XML 111 R2.htm IDEA: XBRL DOCUMENT v3.26.1
Shareholder Report
 6 Months Ended
Mar. 31, 2026
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, 2026
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, 2025 to March 31, 2026.
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 $ 397,371
Holdings Count | shares 4
Investment Company Portfolio Turnover 14.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$397,371
  
Number of Holdings
4
  
Portfolio Turnover
14%
  
Holdings [Text Block]         Bond Funds 49.9 Domestic Equity Funds 21.1 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 - 49.9                          Domestic Equity Funds - 21.1               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 49.9   Fidelity Total Market Index Fund 21.1   Fidelity Short-Term Bond Index Fund 20.0   Fidelity Total International Index Fund 9.0     100.0  
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, 2025 to March 31, 2026.
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 $ 1,569,231
Holdings Count | shares 4
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,569,231
  
Number of Holdings
4
  
Portfolio Turnover
11%
  
Holdings [Text Block]         Domestic Equity Funds 49.1 Bond Funds 24.8 International Equity Funds 21.1 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 - 49.1               Bond Funds - 24.8                          International Equity Funds - 21.1          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 49.1   Fidelity U.S. Bond Index Fund 24.8   Fidelity Total International Index Fund 21.1   Fidelity Short-Term Bond Index Fund 5.0     100.0  
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, 2025 to March 31, 2026.
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 
$ 3 
0.05%
  
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05%
Net Assets $ 81,186,427
Holdings Count | shares 8
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$81,186,427
  
Number of Holdings
8
  
Portfolio Turnover
42%
  
Holdings [Text Block]         Domestic Equity Funds 40.6 International Equity Funds 34.8 Bond Funds 24.4 Short-Term Funds 0.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 40.6               International Equity Funds - 34.8          Bond Funds - 24.4                          Short-Term Funds - 0.2                     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 40.6   Fidelity Sustainable International Equity Fund 14.3   Fidelity Sustainable Core Plus Bond Fund 13.7   Fidelity International Sustainability Index Fund 13.3   Fidelity Sustainable Emerging Markets Equity Fund 7.2   Fidelity Inflation-Protected Bond Index Fund 6.4   Fidelity Long-Term Treasury Bond Index Fund 4.3   Fidelity Sustainable Low Duration Bond Fund 0.2     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, 2025 to March 31, 2026.
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 
$ 28 
0.55%
  
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.55%
Net Assets $ 81,186,427
Holdings Count | shares 8
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$81,186,427
  
Number of Holdings
8
  
Portfolio Turnover
42%
  
Holdings [Text Block]         Domestic Equity Funds 40.6 International Equity Funds 34.8 Bond Funds 24.4 Short-Term Funds 0.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 40.6               International Equity Funds - 34.8          Bond Funds - 24.4                          Short-Term Funds - 0.2                     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 40.6   Fidelity Sustainable International Equity Fund 14.3   Fidelity Sustainable Core Plus Bond Fund 13.7   Fidelity International Sustainability Index Fund 13.3   Fidelity Sustainable Emerging Markets Equity Fund 7.2   Fidelity Inflation-Protected Bond Index Fund 6.4   Fidelity Long-Term Treasury Bond Index Fund 4.3   Fidelity Sustainable Low Duration Bond Fund 0.2     100.0  
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, 2025 to March 31, 2026.
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 
$ 3 
0.05%
  
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05%
Net Assets $ 81,186,427
Holdings Count | shares 8
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$81,186,427
  
Number of Holdings
8
  
Portfolio Turnover
42%
  
Holdings [Text Block]         Domestic Equity Funds 40.6 International Equity Funds 34.8 Bond Funds 24.4 Short-Term Funds 0.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 40.6               International Equity Funds - 34.8          Bond Funds - 24.4                          Short-Term Funds - 0.2                     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 40.6   Fidelity Sustainable International Equity Fund 14.3   Fidelity Sustainable Core Plus Bond Fund 13.7   Fidelity International Sustainability Index Fund 13.3   Fidelity Sustainable Emerging Markets Equity Fund 7.2   Fidelity Inflation-Protected Bond Index Fund 6.4   Fidelity Long-Term Treasury Bond Index Fund 4.3   Fidelity Sustainable Low Duration Bond Fund 0.2     100.0  
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, 2025 to March 31, 2026.
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 
$ 52 
1.05%
  
Expenses Paid, Amount $ 52
Expense Ratio, Percent 1.05%
Net Assets $ 81,186,427
Holdings Count | shares 8
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$81,186,427
  
Number of Holdings
8
  
Portfolio Turnover
42%
  
Holdings [Text Block]         Domestic Equity Funds 40.6 International Equity Funds 34.8 Bond Funds 24.4 Short-Term Funds 0.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 40.6               International Equity Funds - 34.8          Bond Funds - 24.4                          Short-Term Funds - 0.2                     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 40.6   Fidelity Sustainable International Equity Fund 14.3   Fidelity Sustainable Core Plus Bond Fund 13.7   Fidelity International Sustainability Index Fund 13.3   Fidelity Sustainable Emerging Markets Equity Fund 7.2   Fidelity Inflation-Protected Bond Index Fund 6.4   Fidelity Long-Term Treasury Bond Index Fund 4.3   Fidelity Sustainable Low Duration Bond Fund 0.2     100.0  
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, 2025 to March 31, 2026.
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 $ 81,186,427
Holdings Count | shares 8
Investment Company Portfolio Turnover 42.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$81,186,427
  
Number of Holdings
8
  
Portfolio Turnover
42%
  
Holdings [Text Block]         Domestic Equity Funds 40.6 International Equity Funds 34.8 Bond Funds 24.4 Short-Term Funds 0.2 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 40.6               International Equity Funds - 34.8          Bond Funds - 24.4                          Short-Term Funds - 0.2                     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 40.6   Fidelity Sustainable International Equity Fund 14.3   Fidelity Sustainable Core Plus Bond Fund 13.7   Fidelity International Sustainability Index Fund 13.3   Fidelity Sustainable Emerging Markets Equity Fund 7.2   Fidelity Inflation-Protected Bond Index Fund 6.4   Fidelity Long-Term Treasury Bond Index Fund 4.3   Fidelity Sustainable Low Duration Bond Fund 0.2     100.0  
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, 2025 to March 31, 2026.
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 $ 32,754,925
Holdings Count | shares 10
Investment Company Portfolio Turnover 32.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$32,754,925
  
Number of Holdings
10
  
Portfolio Turnover
32%
  
Holdings [Text Block]         Bonds 52.6 Equities 40.6 Short-Term Investments and Net Other Assets (Liabilities) 6.8 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 52.6                               Equities - 40.6                            Short-Term Investments and Net Other Assets (Liabilities) - 6.8  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Fidelity U.S. Bond Index Fund 20.6   Fidelity Total Market Index Fund 17.3   Fidelity International Bond Index Fund 14.9   Fidelity International Index Fund 11.1   Fidelity Short-Term Bond Index Fund 9.9   Fidelity Emerging Markets Index Fund 7.7   Fidelity Commodity Strategy Central Fund 4.5   Fidelity Inflation-Protected Bond Index Fund 4.4   iShares iBoxx $ High Yield Corporate Bond ETF 2.8     93.2  
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, 2025 to March 31, 2026.
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 $ 68,821,351
Holdings Count | shares 15
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$68,821,351
  
Number of Holdings
15
  
Portfolio Turnover
24%
  
Holdings [Text Block]         Common Stocks 32.2 Fixed-Income Funds 29.2 Bonds 23.4 Domestic Equity Funds 7.9 Preferred Stocks 0.1 Alternative Funds 0.1 Preferred Securities 0.1 Options 0.0 Short-Term Investments and Net Other Assets (Liabilities) 7.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 32.2                       Fixed-Income Funds - 29.2                  Bonds - 23.4                               Domestic Equity Funds - 7.9                Preferred Stocks - 0.1                     Alternative Funds - 0.1                    Preferred Securities - 0.1                 Options - 0.0                              Short-Term Investments and Net Other Assets (Liabilities) - 7.0  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Fidelity International Bond Index Fund 14.9   Fidelity Short-Term Bond Fund 9.9   US Treasury Notes 8.0   Fidelity Commodity Strategy Central Fund 4.5   Fidelity Inflation-Protected Bond Index Fund 4.4   US Treasury Bonds 2.4   Taiwan Semiconductor Manufacturing Co Ltd 1.4   NVIDIA Corp 1.3   Fidelity Enhanced Small Cap ETF 1.2   Fidelity Blue Chip Growth ETF 1.1     49.1  
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, 2025 to March 31, 2026.
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 $ 68,821,351
Holdings Count | shares 15
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$68,821,351
  
Number of Holdings
15
  
Portfolio Turnover
24%
  
Holdings [Text Block]         Common Stocks 32.2 Fixed-Income Funds 29.2 Bonds 23.4 Domestic Equity Funds 7.9 Preferred Stocks 0.1 Alternative Funds 0.1 Preferred Securities 0.1 Options 0.0 Short-Term Investments and Net Other Assets (Liabilities) 7.0 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 32.2                       Fixed-Income Funds - 29.2                  Bonds - 23.4                               Domestic Equity Funds - 7.9                Preferred Stocks - 0.1                     Alternative Funds - 0.1                    Preferred Securities - 0.1                 Options - 0.0                              Short-Term Investments and Net Other Assets (Liabilities) - 7.0  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     Fidelity International Bond Index Fund 14.9   Fidelity Short-Term Bond Fund 9.9   US Treasury Notes 8.0   Fidelity Commodity Strategy Central Fund 4.5   Fidelity Inflation-Protected Bond Index Fund 4.4   US Treasury Bonds 2.4   Taiwan Semiconductor Manufacturing Co Ltd 1.4   NVIDIA Corp 1.3   Fidelity Enhanced Small Cap ETF 1.2   Fidelity Blue Chip Growth ETF 1.1     49.1  
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, 2025 to March 31, 2026.
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 
0.57%
  
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.57%
Net Assets $ 6,038,200,916
Holdings Count | shares 35
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,038,200,916
  
Number of Holdings
35
  
Portfolio Turnover
12%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.9 AAA 0.5 AA 0.2 A 0.7 BBB 1.4 BB 0.5 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.2 Equities 86.1 Short-Term Investments and Net Other Assets (Liabilities) 1.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.9   AAA - 0.5                                  AA - 0.2                                   A - 0.7                                    BBB - 1.4                                  BB - 0.5                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.2                            Equities - 86.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.6   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)     Information Technology 19.2   Financials 14.4   Industrials 9.0   Consumer Discretionary 6.8   Health Care 6.4   Communication Services 6.2   Consumer Staples 3.7   Energy 3.7   Materials 3.4   Utilities 2.1   Real Estate 1.4     Equities 86.1 Bonds 12.3 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Equities - 86.1                            Bonds - 12.3                               Short-Term Investments and Net Other Assets (Liabilities) - 1.6  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.5   NVIDIA Corp 3.5   Fidelity Blue Chip Growth ETF 3.0   Alphabet Inc Class A 2.7   Apple Inc 2.5   Taiwan Semiconductor Manufacturing Co Ltd 2.1   Microsoft Corp 1.9   Amazon.com Inc 1.6   Fidelity Fundamental Small-Mid Cap ETF 1.5     27.1  
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, 2025 to March 31, 2026.
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 
$ 25 
0.50%
  
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.50%
Net Assets $ 6,038,200,916
Holdings Count | shares 35
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,038,200,916
  
Number of Holdings
35
  
Portfolio Turnover
12%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.9 AAA 0.5 AA 0.2 A 0.7 BBB 1.4 BB 0.5 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.2 Equities 86.1 Short-Term Investments and Net Other Assets (Liabilities) 1.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.9   AAA - 0.5                                  AA - 0.2                                   A - 0.7                                    BBB - 1.4                                  BB - 0.5                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.2                            Equities - 86.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.6   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)     Information Technology 19.2   Financials 14.4   Industrials 9.0   Consumer Discretionary 6.8   Health Care 6.4   Communication Services 6.2   Consumer Staples 3.7   Energy 3.7   Materials 3.4   Utilities 2.1   Real Estate 1.4     Equities 86.1 Bonds 12.3 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Equities - 86.1                            Bonds - 12.3                               Short-Term Investments and Net Other Assets (Liabilities) - 1.6  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.5   NVIDIA Corp 3.5   Fidelity Blue Chip Growth ETF 3.0   Alphabet Inc Class A 2.7   Apple Inc 2.5   Taiwan Semiconductor Manufacturing Co Ltd 2.1   Microsoft Corp 1.9   Amazon.com Inc 1.6   Fidelity Fundamental Small-Mid Cap ETF 1.5     27.1  
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, 2025 to March 31, 2026.
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 
1.11%
  
Expenses Paid, Amount $ 56
Expense Ratio, Percent 1.11%
Net Assets $ 6,038,200,916
Holdings Count | shares 35
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,038,200,916
  
Number of Holdings
35
  
Portfolio Turnover
12%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.9 AAA 0.5 AA 0.2 A 0.7 BBB 1.4 BB 0.5 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.2 Equities 86.1 Short-Term Investments and Net Other Assets (Liabilities) 1.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.9   AAA - 0.5                                  AA - 0.2                                   A - 0.7                                    BBB - 1.4                                  BB - 0.5                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.2                            Equities - 86.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.6   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)     Information Technology 19.2   Financials 14.4   Industrials 9.0   Consumer Discretionary 6.8   Health Care 6.4   Communication Services 6.2   Consumer Staples 3.7   Energy 3.7   Materials 3.4   Utilities 2.1   Real Estate 1.4     Equities 86.1 Bonds 12.3 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Equities - 86.1                            Bonds - 12.3                               Short-Term Investments and Net Other Assets (Liabilities) - 1.6  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.5   NVIDIA Corp 3.5   Fidelity Blue Chip Growth ETF 3.0   Alphabet Inc Class A 2.7   Apple Inc 2.5   Taiwan Semiconductor Manufacturing Co Ltd 2.1   Microsoft Corp 1.9   Amazon.com Inc 1.6   Fidelity Fundamental Small-Mid Cap ETF 1.5     27.1  
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, 2025 to March 31, 2026.
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 
0.61%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.61%
Net Assets $ 6,038,200,916
Holdings Count | shares 35
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,038,200,916
  
Number of Holdings
35
  
Portfolio Turnover
12%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.9 AAA 0.5 AA 0.2 A 0.7 BBB 1.4 BB 0.5 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.2 Equities 86.1 Short-Term Investments and Net Other Assets (Liabilities) 1.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.9   AAA - 0.5                                  AA - 0.2                                   A - 0.7                                    BBB - 1.4                                  BB - 0.5                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.2                            Equities - 86.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.6   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)     Information Technology 19.2   Financials 14.4   Industrials 9.0   Consumer Discretionary 6.8   Health Care 6.4   Communication Services 6.2   Consumer Staples 3.7   Energy 3.7   Materials 3.4   Utilities 2.1   Real Estate 1.4     Equities 86.1 Bonds 12.3 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Equities - 86.1                            Bonds - 12.3                               Short-Term Investments and Net Other Assets (Liabilities) - 1.6  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.5   NVIDIA Corp 3.5   Fidelity Blue Chip Growth ETF 3.0   Alphabet Inc Class A 2.7   Apple Inc 2.5   Taiwan Semiconductor Manufacturing Co Ltd 2.1   Microsoft Corp 1.9   Amazon.com Inc 1.6   Fidelity Fundamental Small-Mid Cap ETF 1.5     27.1  
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, 2025 to March 31, 2026.
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 
1.61%
  
Expenses Paid, Amount $ 81
Expense Ratio, Percent 1.61%
Net Assets $ 6,038,200,916
Holdings Count | shares 35
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,038,200,916
  
Number of Holdings
35
  
Portfolio Turnover
12%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.9 AAA 0.5 AA 0.2 A 0.7 BBB 1.4 BB 0.5 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.2 Equities 86.1 Short-Term Investments and Net Other Assets (Liabilities) 1.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.9   AAA - 0.5                                  AA - 0.2                                   A - 0.7                                    BBB - 1.4                                  BB - 0.5                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.2                            Equities - 86.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.6   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)     Information Technology 19.2   Financials 14.4   Industrials 9.0   Consumer Discretionary 6.8   Health Care 6.4   Communication Services 6.2   Consumer Staples 3.7   Energy 3.7   Materials 3.4   Utilities 2.1   Real Estate 1.4     Equities 86.1 Bonds 12.3 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Equities - 86.1                            Bonds - 12.3                               Short-Term Investments and Net Other Assets (Liabilities) - 1.6  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.5   NVIDIA Corp 3.5   Fidelity Blue Chip Growth ETF 3.0   Alphabet Inc Class A 2.7   Apple Inc 2.5   Taiwan Semiconductor Manufacturing Co Ltd 2.1   Microsoft Corp 1.9   Amazon.com Inc 1.6   Fidelity Fundamental Small-Mid Cap ETF 1.5     27.1  
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, 2025 to March 31, 2026.
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 
$ 43 
0.86%
  
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.86%
Net Assets $ 6,038,200,916
Holdings Count | shares 35
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,038,200,916
  
Number of Holdings
35
  
Portfolio Turnover
12%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 6.9 AAA 0.5 AA 0.2 A 0.7 BBB 1.4 BB 0.5 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.2 Equities 86.1 Short-Term Investments and Net Other Assets (Liabilities) 1.6 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 6.9   AAA - 0.5                                  AA - 0.2                                   A - 0.7                                    BBB - 1.4                                  BB - 0.5                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.2                            Equities - 86.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.6   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)     Information Technology 19.2   Financials 14.4   Industrials 9.0   Consumer Discretionary 6.8   Health Care 6.4   Communication Services 6.2   Consumer Staples 3.7   Energy 3.7   Materials 3.4   Utilities 2.1   Real Estate 1.4     Equities 86.1 Bonds 12.3 Short-Term Investments and Net Other Assets (Liabilities) 1.6 ASSET ALLOCATION (% of Fund's net assets)     Equities - 86.1                            Bonds - 12.3                               Short-Term Investments and Net Other Assets (Liabilities) - 1.6  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 4.8   Fidelity Enhanced Small Cap ETF 3.5   NVIDIA Corp 3.5   Fidelity Blue Chip Growth ETF 3.0   Alphabet Inc Class A 2.7   Apple Inc 2.5   Taiwan Semiconductor Manufacturing Co Ltd 2.1   Microsoft Corp 1.9   Amazon.com Inc 1.6   Fidelity Fundamental Small-Mid Cap ETF 1.5     27.1  
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, 2025 to March 31, 2026.
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% 
$ 28 
0.56%
  
Expenses Paid, Amount $ 28
Expense Ratio, Percent 0.56%
Net Assets $ 7,891,523,536
Holdings Count | shares 29
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$7,891,523,536
  
Number of Holdings
29
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.5 AAA 1.2 AA 0.2 A 1.5 BBB 2.9 BB 0.6 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.9 Equities 74.1 Short-Term Investments and Net Other Assets (Liabilities) 3.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.5   AAA - 1.2                                  AA - 0.2                                   A - 1.5                                    BBB - 2.9                                  BB - 0.6                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.9                            Equities - 74.1                            Short-Term Investments and Net Other Assets (Liabilities) - 3.2   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)     Information Technology 16.3   Financials 14.1   Industrials 8.2   Consumer Discretionary 5.9   Health Care 5.6   Communication Services 5.4   Energy 3.3   Consumer Staples 3.1   Materials 2.7   Utilities 2.0   Real Estate 1.4     Equities 74.1 Bonds 22.7 Short-Term Investments and Net Other Assets (Liabilities) 3.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 74.1                            Bonds - 22.7                               Short-Term Investments and Net Other Assets (Liabilities) - 3.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 8.7   Fidelity Enhanced Small Cap ETF 3.2   NVIDIA Corp 2.9   Fidelity Blue Chip Growth ETF 2.4   Alphabet Inc Class A 2.3   US Treasury Bonds 2.2   Apple Inc 2.0   Taiwan Semiconductor Manufacturing Co Ltd 1.8   Microsoft Corp 1.5   Amazon.com Inc 1.4     28.4  
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, 2025 to March 31, 2026.
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 
$ 25 
0.50%
  
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.50%
Net Assets $ 7,891,523,536
Holdings Count | shares 29
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$7,891,523,536
  
Number of Holdings
29
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.5 AAA 1.2 AA 0.2 A 1.5 BBB 2.9 BB 0.6 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.9 Equities 74.1 Short-Term Investments and Net Other Assets (Liabilities) 3.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.5   AAA - 1.2                                  AA - 0.2                                   A - 1.5                                    BBB - 2.9                                  BB - 0.6                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.9                            Equities - 74.1                            Short-Term Investments and Net Other Assets (Liabilities) - 3.2   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)     Information Technology 16.3   Financials 14.1   Industrials 8.2   Consumer Discretionary 5.9   Health Care 5.6   Communication Services 5.4   Energy 3.3   Consumer Staples 3.1   Materials 2.7   Utilities 2.0   Real Estate 1.4     Equities 74.1 Bonds 22.7 Short-Term Investments and Net Other Assets (Liabilities) 3.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 74.1                            Bonds - 22.7                               Short-Term Investments and Net Other Assets (Liabilities) - 3.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 8.7   Fidelity Enhanced Small Cap ETF 3.2   NVIDIA Corp 2.9   Fidelity Blue Chip Growth ETF 2.4   Alphabet Inc Class A 2.3   US Treasury Bonds 2.2   Apple Inc 2.0   Taiwan Semiconductor Manufacturing Co Ltd 1.8   Microsoft Corp 1.5   Amazon.com Inc 1.4     28.4  
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, 2025 to March 31, 2026.
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 
1.11%
  
Expenses Paid, Amount $ 56
Expense Ratio, Percent 1.11%
Net Assets $ 7,891,523,536
Holdings Count | shares 29
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$7,891,523,536
  
Number of Holdings
29
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.5 AAA 1.2 AA 0.2 A 1.5 BBB 2.9 BB 0.6 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.9 Equities 74.1 Short-Term Investments and Net Other Assets (Liabilities) 3.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.5   AAA - 1.2                                  AA - 0.2                                   A - 1.5                                    BBB - 2.9                                  BB - 0.6                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.9                            Equities - 74.1                            Short-Term Investments and Net Other Assets (Liabilities) - 3.2   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)     Information Technology 16.3   Financials 14.1   Industrials 8.2   Consumer Discretionary 5.9   Health Care 5.6   Communication Services 5.4   Energy 3.3   Consumer Staples 3.1   Materials 2.7   Utilities 2.0   Real Estate 1.4     Equities 74.1 Bonds 22.7 Short-Term Investments and Net Other Assets (Liabilities) 3.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 74.1                            Bonds - 22.7                               Short-Term Investments and Net Other Assets (Liabilities) - 3.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 8.7   Fidelity Enhanced Small Cap ETF 3.2   NVIDIA Corp 2.9   Fidelity Blue Chip Growth ETF 2.4   Alphabet Inc Class A 2.3   US Treasury Bonds 2.2   Apple Inc 2.0   Taiwan Semiconductor Manufacturing Co Ltd 1.8   Microsoft Corp 1.5   Amazon.com Inc 1.4     28.4  
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, 2025 to March 31, 2026.
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 
0.61%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.61%
Net Assets $ 7,891,523,536
Holdings Count | shares 29
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$7,891,523,536
  
Number of Holdings
29
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.5 AAA 1.2 AA 0.2 A 1.5 BBB 2.9 BB 0.6 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.9 Equities 74.1 Short-Term Investments and Net Other Assets (Liabilities) 3.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.5   AAA - 1.2                                  AA - 0.2                                   A - 1.5                                    BBB - 2.9                                  BB - 0.6                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.9                            Equities - 74.1                            Short-Term Investments and Net Other Assets (Liabilities) - 3.2   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)     Information Technology 16.3   Financials 14.1   Industrials 8.2   Consumer Discretionary 5.9   Health Care 5.6   Communication Services 5.4   Energy 3.3   Consumer Staples 3.1   Materials 2.7   Utilities 2.0   Real Estate 1.4     Equities 74.1 Bonds 22.7 Short-Term Investments and Net Other Assets (Liabilities) 3.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 74.1                            Bonds - 22.7                               Short-Term Investments and Net Other Assets (Liabilities) - 3.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 8.7   Fidelity Enhanced Small Cap ETF 3.2   NVIDIA Corp 2.9   Fidelity Blue Chip Growth ETF 2.4   Alphabet Inc Class A 2.3   US Treasury Bonds 2.2   Apple Inc 2.0   Taiwan Semiconductor Manufacturing Co Ltd 1.8   Microsoft Corp 1.5   Amazon.com Inc 1.4     28.4  
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, 2025 to March 31, 2026.
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 
1.61%
  
Expenses Paid, Amount $ 81
Expense Ratio, Percent 1.61%
Net Assets $ 7,891,523,536
Holdings Count | shares 29
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$7,891,523,536
  
Number of Holdings
29
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.5 AAA 1.2 AA 0.2 A 1.5 BBB 2.9 BB 0.6 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.9 Equities 74.1 Short-Term Investments and Net Other Assets (Liabilities) 3.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.5   AAA - 1.2                                  AA - 0.2                                   A - 1.5                                    BBB - 2.9                                  BB - 0.6                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.9                            Equities - 74.1                            Short-Term Investments and Net Other Assets (Liabilities) - 3.2   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)     Information Technology 16.3   Financials 14.1   Industrials 8.2   Consumer Discretionary 5.9   Health Care 5.6   Communication Services 5.4   Energy 3.3   Consumer Staples 3.1   Materials 2.7   Utilities 2.0   Real Estate 1.4     Equities 74.1 Bonds 22.7 Short-Term Investments and Net Other Assets (Liabilities) 3.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 74.1                            Bonds - 22.7                               Short-Term Investments and Net Other Assets (Liabilities) - 3.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 8.7   Fidelity Enhanced Small Cap ETF 3.2   NVIDIA Corp 2.9   Fidelity Blue Chip Growth ETF 2.4   Alphabet Inc Class A 2.3   US Treasury Bonds 2.2   Apple Inc 2.0   Taiwan Semiconductor Manufacturing Co Ltd 1.8   Microsoft Corp 1.5   Amazon.com Inc 1.4     28.4  
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, 2025 to March 31, 2026.
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 
$ 43 
0.86%
  
Expenses Paid, Amount $ 43
Expense Ratio, Percent 0.86%
Net Assets $ 7,891,523,536
Holdings Count | shares 29
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$7,891,523,536
  
Number of Holdings
29
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 13.5 AAA 1.2 AA 0.2 A 1.5 BBB 2.9 BB 0.6 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 1.9 Equities 74.1 Short-Term Investments and Net Other Assets (Liabilities) 3.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 13.5   AAA - 1.2                                  AA - 0.2                                   A - 1.5                                    BBB - 2.9                                  BB - 0.6                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 1.9                            Equities - 74.1                            Short-Term Investments and Net Other Assets (Liabilities) - 3.2   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)     Information Technology 16.3   Financials 14.1   Industrials 8.2   Consumer Discretionary 5.9   Health Care 5.6   Communication Services 5.4   Energy 3.3   Consumer Staples 3.1   Materials 2.7   Utilities 2.0   Real Estate 1.4     Equities 74.1 Bonds 22.7 Short-Term Investments and Net Other Assets (Liabilities) 3.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 74.1                            Bonds - 22.7                               Short-Term Investments and Net Other Assets (Liabilities) - 3.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 8.7   Fidelity Enhanced Small Cap ETF 3.2   NVIDIA Corp 2.9   Fidelity Blue Chip Growth ETF 2.4   Alphabet Inc Class A 2.3   US Treasury Bonds 2.2   Apple Inc 2.0   Taiwan Semiconductor Manufacturing Co Ltd 1.8   Microsoft Corp 1.5   Amazon.com Inc 1.4     28.4  
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, 2025 to March 31, 2026.
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% 
$ 29 
0.58%
  
Expenses Paid, Amount $ 29
Expense Ratio, Percent 0.58%
Net Assets $ 5,066,337,916
Holdings Count | shares 33
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$5,066,337,916
  
Number of Holdings
33
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 20.2 AAA 1.5 AA 0.2 A 2.2 BBB 4.8 BB 0.7 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 2.7 Equities 64.4 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 - 20.2   AAA - 1.5                                  AA - 0.2                                   A - 2.2                                    BBB - 4.8                                  BB - 0.7                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.7                            Equities - 64.4                            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)     Information Technology 14.1   Financials 13.8   Industrials 7.6   Consumer Discretionary 5.0   Health Care 4.9   Communication Services 4.8   Energy 3.3   Consumer Staples 2.6   Materials 2.5   Utilities 1.8   Real Estate 1.4     Equities 64.4 Bonds 33.2 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 64.4                            Bonds - 33.2                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 12.8   US Treasury Bonds 3.3   Fidelity Enhanced Small Cap ETF 2.6   NVIDIA Corp 2.5   Fidelity Blue Chip Growth ETF 2.1   Alphabet Inc Class A 2.0   Apple Inc 1.8   Taiwan Semiconductor Manufacturing Co Ltd 1.6   Microsoft Corp 1.3   Amazon.com Inc 1.2     31.2  
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, 2025 to March 31, 2026.
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 
0.51%
  
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.51%
Net Assets $ 5,066,337,916
Holdings Count | shares 33
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$5,066,337,916
  
Number of Holdings
33
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 20.2 AAA 1.5 AA 0.2 A 2.2 BBB 4.8 BB 0.7 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 2.7 Equities 64.4 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 - 20.2   AAA - 1.5                                  AA - 0.2                                   A - 2.2                                    BBB - 4.8                                  BB - 0.7                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.7                            Equities - 64.4                            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)     Information Technology 14.1   Financials 13.8   Industrials 7.6   Consumer Discretionary 5.0   Health Care 4.9   Communication Services 4.8   Energy 3.3   Consumer Staples 2.6   Materials 2.5   Utilities 1.8   Real Estate 1.4     Equities 64.4 Bonds 33.2 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 64.4                            Bonds - 33.2                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 12.8   US Treasury Bonds 3.3   Fidelity Enhanced Small Cap ETF 2.6   NVIDIA Corp 2.5   Fidelity Blue Chip Growth ETF 2.1   Alphabet Inc Class A 2.0   Apple Inc 1.8   Taiwan Semiconductor Manufacturing Co Ltd 1.6   Microsoft Corp 1.3   Amazon.com Inc 1.2     31.2  
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, 2025 to March 31, 2026.
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 
1.12%
  
Expenses Paid, Amount $ 56
Expense Ratio, Percent 1.12%
Net Assets $ 5,066,337,916
Holdings Count | shares 33
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$5,066,337,916
  
Number of Holdings
33
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 20.2 AAA 1.5 AA 0.2 A 2.2 BBB 4.8 BB 0.7 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 2.7 Equities 64.4 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 - 20.2   AAA - 1.5                                  AA - 0.2                                   A - 2.2                                    BBB - 4.8                                  BB - 0.7                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.7                            Equities - 64.4                            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)     Information Technology 14.1   Financials 13.8   Industrials 7.6   Consumer Discretionary 5.0   Health Care 4.9   Communication Services 4.8   Energy 3.3   Consumer Staples 2.6   Materials 2.5   Utilities 1.8   Real Estate 1.4     Equities 64.4 Bonds 33.2 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 64.4                            Bonds - 33.2                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 12.8   US Treasury Bonds 3.3   Fidelity Enhanced Small Cap ETF 2.6   NVIDIA Corp 2.5   Fidelity Blue Chip Growth ETF 2.1   Alphabet Inc Class A 2.0   Apple Inc 1.8   Taiwan Semiconductor Manufacturing Co Ltd 1.6   Microsoft Corp 1.3   Amazon.com Inc 1.2     31.2  
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, 2025 to March 31, 2026.
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 
0.62%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.62%
Net Assets $ 5,066,337,916
Holdings Count | shares 33
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$5,066,337,916
  
Number of Holdings
33
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 20.2 AAA 1.5 AA 0.2 A 2.2 BBB 4.8 BB 0.7 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 2.7 Equities 64.4 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 - 20.2   AAA - 1.5                                  AA - 0.2                                   A - 2.2                                    BBB - 4.8                                  BB - 0.7                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.7                            Equities - 64.4                            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)     Information Technology 14.1   Financials 13.8   Industrials 7.6   Consumer Discretionary 5.0   Health Care 4.9   Communication Services 4.8   Energy 3.3   Consumer Staples 2.6   Materials 2.5   Utilities 1.8   Real Estate 1.4     Equities 64.4 Bonds 33.2 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 64.4                            Bonds - 33.2                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 12.8   US Treasury Bonds 3.3   Fidelity Enhanced Small Cap ETF 2.6   NVIDIA Corp 2.5   Fidelity Blue Chip Growth ETF 2.1   Alphabet Inc Class A 2.0   Apple Inc 1.8   Taiwan Semiconductor Manufacturing Co Ltd 1.6   Microsoft Corp 1.3   Amazon.com Inc 1.2     31.2  
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, 2025 to March 31, 2026.
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 
$ 82 
1.62%
  
Expenses Paid, Amount $ 82
Expense Ratio, Percent 1.62%
Net Assets $ 5,066,337,916
Holdings Count | shares 33
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$5,066,337,916
  
Number of Holdings
33
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 20.2 AAA 1.5 AA 0.2 A 2.2 BBB 4.8 BB 0.7 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 2.7 Equities 64.4 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 - 20.2   AAA - 1.5                                  AA - 0.2                                   A - 2.2                                    BBB - 4.8                                  BB - 0.7                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.7                            Equities - 64.4                            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)     Information Technology 14.1   Financials 13.8   Industrials 7.6   Consumer Discretionary 5.0   Health Care 4.9   Communication Services 4.8   Energy 3.3   Consumer Staples 2.6   Materials 2.5   Utilities 1.8   Real Estate 1.4     Equities 64.4 Bonds 33.2 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 64.4                            Bonds - 33.2                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 12.8   US Treasury Bonds 3.3   Fidelity Enhanced Small Cap ETF 2.6   NVIDIA Corp 2.5   Fidelity Blue Chip Growth ETF 2.1   Alphabet Inc Class A 2.0   Apple Inc 1.8   Taiwan Semiconductor Manufacturing Co Ltd 1.6   Microsoft Corp 1.3   Amazon.com Inc 1.2     31.2  
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, 2025 to March 31, 2026.
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 
0.87%
  
Expenses Paid, Amount $ 44
Expense Ratio, Percent 0.87%
Net Assets $ 5,066,337,916
Holdings Count | shares 33
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$5,066,337,916
  
Number of Holdings
33
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 20.2 AAA 1.5 AA 0.2 A 2.2 BBB 4.8 BB 0.7 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 2.7 Equities 64.4 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 - 20.2   AAA - 1.5                                  AA - 0.2                                   A - 2.2                                    BBB - 4.8                                  BB - 0.7                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 2.7                            Equities - 64.4                            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)     Information Technology 14.1   Financials 13.8   Industrials 7.6   Consumer Discretionary 5.0   Health Care 4.9   Communication Services 4.8   Energy 3.3   Consumer Staples 2.6   Materials 2.5   Utilities 1.8   Real Estate 1.4     Equities 64.4 Bonds 33.2 Short-Term Investments and Net Other Assets (Liabilities) 2.4 ASSET ALLOCATION (% of Fund's net assets)     Equities - 64.4                            Bonds - 33.2                               Short-Term Investments and Net Other Assets (Liabilities) - 2.4  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 12.8   US Treasury Bonds 3.3   Fidelity Enhanced Small Cap ETF 2.6   NVIDIA Corp 2.5   Fidelity Blue Chip Growth ETF 2.1   Alphabet Inc Class A 2.0   Apple Inc 1.8   Taiwan Semiconductor Manufacturing Co Ltd 1.6   Microsoft Corp 1.3   Amazon.com Inc 1.2     31.2  
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, 2025 to March 31, 2026.
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% 
$ 24 
0.48%
  
Expenses Paid, Amount $ 24
Expense Ratio, Percent 0.48%
Net Assets $ 10,169,918,631
Holdings Count | shares 34
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$10,169,918,631
  
Number of Holdings
34
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 23.3 AAA 1.9 AA 0.2 A 2.4 BBB 5.5 BB 1.0 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 3.1 Equities 57.5 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 - 23.3   AAA - 1.9                                  AA - 0.2                                   A - 2.4                                    BBB - 5.5                                  BB - 1.0                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.1                            Equities - 57.5                            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.         Equities 57.5 Bonds 38.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 57.5                            Bonds - 38.3                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 14.6   US Treasury Bonds 3.9   Fidelity Enhanced Small Cap ETF 2.5   NVIDIA Corp 2.3   Fidelity Blue Chip Growth ETF 1.9   Alphabet Inc Class A 1.8   Apple Inc 1.6   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Fannie Mae Mortgage pass-thru certificates 1.3   Fidelity Hedged Equity ETF 1.2     32.5  
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, 2025 to March 31, 2026.
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 
0.41%
  
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.41%
Net Assets $ 10,169,918,631
Holdings Count | shares 34
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$10,169,918,631
  
Number of Holdings
34
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 23.3 AAA 1.9 AA 0.2 A 2.4 BBB 5.5 BB 1.0 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 3.1 Equities 57.5 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 - 23.3   AAA - 1.9                                  AA - 0.2                                   A - 2.4                                    BBB - 5.5                                  BB - 1.0                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.1                            Equities - 57.5                            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.         Equities 57.5 Bonds 38.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 57.5                            Bonds - 38.3                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 14.6   US Treasury Bonds 3.9   Fidelity Enhanced Small Cap ETF 2.5   NVIDIA Corp 2.3   Fidelity Blue Chip Growth ETF 1.9   Alphabet Inc Class A 1.8   Apple Inc 1.6   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Fannie Mae Mortgage pass-thru certificates 1.3   Fidelity Hedged Equity ETF 1.2     32.5  
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, 2025 to March 31, 2026.
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 
$ 51 
1.02%
  
Expenses Paid, Amount $ 51
Expense Ratio, Percent 1.02%
Net Assets $ 10,169,918,631
Holdings Count | shares 34
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$10,169,918,631
  
Number of Holdings
34
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 23.3 AAA 1.9 AA 0.2 A 2.4 BBB 5.5 BB 1.0 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 3.1 Equities 57.5 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 - 23.3   AAA - 1.9                                  AA - 0.2                                   A - 2.4                                    BBB - 5.5                                  BB - 1.0                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.1                            Equities - 57.5                            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.         Equities 57.5 Bonds 38.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 57.5                            Bonds - 38.3                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 14.6   US Treasury Bonds 3.9   Fidelity Enhanced Small Cap ETF 2.5   NVIDIA Corp 2.3   Fidelity Blue Chip Growth ETF 1.9   Alphabet Inc Class A 1.8   Apple Inc 1.6   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Fannie Mae Mortgage pass-thru certificates 1.3   Fidelity Hedged Equity ETF 1.2     32.5  
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, 2025 to March 31, 2026.
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 
$ 26 
0.52%
  
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.52%
Net Assets $ 10,169,918,631
Holdings Count | shares 34
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$10,169,918,631
  
Number of Holdings
34
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 23.3 AAA 1.9 AA 0.2 A 2.4 BBB 5.5 BB 1.0 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 3.1 Equities 57.5 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 - 23.3   AAA - 1.9                                  AA - 0.2                                   A - 2.4                                    BBB - 5.5                                  BB - 1.0                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.1                            Equities - 57.5                            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.         Equities 57.5 Bonds 38.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 57.5                            Bonds - 38.3                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 14.6   US Treasury Bonds 3.9   Fidelity Enhanced Small Cap ETF 2.5   NVIDIA Corp 2.3   Fidelity Blue Chip Growth ETF 1.9   Alphabet Inc Class A 1.8   Apple Inc 1.6   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Fannie Mae Mortgage pass-thru certificates 1.3   Fidelity Hedged Equity ETF 1.2     32.5  
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, 2025 to March 31, 2026.
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 
$ 77 
1.52%
  
Expenses Paid, Amount $ 77
Expense Ratio, Percent 1.52%
Net Assets $ 10,169,918,631
Holdings Count | shares 34
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$10,169,918,631
  
Number of Holdings
34
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 23.3 AAA 1.9 AA 0.2 A 2.4 BBB 5.5 BB 1.0 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 3.1 Equities 57.5 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 - 23.3   AAA - 1.9                                  AA - 0.2                                   A - 2.4                                    BBB - 5.5                                  BB - 1.0                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.1                            Equities - 57.5                            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.         Equities 57.5 Bonds 38.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 57.5                            Bonds - 38.3                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 14.6   US Treasury Bonds 3.9   Fidelity Enhanced Small Cap ETF 2.5   NVIDIA Corp 2.3   Fidelity Blue Chip Growth ETF 1.9   Alphabet Inc Class A 1.8   Apple Inc 1.6   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Fannie Mae Mortgage pass-thru certificates 1.3   Fidelity Hedged Equity ETF 1.2     32.5  
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, 2025 to March 31, 2026.
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 
0.77%
  
Expenses Paid, Amount $ 39
Expense Ratio, Percent 0.77%
Net Assets $ 10,169,918,631
Holdings Count | shares 34
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$10,169,918,631
  
Number of Holdings
34
  
Portfolio Turnover
13%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 23.3 AAA 1.9 AA 0.2 A 2.4 BBB 5.5 BB 1.0 B 0.6 CCC,CC,C 0.3 D 0.0 Not Rated 3.1 Equities 57.5 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 - 23.3   AAA - 1.9                                  AA - 0.2                                   A - 2.4                                    BBB - 5.5                                  BB - 1.0                                   B - 0.6                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.1                            Equities - 57.5                            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.         Equities 57.5 Bonds 38.3 Short-Term Investments and Net Other Assets (Liabilities) 4.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 57.5                            Bonds - 38.3                               Short-Term Investments and Net Other Assets (Liabilities) - 4.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 14.6   US Treasury Bonds 3.9   Fidelity Enhanced Small Cap ETF 2.5   NVIDIA Corp 2.3   Fidelity Blue Chip Growth ETF 1.9   Alphabet Inc Class A 1.8   Apple Inc 1.6   Taiwan Semiconductor Manufacturing Co Ltd 1.4   Fannie Mae Mortgage pass-thru certificates 1.3   Fidelity Hedged Equity ETF 1.2     32.5  
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, 2025 to March 31, 2026.
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% 
$ 23 
0.46%
  
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.46%
Net Assets $ 2,611,377,983
Holdings Count | shares 34
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,611,377,983
  
Number of Holdings
34
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 26.7 AAA 2.1 AA 0.3 A 2.9 BBB 6.0 BB 0.8 B 0.7 CCC,CC,C 0.3 D 0.0 Not Rated 3.5 Equities 47.5 Short-Term Investments and Net Other Assets (Liabilities) 9.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 26.7   AAA - 2.1                                  AA - 0.3                                   A - 2.9                                    BBB - 6.0                                  BB - 0.8                                   B - 0.7                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.5                            Equities - 47.5                            Short-Term Investments and Net Other Assets (Liabilities) - 9.2   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.         Equities 47.5 Bonds 43.3 Short-Term Investments and Net Other Assets (Liabilities) 9.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 47.5                            Bonds - 43.3                               Short-Term Investments and Net Other Assets (Liabilities) - 9.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 16.7   US Treasury Bonds 4.4   Fidelity Enhanced Small Cap ETF 2.0   NVIDIA Corp 1.9   Fidelity Blue Chip Growth ETF 1.5   Alphabet Inc Class A 1.5   Fannie Mae Mortgage pass-thru certificates 1.4   Ginnie Mae II Pool 1.4   Apple Inc 1.4   Freddie Mac Gold Pool 1.3     33.5  
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, 2025 to March 31, 2026.
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 $ 2,611,377,983
Holdings Count | shares 34
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,611,377,983
  
Number of Holdings
34
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 26.7 AAA 2.1 AA 0.3 A 2.9 BBB 6.0 BB 0.8 B 0.7 CCC,CC,C 0.3 D 0.0 Not Rated 3.5 Equities 47.5 Short-Term Investments and Net Other Assets (Liabilities) 9.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 26.7   AAA - 2.1                                  AA - 0.3                                   A - 2.9                                    BBB - 6.0                                  BB - 0.8                                   B - 0.7                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.5                            Equities - 47.5                            Short-Term Investments and Net Other Assets (Liabilities) - 9.2   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.         Equities 47.5 Bonds 43.3 Short-Term Investments and Net Other Assets (Liabilities) 9.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 47.5                            Bonds - 43.3                               Short-Term Investments and Net Other Assets (Liabilities) - 9.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 16.7   US Treasury Bonds 4.4   Fidelity Enhanced Small Cap ETF 2.0   NVIDIA Corp 1.9   Fidelity Blue Chip Growth ETF 1.5   Alphabet Inc Class A 1.5   Fannie Mae Mortgage pass-thru certificates 1.4   Ginnie Mae II Pool 1.4   Apple Inc 1.4   Freddie Mac Gold Pool 1.3     33.5  
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, 2025 to March 31, 2026.
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 $ 2,611,377,983
Holdings Count | shares 34
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,611,377,983
  
Number of Holdings
34
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 26.7 AAA 2.1 AA 0.3 A 2.9 BBB 6.0 BB 0.8 B 0.7 CCC,CC,C 0.3 D 0.0 Not Rated 3.5 Equities 47.5 Short-Term Investments and Net Other Assets (Liabilities) 9.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 26.7   AAA - 2.1                                  AA - 0.3                                   A - 2.9                                    BBB - 6.0                                  BB - 0.8                                   B - 0.7                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.5                            Equities - 47.5                            Short-Term Investments and Net Other Assets (Liabilities) - 9.2   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.         Equities 47.5 Bonds 43.3 Short-Term Investments and Net Other Assets (Liabilities) 9.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 47.5                            Bonds - 43.3                               Short-Term Investments and Net Other Assets (Liabilities) - 9.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 16.7   US Treasury Bonds 4.4   Fidelity Enhanced Small Cap ETF 2.0   NVIDIA Corp 1.9   Fidelity Blue Chip Growth ETF 1.5   Alphabet Inc Class A 1.5   Fannie Mae Mortgage pass-thru certificates 1.4   Ginnie Mae II Pool 1.4   Apple Inc 1.4   Freddie Mac Gold Pool 1.3     33.5  
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, 2025 to March 31, 2026.
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 $ 2,611,377,983
Holdings Count | shares 34
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,611,377,983
  
Number of Holdings
34
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 26.7 AAA 2.1 AA 0.3 A 2.9 BBB 6.0 BB 0.8 B 0.7 CCC,CC,C 0.3 D 0.0 Not Rated 3.5 Equities 47.5 Short-Term Investments and Net Other Assets (Liabilities) 9.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 26.7   AAA - 2.1                                  AA - 0.3                                   A - 2.9                                    BBB - 6.0                                  BB - 0.8                                   B - 0.7                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.5                            Equities - 47.5                            Short-Term Investments and Net Other Assets (Liabilities) - 9.2   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.         Equities 47.5 Bonds 43.3 Short-Term Investments and Net Other Assets (Liabilities) 9.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 47.5                            Bonds - 43.3                               Short-Term Investments and Net Other Assets (Liabilities) - 9.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 16.7   US Treasury Bonds 4.4   Fidelity Enhanced Small Cap ETF 2.0   NVIDIA Corp 1.9   Fidelity Blue Chip Growth ETF 1.5   Alphabet Inc Class A 1.5   Fannie Mae Mortgage pass-thru certificates 1.4   Ginnie Mae II Pool 1.4   Apple Inc 1.4   Freddie Mac Gold Pool 1.3     33.5  
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, 2025 to March 31, 2026.
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 
1.48%
  
Expenses Paid, Amount $ 74
Expense Ratio, Percent 1.48%
Net Assets $ 2,611,377,983
Holdings Count | shares 34
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,611,377,983
  
Number of Holdings
34
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 26.7 AAA 2.1 AA 0.3 A 2.9 BBB 6.0 BB 0.8 B 0.7 CCC,CC,C 0.3 D 0.0 Not Rated 3.5 Equities 47.5 Short-Term Investments and Net Other Assets (Liabilities) 9.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 26.7   AAA - 2.1                                  AA - 0.3                                   A - 2.9                                    BBB - 6.0                                  BB - 0.8                                   B - 0.7                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.5                            Equities - 47.5                            Short-Term Investments and Net Other Assets (Liabilities) - 9.2   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.         Equities 47.5 Bonds 43.3 Short-Term Investments and Net Other Assets (Liabilities) 9.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 47.5                            Bonds - 43.3                               Short-Term Investments and Net Other Assets (Liabilities) - 9.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 16.7   US Treasury Bonds 4.4   Fidelity Enhanced Small Cap ETF 2.0   NVIDIA Corp 1.9   Fidelity Blue Chip Growth ETF 1.5   Alphabet Inc Class A 1.5   Fannie Mae Mortgage pass-thru certificates 1.4   Ginnie Mae II Pool 1.4   Apple Inc 1.4   Freddie Mac Gold Pool 1.3     33.5  
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, 2025 to March 31, 2026.
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 
0.73%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.73%
Net Assets $ 2,611,377,983
Holdings Count | shares 34
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,611,377,983
  
Number of Holdings
34
  
Portfolio Turnover
11%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 26.7 AAA 2.1 AA 0.3 A 2.9 BBB 6.0 BB 0.8 B 0.7 CCC,CC,C 0.3 D 0.0 Not Rated 3.5 Equities 47.5 Short-Term Investments and Net Other Assets (Liabilities) 9.2 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 26.7   AAA - 2.1                                  AA - 0.3                                   A - 2.9                                    BBB - 6.0                                  BB - 0.8                                   B - 0.7                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.5                            Equities - 47.5                            Short-Term Investments and Net Other Assets (Liabilities) - 9.2   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.         Equities 47.5 Bonds 43.3 Short-Term Investments and Net Other Assets (Liabilities) 9.2 ASSET ALLOCATION (% of Fund's net assets)     Equities - 47.5                            Bonds - 43.3                               Short-Term Investments and Net Other Assets (Liabilities) - 9.2  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 16.7   US Treasury Bonds 4.4   Fidelity Enhanced Small Cap ETF 2.0   NVIDIA Corp 1.9   Fidelity Blue Chip Growth ETF 1.5   Alphabet Inc Class A 1.5   Fannie Mae Mortgage pass-thru certificates 1.4   Ginnie Mae II Pool 1.4   Apple Inc 1.4   Freddie Mac Gold Pool 1.3     33.5  
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, 2025 to March 31, 2026.
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 
0.46%
  
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.46%
Net Assets $ 2,166,836,431
Holdings Count | shares 36
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,166,836,431
  
Number of Holdings
36
  
Portfolio Turnover
18%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.7 AAA 2.5 AA 0.5 A 3.1 BBB 6.8 BB 0.9 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.7 Equities 42.4 Short-Term Investments and Net Other Assets (Liabilities) 9.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 29.7   AAA - 2.5                                  AA - 0.5                                   A - 3.1                                    BBB - 6.8                                  BB - 0.9                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.7                            Equities - 42.4                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3   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.         Bonds 53.0 Equities 37.7 Short-Term Investments and Net Other Assets (Liabilities) 9.3 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 53.0                               Equities - 37.7                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.5   US Treasury Bonds 5.0   Fidelity Low Duration Bond ETF 4.7   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.5   Fidelity Enhanced Small Cap ETF 1.5   NVIDIA Corp 1.5   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Blue Chip Growth ETF 1.2     38.3  
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, 2025 to March 31, 2026.
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 $ 2,166,836,431
Holdings Count | shares 36
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,166,836,431
  
Number of Holdings
36
  
Portfolio Turnover
18%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.7 AAA 2.5 AA 0.5 A 3.1 BBB 6.8 BB 0.9 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.7 Equities 42.4 Short-Term Investments and Net Other Assets (Liabilities) 9.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 29.7   AAA - 2.5                                  AA - 0.5                                   A - 3.1                                    BBB - 6.8                                  BB - 0.9                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.7                            Equities - 42.4                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3   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.         Bonds 53.0 Equities 37.7 Short-Term Investments and Net Other Assets (Liabilities) 9.3 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 53.0                               Equities - 37.7                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.5   US Treasury Bonds 5.0   Fidelity Low Duration Bond ETF 4.7   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.5   Fidelity Enhanced Small Cap ETF 1.5   NVIDIA Corp 1.5   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Blue Chip Growth ETF 1.2     38.3  
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, 2025 to March 31, 2026.
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 $ 2,166,836,431
Holdings Count | shares 36
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,166,836,431
  
Number of Holdings
36
  
Portfolio Turnover
18%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.7 AAA 2.5 AA 0.5 A 3.1 BBB 6.8 BB 0.9 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.7 Equities 42.4 Short-Term Investments and Net Other Assets (Liabilities) 9.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 29.7   AAA - 2.5                                  AA - 0.5                                   A - 3.1                                    BBB - 6.8                                  BB - 0.9                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.7                            Equities - 42.4                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3   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.         Bonds 53.0 Equities 37.7 Short-Term Investments and Net Other Assets (Liabilities) 9.3 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 53.0                               Equities - 37.7                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.5   US Treasury Bonds 5.0   Fidelity Low Duration Bond ETF 4.7   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.5   Fidelity Enhanced Small Cap ETF 1.5   NVIDIA Corp 1.5   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Blue Chip Growth ETF 1.2     38.3  
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, 2025 to March 31, 2026.
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 $ 2,166,836,431
Holdings Count | shares 36
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,166,836,431
  
Number of Holdings
36
  
Portfolio Turnover
18%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.7 AAA 2.5 AA 0.5 A 3.1 BBB 6.8 BB 0.9 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.7 Equities 42.4 Short-Term Investments and Net Other Assets (Liabilities) 9.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 29.7   AAA - 2.5                                  AA - 0.5                                   A - 3.1                                    BBB - 6.8                                  BB - 0.9                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.7                            Equities - 42.4                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3   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.         Bonds 53.0 Equities 37.7 Short-Term Investments and Net Other Assets (Liabilities) 9.3 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 53.0                               Equities - 37.7                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.5   US Treasury Bonds 5.0   Fidelity Low Duration Bond ETF 4.7   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.5   Fidelity Enhanced Small Cap ETF 1.5   NVIDIA Corp 1.5   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Blue Chip Growth ETF 1.2     38.3  
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, 2025 to March 31, 2026.
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 
1.48%
  
Expenses Paid, Amount $ 74
Expense Ratio, Percent 1.48%
Net Assets $ 2,166,836,431
Holdings Count | shares 36
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,166,836,431
  
Number of Holdings
36
  
Portfolio Turnover
18%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.7 AAA 2.5 AA 0.5 A 3.1 BBB 6.8 BB 0.9 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.7 Equities 42.4 Short-Term Investments and Net Other Assets (Liabilities) 9.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 29.7   AAA - 2.5                                  AA - 0.5                                   A - 3.1                                    BBB - 6.8                                  BB - 0.9                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.7                            Equities - 42.4                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3   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.         Bonds 53.0 Equities 37.7 Short-Term Investments and Net Other Assets (Liabilities) 9.3 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 53.0                               Equities - 37.7                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.5   US Treasury Bonds 5.0   Fidelity Low Duration Bond ETF 4.7   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.5   Fidelity Enhanced Small Cap ETF 1.5   NVIDIA Corp 1.5   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Blue Chip Growth ETF 1.2     38.3  
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, 2025 to March 31, 2026.
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 
0.73%
  
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.73%
Net Assets $ 2,166,836,431
Holdings Count | shares 36
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,166,836,431
  
Number of Holdings
36
  
Portfolio Turnover
18%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.7 AAA 2.5 AA 0.5 A 3.1 BBB 6.8 BB 0.9 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.7 Equities 42.4 Short-Term Investments and Net Other Assets (Liabilities) 9.3 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 29.7   AAA - 2.5                                  AA - 0.5                                   A - 3.1                                    BBB - 6.8                                  BB - 0.9                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.7                            Equities - 42.4                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3   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.         Bonds 53.0 Equities 37.7 Short-Term Investments and Net Other Assets (Liabilities) 9.3 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 53.0                               Equities - 37.7                            Short-Term Investments and Net Other Assets (Liabilities) - 9.3  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.5   US Treasury Bonds 5.0   Fidelity Low Duration Bond ETF 4.7   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.5   Fidelity Enhanced Small Cap ETF 1.5   NVIDIA Corp 1.5   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Blue Chip Growth ETF 1.2     38.3  
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, 2025 to March 31, 2026.
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% 
$ 22 
0.44%
  
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.44%
Net Assets $ 6,114,557,069
Holdings Count | shares 32
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,114,557,069
  
Number of Holdings
32
  
Portfolio Turnover
21%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.6 AAA 2.5 AA 0.4 A 3.0 BBB 6.9 BB 0.8 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.6 Equities 32.0 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 - 29.6   AAA - 2.5                                  AA - 0.4                                   A - 3.0                                    BBB - 6.9                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.6                            Equities - 32.0                            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 52.3 Equities 27.6 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 52.3                               Equities - 27.6                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.4   US Treasury Bonds 4.9   Fidelity Low Duration Bond ETF 4.4   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.6   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Hedged Equity ETF 1.2   Fidelity Commodity Strategy Central Fund 1.1   Fidelity Enhanced Small Cap ETF 1.1     37.1  
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, 2025 to March 31, 2026.
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 
0.41%
  
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.41%
Net Assets $ 6,114,557,069
Holdings Count | shares 32
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,114,557,069
  
Number of Holdings
32
  
Portfolio Turnover
21%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.6 AAA 2.5 AA 0.4 A 3.0 BBB 6.9 BB 0.8 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.6 Equities 32.0 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 - 29.6   AAA - 2.5                                  AA - 0.4                                   A - 3.0                                    BBB - 6.9                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.6                            Equities - 32.0                            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 52.3 Equities 27.6 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 52.3                               Equities - 27.6                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.4   US Treasury Bonds 4.9   Fidelity Low Duration Bond ETF 4.4   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.6   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Hedged Equity ETF 1.2   Fidelity Commodity Strategy Central Fund 1.1   Fidelity Enhanced Small Cap ETF 1.1     37.1  
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, 2025 to March 31, 2026.
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 
0.97%
  
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.97%
Net Assets $ 6,114,557,069
Holdings Count | shares 32
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,114,557,069
  
Number of Holdings
32
  
Portfolio Turnover
21%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.6 AAA 2.5 AA 0.4 A 3.0 BBB 6.9 BB 0.8 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.6 Equities 32.0 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 - 29.6   AAA - 2.5                                  AA - 0.4                                   A - 3.0                                    BBB - 6.9                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.6                            Equities - 32.0                            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 52.3 Equities 27.6 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 52.3                               Equities - 27.6                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.4   US Treasury Bonds 4.9   Fidelity Low Duration Bond ETF 4.4   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.6   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Hedged Equity ETF 1.2   Fidelity Commodity Strategy Central Fund 1.1   Fidelity Enhanced Small Cap ETF 1.1     37.1  
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, 2025 to March 31, 2026.
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 
$ 23 
0.47%
  
Expenses Paid, Amount $ 23
Expense Ratio, Percent 0.47%
Net Assets $ 6,114,557,069
Holdings Count | shares 32
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,114,557,069
  
Number of Holdings
32
  
Portfolio Turnover
21%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.6 AAA 2.5 AA 0.4 A 3.0 BBB 6.9 BB 0.8 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.6 Equities 32.0 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 - 29.6   AAA - 2.5                                  AA - 0.4                                   A - 3.0                                    BBB - 6.9                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.6                            Equities - 32.0                            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 52.3 Equities 27.6 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 52.3                               Equities - 27.6                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.4   US Treasury Bonds 4.9   Fidelity Low Duration Bond ETF 4.4   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.6   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Hedged Equity ETF 1.2   Fidelity Commodity Strategy Central Fund 1.1   Fidelity Enhanced Small Cap ETF 1.1     37.1  
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, 2025 to March 31, 2026.
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 
1.46%
  
Expenses Paid, Amount $ 74
Expense Ratio, Percent 1.46%
Net Assets $ 6,114,557,069
Holdings Count | shares 32
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,114,557,069
  
Number of Holdings
32
  
Portfolio Turnover
21%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.6 AAA 2.5 AA 0.4 A 3.0 BBB 6.9 BB 0.8 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.6 Equities 32.0 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 - 29.6   AAA - 2.5                                  AA - 0.4                                   A - 3.0                                    BBB - 6.9                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.6                            Equities - 32.0                            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 52.3 Equities 27.6 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 52.3                               Equities - 27.6                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.4   US Treasury Bonds 4.9   Fidelity Low Duration Bond ETF 4.4   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.6   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Hedged Equity ETF 1.2   Fidelity Commodity Strategy Central Fund 1.1   Fidelity Enhanced Small Cap ETF 1.1     37.1  
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, 2025 to March 31, 2026.
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 
0.72%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.72%
Net Assets $ 6,114,557,069
Holdings Count | shares 32
Investment Company Portfolio Turnover 21.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$6,114,557,069
  
Number of Holdings
32
  
Portfolio Turnover
21%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 29.6 AAA 2.5 AA 0.4 A 3.0 BBB 6.9 BB 0.8 B 0.8 CCC,CC,C 0.3 D 0.0 Not Rated 3.6 Equities 32.0 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 - 29.6   AAA - 2.5                                  AA - 0.4                                   A - 3.0                                    BBB - 6.9                                  BB - 0.8                                   B - 0.8                                    CCC,CC,C - 0.3                             D - 0.0                                    Not Rated - 3.6                            Equities - 32.0                            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 52.3 Equities 27.6 Short-Term Investments and Net Other Assets (Liabilities) 20.1 ASSET ALLOCATION (% of Fund's net assets)     Bonds - 52.3                               Equities - 27.6                            Short-Term Investments and Net Other Assets (Liabilities) - 20.1  
Largest Holdings [Text Block] TOP HOLDINGS(% of Fund's net assets)     US Treasury Notes 18.4   US Treasury Bonds 4.9   Fidelity Low Duration Bond ETF 4.4   Fannie Mae Mortgage pass-thru certificates 1.6   Ginnie Mae II Pool 1.6   Freddie Mac Gold Pool 1.4   Uniform Mortgage Backed Securities 1.4   Fidelity Hedged Equity ETF 1.2   Fidelity Commodity Strategy Central Fund 1.1   Fidelity Enhanced Small Cap ETF 1.1     37.1  
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, 2025 to March 31, 2026.
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 $ 1,326,452
Holdings Count | shares 4
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$1,326,452
  
Number of Holdings
4
  
Portfolio Turnover
12%
  
Holdings [Text Block]         Bond Funds 39.8 Domestic Equity Funds 35.1 International Equity Funds 15.1 Short-Term Funds 10.0 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Bond Funds - 39.8                          Domestic Equity Funds - 35.1               International Equity Funds - 15.1          Short-Term Funds - 10.0                    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 39.8   Fidelity Total Market Index Fund 35.1   Fidelity Total International Index Fund 15.1   Fidelity Short-Term Bond Index Fund 10.0     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, 2025 to March 31, 2026.
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 $ 2,046,158
Holdings Count | shares 3
Investment Company Portfolio Turnover 17.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of March 31, 2026)
 
KEY FACTS 
  
  
Fund Size
$2,046,158
  
Number of Holdings
3
  
Portfolio Turnover
17%
  
Holdings [Text Block]         Domestic Equity Funds 60.0 International Equity Funds 25.1 Bond Funds 14.9 Short-Term Investments and Net Other Assets (Liabilities) 0.0 ASSET ALLOCATION (% of Fund's net assets)     Domestic Equity Funds - 60.0               International Equity Funds - 25.1          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 60.0   Fidelity Total International Index Fund 25.1   Fidelity U.S. Bond Index Fund 14.9     100.0