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Shareholder Report
 6 Months Ended
Jun. 30, 2025
USD ($)
shares
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Fidelity School Street Trust
Entity Central Index Key 0000215829
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2025
Fidelity Series International Developed Markets Bond Index Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Series International Developed Markets Bond Index Fund
Class Name Fidelity® Series International Developed Markets Bond Index Fund
Trading Symbol FSTQX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Series International Developed Markets Bond Index Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544.
Additional Information Phone Number 1-800-544-8544
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Series International Developed Markets Bond Index 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 $ 14,503,046,766
Holdings Count | shares 702
Investment Company Portfolio Turnover 24.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$14,503,046,766
  
Number of Holdings
702
  
Portfolio Turnover
24%
  
Holdings [Text Block]   AAA 16.2 AA 16.0 A 10.4 BBB 3.8 Not Rated 53.2 Short-Term Investments and Net Other Assets (Liabilities) 0.4 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 16.2                                 AA - 16.0                                  A - 10.4                                   BBB - 3.8                                  Not Rated - 53.2                           Short-Term Investments and Net Other Assets (Liabilities) - 0.4   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.         Foreign Government and Government Agency Obligations 99.6 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets)     Foreign Government and Government Agency Obligations - 99.6   Short-Term Investments and Net Other Assets (Liabilities) - 0.4   Japan 20.1 France 6.5 Italy 6.2 Germany 5.2 Canada 4.9 Austria 4.8 Australia 4.8 Spain 4.7 Belgium 4.7 Others 38.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     Japan - 20.1                               France - 6.5                               Italy - 6.2                                Germany - 5.2                              Canada - 4.9                               Austria - 4.8                              Australia - 4.8                            Spain - 4.7                                Belgium - 4.7                              Others - 38.1                                 
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     Japan Government 20.1   French Government 6.5   Italian Republic 6.2   German Federal Republic 5.2   Canadian Government 4.9   Austrian Republic 4.8   Australian Commonwealth 4.8   Spanish Kingdom 4.7   Kingdom of Belgium 4.7   Dutch Government 4.7     66.6  
Fidelity Series International Credit Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Series International Credit Fund
Class Name Fidelity® Series International Credit Fund
Trading Symbol FCDSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Series International Credit Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544.
Additional Information Phone Number 1-800-544-8544
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Series International Credit 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 $ 122,257,588
Holdings Count | shares 251
Investment Company Portfolio Turnover 82.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$122,257,588
  
Number of Holdings
251
  
Portfolio Turnover
82%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 20.2 AAA 3.4 AA 1.0 A 14.8 BBB 41.2 BB 7.4 B 1.8 CCC,CC,C 0.4 D 0.5 Not Rated 4.5 Short-Term Investments and Net Other Assets (Liabilities) 4.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 20.2   AAA - 3.4                                  AA - 1.0                                   A - 14.8                                   BBB - 41.2                                 BB - 7.4                                   B - 1.8                                    CCC,CC,C - 0.4                             D - 0.5                                    Not Rated - 4.5                            Short-Term Investments and Net Other Assets (Liabilities) - 4.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 63.7 U.S. Treasury Obligations 20.2 Preferred Securities 7.6 Foreign Government and Government Agency Obligations 3.7 Short-Term Investments and Net Other Assets (Liabilities) 4.8 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 63.7                     U.S. Treasury Obligations - 20.2           Preferred Securities - 7.6                 Foreign Government and Government Agency Obligations - 3.7   Short-Term Investments and Net Other Assets (Liabilities) - 4.8   United States 31.2 United Kingdom 19.2 Germany 14.3 France 4.9 Switzerland 4.5 Canada 4.1 Netherlands 3.3 Denmark 2.8 Luxembourg 2.6 Others 13.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 31.2                       United Kingdom - 19.2                      Germany - 14.3                             France - 4.9                               Switzerland - 4.5                          Canada - 4.1                               Netherlands - 3.3                          Denmark - 2.8                              Luxembourg - 2.6                           Others - 13.1                                 
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 12.9   US Treasury Bonds 7.3   Canadian Government 2.3   HSBC Holdings PLC 2.2   UBS Group AG 2.1   ING Groep NV 2.0   Argentum Netherlands BV for Swiss Re Ltd 1.9   BNP Paribas SA 1.7   Bayer US Finance LLC 1.5   Aroundtown SA 1.4     35.3  
Fidelity Intermediate Municipal Income Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Intermediate Municipal Income Fund
Class Name Fidelity® Intermediate Municipal Income Fund
Trading Symbol FLTMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Intermediate Municipal Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Intermediate Municipal Income Fund 
$ 18 
0.37%
  
Expenses Paid, Amount $ 18
Expense Ratio, Percent 0.37%
Net Assets $ 13,136,915,780
Holdings Count | shares 3,182
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$13,136,915,780
  
Number of Holdings
3,182
  
Portfolio Turnover
10%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 38.1   Transportation 18.4   Health Care 13.0   Special Tax 7.6   Electric Utilities 5.2   Others(Individually Less Than 5%) 15.8   98.1       AAA 8.9 AA 43.0 A 35.9 BBB 6.8 BB 1.0 B 0.4 Not Rated 2.1 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 8.9                                  AA - 43.0                                  A - 35.9                                   BBB - 6.8                                  BB - 1.0                                   B - 0.4                                    Not Rated - 2.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.       TOP STATES (% of Fund's net assets) Texas 14.7 Illinois 8.9 Florida 6.6 New York 5.9 New Jersey 5.8      
Fidelity Advisor Intermediate Municipal Income Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity® Intermediate Municipal Income Fund
Class Name Fidelity Advisor® Intermediate Municipal Income Fund Class Z
Trading Symbol FIQZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Intermediate Municipal Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class Z 
$ 15 
0.31%
  
Expenses Paid, Amount $ 15
Expense Ratio, Percent 0.31%
Net Assets $ 13,136,915,780
Holdings Count | shares 3,182
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$13,136,915,780
  
Number of Holdings
3,182
  
Portfolio Turnover
10%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 38.1   Transportation 18.4   Health Care 13.0   Special Tax 7.6   Electric Utilities 5.2   Others(Individually Less Than 5%) 15.8   98.1       AAA 8.9 AA 43.0 A 35.9 BBB 6.8 BB 1.0 B 0.4 Not Rated 2.1 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 8.9                                  AA - 43.0                                  A - 35.9                                   BBB - 6.8                                  BB - 1.0                                   B - 0.4                                    Not Rated - 2.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.       TOP STATES (% of Fund's net assets) Texas 14.7 Illinois 8.9 Florida 6.6 New York 5.9 New Jersey 5.8      
Fidelity Advisor Intermediate Municipal Income Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity® Intermediate Municipal Income Fund
Class Name Fidelity Advisor® Intermediate Municipal Income Fund Class M
Trading Symbol FZITX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Intermediate Municipal Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 32 
0.65%
  
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.65%
Net Assets $ 13,136,915,780
Holdings Count | shares 3,182
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$13,136,915,780
  
Number of Holdings
3,182
  
Portfolio Turnover
10%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 38.1   Transportation 18.4   Health Care 13.0   Special Tax 7.6   Electric Utilities 5.2   Others(Individually Less Than 5%) 15.8   98.1       AAA 8.9 AA 43.0 A 35.9 BBB 6.8 BB 1.0 B 0.4 Not Rated 2.1 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 8.9                                  AA - 43.0                                  A - 35.9                                   BBB - 6.8                                  BB - 1.0                                   B - 0.4                                    Not Rated - 2.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.       TOP STATES (% of Fund's net assets) Texas 14.7 Illinois 8.9 Florida 6.6 New York 5.9 New Jersey 5.8      
Fidelity Advisor Intermediate Municipal Income Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity® Intermediate Municipal Income Fund
Class Name Fidelity Advisor® Intermediate Municipal Income Fund Class I
Trading Symbol FZIIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Intermediate Municipal Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 22 
0.44%
  
Expenses Paid, Amount $ 22
Expense Ratio, Percent 0.44%
Net Assets $ 13,136,915,780
Holdings Count | shares 3,182
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$13,136,915,780
  
Number of Holdings
3,182
  
Portfolio Turnover
10%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 38.1   Transportation 18.4   Health Care 13.0   Special Tax 7.6   Electric Utilities 5.2   Others(Individually Less Than 5%) 15.8   98.1       AAA 8.9 AA 43.0 A 35.9 BBB 6.8 BB 1.0 B 0.4 Not Rated 2.1 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 8.9                                  AA - 43.0                                  A - 35.9                                   BBB - 6.8                                  BB - 1.0                                   B - 0.4                                    Not Rated - 2.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.       TOP STATES (% of Fund's net assets) Texas 14.7 Illinois 8.9 Florida 6.6 New York 5.9 New Jersey 5.8      
Fidelity Advisor Intermediate Municipal Income Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity® Intermediate Municipal Income Fund
Class Name Fidelity Advisor® Intermediate Municipal Income Fund Class C
Trading Symbol FZICX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Intermediate Municipal Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 71 
1.43%
  
Expenses Paid, Amount $ 71
Expense Ratio, Percent 1.43%
Net Assets $ 13,136,915,780
Holdings Count | shares 3,182
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$13,136,915,780
  
Number of Holdings
3,182
  
Portfolio Turnover
10%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 38.1   Transportation 18.4   Health Care 13.0   Special Tax 7.6   Electric Utilities 5.2   Others(Individually Less Than 5%) 15.8   98.1       AAA 8.9 AA 43.0 A 35.9 BBB 6.8 BB 1.0 B 0.4 Not Rated 2.1 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 8.9                                  AA - 43.0                                  A - 35.9                                   BBB - 6.8                                  BB - 1.0                                   B - 0.4                                    Not Rated - 2.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.       TOP STATES (% of Fund's net assets) Texas 14.7 Illinois 8.9 Florida 6.6 New York 5.9 New Jersey 5.8      
Fidelity Advisor Intermediate Municipal Income Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity® Intermediate Municipal Income Fund
Class Name Fidelity Advisor® Intermediate Municipal Income Fund Class A
Trading Symbol FZIAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Intermediate Municipal Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 34 
0.68%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.68%
Net Assets $ 13,136,915,780
Holdings Count | shares 3,182
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$13,136,915,780
  
Number of Holdings
3,182
  
Portfolio Turnover
10%
  
Holdings [Text Block]   REVENUE SOURCES (% of Fund's net assets) General Obligations 38.1   Transportation 18.4   Health Care 13.0   Special Tax 7.6   Electric Utilities 5.2   Others(Individually Less Than 5%) 15.8   98.1       AAA 8.9 AA 43.0 A 35.9 BBB 6.8 BB 1.0 B 0.4 Not Rated 2.1 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     AAA - 8.9                                  AA - 43.0                                  A - 35.9                                   BBB - 6.8                                  BB - 1.0                                   B - 0.4                                    Not Rated - 2.1                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.       TOP STATES (% of Fund's net assets) Texas 14.7 Illinois 8.9 Florida 6.6 New York 5.9 New Jersey 5.8      
Fidelity Global Credit Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity® Global Credit Fund
Class Name Fidelity® Global Credit Fund
Trading Symbol FGBFX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Global Credit Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Global Credit Fund 
$ 25 
0.50%
  
Expenses Paid, Amount $ 25
Expense Ratio, Percent 0.50%
Net Assets $ 56,118,457
Holdings Count | shares 242
Investment Company Portfolio Turnover 69.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$56,118,457
  
Number of Holdings
242
  
Portfolio Turnover
69%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 18.1 AAA 0.2 AA 1.1 A 14.2 BBB 41.7 BB 10.8 B 3.4 CCC,CC,C 0.5 D 0.5 Not Rated 4.7 Short-Term Investments and Net Other Assets (Liabilities) 4.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 18.1   AAA - 0.2                                  AA - 1.1                                   A - 14.2                                   BBB - 41.7                                 BB - 10.8                                  B - 3.4                                    CCC,CC,C - 0.5                             D - 0.5                                    Not Rated - 4.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 66.7 U.S. Treasury Obligations 18.1 Preferred Securities 9.5 Foreign Government and Government Agency Obligations 0.9 Short-Term Investments and Net Other Assets (Liabilities) 4.8 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 66.7                     U.S. Treasury Obligations - 18.1           Preferred Securities - 9.5                 Foreign Government and Government Agency Obligations - 0.9   Short-Term Investments and Net Other Assets (Liabilities) - 4.8   United States 41.0 United Kingdom 15.7 Germany 13.0 France 4.9 Switzerland 3.3 Netherlands 2.9 Denmark 2.7 Luxembourg 2.3 Canada 2.0 Others 12.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 41.0                       United Kingdom - 15.7                      Germany - 13.0                             France - 4.9                               Switzerland - 3.3                          Netherlands - 2.9                          Denmark - 2.7                              Luxembourg - 2.3                           Canada - 2.0                               Others - 12.2                                 
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 10.9   US Treasury Bonds 7.2   Aroundtown SA 2.2   UBS Group AG 2.2   ING Groep NV 1.9   HSBC Holdings PLC 1.8   Bayer US Finance LLC 1.5   BNP Paribas SA 1.3   Bank of Nova Scotia/The 1.3   Prudential Funding Asia PLC 1.2     31.5  
Fidelity Advisor Global Credit Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity® Global Credit Fund
Class Name Fidelity Advisor® Global Credit Fund Class Z
Trading Symbol FIQYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Global Credit Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class Z 
$ 21 
0.41%
  
Expenses Paid, Amount $ 21
Expense Ratio, Percent 0.41%
Net Assets $ 56,118,457
Holdings Count | shares 242
Investment Company Portfolio Turnover 69.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$56,118,457
  
Number of Holdings
242
  
Portfolio Turnover
69%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 18.1 AAA 0.2 AA 1.1 A 14.2 BBB 41.7 BB 10.8 B 3.4 CCC,CC,C 0.5 D 0.5 Not Rated 4.7 Short-Term Investments and Net Other Assets (Liabilities) 4.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 18.1   AAA - 0.2                                  AA - 1.1                                   A - 14.2                                   BBB - 41.7                                 BB - 10.8                                  B - 3.4                                    CCC,CC,C - 0.5                             D - 0.5                                    Not Rated - 4.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 66.7 U.S. Treasury Obligations 18.1 Preferred Securities 9.5 Foreign Government and Government Agency Obligations 0.9 Short-Term Investments and Net Other Assets (Liabilities) 4.8 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 66.7                     U.S. Treasury Obligations - 18.1           Preferred Securities - 9.5                 Foreign Government and Government Agency Obligations - 0.9   Short-Term Investments and Net Other Assets (Liabilities) - 4.8   United States 41.0 United Kingdom 15.7 Germany 13.0 France 4.9 Switzerland 3.3 Netherlands 2.9 Denmark 2.7 Luxembourg 2.3 Canada 2.0 Others 12.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 41.0                       United Kingdom - 15.7                      Germany - 13.0                             France - 4.9                               Switzerland - 3.3                          Netherlands - 2.9                          Denmark - 2.7                              Luxembourg - 2.3                           Canada - 2.0                               Others - 12.2                                 
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 10.9   US Treasury Bonds 7.2   Aroundtown SA 2.2   UBS Group AG 2.2   ING Groep NV 1.9   HSBC Holdings PLC 1.8   Bayer US Finance LLC 1.5   BNP Paribas SA 1.3   Bank of Nova Scotia/The 1.3   Prudential Funding Asia PLC 1.2     31.5  
Fidelity Advisor Global Credit Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity® Global Credit Fund
Class Name Fidelity Advisor® Global Credit Fund Class M
Trading Symbol FGBWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Global Credit Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 38 
0.75%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.75%
Net Assets $ 56,118,457
Holdings Count | shares 242
Investment Company Portfolio Turnover 69.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$56,118,457
  
Number of Holdings
242
  
Portfolio Turnover
69%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 18.1 AAA 0.2 AA 1.1 A 14.2 BBB 41.7 BB 10.8 B 3.4 CCC,CC,C 0.5 D 0.5 Not Rated 4.7 Short-Term Investments and Net Other Assets (Liabilities) 4.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 18.1   AAA - 0.2                                  AA - 1.1                                   A - 14.2                                   BBB - 41.7                                 BB - 10.8                                  B - 3.4                                    CCC,CC,C - 0.5                             D - 0.5                                    Not Rated - 4.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 66.7 U.S. Treasury Obligations 18.1 Preferred Securities 9.5 Foreign Government and Government Agency Obligations 0.9 Short-Term Investments and Net Other Assets (Liabilities) 4.8 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 66.7                     U.S. Treasury Obligations - 18.1           Preferred Securities - 9.5                 Foreign Government and Government Agency Obligations - 0.9   Short-Term Investments and Net Other Assets (Liabilities) - 4.8   United States 41.0 United Kingdom 15.7 Germany 13.0 France 4.9 Switzerland 3.3 Netherlands 2.9 Denmark 2.7 Luxembourg 2.3 Canada 2.0 Others 12.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 41.0                       United Kingdom - 15.7                      Germany - 13.0                             France - 4.9                               Switzerland - 3.3                          Netherlands - 2.9                          Denmark - 2.7                              Luxembourg - 2.3                           Canada - 2.0                               Others - 12.2                                 
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 10.9   US Treasury Bonds 7.2   Aroundtown SA 2.2   UBS Group AG 2.2   ING Groep NV 1.9   HSBC Holdings PLC 1.8   Bayer US Finance LLC 1.5   BNP Paribas SA 1.3   Bank of Nova Scotia/The 1.3   Prudential Funding Asia PLC 1.2     31.5  
Fidelity Advisor Global Credit Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity® Global Credit Fund
Class Name Fidelity Advisor® Global Credit Fund Class I
Trading Symbol FGBIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Global Credit Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 26 
0.51%
  
Expenses Paid, Amount $ 26
Expense Ratio, Percent 0.51%
Net Assets $ 56,118,457
Holdings Count | shares 242
Investment Company Portfolio Turnover 69.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$56,118,457
  
Number of Holdings
242
  
Portfolio Turnover
69%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 18.1 AAA 0.2 AA 1.1 A 14.2 BBB 41.7 BB 10.8 B 3.4 CCC,CC,C 0.5 D 0.5 Not Rated 4.7 Short-Term Investments and Net Other Assets (Liabilities) 4.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 18.1   AAA - 0.2                                  AA - 1.1                                   A - 14.2                                   BBB - 41.7                                 BB - 10.8                                  B - 3.4                                    CCC,CC,C - 0.5                             D - 0.5                                    Not Rated - 4.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 66.7 U.S. Treasury Obligations 18.1 Preferred Securities 9.5 Foreign Government and Government Agency Obligations 0.9 Short-Term Investments and Net Other Assets (Liabilities) 4.8 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 66.7                     U.S. Treasury Obligations - 18.1           Preferred Securities - 9.5                 Foreign Government and Government Agency Obligations - 0.9   Short-Term Investments and Net Other Assets (Liabilities) - 4.8   United States 41.0 United Kingdom 15.7 Germany 13.0 France 4.9 Switzerland 3.3 Netherlands 2.9 Denmark 2.7 Luxembourg 2.3 Canada 2.0 Others 12.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 41.0                       United Kingdom - 15.7                      Germany - 13.0                             France - 4.9                               Switzerland - 3.3                          Netherlands - 2.9                          Denmark - 2.7                              Luxembourg - 2.3                           Canada - 2.0                               Others - 12.2                                 
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 10.9   US Treasury Bonds 7.2   Aroundtown SA 2.2   UBS Group AG 2.2   ING Groep NV 1.9   HSBC Holdings PLC 1.8   Bayer US Finance LLC 1.5   BNP Paribas SA 1.3   Bank of Nova Scotia/The 1.3   Prudential Funding Asia PLC 1.2     31.5  
Fidelity Advisor Global Credit Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity® Global Credit Fund
Class Name Fidelity Advisor® Global Credit Fund Class C
Trading Symbol FGBYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Global Credit Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 76 
1.50%
  
Expenses Paid, Amount $ 76
Expense Ratio, Percent 1.50%
Net Assets $ 56,118,457
Holdings Count | shares 242
Investment Company Portfolio Turnover 69.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$56,118,457
  
Number of Holdings
242
  
Portfolio Turnover
69%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 18.1 AAA 0.2 AA 1.1 A 14.2 BBB 41.7 BB 10.8 B 3.4 CCC,CC,C 0.5 D 0.5 Not Rated 4.7 Short-Term Investments and Net Other Assets (Liabilities) 4.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 18.1   AAA - 0.2                                  AA - 1.1                                   A - 14.2                                   BBB - 41.7                                 BB - 10.8                                  B - 3.4                                    CCC,CC,C - 0.5                             D - 0.5                                    Not Rated - 4.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 66.7 U.S. Treasury Obligations 18.1 Preferred Securities 9.5 Foreign Government and Government Agency Obligations 0.9 Short-Term Investments and Net Other Assets (Liabilities) 4.8 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 66.7                     U.S. Treasury Obligations - 18.1           Preferred Securities - 9.5                 Foreign Government and Government Agency Obligations - 0.9   Short-Term Investments and Net Other Assets (Liabilities) - 4.8   United States 41.0 United Kingdom 15.7 Germany 13.0 France 4.9 Switzerland 3.3 Netherlands 2.9 Denmark 2.7 Luxembourg 2.3 Canada 2.0 Others 12.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 41.0                       United Kingdom - 15.7                      Germany - 13.0                             France - 4.9                               Switzerland - 3.3                          Netherlands - 2.9                          Denmark - 2.7                              Luxembourg - 2.3                           Canada - 2.0                               Others - 12.2                                 
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 10.9   US Treasury Bonds 7.2   Aroundtown SA 2.2   UBS Group AG 2.2   ING Groep NV 1.9   HSBC Holdings PLC 1.8   Bayer US Finance LLC 1.5   BNP Paribas SA 1.3   Bank of Nova Scotia/The 1.3   Prudential Funding Asia PLC 1.2     31.5  
Fidelity Advisor Global Credit Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity® Global Credit Fund
Class Name Fidelity Advisor® Global Credit Fund Class A
Trading Symbol FGBZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity® Global Credit Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 38 
0.75%
  
Expenses Paid, Amount $ 38
Expense Ratio, Percent 0.75%
Net Assets $ 56,118,457
Holdings Count | shares 242
Investment Company Portfolio Turnover 69.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$56,118,457
  
Number of Holdings
242
  
Portfolio Turnover
69%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 18.1 AAA 0.2 AA 1.1 A 14.2 BBB 41.7 BB 10.8 B 3.4 CCC,CC,C 0.5 D 0.5 Not Rated 4.7 Short-Term Investments and Net Other Assets (Liabilities) 4.8 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 18.1   AAA - 0.2                                  AA - 1.1                                   A - 14.2                                   BBB - 41.7                                 BB - 10.8                                  B - 3.4                                    CCC,CC,C - 0.5                             D - 0.5                                    Not Rated - 4.7                            Short-Term Investments and Net Other Assets (Liabilities) - 4.8   We have used ratings from Moody's Investors Service, Inc. Where Moody's® ratings are not available, we have used S&P® ratings. All ratings are as of the date indicated and do not reflect subsequent changes.         Corporate Bonds 66.7 U.S. Treasury Obligations 18.1 Preferred Securities 9.5 Foreign Government and Government Agency Obligations 0.9 Short-Term Investments and Net Other Assets (Liabilities) 4.8 ASSET ALLOCATION (% of Fund's net assets)     Corporate Bonds - 66.7                     U.S. Treasury Obligations - 18.1           Preferred Securities - 9.5                 Foreign Government and Government Agency Obligations - 0.9   Short-Term Investments and Net Other Assets (Liabilities) - 4.8   United States 41.0 United Kingdom 15.7 Germany 13.0 France 4.9 Switzerland 3.3 Netherlands 2.9 Denmark 2.7 Luxembourg 2.3 Canada 2.0 Others 12.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)     United States - 41.0                       United Kingdom - 15.7                      Germany - 13.0                             France - 4.9                               Switzerland - 3.3                          Netherlands - 2.9                          Denmark - 2.7                              Luxembourg - 2.3                           Canada - 2.0                               Others - 12.2                                 
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Notes 10.9   US Treasury Bonds 7.2   Aroundtown SA 2.2   UBS Group AG 2.2   ING Groep NV 1.9   HSBC Holdings PLC 1.8   Bayer US Finance LLC 1.5   BNP Paribas SA 1.3   Bank of Nova Scotia/The 1.3   Prudential Funding Asia PLC 1.2     31.5  
Fidelity Multi-Asset Income Fund  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Multi-Asset Income Fund
Class Name Fidelity® Multi-Asset Income Fund
Trading Symbol FMSDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Multi-Asset Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-800-544-8544 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-800-544-8544
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Fidelity® Multi-Asset Income Fund 
$ 34 
0.67%
  
Expenses Paid, Amount $ 34
Expense Ratio, Percent 0.67%
Net Assets $ 2,878,703,773
Holdings Count | shares 342
Investment Company Portfolio Turnover 216.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,878,703,773
  
Number of Holdings
342
  
Portfolio Turnover
216%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 17.6 A 0.0 BBB 2.3 BB 6.3 B 6.3 CCC,CC,C 4.2 Not Rated 8.8 Equities 52.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 17.6   A - 0.0                                    BBB - 2.3                                  BB - 6.3                                   B - 6.3                                    CCC,CC,C - 4.2                             Not Rated - 8.8                            Equities - 52.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.         Common Stocks 45.4 U.S. Treasury Obligations 17.6 Corporate Bonds 13.1 Bank Loan Obligations 8.6 Preferred Stocks 5.5 Preferred Securities 3.3 Foreign Government and Government Agency Obligations 2.5 Alternative Funds 1.7 Asset-Backed Securities 0.4 CMOs and Other Mortgage Related Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 45.4                       U.S. Treasury Obligations - 17.6           Corporate Bonds - 13.1                     Bank Loan Obligations - 8.6                Preferred Stocks - 5.5                     Preferred Securities - 3.3                 Foreign Government and Government Agency Obligations - 2.5   Alternative Funds - 1.7                    Asset-Backed Securities - 0.4              CMOs and Other Mortgage Related Securities - 0.0   Short-Term Investments and Net Other Assets (Liabilities) - 1.9  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Bonds 17.6   NVIDIA Corp 3.5   Microsoft Corp 3.3   X Corp 2.6   DHT Holdings Inc 2.4   MicroStrategy Inc 2.4   Amazon.com Inc 2.4   Capital Power Corp 2.2   Brazilian Federative Republic 2.0   TransAlta Corp 1.9     40.3  
Fidelity Advisor Multi-Asset Income Fund - Class Z  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Multi-Asset Income Fund
Class Name Fidelity Advisor® Multi-Asset Income Fund Class Z
Trading Symbol FIWBX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Multi-Asset Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class Z 
$ 31 
0.61%
  
Expenses Paid, Amount $ 31
Expense Ratio, Percent 0.61%
Net Assets $ 2,878,703,773
Holdings Count | shares 342
Investment Company Portfolio Turnover 216.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,878,703,773
  
Number of Holdings
342
  
Portfolio Turnover
216%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 17.6 A 0.0 BBB 2.3 BB 6.3 B 6.3 CCC,CC,C 4.2 Not Rated 8.8 Equities 52.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 17.6   A - 0.0                                    BBB - 2.3                                  BB - 6.3                                   B - 6.3                                    CCC,CC,C - 4.2                             Not Rated - 8.8                            Equities - 52.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.         Common Stocks 45.4 U.S. Treasury Obligations 17.6 Corporate Bonds 13.1 Bank Loan Obligations 8.6 Preferred Stocks 5.5 Preferred Securities 3.3 Foreign Government and Government Agency Obligations 2.5 Alternative Funds 1.7 Asset-Backed Securities 0.4 CMOs and Other Mortgage Related Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 45.4                       U.S. Treasury Obligations - 17.6           Corporate Bonds - 13.1                     Bank Loan Obligations - 8.6                Preferred Stocks - 5.5                     Preferred Securities - 3.3                 Foreign Government and Government Agency Obligations - 2.5   Alternative Funds - 1.7                    Asset-Backed Securities - 0.4              CMOs and Other Mortgage Related Securities - 0.0   Short-Term Investments and Net Other Assets (Liabilities) - 1.9  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Bonds 17.6   NVIDIA Corp 3.5   Microsoft Corp 3.3   X Corp 2.6   DHT Holdings Inc 2.4   MicroStrategy Inc 2.4   Amazon.com Inc 2.4   Capital Power Corp 2.2   Brazilian Federative Republic 2.0   TransAlta Corp 1.9     40.3  
Fidelity Advisor Multi-Asset Income Fund - Class M  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Multi-Asset Income Fund
Class Name Fidelity Advisor® Multi-Asset Income Fund Class M
Trading Symbol FAZYX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Multi-Asset Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class M 
$ 49 
0.95%
  
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.95%
Net Assets $ 2,878,703,773
Holdings Count | shares 342
Investment Company Portfolio Turnover 216.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,878,703,773
  
Number of Holdings
342
  
Portfolio Turnover
216%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 17.6 A 0.0 BBB 2.3 BB 6.3 B 6.3 CCC,CC,C 4.2 Not Rated 8.8 Equities 52.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 17.6   A - 0.0                                    BBB - 2.3                                  BB - 6.3                                   B - 6.3                                    CCC,CC,C - 4.2                             Not Rated - 8.8                            Equities - 52.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.         Common Stocks 45.4 U.S. Treasury Obligations 17.6 Corporate Bonds 13.1 Bank Loan Obligations 8.6 Preferred Stocks 5.5 Preferred Securities 3.3 Foreign Government and Government Agency Obligations 2.5 Alternative Funds 1.7 Asset-Backed Securities 0.4 CMOs and Other Mortgage Related Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 45.4                       U.S. Treasury Obligations - 17.6           Corporate Bonds - 13.1                     Bank Loan Obligations - 8.6                Preferred Stocks - 5.5                     Preferred Securities - 3.3                 Foreign Government and Government Agency Obligations - 2.5   Alternative Funds - 1.7                    Asset-Backed Securities - 0.4              CMOs and Other Mortgage Related Securities - 0.0   Short-Term Investments and Net Other Assets (Liabilities) - 1.9  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Bonds 17.6   NVIDIA Corp 3.5   Microsoft Corp 3.3   X Corp 2.6   DHT Holdings Inc 2.4   MicroStrategy Inc 2.4   Amazon.com Inc 2.4   Capital Power Corp 2.2   Brazilian Federative Republic 2.0   TransAlta Corp 1.9     40.3  
Fidelity Advisor Multi-Asset Income Fund - Class I  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Multi-Asset Income Fund
Class Name Fidelity Advisor® Multi-Asset Income Fund Class I
Trading Symbol FAYZX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Multi-Asset Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class I 
$ 36 
0.71%
  
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.71%
Net Assets $ 2,878,703,773
Holdings Count | shares 342
Investment Company Portfolio Turnover 216.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,878,703,773
  
Number of Holdings
342
  
Portfolio Turnover
216%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 17.6 A 0.0 BBB 2.3 BB 6.3 B 6.3 CCC,CC,C 4.2 Not Rated 8.8 Equities 52.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 17.6   A - 0.0                                    BBB - 2.3                                  BB - 6.3                                   B - 6.3                                    CCC,CC,C - 4.2                             Not Rated - 8.8                            Equities - 52.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.         Common Stocks 45.4 U.S. Treasury Obligations 17.6 Corporate Bonds 13.1 Bank Loan Obligations 8.6 Preferred Stocks 5.5 Preferred Securities 3.3 Foreign Government and Government Agency Obligations 2.5 Alternative Funds 1.7 Asset-Backed Securities 0.4 CMOs and Other Mortgage Related Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 45.4                       U.S. Treasury Obligations - 17.6           Corporate Bonds - 13.1                     Bank Loan Obligations - 8.6                Preferred Stocks - 5.5                     Preferred Securities - 3.3                 Foreign Government and Government Agency Obligations - 2.5   Alternative Funds - 1.7                    Asset-Backed Securities - 0.4              CMOs and Other Mortgage Related Securities - 0.0   Short-Term Investments and Net Other Assets (Liabilities) - 1.9  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Bonds 17.6   NVIDIA Corp 3.5   Microsoft Corp 3.3   X Corp 2.6   DHT Holdings Inc 2.4   MicroStrategy Inc 2.4   Amazon.com Inc 2.4   Capital Power Corp 2.2   Brazilian Federative Republic 2.0   TransAlta Corp 1.9     40.3  
Fidelity Advisor Multi-Asset Income Fund - Class C  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Multi-Asset Income Fund
Class Name Fidelity Advisor® Multi-Asset Income Fund Class C
Trading Symbol FWBTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Multi-Asset Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class C 
$ 88 
1.72%
  
Expenses Paid, Amount $ 88
Expense Ratio, Percent 1.72%
Net Assets $ 2,878,703,773
Holdings Count | shares 342
Investment Company Portfolio Turnover 216.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,878,703,773
  
Number of Holdings
342
  
Portfolio Turnover
216%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 17.6 A 0.0 BBB 2.3 BB 6.3 B 6.3 CCC,CC,C 4.2 Not Rated 8.8 Equities 52.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 17.6   A - 0.0                                    BBB - 2.3                                  BB - 6.3                                   B - 6.3                                    CCC,CC,C - 4.2                             Not Rated - 8.8                            Equities - 52.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.         Common Stocks 45.4 U.S. Treasury Obligations 17.6 Corporate Bonds 13.1 Bank Loan Obligations 8.6 Preferred Stocks 5.5 Preferred Securities 3.3 Foreign Government and Government Agency Obligations 2.5 Alternative Funds 1.7 Asset-Backed Securities 0.4 CMOs and Other Mortgage Related Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 45.4                       U.S. Treasury Obligations - 17.6           Corporate Bonds - 13.1                     Bank Loan Obligations - 8.6                Preferred Stocks - 5.5                     Preferred Securities - 3.3                 Foreign Government and Government Agency Obligations - 2.5   Alternative Funds - 1.7                    Asset-Backed Securities - 0.4              CMOs and Other Mortgage Related Securities - 0.0   Short-Term Investments and Net Other Assets (Liabilities) - 1.9  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Bonds 17.6   NVIDIA Corp 3.5   Microsoft Corp 3.3   X Corp 2.6   DHT Holdings Inc 2.4   MicroStrategy Inc 2.4   Amazon.com Inc 2.4   Capital Power Corp 2.2   Brazilian Federative Republic 2.0   TransAlta Corp 1.9     40.3  
Fidelity Advisor Multi-Asset Income Fund - Class A  
Shareholder Report [Line Items]  
Fund Name Fidelity Advisor® Multi-Asset Income Fund
Class Name Fidelity Advisor® Multi-Asset Income Fund Class A
Trading Symbol FWATX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains information about Fidelity Advisor® Multi-Asset Income Fund for the period January 1, 2025 to June 30, 2025.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at fundresearch.fidelity.com/prospectus/sec. You can also request this information by contacting us at 1-877-208-0098 or by sending an e-mail to fidfunddocuments@fidelity.com.
Additional Information Phone Number 1-877-208-0098
Additional Information Email fidfunddocuments@fidelity.com
Additional Information Website fundresearch.fidelity.com/prospectus/sec
Expenses [Text Block] What were your Fund costs for the last six months?
(based on hypothetical $10,000 investment)
 
 
 
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
 
Class A 
$ 49 
0.96%
  
Expenses Paid, Amount $ 49
Expense Ratio, Percent 0.96%
Net Assets $ 2,878,703,773
Holdings Count | shares 342
Investment Company Portfolio Turnover 216.00%
Additional Fund Statistics [Text Block] Key Fund Statistics
(as of June 30, 2025)
 
KEY FACTS 
  
  
Fund Size
$2,878,703,773
  
Number of Holdings
342
  
Portfolio Turnover
216%
  
Holdings [Text Block]   U.S. Government and U.S. Government Agency Obligations 17.6 A 0.0 BBB 2.3 BB 6.3 B 6.3 CCC,CC,C 4.2 Not Rated 8.8 Equities 52.6 Short-Term Investments and Net Other Assets (Liabilities) 1.9 QUALITY DIVERSIFICATION (% of Fund's net assets)     U.S. Government and U.S. Government Agency Obligations - 17.6   A - 0.0                                    BBB - 2.3                                  BB - 6.3                                   B - 6.3                                    CCC,CC,C - 4.2                             Not Rated - 8.8                            Equities - 52.6                            Short-Term Investments and Net Other Assets (Liabilities) - 1.9   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.         Common Stocks 45.4 U.S. Treasury Obligations 17.6 Corporate Bonds 13.1 Bank Loan Obligations 8.6 Preferred Stocks 5.5 Preferred Securities 3.3 Foreign Government and Government Agency Obligations 2.5 Alternative Funds 1.7 Asset-Backed Securities 0.4 CMOs and Other Mortgage Related Securities 0.0 Short-Term Investments and Net Other Assets (Liabilities) 1.9 ASSET ALLOCATION (% of Fund's net assets)     Common Stocks - 45.4                       U.S. Treasury Obligations - 17.6           Corporate Bonds - 13.1                     Bank Loan Obligations - 8.6                Preferred Stocks - 5.5                     Preferred Securities - 3.3                 Foreign Government and Government Agency Obligations - 2.5   Alternative Funds - 1.7                    Asset-Backed Securities - 0.4              CMOs and Other Mortgage Related Securities - 0.0   Short-Term Investments and Net Other Assets (Liabilities) - 1.9  
Largest Holdings [Text Block] TOP HOLDINGS (% of Fund's net assets)     US Treasury Bonds 17.6   NVIDIA Corp 3.5   Microsoft Corp 3.3   X Corp 2.6   DHT Holdings Inc 2.4   MicroStrategy Inc 2.4   Amazon.com Inc 2.4   Capital Power Corp 2.2   Brazilian Federative Republic 2.0   TransAlta Corp 1.9     40.3