable Multi-Asset Fund for the period October 1, 2024 to March 31, 2025.
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 
$ 15 
0.30%
  
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.30%
Net Assets $ 32,437,709
Holdings Count | shares 8
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$32,437,709
  
Number of Holdings
8
  
Portfolio Turnover
35%
  
Holdings [Text Block]         Domestic Equity Funds 40.3 International Equity Funds 35.5 Bond Funds 24.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 40.3               International Equity Funds - 35.5          Bond Funds - 24.2                          Short-Term Investments and Net Other Assets (Liabilities) - 0.0  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity U.S. Sustainability Index Fund 28.4   Fidelity Sustainable International Equity Fund 14.9   Fidelity International Sustainability Index Fund 13.9   Fidelity Sustainable Core Plus Bond Fund 13.3   Fidelity Sustainable U.S. Equity ETF 11.9   Fidelity Inflation-Protected Bond Index Fund 7.6   Fidelity Sustainable Emerging Markets Equity Fund 6.7   Fidelity Long-Term Treasury Bond Index Fund 3.3     100.0  
Fidelity Advisor Asset Manager 60% - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 60%
Class Name Fidelity Advisor Asset Manager® 60% Class Z
Trading Symbol FIQAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 60% for the period October 1, 2024 to March 31, 2025.
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 
$ 26 
0.53%
  
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.53%
Net Assets $ 4,203,564,524
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,203,564,524
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 19.2 AAA 2.4 AA 0.2 A 2.3 BBB 5.2 BB 1.1 B 0.9 CCC,CC,C 0.3 D 0.0 Not Rated 1.5 Equities 62.7 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 19.2   AAA - 2.4                                  AA - 0.2                                   A - 2.3                                    BBB - 5.2                                  BB - 1.1                                   B - 0.9                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.5                            Equities - 62.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.0   Information Technology 12.3   Industrials 7.4   Consumer Discretionary 6.2   Health Care 5.3   Communication Services 5.2   Energy 2.7   Consumer Staples 2.6   Materials 1.9   Real Estate 1.9   Utilities 1.5     Equities 61.6 Bonds 34.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 61.6                            Bonds - 34.2                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 11.9   US Treasury Bonds 3.2   Fidelity Enhanced Small Cap ETF 2.4   Apple Inc 2.3   Fidelity Blue Chip Growth ETF 2.0   NVIDIA Corp 1.9   Microsoft Corp 1.8   Fannie Mae Mortgage pass-thru certificates 1.3   Amazon.com Inc 1.3   Freddie Mac Gold Pool 1.1     29.2  
Fidelity Advisor Asset Manager 50% - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 50%
Class Name Fidelity Advisor Asset Manager® 50% Class Z
Trading Symbol FIKZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 50% for the period October 1, 2024 to March 31, 2025.
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 
$ 21 
0.43%
  
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.43%
Net Assets $ 9,283,119,180
Holdings Count | shares 27
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$9,283,119,180
  
Number of Holdings
27
  
Portfolio Turnover
35%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 22.1 AAA 2.7 AA 0.1 A 2.4 BBB 6.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 1.8 Equities 55.6 Short-Term Investments and Net Other Assets (Liabilities) 6.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 22.1   AAA - 2.7                                  AA - 0.1                                   A - 2.4                                    BBB - 6.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.8                            Equities - 55.6                            Short-Term Investments and Net Other Assets (Liabilities) - 6.3   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 54.6 Bonds 39.1 Short-Term Investments and Net Other Assets (Liabilities) 6.3 ASSET ALLOCATION (% of Fund's net assets)     Equities - 54.6                            Bonds - 39.1                               Short-Term Investments and Net Other Assets (Liabilities) - 6.3  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 13.6   US Treasury Bonds 3.7   Fidelity Enhanced Small Cap ETF 2.2   Apple Inc 2.1   Fidelity Blue Chip Growth ETF 1.8   NVIDIA Corp 1.7   Microsoft Corp 1.6   Fannie Mae Mortgage pass-thru certificates 1.5   Freddie Mac Gold Pool 1.3   Ginnie Mae II Pool 1.3     30.8  
Fidelity Advisor Asset Manager 85% - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 85%
Class Name Fidelity Advisor Asset Manager® 85% Class M
Trading Symbol FEYTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 85% for the period October 1, 2024 to March 31, 2025.
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 
$ 56 
1.14%
  
Expenses Paid, Amount $ 56
Expense Ratio, Percent 1.14%
Net Assets $ 4,470,422,828
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,470,422,828
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.7 AAA 0.5 AA 0.1 A 0.4 BBB 1.8 BB 0.6 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 0.8 Equities 85.6 Short-Term Investments and Net Other Assets (Liabilities) 2.4 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.7   AAA - 0.5                                  AA - 0.1                                   A - 0.4                                    BBB - 1.8                                  BB - 0.6                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 0.8                            Equities - 85.6                            Short-Term Investments and Net Other Assets (Liabilities) - 2.4   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 16.7   Information Technology 16.3   Industrials 9.7   Consumer Discretionary 8.0   Health Care 7.2   Communication Services 6.4   Consumer Staples 3.8   Materials 2.9   Energy 2.8   Real Estate 1.8   Utilities 1.6     Equities 84.5 Bonds 13.1 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 84.5                            Bonds - 13.1                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.3   Apple Inc 3.0   Fidelity Blue Chip Growth ETF 2.7   NVIDIA Corp 2.6   Microsoft Corp 2.5   Amazon.com Inc 1.7   Fidelity Fundamental Small-Mid Cap ETF 1.4   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Alphabet Inc Class A 1.3     24.7  
Fidelity Advisor Asset Manager 40% - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 40%
Class Name Fidelity Advisor Asset Manager® 40% Class Z
Trading Symbol FIKYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 40% for the period October 1, 2024 to March 31, 2025.
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 
$ 22 
0.44%
  
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.44%
Net Assets $ 2,220,406,588
Holdings Count | shares 28
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,220,406,588
  
Number of Holdings
28
  
Portfolio Turnover
34%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 25.0 AAA 3.3 AA 0.3 A 2.5 BBB 7.6 BB 1.2 B 1.1 CCC,CC,C 0.2 D 0.0 Not Rated 2.0 Equities 46.0 Short-Term Investments and Net Other Assets (Liabilities) 10.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 25.0   AAA - 3.3                                  AA - 0.3                                   A - 2.5                                    BBB - 7.6                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 2.0                            Equities - 46.0                            Short-Term Investments and Net Other Assets (Liabilities) - 10.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 45.0 Bonds 44.2 Short-Term Investments and Net Other Assets (Liabilities) 10.8 ASSET ALLOCATION (% of Fund's net assets)     Equities - 45.0                            Bonds - 44.2                               Short-Term Investments and Net Other Assets (Liabilities) - 10.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 15.2   US Treasury Bonds 4.3   Fidelity Enhanced Small Cap ETF 1.9   Fannie Mae Mortgage pass-thru certificates 1.8   Apple Inc 1.7   Fidelity Blue Chip Growth ETF 1.5   Freddie Mac Gold Pool 1.5   Ginnie Mae II Pool 1.5   NVIDIA Corp 1.4   Microsoft Corp 1.3     32.1  
Fidelity Advisor Sustainable Multi-Asset Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity® Sustainable Multi-Asset Fund
Class Name Fidelity Advisor® Sustainable Multi-Asset Fund Class C
Trading Symbol FYMCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Sustainable Multi-Asset Fund for the period October 1, 2024 to March 31, 2025.
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 
$ 51 
1.05%
  
Expenses Paid, Amount $ 51
Expense Ratio, Percent 1.05%
Net Assets $ 32,437,709
Holdings Count | shares 8
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$32,437,709
  
Number of Holdings
8
  
Portfolio Turnover
35%
  
Holdings [Text Block]         Domestic Equity Funds 40.3 International Equity Funds 35.5 Bond Funds 24.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 40.3               International Equity Funds - 35.5          Bond Funds - 24.2                          Short-Term Investments and Net Other Assets (Liabilities) - 0.0  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity U.S. Sustainability Index Fund 28.4   Fidelity Sustainable International Equity Fund 14.9   Fidelity International Sustainability Index Fund 13.9   Fidelity Sustainable Core Plus Bond Fund 13.3   Fidelity Sustainable U.S. Equity ETF 11.9   Fidelity Inflation-Protected Bond Index Fund 7.6   Fidelity Sustainable Emerging Markets Equity Fund 6.7   Fidelity Long-Term Treasury Bond Index Fund 3.3     100.0  
Fidelity Advisor Asset Manager 85% - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 85%
Class Name Fidelity Advisor Asset Manager® 85% Class I
Trading Symbol FEYIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 85% for the period October 1, 2024 to March 31, 2025.
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 
$ 32 
0.64%
  
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.64%
Net Assets $ 4,470,422,828
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,470,422,828
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.7 AAA 0.5 AA 0.1 A 0.4 BBB 1.8 BB 0.6 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 0.8 Equities 85.6 Short-Term Investments and Net Other Assets (Liabilities) 2.4 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.7   AAA - 0.5                                  AA - 0.1                                   A - 0.4                                    BBB - 1.8                                  BB - 0.6                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 0.8                            Equities - 85.6                            Short-Term Investments and Net Other Assets (Liabilities) - 2.4   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 16.7   Information Technology 16.3   Industrials 9.7   Consumer Discretionary 8.0   Health Care 7.2   Communication Services 6.4   Consumer Staples 3.8   Materials 2.9   Energy 2.8   Real Estate 1.8   Utilities 1.6     Equities 84.5 Bonds 13.1 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 84.5                            Bonds - 13.1                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.3   Apple Inc 3.0   Fidelity Blue Chip Growth ETF 2.7   NVIDIA Corp 2.6   Microsoft Corp 2.5   Amazon.com Inc 1.7   Fidelity Fundamental Small-Mid Cap ETF 1.4   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Alphabet Inc Class A 1.3     24.7  
Fidelity Advisor Asset Manager 30% - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 30%
Class Name Fidelity Advisor Asset Manager® 30% Class A
Trading Symbol FTAAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 30% for the period October 1, 2024 to March 31, 2025.
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 
$ 37 
0.74%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.74%
Net Assets $ 1,956,867,191
Holdings Count | shares 30
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,956,867,191
  
Number of Holdings
30
  
Portfolio Turnover
31%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 28.1 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 41.8 Short-Term Investments and Net Other Assets (Liabilities) 9.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 28.1   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 41.8                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.6 Equities 35.6 Short-Term Investments and Net Other Assets (Liabilities) 9.8 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.6                               Equities - 35.6                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 17.0   Fidelity Low Duration Bond ETF 5.2   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.1   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.4   Apple Inc 1.3   Fidelity Blue Chip Growth ETF 1.2   NVIDIA Corp 1.1     37.5  
Fidelity Advisor Asset Manager 50% - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 50%
Class Name Fidelity Advisor Asset Manager® 50% Class M
Trading Symbol FFTMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 50% for the period October 1, 2024 to March 31, 2025.
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 
$ 52 
1.05%
  
Expenses Paid, Amount $ 52
Expense Ratio, Percent 1.05%
Net Assets $ 9,283,119,180
Holdings Count | shares 27
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$9,283,119,180
  
Number of Holdings
27
  
Portfolio Turnover
35%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 22.1 AAA 2.7 AA 0.1 A 2.4 BBB 6.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 1.8 Equities 55.6 Short-Term Investments and Net Other Assets (Liabilities) 6.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 22.1   AAA - 2.7                                  AA - 0.1                                   A - 2.4                                    BBB - 6.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.8                            Equities - 55.6                            Short-Term Investments and Net Other Assets (Liabilities) - 6.3   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 54.6 Bonds 39.1 Short-Term Investments and Net Other Assets (Liabilities) 6.3 ASSET ALLOCATION (% of Fund's net assets)     Equities - 54.6                            Bonds - 39.1                               Short-Term Investments and Net Other Assets (Liabilities) - 6.3  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 13.6   US Treasury Bonds 3.7   Fidelity Enhanced Small Cap ETF 2.2   Apple Inc 2.1   Fidelity Blue Chip Growth ETF 1.8   NVIDIA Corp 1.7   Microsoft Corp 1.6   Fannie Mae Mortgage pass-thru certificates 1.5   Freddie Mac Gold Pool 1.3   Ginnie Mae II Pool 1.3     30.8  
Fidelity Advisor Asset Manager 70% - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 70%
Class Name Fidelity Advisor Asset Manager® 70% Class C
Trading Symbol FCASX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 70% for the period October 1, 2024 to March 31, 2025.
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 
$ 80 
1.64%
  
Expenses Paid, Amount $ 80
Expense Ratio, Percent 1.64%
Net Assets $ 6,666,590,217
Holdings Count | shares 28
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$6,666,590,217
  
Number of Holdings
28
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.0 AAA 1.4 AA 0.1 A 1.7 BBB 3.4 BB 0.8 B 0.8 CCC,CC,C 0.2 D 0.0 Not Rated 1.1 Equities 73.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.0   AAA - 1.4                                  AA - 0.1                                   A - 1.7                                    BBB - 3.4                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 1.1                            Equities - 73.3                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.8   Information Technology 14.0   Industrials 8.5   Consumer Discretionary 7.0   Health Care 6.3   Communication Services 5.8   Consumer Staples 3.2   Energy 2.6   Materials 2.2   Real Estate 1.7   Utilities 1.6     Equities 72.2 Bonds 23.6 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 72.2                            Bonds - 23.6                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 8.4   Fidelity Enhanced Small Cap ETF 2.9   Apple Inc 2.6   Fidelity Blue Chip Growth ETF 2.4   NVIDIA Corp 2.2   Microsoft Corp 2.2   US Treasury Bonds 2.0   Amazon.com Inc 1.5   Fidelity Fundamental Small-Mid Cap ETF 1.2   Alphabet Inc Class A 1.2     26.6  
Fidelity Health Savings Fund - Class K  
Shareholder Report [Line Items]  
Fund Name Fidelity® Health Savings Fund
Class Name Fidelity® Health Savings Fund Class K
Trading Symbol FHLKX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Health Savings Fund for the period October 1, 2024 to March 31, 2025.
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 
$ 17 
0.34%
  
Expenses Paid, Amount $ 17
Expense Ratio, Percent 0.34%
Net Assets $ 60,869,038
Holdings Count | shares 15
Investment Company Portfolio Turnover 85.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$60,869,038
  
Number of Holdings
15
  
Portfolio Turnover
85%
  
Holdings [Text Block]         Common Stocks 32.2 Fixed-Income Funds 31.2 Bonds 21.1 Domestic Equity Funds 7.4 Preferred Stocks 0.0 Alternative Funds 0.0 Preferred Securities 0.0 Options 0.0 Short-Term Investments and Net Other Assets (Liabilities) 8.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 32.2                       Fixed-Income Funds - 31.2                  Bonds - 21.1                               Domestic Equity Funds - 7.4                Preferred Stocks - 0.0                     Alternative Funds - 0.0                    Preferred Securities - 0.0                 Options - 0.0                              Short-Term Investments and Net Other Assets (Liabilities) - 8.1  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity International Bond Index Fund 15.1   Fidelity Short-Term Bond Fund 10.0   US Treasury Notes 6.8   Fidelity Inflation-Protected Bond Index Fund 6.1   Fidelity Commodity Strategy Central Fund 3.7   US Treasury Bonds 2.1   Fidelity Enhanced Small Cap ETF 1.3   Apple Inc 1.2   Fidelity Blue Chip Growth ETF 1.1   NVIDIA Corp 1.0     48.4  
50% Allocation Fund  
Shareholder Report [Line Items]  
Fund Name 50% Allocation Fund
Class Name 50% Allocation Fund
Trading Symbol FRYBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about 50% Allocation Fund for the period October 1, 2024 to March 31, 2025.
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
 
50% Allocation Fund 
$ 0 A
0.00%B
  
A Amount represents less than $.50
B Amount represents less than 0.005%
 
Expenses Paid, Amount $ 0
Expense Ratio, Percent 0.00%
Net Assets $ 974,696
Holdings Count | shares 4
Investment Company Portfolio Turnover 15.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$974,696
  
Number of Holdings
4
  
Portfolio Turnover
15%
  
Holdings [Text Block]         Bond Funds 39.8 Domestic Equity Funds 35.3 International Equity Funds 15.0 Short-Term Funds 9.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Bond Funds - 39.8                          Domestic Equity Funds - 35.3               International Equity Funds - 15.0          Short-Term Funds - 9.9                     Short-Term Investments and Net Other Assets (Liabilities) - 0.0  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity U.S. Bond Index Fund 39.8   Fidelity Total Market Index Fund 35.3   Fidelity Total International Index Fund 15.0   Fidelity Short-Term Bond Index Fund 9.9     100.0  
Fidelity Advisor Asset Manager 60% - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 60%
Class Name Fidelity Advisor Asset Manager® 60% Class A
Trading Symbol FSAAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 60% for the period October 1, 2024 to March 31, 2025.
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 
$ 44 
0.90%
  
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.90%
Net Assets $ 4,203,564,524
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,203,564,524
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 19.2 AAA 2.4 AA 0.2 A 2.3 BBB 5.2 BB 1.1 B 0.9 CCC,CC,C 0.3 D 0.0 Not Rated 1.5 Equities 62.7 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 19.2   AAA - 2.4                                  AA - 0.2                                   A - 2.3                                    BBB - 5.2                                  BB - 1.1                                   B - 0.9                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.5                            Equities - 62.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.0   Information Technology 12.3   Industrials 7.4   Consumer Discretionary 6.2   Health Care 5.3   Communication Services 5.2   Energy 2.7   Consumer Staples 2.6   Materials 1.9   Real Estate 1.9   Utilities 1.5     Equities 61.6 Bonds 34.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 61.6                            Bonds - 34.2                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 11.9   US Treasury Bonds 3.2   Fidelity Enhanced Small Cap ETF 2.4   Apple Inc 2.3   Fidelity Blue Chip Growth ETF 2.0   NVIDIA Corp 1.9   Microsoft Corp 1.8   Fannie Mae Mortgage pass-thru certificates 1.3   Amazon.com Inc 1.3   Freddie Mac Gold Pool 1.1     29.2  
Fidelity Advisor Asset Manager 20% - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 20%
Class Name Fidelity Advisor Asset Manager® 20% Class Z
Trading Symbol FIKVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 20% for the period October 1, 2024 to March 31, 2025.
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 
$ 21 
0.42%
  
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.42%
Net Assets $ 5,417,378,496
Holdings Count | shares 31
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$5,417,378,496
  
Number of Holdings
31
  
Portfolio Turnover
41%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 27.9 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 31.7 Short-Term Investments and Net Other Assets (Liabilities) 20.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 27.9   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 31.7                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.1 Equities 25.8 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.1                               Equities - 25.8                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 16.9   Fidelity Low Duration Bond ETF 4.9   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.0   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.0   Fidelity Hedged Equity ETF 1.0   iShares 20+ Year Treasury Bond ETF 1.0   Apple Inc 1.0     36.0  
30% Allocation Fund  
Shareholder Report [Line Items]  
Fund Name 30% Allocation Fund
Class Name 30% Allocation Fund
Trading Symbol FMWIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about 30% Allocation Fund for the period October 1, 2024 to March 31, 2025.
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
 
30% Allocation Fund 
$ 0 A
0.00%B
  
A Amount represents less than $.50
B Amount represents less than 0.005%
 
Expenses Paid, Amount $ 0
Expense Ratio, Percent 0.00%
Net Assets $ 321,302
Holdings Count | shares 4
Investment Company Portfolio Turnover 9.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$321,302
  
Number of Holdings
4
  
Portfolio Turnover
9%
  
Holdings [Text Block]         Bond Funds 49.8 Domestic Equity Funds 21.2 Short-Term Funds 20.0 International Equity Funds 9.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Bond Funds - 49.8                          Domestic Equity Funds - 21.2               Short-Term Funds - 20.0                    International Equity Funds - 9.0           Short-Term Investments and Net Other Assets (Liabilities) - 0.0  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity U.S. Bond Index Fund 49.8   Fidelity Total Market Index Fund 21.2   Fidelity Short-Term Bond Index Fund 20.0   Fidelity Total International Index Fund 9.0     100.0  
Fidelity Advisor Sustainable Multi-Asset Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity® Sustainable Multi-Asset Fund
Class Name Fidelity Advisor® Sustainable Multi-Asset Fund Class M
Trading Symbol FYMMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Sustainable Multi-Asset Fund for the period October 1, 2024 to March 31, 2025.
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 
$ 27 
0.55%
  
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.55%
Net Assets $ 32,437,709
Holdings Count | shares 8
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$32,437,709
  
Number of Holdings
8
  
Portfolio Turnover
35%
  
Holdings [Text Block]         Domestic Equity Funds 40.3 International Equity Funds 35.5 Bond Funds 24.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 40.3               International Equity Funds - 35.5          Bond Funds - 24.2                          Short-Term Investments and Net Other Assets (Liabilities) - 0.0  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity U.S. Sustainability Index Fund 28.4   Fidelity Sustainable International Equity Fund 14.9   Fidelity International Sustainability Index Fund 13.9   Fidelity Sustainable Core Plus Bond Fund 13.3   Fidelity Sustainable U.S. Equity ETF 11.9   Fidelity Inflation-Protected Bond Index Fund 7.6   Fidelity Sustainable Emerging Markets Equity Fund 6.7   Fidelity Long-Term Treasury Bond Index Fund 3.3     100.0  
Fidelity Advisor Asset Manager 40% - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 40%
Class Name Fidelity Advisor Asset Manager® 40% Class M
Trading Symbol FFNTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 40% for the period October 1, 2024 to March 31, 2025.
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 
$ 49 
1.00%
  
Expenses Paid, Amount $ 49
Expense Ratio, Percent 1.00%
Net Assets $ 2,220,406,588
Holdings Count | shares 28
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,220,406,588
  
Number of Holdings
28
  
Portfolio Turnover
34%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 25.0 AAA 3.3 AA 0.3 A 2.5 BBB 7.6 BB 1.2 B 1.1 CCC,CC,C 0.2 D 0.0 Not Rated 2.0 Equities 46.0 Short-Term Investments and Net Other Assets (Liabilities) 10.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 25.0   AAA - 3.3                                  AA - 0.3                                   A - 2.5                                    BBB - 7.6                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 2.0                            Equities - 46.0                            Short-Term Investments and Net Other Assets (Liabilities) - 10.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 45.0 Bonds 44.2 Short-Term Investments and Net Other Assets (Liabilities) 10.8 ASSET ALLOCATION (% of Fund's net assets)     Equities - 45.0                            Bonds - 44.2                               Short-Term Investments and Net Other Assets (Liabilities) - 10.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 15.2   US Treasury Bonds 4.3   Fidelity Enhanced Small Cap ETF 1.9   Fannie Mae Mortgage pass-thru certificates 1.8   Apple Inc 1.7   Fidelity Blue Chip Growth ETF 1.5   Freddie Mac Gold Pool 1.5   Ginnie Mae II Pool 1.5   NVIDIA Corp 1.4   Microsoft Corp 1.3     32.1  
Fidelity Advisor Asset Manager 70% - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 70%
Class Name Fidelity Advisor Asset Manager® 70% Class Z
Trading Symbol FIQBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 70% for the period October 1, 2024 to March 31, 2025.
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 
$ 26 
0.52%
  
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.52%
Net Assets $ 6,666,590,217
Holdings Count | shares 28
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$6,666,590,217
  
Number of Holdings
28
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.0 AAA 1.4 AA 0.1 A 1.7 BBB 3.4 BB 0.8 B 0.8 CCC,CC,C 0.2 D 0.0 Not Rated 1.1 Equities 73.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.0   AAA - 1.4                                  AA - 0.1                                   A - 1.7                                    BBB - 3.4                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 1.1                            Equities - 73.3                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.8   Information Technology 14.0   Industrials 8.5   Consumer Discretionary 7.0   Health Care 6.3   Communication Services 5.8   Consumer Staples 3.2   Energy 2.6   Materials 2.2   Real Estate 1.7   Utilities 1.6     Equities 72.2 Bonds 23.6 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 72.2                            Bonds - 23.6                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 8.4   Fidelity Enhanced Small Cap ETF 2.9   Apple Inc 2.6   Fidelity Blue Chip Growth ETF 2.4   NVIDIA Corp 2.2   Microsoft Corp 2.2   US Treasury Bonds 2.0   Amazon.com Inc 1.5   Fidelity Fundamental Small-Mid Cap ETF 1.2   Alphabet Inc Class A 1.2     26.6  
Fidelity Health Savings Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Health Savings Fund
Class Name Fidelity® Health Savings Fund
Trading Symbol FHLSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Health Savings Fund for the period October 1, 2024 to March 31, 2025.
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® Health Savings Fund 
$ 22 
0.44%
  
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.44%
Net Assets $ 60,869,038
Holdings Count | shares 15
Investment Company Portfolio Turnover 85.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$60,869,038
  
Number of Holdings
15
  
Portfolio Turnover
85%
  
Holdings [Text Block]         Common Stocks 32.2 Fixed-Income Funds 31.2 Bonds 21.1 Domestic Equity Funds 7.4 Preferred Stocks 0.0 Alternative Funds 0.0 Preferred Securities 0.0 Options 0.0 Short-Term Investments and Net Other Assets (Liabilities) 8.1 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 32.2                       Fixed-Income Funds - 31.2                  Bonds - 21.1                               Domestic Equity Funds - 7.4                Preferred Stocks - 0.0                     Alternative Funds - 0.0                    Preferred Securities - 0.0                 Options - 0.0                              Short-Term Investments and Net Other Assets (Liabilities) - 8.1  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity International Bond Index Fund 15.1   Fidelity Short-Term Bond Fund 10.0   US Treasury Notes 6.8   Fidelity Inflation-Protected Bond Index Fund 6.1   Fidelity Commodity Strategy Central Fund 3.7   US Treasury Bonds 2.1   Fidelity Enhanced Small Cap ETF 1.3   Apple Inc 1.2   Fidelity Blue Chip Growth ETF 1.1   NVIDIA Corp 1.0     48.4  
Fidelity Asset Manager 40%  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 40%
Class Name Fidelity Asset Manager® 40%
Trading Symbol FFANX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 40% for the period October 1, 2024 to March 31, 2025.
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 Asset Manager® 40% 
$ 24 
0.48%
  
Expenses Paid, Amount $ 24
Expense Ratio, Percent 0.48%
Net Assets $ 2,220,406,588
Holdings Count | shares 28
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,220,406,588
  
Number of Holdings
28
  
Portfolio Turnover
34%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 25.0 AAA 3.3 AA 0.3 A 2.5 BBB 7.6 BB 1.2 B 1.1 CCC,CC,C 0.2 D 0.0 Not Rated 2.0 Equities 46.0 Short-Term Investments and Net Other Assets (Liabilities) 10.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 25.0   AAA - 3.3                                  AA - 0.3                                   A - 2.5                                    BBB - 7.6                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 2.0                            Equities - 46.0                            Short-Term Investments and Net Other Assets (Liabilities) - 10.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 45.0 Bonds 44.2 Short-Term Investments and Net Other Assets (Liabilities) 10.8 ASSET ALLOCATION (% of Fund's net assets)     Equities - 45.0                            Bonds - 44.2                               Short-Term Investments and Net Other Assets (Liabilities) - 10.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 15.2   US Treasury Bonds 4.3   Fidelity Enhanced Small Cap ETF 1.9   Fannie Mae Mortgage pass-thru certificates 1.8   Apple Inc 1.7   Fidelity Blue Chip Growth ETF 1.5   Freddie Mac Gold Pool 1.5   Ginnie Mae II Pool 1.5   NVIDIA Corp 1.4   Microsoft Corp 1.3     32.1  
Fidelity Advisor Asset Manager 70% - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 70%
Class Name Fidelity Advisor Asset Manager® 70% Class M
Trading Symbol FTASX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 70% for the period October 1, 2024 to March 31, 2025.
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 
$ 56 
1.14%
  
Expenses Paid, Amount $ 56
Expense Ratio, Percent 1.14%
Net Assets $ 6,666,590,217
Holdings Count | shares 28
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$6,666,590,217
  
Number of Holdings
28
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.0 AAA 1.4 AA 0.1 A 1.7 BBB 3.4 BB 0.8 B 0.8 CCC,CC,C 0.2 D 0.0 Not Rated 1.1 Equities 73.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.0   AAA - 1.4                                  AA - 0.1                                   A - 1.7                                    BBB - 3.4                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 1.1                            Equities - 73.3                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.8   Information Technology 14.0   Industrials 8.5   Consumer Discretionary 7.0   Health Care 6.3   Communication Services 5.8   Consumer Staples 3.2   Energy 2.6   Materials 2.2   Real Estate 1.7   Utilities 1.6     Equities 72.2 Bonds 23.6 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 72.2                            Bonds - 23.6                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 8.4   Fidelity Enhanced Small Cap ETF 2.9   Apple Inc 2.6   Fidelity Blue Chip Growth ETF 2.4   NVIDIA Corp 2.2   Microsoft Corp 2.2   US Treasury Bonds 2.0   Amazon.com Inc 1.5   Fidelity Fundamental Small-Mid Cap ETF 1.2   Alphabet Inc Class A 1.2     26.6  
Fidelity Advisor Asset Manager 70% - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 70%
Class Name Fidelity Advisor Asset Manager® 70% Class I
Trading Symbol FAAIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 70% for the period October 1, 2024 to March 31, 2025.
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 
$ 31 
0.64%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.64%
Net Assets $ 6,666,590,217
Holdings Count | shares 28
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$6,666,590,217
  
Number of Holdings
28
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.0 AAA 1.4 AA 0.1 A 1.7 BBB 3.4 BB 0.8 B 0.8 CCC,CC,C 0.2 D 0.0 Not Rated 1.1 Equities 73.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.0   AAA - 1.4                                  AA - 0.1                                   A - 1.7                                    BBB - 3.4                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 1.1                            Equities - 73.3                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.8   Information Technology 14.0   Industrials 8.5   Consumer Discretionary 7.0   Health Care 6.3   Communication Services 5.8   Consumer Staples 3.2   Energy 2.6   Materials 2.2   Real Estate 1.7   Utilities 1.6     Equities 72.2 Bonds 23.6 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 72.2                            Bonds - 23.6                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 8.4   Fidelity Enhanced Small Cap ETF 2.9   Apple Inc 2.6   Fidelity Blue Chip Growth ETF 2.4   NVIDIA Corp 2.2   Microsoft Corp 2.2   US Treasury Bonds 2.0   Amazon.com Inc 1.5   Fidelity Fundamental Small-Mid Cap ETF 1.2   Alphabet Inc Class A 1.2     26.6  
Fidelity Asset Manager 30%  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 30%
Class Name Fidelity Asset Manager® 30%
Trading Symbol FTANX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 30% for the period October 1, 2024 to March 31, 2025.
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 Asset Manager® 30% 
$ 23 
0.47%
  
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.47%
Net Assets $ 1,956,867,191
Holdings Count | shares 30
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,956,867,191
  
Number of Holdings
30
  
Portfolio Turnover
31%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 28.1 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 41.8 Short-Term Investments and Net Other Assets (Liabilities) 9.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 28.1   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 41.8                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.6 Equities 35.6 Short-Term Investments and Net Other Assets (Liabilities) 9.8 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.6                               Equities - 35.6                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 17.0   Fidelity Low Duration Bond ETF 5.2   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.1   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.4   Apple Inc 1.3   Fidelity Blue Chip Growth ETF 1.2   NVIDIA Corp 1.1     37.5  
Fidelity Advisor Asset Manager 40% - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 40%
Class Name Fidelity Advisor Asset Manager® 40% Class C
Trading Symbol FFNCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 40% for the period October 1, 2024 to March 31, 2025.
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 
$ 74 
1.50%
  
Expenses Paid, Amount $ 74
Expense Ratio, Percent 1.50%
Net Assets $ 2,220,406,588
Holdings Count | shares 28
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,220,406,588
  
Number of Holdings
28
  
Portfolio Turnover
34%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 25.0 AAA 3.3 AA 0.3 A 2.5 BBB 7.6 BB 1.2 B 1.1 CCC,CC,C 0.2 D 0.0 Not Rated 2.0 Equities 46.0 Short-Term Investments and Net Other Assets (Liabilities) 10.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 25.0   AAA - 3.3                                  AA - 0.3                                   A - 2.5                                    BBB - 7.6                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 2.0                            Equities - 46.0                            Short-Term Investments and Net Other Assets (Liabilities) - 10.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 45.0 Bonds 44.2 Short-Term Investments and Net Other Assets (Liabilities) 10.8 ASSET ALLOCATION (% of Fund's net assets)     Equities - 45.0                            Bonds - 44.2                               Short-Term Investments and Net Other Assets (Liabilities) - 10.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 15.2   US Treasury Bonds 4.3   Fidelity Enhanced Small Cap ETF 1.9   Fannie Mae Mortgage pass-thru certificates 1.8   Apple Inc 1.7   Fidelity Blue Chip Growth ETF 1.5   Freddie Mac Gold Pool 1.5   Ginnie Mae II Pool 1.5   NVIDIA Corp 1.4   Microsoft Corp 1.3     32.1  
Fidelity Health Savings Index Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Health Savings Index Fund
Class Name Fidelity® Health Savings Index Fund
Trading Symbol FHSNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Health Savings Index Fund for the period October 1, 2024 to March 31, 2025.
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® Health Savings Index Fund 
$ 5 
0.10%
  
Expenses Paid, Amount $ 5
Expense Ratio, Percent 0.10%
Net Assets $ 28,350,213
Holdings Count | shares 10
Investment Company Portfolio Turnover 74.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$28,350,213
  
Number of Holdings
10
  
Portfolio Turnover
74%
  
Holdings [Text Block]         Bonds 41.7 Equities 39.9 Short-Term Investments and Net Other Assets (Liabilities) 18.4 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 41.7                               Equities - 39.9                            Short-Term Investments and Net Other Assets (Liabilities) - 18.4  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity U.S. Bond Index Fund 19.2   Fidelity Total Market Index Fund 18.4   Fidelity International Bond Index Fund 15.0   Fidelity International Index Fund 12.3   Fidelity Short-Term Bond Index Fund 10.0   Fidelity Inflation-Protected Bond Index Fund 6.1   Fidelity Emerging Markets Index Fund 5.5   Fidelity Commodity Strategy Fund 3.7   iShares iBoxx $ High Yield Corporate Bond ETF 1.4     91.6  
Fidelity Advisor Asset Manager 20% - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 20%
Class Name Fidelity Advisor Asset Manager® 20% Class I
Trading Symbol FTIWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 20% for the period October 1, 2024 to March 31, 2025.
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 
$ 24 
0.48%
  
Expenses Paid, Amount $ 24
Expense Ratio, Percent 0.48%
Net Assets $ 5,417,378,496
Holdings Count | shares 31
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$5,417,378,496
  
Number of Holdings
31
  
Portfolio Turnover
41%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 27.9 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 31.7 Short-Term Investments and Net Other Assets (Liabilities) 20.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 27.9   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 31.7                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.1 Equities 25.8 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.1                               Equities - 25.8                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 16.9   Fidelity Low Duration Bond ETF 4.9   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.0   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.0   Fidelity Hedged Equity ETF 1.0   iShares 20+ Year Treasury Bond ETF 1.0   Apple Inc 1.0     36.0  
Fidelity Advisor Asset Manager 85% - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 85%
Class Name Fidelity Advisor Asset Manager® 85% Class Z
Trading Symbol FIQCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 85% for the period October 1, 2024 to March 31, 2025.
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 
$ 26 
0.53%
  
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.53%
Net Assets $ 4,470,422,828
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,470,422,828
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.7 AAA 0.5 AA 0.1 A 0.4 BBB 1.8 BB 0.6 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 0.8 Equities 85.6 Short-Term Investments and Net Other Assets (Liabilities) 2.4 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.7   AAA - 0.5                                  AA - 0.1                                   A - 0.4                                    BBB - 1.8                                  BB - 0.6                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 0.8                            Equities - 85.6                            Short-Term Investments and Net Other Assets (Liabilities) - 2.4   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 16.7   Information Technology 16.3   Industrials 9.7   Consumer Discretionary 8.0   Health Care 7.2   Communication Services 6.4   Consumer Staples 3.8   Materials 2.9   Energy 2.8   Real Estate 1.8   Utilities 1.6     Equities 84.5 Bonds 13.1 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 84.5                            Bonds - 13.1                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.3   Apple Inc 3.0   Fidelity Blue Chip Growth ETF 2.7   NVIDIA Corp 2.6   Microsoft Corp 2.5   Amazon.com Inc 1.7   Fidelity Fundamental Small-Mid Cap ETF 1.4   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Alphabet Inc Class A 1.3     24.7  
Fidelity Asset Manager 50%  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 50%
Class Name Fidelity Asset Manager® 50%
Trading Symbol FASMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 50% for the period October 1, 2024 to March 31, 2025.
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 Asset Manager® 50% 
$ 25 
0.51%
  
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.51%
Net Assets $ 9,283,119,180
Holdings Count | shares 27
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$9,283,119,180
  
Number of Holdings
27
  
Portfolio Turnover
35%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 22.1 AAA 2.7 AA 0.1 A 2.4 BBB 6.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 1.8 Equities 55.6 Short-Term Investments and Net Other Assets (Liabilities) 6.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 22.1   AAA - 2.7                                  AA - 0.1                                   A - 2.4                                    BBB - 6.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.8                            Equities - 55.6                            Short-Term Investments and Net Other Assets (Liabilities) - 6.3   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 54.6 Bonds 39.1 Short-Term Investments and Net Other Assets (Liabilities) 6.3 ASSET ALLOCATION (% of Fund's net assets)     Equities - 54.6                            Bonds - 39.1                               Short-Term Investments and Net Other Assets (Liabilities) - 6.3  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 13.6   US Treasury Bonds 3.7   Fidelity Enhanced Small Cap ETF 2.2   Apple Inc 2.1   Fidelity Blue Chip Growth ETF 1.8   NVIDIA Corp 1.7   Microsoft Corp 1.6   Fannie Mae Mortgage pass-thru certificates 1.5   Freddie Mac Gold Pool 1.3   Ginnie Mae II Pool 1.3     30.8  
Fidelity Asset Manager 20%  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 20%
Class Name Fidelity Asset Manager® 20%
Trading Symbol FASIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 20% for the period October 1, 2024 to March 31, 2025.
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 Asset Manager® 20% 
$ 23 
0.46%
  
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.46%
Net Assets $ 5,417,378,496
Holdings Count | shares 31
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$5,417,378,496
  
Number of Holdings
31
  
Portfolio Turnover
41%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 27.9 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 31.7 Short-Term Investments and Net Other Assets (Liabilities) 20.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 27.9   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 31.7                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.1 Equities 25.8 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.1                               Equities - 25.8                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 16.9   Fidelity Low Duration Bond ETF 4.9   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.0   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.0   Fidelity Hedged Equity ETF 1.0   iShares 20+ Year Treasury Bond ETF 1.0   Apple Inc 1.0     36.0  
Fidelity Advisor Asset Manager 70% - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 70%
Class Name Fidelity Advisor Asset Manager® 70% Class A
Trading Symbol FAASX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 70% for the period October 1, 2024 to March 31, 2025.
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 
$ 44 
0.89%
  
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.89%
Net Assets $ 6,666,590,217
Holdings Count | shares 28
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$6,666,590,217
  
Number of Holdings
28
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.0 AAA 1.4 AA 0.1 A 1.7 BBB 3.4 BB 0.8 B 0.8 CCC,CC,C 0.2 D 0.0 Not Rated 1.1 Equities 73.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.0   AAA - 1.4                                  AA - 0.1                                   A - 1.7                                    BBB - 3.4                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 1.1                            Equities - 73.3                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.8   Information Technology 14.0   Industrials 8.5   Consumer Discretionary 7.0   Health Care 6.3   Communication Services 5.8   Consumer Staples 3.2   Energy 2.6   Materials 2.2   Real Estate 1.7   Utilities 1.6     Equities 72.2 Bonds 23.6 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 72.2                            Bonds - 23.6                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 8.4   Fidelity Enhanced Small Cap ETF 2.9   Apple Inc 2.6   Fidelity Blue Chip Growth ETF 2.4   NVIDIA Corp 2.2   Microsoft Corp 2.2   US Treasury Bonds 2.0   Amazon.com Inc 1.5   Fidelity Fundamental Small-Mid Cap ETF 1.2   Alphabet Inc Class A 1.2     26.6  
Fidelity Advisor Asset Manager 20% - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 20%
Class Name Fidelity Advisor Asset Manager® 20% Class C
Trading Symbol FTCWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 20% for the period October 1, 2024 to March 31, 2025.
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 
$ 73 
1.48%
  
Expenses Paid, Amount $ 73
Expense Ratio, Percent 1.48%
Net Assets $ 5,417,378,496
Holdings Count | shares 31
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$5,417,378,496
  
Number of Holdings
31
  
Portfolio Turnover
41%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 27.9 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 31.7 Short-Term Investments and Net Other Assets (Liabilities) 20.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 27.9   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 31.7                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.1 Equities 25.8 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.1                               Equities - 25.8                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 16.9   Fidelity Low Duration Bond ETF 4.9   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.0   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.0   Fidelity Hedged Equity ETF 1.0   iShares 20+ Year Treasury Bond ETF 1.0   Apple Inc 1.0     36.0  
Fidelity Advisor Asset Manager 20% - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 20%
Class Name Fidelity Advisor Asset Manager® 20% Class M
Trading Symbol FTDWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 20% for the period October 1, 2024 to March 31, 2025.
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 
$ 49 
0.98%
  
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.98%
Net Assets $ 5,417,378,496
Holdings Count | shares 31
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$5,417,378,496
  
Number of Holdings
31
  
Portfolio Turnover
41%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 27.9 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 31.7 Short-Term Investments and Net Other Assets (Liabilities) 20.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 27.9   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 31.7                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.1 Equities 25.8 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.1                               Equities - 25.8                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 16.9   Fidelity Low Duration Bond ETF 4.9   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.0   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.0   Fidelity Hedged Equity ETF 1.0   iShares 20+ Year Treasury Bond ETF 1.0   Apple Inc 1.0     36.0  
Fidelity Advisor Asset Manager 50% - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 50%
Class Name Fidelity Advisor Asset Manager® 50% Class I
Trading Symbol FFIMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 50% for the period October 1, 2024 to March 31, 2025.
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 
$ 27 
0.55%
  
Expenses Paid, Amount $ 27
Expense Ratio, Percent 0.55%
Net Assets $ 9,283,119,180
Holdings Count | shares 27
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$9,283,119,180
  
Number of Holdings
27
  
Portfolio Turnover
35%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 22.1 AAA 2.7 AA 0.1 A 2.4 BBB 6.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 1.8 Equities 55.6 Short-Term Investments and Net Other Assets (Liabilities) 6.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 22.1   AAA - 2.7                                  AA - 0.1                                   A - 2.4                                    BBB - 6.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.8                            Equities - 55.6                            Short-Term Investments and Net Other Assets (Liabilities) - 6.3   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 54.6 Bonds 39.1 Short-Term Investments and Net Other Assets (Liabilities) 6.3 ASSET ALLOCATION (% of Fund's net assets)     Equities - 54.6                            Bonds - 39.1                               Short-Term Investments and Net Other Assets (Liabilities) - 6.3  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 13.6   US Treasury Bonds 3.7   Fidelity Enhanced Small Cap ETF 2.2   Apple Inc 2.1   Fidelity Blue Chip Growth ETF 1.8   NVIDIA Corp 1.7   Microsoft Corp 1.6   Fannie Mae Mortgage pass-thru certificates 1.5   Freddie Mac Gold Pool 1.3   Ginnie Mae II Pool 1.3     30.8  
Fidelity Advisor Asset Manager 85% - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 85%
Class Name Fidelity Advisor Asset Manager® 85% Class C
Trading Symbol FEYCX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 85% for the period October 1, 2024 to March 31, 2025.
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 
$ 80 
1.64%
  
Expenses Paid, Amount $ 80
Expense Ratio, Percent 1.64%
Net Assets $ 4,470,422,828
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,470,422,828
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.7 AAA 0.5 AA 0.1 A 0.4 BBB 1.8 BB 0.6 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 0.8 Equities 85.6 Short-Term Investments and Net Other Assets (Liabilities) 2.4 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.7   AAA - 0.5                                  AA - 0.1                                   A - 0.4                                    BBB - 1.8                                  BB - 0.6                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 0.8                            Equities - 85.6                            Short-Term Investments and Net Other Assets (Liabilities) - 2.4   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 16.7   Information Technology 16.3   Industrials 9.7   Consumer Discretionary 8.0   Health Care 7.2   Communication Services 6.4   Consumer Staples 3.8   Materials 2.9   Energy 2.8   Real Estate 1.8   Utilities 1.6     Equities 84.5 Bonds 13.1 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 84.5                            Bonds - 13.1                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.3   Apple Inc 3.0   Fidelity Blue Chip Growth ETF 2.7   NVIDIA Corp 2.6   Microsoft Corp 2.5   Amazon.com Inc 1.7   Fidelity Fundamental Small-Mid Cap ETF 1.4   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Alphabet Inc Class A 1.3     24.7  
Fidelity Asset Manager 85%  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 85%
Class Name Fidelity Asset Manager® 85%
Trading Symbol FAMRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 85% for the period October 1, 2024 to March 31, 2025.
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 Asset Manager® 85% 
$ 29 
0.60%
  
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.60%
Net Assets $ 4,470,422,828
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,470,422,828
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.7 AAA 0.5 AA 0.1 A 0.4 BBB 1.8 BB 0.6 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 0.8 Equities 85.6 Short-Term Investments and Net Other Assets (Liabilities) 2.4 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.7   AAA - 0.5                                  AA - 0.1                                   A - 0.4                                    BBB - 1.8                                  BB - 0.6                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 0.8                            Equities - 85.6                            Short-Term Investments and Net Other Assets (Liabilities) - 2.4   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 16.7   Information Technology 16.3   Industrials 9.7   Consumer Discretionary 8.0   Health Care 7.2   Communication Services 6.4   Consumer Staples 3.8   Materials 2.9   Energy 2.8   Real Estate 1.8   Utilities 1.6     Equities 84.5 Bonds 13.1 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 84.5                            Bonds - 13.1                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.3   Apple Inc 3.0   Fidelity Blue Chip Growth ETF 2.7   NVIDIA Corp 2.6   Microsoft Corp 2.5   Amazon.com Inc 1.7   Fidelity Fundamental Small-Mid Cap ETF 1.4   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Alphabet Inc Class A 1.3     24.7  
Fidelity Advisor Asset Manager 30% - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 30%
Class Name Fidelity Advisor Asset Manager® 30% Class I
Trading Symbol FTINX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 30% for the period October 1, 2024 to March 31, 2025.
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 
$ 25 
0.50%
  
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.50%
Net Assets $ 1,956,867,191
Holdings Count | shares 30
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,956,867,191
  
Number of Holdings
30
  
Portfolio Turnover
31%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 28.1 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 41.8 Short-Term Investments and Net Other Assets (Liabilities) 9.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 28.1   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 41.8                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.6 Equities 35.6 Short-Term Investments and Net Other Assets (Liabilities) 9.8 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.6                               Equities - 35.6                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 17.0   Fidelity Low Duration Bond ETF 5.2   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.1   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.4   Apple Inc 1.3   Fidelity Blue Chip Growth ETF 1.2   NVIDIA Corp 1.1     37.5  
Fidelity Advisor Asset Manager 30% - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 30%
Class Name Fidelity Advisor Asset Manager® 30% Class C
Trading Symbol FCANX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 30% for the period October 1, 2024 to March 31, 2025.
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 
$ 74 
1.49%
  
Expenses Paid, Amount $ 74
Expense Ratio, Percent 1.49%
Net Assets $ 1,956,867,191
Holdings Count | shares 30
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,956,867,191
  
Number of Holdings
30
  
Portfolio Turnover
31%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 28.1 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 41.8 Short-Term Investments and Net Other Assets (Liabilities) 9.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 28.1   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 41.8                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.6 Equities 35.6 Short-Term Investments and Net Other Assets (Liabilities) 9.8 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.6                               Equities - 35.6                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 17.0   Fidelity Low Duration Bond ETF 5.2   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.1   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.4   Apple Inc 1.3   Fidelity Blue Chip Growth ETF 1.2   NVIDIA Corp 1.1     37.5  
70% Allocation Fund  
Shareholder Report [Line Items]  
Fund Name 70% Allocation Fund
Class Name 70% Allocation Fund
Trading Symbol FRGAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about 70% Allocation Fund for the period October 1, 2024 to March 31, 2025.
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
 
70% Allocation Fund 
$ 0 A
0.00%B
  
A Amount represents less than $.50
B Amount represents less than 0.005%
 
Expenses Paid, Amount $ 0
Expense Ratio, Percent 0.00%
Net Assets $ 1,140,392
Holdings Count | shares 4
Investment Company Portfolio Turnover 23.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,140,392
  
Number of Holdings
4
  
Portfolio Turnover
23%
  
Holdings [Text Block]         Domestic Equity Funds 49.3 Bond Funds 24.8 International Equity Funds 20.9 Short-Term Funds 5.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 49.3               Bond Funds - 24.8                          International Equity Funds - 20.9          Short-Term Funds - 5.0                     Short-Term Investments and Net Other Assets (Liabilities) - 0.0  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity Total Market Index Fund 49.3   Fidelity U.S. Bond Index Fund 24.8   Fidelity Total International Index Fund 20.9   Fidelity Short-Term Bond Index Fund 5.0     100.0  
85% Allocation Fund  
Shareholder Report [Line Items]  
Fund Name 85% Allocation Fund
Class Name 85% Allocation Fund
Trading Symbol FRAGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about 85% Allocation Fund for the period October 1, 2024 to March 31, 2025.
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
 
85% Allocation Fund 
$ 0 A
0.00%B
  
A Amount represents less than $.50
B Amount represents less than 0.005%
 
Expenses Paid, Amount $ 0
Expense Ratio, Percent 0.00%
Net Assets $ 1,537,458
Holdings Count | shares 3
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,537,458
  
Number of Holdings
3
  
Portfolio Turnover
14%
  
Holdings [Text Block]         Domestic Equity Funds 60.2 International Equity Funds 24.9 Bond Funds 14.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 60.2               International Equity Funds - 24.9          Bond Funds - 14.9                          Short-Term Investments and Net Other Assets (Liabilities) - 0.0  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity Total Market Index Fund 60.2   Fidelity Total International Index Fund 24.9   Fidelity U.S. Bond Index Fund 14.9     100.0  
Fidelity Advisor Asset Manager 50% - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 50%
Class Name Fidelity Advisor Asset Manager® 50% Class C
Trading Symbol FFCMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 50% for the period October 1, 2024 to March 31, 2025.
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 
$ 76 
1.55%
  
Expenses Paid, Amount $ 76
Expense Ratio, Percent 1.55%
Net Assets $ 9,283,119,180
Holdings Count | shares 27
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$9,283,119,180
  
Number of Holdings
27
  
Portfolio Turnover
35%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 22.1 AAA 2.7 AA 0.1 A 2.4 BBB 6.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 1.8 Equities 55.6 Short-Term Investments and Net Other Assets (Liabilities) 6.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 22.1   AAA - 2.7                                  AA - 0.1                                   A - 2.4                                    BBB - 6.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.8                            Equities - 55.6                            Short-Term Investments and Net Other Assets (Liabilities) - 6.3   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 54.6 Bonds 39.1 Short-Term Investments and Net Other Assets (Liabilities) 6.3 ASSET ALLOCATION (% of Fund's net assets)     Equities - 54.6                            Bonds - 39.1                               Short-Term Investments and Net Other Assets (Liabilities) - 6.3  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 13.6   US Treasury Bonds 3.7   Fidelity Enhanced Small Cap ETF 2.2   Apple Inc 2.1   Fidelity Blue Chip Growth ETF 1.8   NVIDIA Corp 1.7   Microsoft Corp 1.6   Fannie Mae Mortgage pass-thru certificates 1.5   Freddie Mac Gold Pool 1.3   Ginnie Mae II Pool 1.3     30.8  
Fidelity Asset Manager 70%  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 70%
Class Name Fidelity Asset Manager® 70%
Trading Symbol FASGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 70% for the period October 1, 2024 to March 31, 2025.
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 Asset Manager® 70% 
$ 29 
0.59%
  
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.59%
Net Assets $ 6,666,590,217
Holdings Count | shares 28
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$6,666,590,217
  
Number of Holdings
28
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.0 AAA 1.4 AA 0.1 A 1.7 BBB 3.4 BB 0.8 B 0.8 CCC,CC,C 0.2 D 0.0 Not Rated 1.1 Equities 73.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.0   AAA - 1.4                                  AA - 0.1                                   A - 1.7                                    BBB - 3.4                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 1.1                            Equities - 73.3                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.8   Information Technology 14.0   Industrials 8.5   Consumer Discretionary 7.0   Health Care 6.3   Communication Services 5.8   Consumer Staples 3.2   Energy 2.6   Materials 2.2   Real Estate 1.7   Utilities 1.6     Equities 72.2 Bonds 23.6 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 72.2                            Bonds - 23.6                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 8.4   Fidelity Enhanced Small Cap ETF 2.9   Apple Inc 2.6   Fidelity Blue Chip Growth ETF 2.4   NVIDIA Corp 2.2   Microsoft Corp 2.2   US Treasury Bonds 2.0   Amazon.com Inc 1.5   Fidelity Fundamental Small-Mid Cap ETF 1.2   Alphabet Inc Class A 1.2     26.6  
Fidelity Advisor Asset Manager 30% - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 30%
Class Name Fidelity Advisor Asset Manager® 30% Class M
Trading Symbol FTTNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 30% for the period October 1, 2024 to March 31, 2025.
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 
$ 49 
0.99%
  
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.99%
Net Assets $ 1,956,867,191
Holdings Count | shares 30
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,956,867,191
  
Number of Holdings
30
  
Portfolio Turnover
31%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 28.1 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 41.8 Short-Term Investments and Net Other Assets (Liabilities) 9.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 28.1   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 41.8                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.6 Equities 35.6 Short-Term Investments and Net Other Assets (Liabilities) 9.8 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.6                               Equities - 35.6                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 17.0   Fidelity Low Duration Bond ETF 5.2   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.1   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.4   Apple Inc 1.3   Fidelity Blue Chip Growth ETF 1.2   NVIDIA Corp 1.1     37.5  
Fidelity Advisor Asset Manager 50% - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 50%
Class Name Fidelity Advisor Asset Manager® 50% Class A
Trading Symbol FFAMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 50% for the period October 1, 2024 to March 31, 2025.
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 
$ 39 
0.80%
  
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.80%
Net Assets $ 9,283,119,180
Holdings Count | shares 27
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$9,283,119,180
  
Number of Holdings
27
  
Portfolio Turnover
35%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 22.1 AAA 2.7 AA 0.1 A 2.4 BBB 6.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 1.8 Equities 55.6 Short-Term Investments and Net Other Assets (Liabilities) 6.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 22.1   AAA - 2.7                                  AA - 0.1                                   A - 2.4                                    BBB - 6.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.8                            Equities - 55.6                            Short-Term Investments and Net Other Assets (Liabilities) - 6.3   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 54.6 Bonds 39.1 Short-Term Investments and Net Other Assets (Liabilities) 6.3 ASSET ALLOCATION (% of Fund's net assets)     Equities - 54.6                            Bonds - 39.1                               Short-Term Investments and Net Other Assets (Liabilities) - 6.3  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 13.6   US Treasury Bonds 3.7   Fidelity Enhanced Small Cap ETF 2.2   Apple Inc 2.1   Fidelity Blue Chip Growth ETF 1.8   NVIDIA Corp 1.7   Microsoft Corp 1.6   Fannie Mae Mortgage pass-thru certificates 1.5   Freddie Mac Gold Pool 1.3   Ginnie Mae II Pool 1.3     30.8  
Fidelity Advisor Asset Manager 60% - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 60%
Class Name Fidelity Advisor Asset Manager® 60% Class I
Trading Symbol FSNIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 60% for the period October 1, 2024 to March 31, 2025.
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 
$ 32 
0.65%
  
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.65%
Net Assets $ 4,203,564,524
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,203,564,524
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 19.2 AAA 2.4 AA 0.2 A 2.3 BBB 5.2 BB 1.1 B 0.9 CCC,CC,C 0.3 D 0.0 Not Rated 1.5 Equities 62.7 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 19.2   AAA - 2.4                                  AA - 0.2                                   A - 2.3                                    BBB - 5.2                                  BB - 1.1                                   B - 0.9                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.5                            Equities - 62.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.0   Information Technology 12.3   Industrials 7.4   Consumer Discretionary 6.2   Health Care 5.3   Communication Services 5.2   Energy 2.7   Consumer Staples 2.6   Materials 1.9   Real Estate 1.9   Utilities 1.5     Equities 61.6 Bonds 34.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 61.6                            Bonds - 34.2                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 11.9   US Treasury Bonds 3.2   Fidelity Enhanced Small Cap ETF 2.4   Apple Inc 2.3   Fidelity Blue Chip Growth ETF 2.0   NVIDIA Corp 1.9   Microsoft Corp 1.8   Fannie Mae Mortgage pass-thru certificates 1.3   Amazon.com Inc 1.3   Freddie Mac Gold Pool 1.1     29.2  
Fidelity Advisor Asset Manager 60% - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 60%
Class Name Fidelity Advisor Asset Manager® 60% Class C
Trading Symbol FSCNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 60% for the period October 1, 2024 to March 31, 2025.
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 
$ 81 
1.65%
  
Expenses Paid, Amount $ 81
Expense Ratio, Percent 1.65%
Net Assets $ 4,203,564,524
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,203,564,524
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 19.2 AAA 2.4 AA 0.2 A 2.3 BBB 5.2 BB 1.1 B 0.9 CCC,CC,C 0.3 D 0.0 Not Rated 1.5 Equities 62.7 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 19.2   AAA - 2.4                                  AA - 0.2                                   A - 2.3                                    BBB - 5.2                                  BB - 1.1                                   B - 0.9                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.5                            Equities - 62.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.0   Information Technology 12.3   Industrials 7.4   Consumer Discretionary 6.2   Health Care 5.3   Communication Services 5.2   Energy 2.7   Consumer Staples 2.6   Materials 1.9   Real Estate 1.9   Utilities 1.5     Equities 61.6 Bonds 34.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 61.6                            Bonds - 34.2                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 11.9   US Treasury Bonds 3.2   Fidelity Enhanced Small Cap ETF 2.4   Apple Inc 2.3   Fidelity Blue Chip Growth ETF 2.0   NVIDIA Corp 1.9   Microsoft Corp 1.8   Fannie Mae Mortgage pass-thru certificates 1.3   Amazon.com Inc 1.3   Freddie Mac Gold Pool 1.1     29.2  
Fidelity Asset Manager 60%  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 60%
Class Name Fidelity Asset Manager® 60%
Trading Symbol FSANX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 60% for the period October 1, 2024 to March 31, 2025.
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 Asset Manager® 60% 
$ 30 
0.60%
  
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.60%
Net Assets $ 4,203,564,524
Holdings Count | shares 27
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$4,203,564,524
  
Number of Holdings
27
  
Portfolio Turnover
42%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 19.2 AAA 2.4 AA 0.2 A 2.3 BBB 5.2 BB 1.1 B 0.9 CCC,CC,C 0.3 D 0.0 Not Rated 1.5 Equities 62.7 Short-Term Investments and Net Other Assets (Liabilities) 4.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 19.2   AAA - 2.4                                  AA - 0.2                                   A - 2.3                                    BBB - 5.2                                  BB - 1.1                                   B - 0.9                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.5                            Equities - 62.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.2   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.       MARKET SECTORS (% of Fund's net assets)     Financials 15.0   Information Technology 12.3   Industrials 7.4   Consumer Discretionary 6.2   Health Care 5.3   Communication Services 5.2   Energy 2.7   Consumer Staples 2.6   Materials 1.9   Real Estate 1.9   Utilities 1.5     Equities 61.6 Bonds 34.2 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 61.6                            Bonds - 34.2                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 11.9   US Treasury Bonds 3.2   Fidelity Enhanced Small Cap ETF 2.4   Apple Inc 2.3   Fidelity Blue Chip Growth ETF 2.0   NVIDIA Corp 1.9   Microsoft Corp 1.8   Fannie Mae Mortgage pass-thru certificates 1.3   Amazon.com Inc 1.3   Freddie Mac Gold Pool 1.1     29.2  
Fidelity Advisor Sustainable Multi-Asset Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity® Sustainable Multi-Asset Fund
Class Name Fidelity Advisor® Sustainable Multi-Asset Fund Class I
Trading Symbol FYMIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Sustainable Multi-Asset Fund for the period October 1, 2024 to March 31, 2025.
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 
$ 2 
0.05%
  
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.05%
Net Assets $ 32,437,709
Holdings Count | shares 8
Investment Company Portfolio Turnover 35.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$32,437,709
  
Number of Holdings
8
  
Portfolio Turnover
35%
  
Holdings [Text Block]         Domestic Equity Funds 40.3 International Equity Funds 35.5 Bond Funds 24.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 40.3               International Equity Funds - 35.5          Bond Funds - 24.2                          Short-Term Investments and Net Other Assets (Liabilities) - 0.0  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Fidelity U.S. Sustainability Index Fund 28.4   Fidelity Sustainable International Equity Fund 14.9   Fidelity International Sustainability Index Fund 13.9   Fidelity Sustainable Core Plus Bond Fund 13.3   Fidelity Sustainable U.S. Equity ETF 11.9   Fidelity Inflation-Protected Bond Index Fund 7.6   Fidelity Sustainable Emerging Markets Equity Fund 6.7   Fidelity Long-Term Treasury Bond Index Fund 3.3     100.0  
Fidelity Advisor Asset Manager 30% - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 30%
Class Name Fidelity Advisor Asset Manager® 30% Class Z
Trading Symbol FIKWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 30% for the period October 1, 2024 to March 31, 2025.
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 
$ 22 
0.44%
  
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.44%
Net Assets $ 1,956,867,191
Holdings Count | shares 30
Investment Company Portfolio Turnover 31.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$1,956,867,191
  
Number of Holdings
30
  
Portfolio Turnover
31%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 28.1 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 41.8 Short-Term Investments and Net Other Assets (Liabilities) 9.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 28.1   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 41.8                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.6 Equities 35.6 Short-Term Investments and Net Other Assets (Liabilities) 9.8 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.6                               Equities - 35.6                            Short-Term Investments and Net Other Assets (Liabilities) - 9.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 17.0   Fidelity Low Duration Bond ETF 5.2   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.1   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.4   Apple Inc 1.3   Fidelity Blue Chip Growth ETF 1.2   NVIDIA Corp 1.1     37.5  
Fidelity Advisor Asset Manager 40% - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 40%
Class Name Fidelity Advisor Asset Manager® 40% Class A
Trading Symbol FFNAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 40% for the period October 1, 2024 to March 31, 2025.
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 
$ 37 
0.75%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.75%
Net Assets $ 2,220,406,588
Holdings Count | shares 28
Investment Company Portfolio Turnover 34.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,220,406,588
  
Number of Holdings
28
  
Portfolio Turnover
34%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 25.0 AAA 3.3 AA 0.3 A 2.5 BBB 7.6 BB 1.2 B 1.1 CCC,CC,C 0.2 D 0.0 Not Rated 2.0 Equities 46.0 Short-Term Investments and Net Other Assets (Liabilities) 10.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 25.0   AAA - 3.3                                  AA - 0.3                                   A - 2.5                                    BBB - 7.6                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.2                             D - 0.0                                    Not Rated - 2.0                            Equities - 46.0                            Short-Term Investments and Net Other Assets (Liabilities) - 10.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Equities 45.0 Bonds 44.2 Short-Term Investments and Net Other Assets (Liabilities) 10.8 ASSET ALLOCATION (% of Fund's net assets)     Equities - 45.0                            Bonds - 44.2                               Short-Term Investments and Net Other Assets (Liabilities) - 10.8  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 15.2   US Treasury Bonds 4.3   Fidelity Enhanced Small Cap ETF 1.9   Fannie Mae Mortgage pass-thru certificates 1.8   Apple Inc 1.7   Fidelity Blue Chip Growth ETF 1.5   Freddie Mac Gold Pool 1.5   Ginnie Mae II Pool 1.5   NVIDIA Corp 1.4   Microsoft Corp 1.3     32.1  
Fidelity Advisor Asset Manager 20% - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Asset Manager® 20%
Class Name Fidelity Advisor Asset Manager® 20% Class A
Trading Symbol FTAWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Asset Manager® 20% for the period October 1, 2024 to March 31, 2025.
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 
$ 36 
0.73%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.73%
Net Assets $ 5,417,378,496
Holdings Count | shares 31
Investment Company Portfolio Turnover 41.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2025)
 
KEY FACTS 
  
  
Fund Size
$5,417,378,496
  
Number of Holdings
31
  
Portfolio Turnover
41%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 27.9 AAA 3.8 AA 0.4 A 3.0 BBB 8.4 BB 1.2 B 1.1 CCC,CC,C 0.3 D 0.0 Not Rated 2.1 Equities 31.7 Short-Term Investments and Net Other Assets (Liabilities) 20.1 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 27.9   AAA - 3.8                                  AA - 0.4                                   A - 3.0                                    BBB - 8.4                                  BB - 1.2                                   B - 1.1                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.1                            Equities - 31.7                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Bonds 54.1 Equities 25.8 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 54.1                               Equities - 25.8                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 16.9   Fidelity Low Duration Bond ETF 4.9   US Treasury Bonds 4.8   Fannie Mae Mortgage pass-thru certificates 2.0   Freddie Mac Gold Pool 1.7   Ginnie Mae II Pool 1.7   Fidelity Enhanced Small Cap ETF 1.0   Fidelity Hedged Equity ETF 1.0   iShares 20+ Year Treasury Bond ETF 1.0   Apple Inc 1.0     36.0