| Form N-CSR Cover | 12 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Fidelity Central Investment Portfolios LLC |
| Entity Central Index Key | 0001303459 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 12 Months Ended |
| Sep. 30, 2024 USD ($) shares | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Fidelity Central Investment Portfolios LLC |
| Entity Central Index Key | 0001303459 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Fidelity Emerging Markets Equity Central Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Emerging Markets Equity Central Fund |
| Class Name | Fidelity® Emerging Markets Equity Central Fund |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® Emerging Markets Equity Central Fund for the period October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Emerging Markets Equity Central Fund $ 0.02 % |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.02% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • SM for the fiscal year. • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B25"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE September 30, 2014 through September 30, 2024. Initial investment of $10,000. Fidelity® Emerging Markets Equity Central Fund $10,000 $8,288 $9,905 $12,337 $11,819 $12,436 $14,390 $17,151 $11,498 $13,235 $16,648 Fidelity Emerging Markets Equity Central Fund Linked Index℠ $10,000 $8,076 $9,434 $11,558 $11,458 $11,259 $12,317 $14,488 $10,416 $11,639 $14,673 MSCI Emerging Markets Index $10,000 $8,076 $9,434 $11,558 $11,468 $11,240 $12,427 $14,691 $10,563 $11,802 $14,879 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Fidelity® Emerging Markets Equity Central Fund 25.79% 6.01% 5.23% Fidelity Emerging Markets Equity Central Fund Linked Index℠ 26.06% 5.44% 3.91% MSCI Emerging Markets Index 26.06% 5.77% 4.05% Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 2,505,309,202 |
| Holdings Count | shares | 262 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 42% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 262 Total Advisory Fee $ Portfolio Turnover 42 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Information Technology 23.0 Financials 21.0 Consumer Discretionary 16.2 Communication Services 9.2 Materials 6.8 Industrials 5.7 Consumer Staples 5.7 Energy 4.5 Health Care 3.1 Utilities 3.1 Real Estate 1.2 Common Stocks 98.7 Preferred Stocks 0.8 Bonds 0.1 Short-Term Investments and Net Other Assets (Liabilities) 0.4 ASSET ALLOCATION (% of Fund's net assets) China 31.2 India 17.5 Taiwan 16.6 Korea (South) 7.6 Brazil 5.9 South Africa 3.7 Saudi Arabia 3.7 Indonesia 2.5 United States 2.1 Others 9.2 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Taiwan Semiconductor Manufacturing Co Ltd 10.9 Tencent Holdings Ltd 5.0 Alibaba Group Holding Ltd 2.7 Samsung Electronics Co Ltd 2.6 HDFC Bank Ltd 2.4 SK Hynix Inc 2.2 PDD Holdings Inc Class A ADR 2.0 Meituan B Shares 1.7 Reliance Industries Ltd 1.7 Sea Ltd Class A ADR 1.6 32.8 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by November 29, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 . Effective March 1, 2024, the fund's management contract was amended to remove the fee the investment adviser received from investing funds. The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Material Fund Change Expenses [Text Block] | Effective March 1, 2024, the fund's management contract was amended to remove the fee the investment adviser received from investing funds. |
| Material Fund Change Adviser [Text Block] | The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by November 29, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 . |
| Updated Prospectus Phone Number | 1-800-544-8544</span>" id="sjs-B40"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B41"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Fidelity Floating Rate Central Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Floating Rate Central Fund |
| Class Name | Fidelity® Floating Rate Central Fund |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® Floating Rate Central Fund for the period October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Floating Rate Central Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B57"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE September 30, 2014 through September 30, 2024. Initial investment of $10,000. Fidelity® Floating Rate Central Fund $10,000 $9,997 $10,592 $11,204 $11,837 $12,334 $12,385 $13,499 $13,231 $15,037 $16,520 Morningstar® LSTA® US Performing Loans $10,000 $10,188 $10,769 $11,353 $11,975 $12,334 $12,501 $13,604 $13,250 $15,023 $16,506 Bloomberg U.S. Universal Bond Index $10,000 $10,233 $10,859 $10,963 $10,853 $11,946 $12,745 $12,771 $10,865 $11,040 $12,373 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Fidelity® Floating Rate Central Fund 9.87% 6.02% 5.15% Morningstar® LSTA® US Performing Loans 9.87% 6.00% 5.14% Bloomberg U.S. Universal Bond Index 12.08% 0.70% 2.15% Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 1,427,548,068 |
| Holdings Count | shares | 521 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 50% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 521 Total Advisory Fee $ Portfolio Turnover 50 % |
| Holdings [Text Block] | BBB 1.2 BB 21.3 B 58.6 CCC,CC,C 5.8 Not Rated 5.8 Equities 3.8 Short-Term Investments and Net Other Assets (Liabilities) 3.5 QUALITY DIVERSIFICATION (% of Fund's net assets) 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. Bank Loan Obligations 86.9 Corporate Bonds 5.5 Common Stocks 2.4 Alternative Funds 1.4 Preferred Securities 0.2 Asset-Backed Securities 0.1 Short-Term Investments and Net Other Assets (Liabilities) 3.5 ASSET ALLOCATION (% of Fund's net assets) United States 91.2 United Kingdom 2.2 Canada 1.6 Netherlands 1.1 Luxembourg 0.8 France 0.8 Ireland 0.5 Puerto Rico 0.5 Grand Cayman (UK Overseas Ter) 0.3 Others 1.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Great Outdoors Group LLC 2.6 Asurion LLC 2.3 Fidelity Private Credit Company LLC 1.4 Caesars Entertainment Inc 1.2 Acrisure LLC 1.2 Polaris Newco LLC 1.1 UKG Inc 1.1 Medline Borrower LP 1.0 MH Sub I LLC 0.9 Cloud Software Group Inc 0.9 13.7 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by November 29, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 . Effective March 1, 2024, the fund's management contract was amended to remove the fee the investment adviser received from investing funds. The fund added a contractual management fee waiver during the reporting period. |
| Material Fund Change Expenses [Text Block] | Effective March 1, 2024, the fund's management contract was amended to remove the fee the investment adviser received from investing funds. The fund added a contractual management fee waiver during the reporting period. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by November 29, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 . |
| Updated Prospectus Phone Number | 1-800-544-8544</span>" id="sjs-B71"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B72"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Fidelity International Equity Central Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® International Equity Central Fund |
| Class Name | Fidelity® International Equity Central Fund |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® International Equity Central Fund for the period October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® International Equity Central Fund $ 0.01 % |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.01% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B88"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? CUMULATIVE PERFORMANCE September 30, 2014 through September 30, 2024. Initial investment of $10,000. Fidelity® International Equity Central Fund $10,000 $9,322 $9,970 $11,918 $12,193 $12,167 $13,495 $17,330 $12,615 $15,867 $20,480 MSCI World ex USA (Linked 10/1/2015) Index $10,000 $9,147 $9,824 $11,688 $12,027 $11,941 $11,985 $15,192 $11,585 $14,398 $18,038 MSCI World ex USA Index $10,000 $9,001 $9,666 $11,500 $11,834 $11,750 $11,793 $14,948 $11,399 $14,167 $17,748 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year 10 Year Fidelity® International Equity Central Fund 29.07% 10.98% 7.43% MSCI World ex USA (Linked 10/1/2015) Index 25.28% 8.60% 6.08% MSCI World ex USA Index 25.28% 8.60% 5.90% Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 5,747,730,868 |
| Holdings Count | shares | 275 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 35% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 275 Total Advisory Fee $ Portfolio Turnover 35 % |
| Holdings [Text Block] | MARKET SECTORS (% of Fund's net assets) Financials 22.2 Industrials 20.2 Health Care 13.1 Information Technology 12.6 Consumer Discretionary 9.3 Materials 8.1 Consumer Staples 5.2 Energy 2.8 Communication Services 2.2 Utilities 1.3 Real Estate 0.9 Common Stocks 97.9 Preferred Stocks 0.0 Short-Term Investments and Net Other Assets (Liabilities) 2.1 ASSET ALLOCATION (% of Fund's net assets) Japan 18.1 United Kingdom 16.0 United States 13.4 France 9.5 Germany 9.0 Canada 6.5 Netherlands 4.5 Italy 3.8 Switzerland 3.1 Others 16.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) ASML Holding NV 2.7 Novo Nordisk A/S Series B 2.5 Hitachi Ltd 2.2 SAP SE 2.0 Astrazeneca PLC 2.0 LVMH Moet Hennessy Louis Vuitton SE 1.8 RELX PLC 1.7 Shin-Etsu Chemical Co Ltd 1.4 Air Liquide SA 1.4 Compass Group PLC 1.4 19.1 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by November 29, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 . Effective March 1, 2024, the fund's management contract was amended to remove the fee the investment adviser received from investing funds. The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Material Fund Change Expenses [Text Block] | Effective March 1, 2024, the fund's management contract was amended to remove the fee the investment adviser received from investing funds. |
| Material Fund Change Adviser [Text Block] | The fund's sub-advisory agreement with FIL Investments (Japan) Limited was not renewed. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by November 29, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 . |
| Updated Prospectus Phone Number | 1-800-544-8544</span>" id="sjs-B103"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B104"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Fidelity Real Estate Equity Central Fund | |
| Shareholder Report [Line Items] | |
| Fund Name | Fidelity® Real Estate Equity Central Fund |
| Class Name | Fidelity® Real Estate Equity Central Fund |
| No Trading Symbol Flag | true |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains information about Fidelity® Real Estate Equity Central Fund for the period October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | 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. |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| 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 year? (based on hypothetical $10,000 investment) FUND COST (PREVIOUS YEAR) Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Fidelity® Real Estate Equity Central Fund $ A 0.00 % B A Amount represents less than $.50 B Amount represents less than 0.005% |
| Expenses Paid, Amount | $ 0 |
| Expense Ratio, Percent | 0% |
| Factors Affecting Performance [Text Block] | What affected the Fund's performance this period? • • • • • • |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of the Fund's future performance.</span>" id="sjs-B120"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">The Fund's past performance is not a good predictor of the Fund's future performance.</span> |
| Line Graph [Table Text Block] | How did the Fund perform over the life of Fund? CUMULATIVE PERFORMANCE November 3, 2014 through September 30, 2024. Initial investment of $10,000. Fidelity® Real Estate Equity Central Fund $10,000 $9,819 $11,889 $12,121 $12,574 $14,960 $13,391 $17,862 $14,389 $14,950 $19,989 FTSE® NAREIT® Equity REITs Index $10,000 $9,916 $11,885 $11,964 $12,419 $14,706 $12,035 $16,535 $13,822 $14,234 $19,179 S&P 500® Index $10,000 $9,703 $11,200 $13,284 $15,663 $16,330 $18,803 $24,445 $20,663 $25,130 $34,265 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS: 1 Year 5 Year Life of Fund A Fidelity® Real Estate Equity Central Fund 33.70% 5.97% 7.23% FTSE® NAREIT® Equity REITs Index 34.74% 5.46% 6.79% S&P 500® Index 36.35% 15.98% 13.23% A From November 3, 2014 Visit www.fidelity.com for more recent performance information. The Fund's past performance is not a good predictor of the Fund's future performance. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Performance Inception Date | Nov. 03, 2014 |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Net Assets | $ 1,042,922,079 |
| Holdings Count | shares | 32 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 39% |
| Additional Fund Statistics [Text Block] | Key Fund Statistics (as of September 30, 2024) KEY FACTS Fund Size $ Number of Holdings 32 Total Advisory Fee $ Portfolio Turnover 39 % |
| Holdings [Text Block] | TOP INDUSTRIES (% of Fund's net assets) Specialized REITs 30.6 Residential REITs 17.9 Industrial REITs 16.7 Retail REITs 14.8 Health Care REITs 12.7 Hotel & Resort REITs 2.9 Real Estate Management & Development 1.6 Office REITs 1.6 Common Stocks 98.8 Short-Term Investments and Net Other Assets (Liabilities) 1.2 ASSET ALLOCATION (% of Fund's net assets) United States 100.0 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets) |
| Largest Holdings [Text Block] | TOP HOLDINGS (% of Fund's net assets) Prologis Inc 10.0 Equinix Inc 9.9 Ventas Inc 6.7 Public Storage Operating Co 5.9 CubeSmart 5.0 Welltower Inc 4.8 Essex Property Trust Inc 3.8 Mid-America Apartment Communities Inc 3.7 Invitation Homes Inc 3.5 Four Corners Property Trust Inc 3.4 56.7 |
| Material Fund Change [Text Block] | How has the Fund changed? This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by November 29, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 . Effective March 1, 2024, the fund's management contract was amended to remove the fee the investment adviser received from investing funds. |
| Material Fund Change Expenses [Text Block] | Effective March 1, 2024, the fund's management contract was amended to remove the fee the investment adviser received from investing funds. |
| Summary of Change Legend [Text Block] | This is a summary of certain changes to the Fund since October 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by November 29, 2024 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 . |
| Updated Prospectus Phone Number | 1-800-544-8544</span>" id="sjs-B135"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">1-800-544-8544</span> |
| Updated Prospectus Web Address | fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B136"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:bold;">fundresearch.fidelity.com/prospectus/sec</span> |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 60 Months Ended | 120 Months Ended | 132 Months Ended | ||||||||||
| Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | |
| C000071391_1_BBIndexMember_1YRMember | ||||||||||||||
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| Average Annual Return, Percent | 26.06% | |||||||||||||
| C000071391_1_BBIndexMember_5YRMember | ||||||||||||||
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| Average Annual Return, Percent | 5.77% | |||||||||||||
| C000071391_1_BBIndexMember_10YRMember | ||||||||||||||
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| Average Annual Return, Percent | 4.05% | |||||||||||||
| C000023055_1_BBIndexMember_1YRMember | ||||||||||||||
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| Average Annual Return, Percent | 12.08% | |||||||||||||
| C000023055_1_BBIndexMember_5YRMember | ||||||||||||||
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| Average Annual Return, Percent | 0.70% | |||||||||||||
| C000023055_1_BBIndexMember_10YRMember | ||||||||||||||
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| Average Annual Return, Percent | 2.15% | |||||||||||||
| C000059267_1_BBIndexMember_1YRMember | ||||||||||||||
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| Average Annual Return, Percent | 25.28% | |||||||||||||
| C000059267_1_BBIndexMember_5YRMember | ||||||||||||||
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| Average Annual Return, Percent | 8.60% | |||||||||||||
| C000059267_1_BBIndexMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 5.90% | |||||||||||||
| C000150640_1_BBIndexMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 36.35% | |||||||||||||
| C000150640_1_BBIndexMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 15.98% | |||||||||||||
| C000150640_1_BBIndexMember_LOCMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 13.23% | |||||||||||||
| C000071391_LG_ClassMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Fidelity® Emerging Markets Equity Central Fund</span>" id="sjs-E41"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Emerging Markets Equity Central Fund</span> | |||||||||||||
| C000071391_ClassMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 10,000 | |||||||||||||
| C000071391_ClassMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 8,288 | |||||||||||||
| C000071391_ClassMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 9,905 | |||||||||||||
| C000071391_ClassMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,337 | |||||||||||||
| C000071391_ClassMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 11,819 | |||||||||||||
| C000071391_ClassMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,436 | |||||||||||||
| C000071391_ClassMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 14,390 | |||||||||||||
| C000071391_ClassMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 17,151 | |||||||||||||
| C000071391_ClassMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 11,498 | |||||||||||||
| C000071391_ClassMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 13,235 | |||||||||||||
| C000071391_ClassMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 16,648 | $ 16,648 | $ 16,648 | $ 16,648 | ||||||||||
| C000071391_LG_1_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Fidelity Emerging Markets Equity Central Fund Linked Index℠</span>" id="sjs-E77"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity Emerging Markets Equity Central Fund Linked Index℠</span> | |||||||||||||
| C000071391_1_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000071391_1_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 8,076 | |||||||||||||
| C000071391_1_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 9,434 | |||||||||||||
| C000071391_1_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,558 | |||||||||||||
| C000071391_1_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,458 | |||||||||||||
| C000071391_1_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,259 | |||||||||||||
| C000071391_1_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,317 | |||||||||||||
| C000071391_1_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 14,488 | |||||||||||||
| C000071391_1_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,416 | |||||||||||||
| C000071391_1_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,639 | |||||||||||||
| C000071391_1_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 14,673 | 14,673 | 14,673 | $ 14,673 | ||||||||||
| C000071391_LG_2_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI Emerging Markets Index</span>" id="sjs-E113"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI Emerging Markets Index</span> | |||||||||||||
| C000071391_2_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000071391_2_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 8,076 | |||||||||||||
| C000071391_2_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 9,434 | |||||||||||||
| C000071391_2_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,558 | |||||||||||||
| C000071391_2_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,468 | |||||||||||||
| C000071391_2_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,240 | |||||||||||||
| C000071391_2_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,427 | |||||||||||||
| C000071391_2_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 14,691 | |||||||||||||
| C000071391_2_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,563 | |||||||||||||
| C000071391_2_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,802 | |||||||||||||
| C000071391_2_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 14,879 | $ 14,879 | $ 14,879 | $ 14,879 | ||||||||||
| C000071391_NoLoadClassMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 25.79% | |||||||||||||
| C000071391_NoLoadClassMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 6.01% | |||||||||||||
| C000071391_NoLoadClassMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 5.23% | |||||||||||||
| C000071391_0_AdditionalIndexMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 26.06% | |||||||||||||
| C000071391_0_AdditionalIndexMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 5.44% | |||||||||||||
| C000071391_0_AdditionalIndexMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 3.91% | |||||||||||||
| C000023055_LG_ClassMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Fidelity® Floating Rate Central Fund</span>" id="sjs-E167"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Floating Rate Central Fund</span> | |||||||||||||
| C000023055_ClassMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000023055_ClassMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 9,997 | |||||||||||||
| C000023055_ClassMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,592 | |||||||||||||
| C000023055_ClassMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,204 | |||||||||||||
| C000023055_ClassMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,837 | |||||||||||||
| C000023055_ClassMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,334 | |||||||||||||
| C000023055_ClassMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,385 | |||||||||||||
| C000023055_ClassMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 13,499 | |||||||||||||
| C000023055_ClassMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 13,231 | |||||||||||||
| C000023055_ClassMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 15,037 | |||||||||||||
| C000023055_ClassMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 16,520 | $ 16,520 | $ 16,520 | $ 16,520 | ||||||||||
| C000023055_LG_1_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Morningstar® LSTA® US Performing Loans</span>" id="sjs-E203"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Morningstar® LSTA® US Performing Loans</span> | |||||||||||||
| C000023055_1_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000023055_1_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,188 | |||||||||||||
| C000023055_1_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,769 | |||||||||||||
| C000023055_1_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,353 | |||||||||||||
| C000023055_1_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,975 | |||||||||||||
| C000023055_1_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,334 | |||||||||||||
| C000023055_1_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,501 | |||||||||||||
| C000023055_1_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 13,604 | |||||||||||||
| C000023055_1_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 13,250 | |||||||||||||
| C000023055_1_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 15,023 | |||||||||||||
| C000023055_1_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 16,506 | 16,506 | 16,506 | $ 16,506 | ||||||||||
| C000023055_LG_2_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Universal Bond Index</span>" id="sjs-E239"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Bloomberg U.S. Universal Bond Index</span> | |||||||||||||
| C000023055_2_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000023055_2_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,233 | |||||||||||||
| C000023055_2_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,859 | |||||||||||||
| C000023055_2_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,963 | |||||||||||||
| C000023055_2_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,853 | |||||||||||||
| C000023055_2_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,946 | |||||||||||||
| C000023055_2_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,745 | |||||||||||||
| C000023055_2_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,771 | |||||||||||||
| C000023055_2_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,865 | |||||||||||||
| C000023055_2_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,040 | |||||||||||||
| C000023055_2_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 12,373 | $ 12,373 | $ 12,373 | $ 12,373 | ||||||||||
| C000023055_NoLoadClassMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 9.87% | |||||||||||||
| C000023055_NoLoadClassMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 6.02% | |||||||||||||
| C000023055_NoLoadClassMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 5.15% | |||||||||||||
| C000023055_0_AdditionalIndexMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 9.87% | |||||||||||||
| C000023055_0_AdditionalIndexMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 6% | |||||||||||||
| C000023055_0_AdditionalIndexMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 5.14% | |||||||||||||
| C000059267_LG_ClassMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Fidelity® International Equity Central Fund</span>" id="sjs-E293"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® International Equity Central Fund</span> | |||||||||||||
| C000059267_ClassMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000059267_ClassMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 9,322 | |||||||||||||
| C000059267_ClassMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 9,970 | |||||||||||||
| C000059267_ClassMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,918 | |||||||||||||
| C000059267_ClassMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,193 | |||||||||||||
| C000059267_ClassMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,167 | |||||||||||||
| C000059267_ClassMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 13,495 | |||||||||||||
| C000059267_ClassMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 17,330 | |||||||||||||
| C000059267_ClassMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,615 | |||||||||||||
| C000059267_ClassMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 15,867 | |||||||||||||
| C000059267_ClassMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 20,480 | $ 20,480 | $ 20,480 | $ 20,480 | ||||||||||
| C000059267_LG_1_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI World ex USA (Linked 10/1/2015) Index</span>" id="sjs-E329"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI World ex USA (Linked 10/1/2015) Index</span> | |||||||||||||
| C000059267_1_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000059267_1_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 9,147 | |||||||||||||
| C000059267_1_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 9,824 | |||||||||||||
| C000059267_1_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,688 | |||||||||||||
| C000059267_1_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,027 | |||||||||||||
| C000059267_1_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,941 | |||||||||||||
| C000059267_1_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,985 | |||||||||||||
| C000059267_1_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 15,192 | |||||||||||||
| C000059267_1_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,585 | |||||||||||||
| C000059267_1_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 14,398 | |||||||||||||
| C000059267_1_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 18,038 | 18,038 | 18,038 | $ 18,038 | ||||||||||
| C000059267_LG_2_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI World ex USA Index</span>" id="sjs-E365"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">MSCI World ex USA Index</span> | |||||||||||||
| C000059267_2_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000059267_2_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 9,001 | |||||||||||||
| C000059267_2_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 9,666 | |||||||||||||
| C000059267_2_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,500 | |||||||||||||
| C000059267_2_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,834 | |||||||||||||
| C000059267_2_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,750 | |||||||||||||
| C000059267_2_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,793 | |||||||||||||
| C000059267_2_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 14,948 | |||||||||||||
| C000059267_2_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,399 | |||||||||||||
| C000059267_2_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 14,167 | |||||||||||||
| C000059267_2_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 17,748 | $ 17,748 | $ 17,748 | $ 17,748 | ||||||||||
| C000059267_NoLoadClassMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 29.07% | |||||||||||||
| C000059267_NoLoadClassMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 10.98% | |||||||||||||
| C000059267_NoLoadClassMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 7.43% | |||||||||||||
| C000059267_0_AdditionalIndexMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 25.28% | |||||||||||||
| C000059267_0_AdditionalIndexMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 8.60% | |||||||||||||
| C000059267_0_AdditionalIndexMember_10YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 6.08% | |||||||||||||
| C000150640_LG_ClassMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Fidelity® Real Estate Equity Central Fund</span>" id="sjs-E419"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">Fidelity® Real Estate Equity Central Fund</span> | |||||||||||||
| C000150640_ClassMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000150640_ClassMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 9,819 | |||||||||||||
| C000150640_ClassMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,889 | |||||||||||||
| C000150640_ClassMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,121 | |||||||||||||
| C000150640_ClassMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,574 | |||||||||||||
| C000150640_ClassMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 14,960 | |||||||||||||
| C000150640_ClassMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 13,391 | |||||||||||||
| C000150640_ClassMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 17,862 | |||||||||||||
| C000150640_ClassMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 14,389 | |||||||||||||
| C000150640_ClassMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 14,950 | |||||||||||||
| C000150640_ClassMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 19,989 | $ 19,989 | $ 19,989 | $ 19,989 | ||||||||||
| C000150640_LG_1_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | FTSE® NAREIT® Equity REITs Index</span>" id="sjs-E455"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">FTSE® NAREIT® Equity REITs Index</span> | |||||||||||||
| C000150640_1_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 10,000 | |||||||||||||
| C000150640_1_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 9,916 | |||||||||||||
| C000150640_1_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,885 | |||||||||||||
| C000150640_1_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 11,964 | |||||||||||||
| C000150640_1_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,419 | |||||||||||||
| C000150640_1_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 14,706 | |||||||||||||
| C000150640_1_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 12,035 | |||||||||||||
| C000150640_1_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 16,535 | |||||||||||||
| C000150640_1_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 13,822 | |||||||||||||
| C000150640_1_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 14,234 | |||||||||||||
| C000150640_1_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | 19,179 | 19,179 | 19,179 | $ 19,179 | ||||||||||
| C000150640_LG_2_AdditionalIndexMember_11YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P 500® Index</span>" id="sjs-E491"><span style="font-family:'Fidelity Sans';font-size:9px;color:#000000;font-style:normal;font-weight:normal;">S&P 500® Index</span> | |||||||||||||
| C000150640_2_AdditionalIndexMember_AsOf_2014Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 10,000 | |||||||||||||
| C000150640_2_AdditionalIndexMember_AsOf_2015Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 9,703 | |||||||||||||
| C000150640_2_AdditionalIndexMember_AsOf_2016Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 11,200 | |||||||||||||
| C000150640_2_AdditionalIndexMember_AsOf_2017Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 13,284 | |||||||||||||
| C000150640_2_AdditionalIndexMember_AsOf_2018Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 15,663 | |||||||||||||
| C000150640_2_AdditionalIndexMember_AsOf_2019Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 16,330 | |||||||||||||
| C000150640_2_AdditionalIndexMember_AsOf_2020Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 18,803 | |||||||||||||
| C000150640_2_AdditionalIndexMember_AsOf_2021Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 24,445 | |||||||||||||
| C000150640_2_AdditionalIndexMember_AsOf_2022Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 20,663 | |||||||||||||
| C000150640_2_AdditionalIndexMember_AsOf_2023Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 25,130 | |||||||||||||
| C000150640_2_AdditionalIndexMember_AsOf_2024Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Account Value | $ 34,265 | $ 34,265 | $ 34,265 | $ 34,265 | ||||||||||
| C000150640_NoLoadClassMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 33.70% | |||||||||||||
| C000150640_NoLoadClassMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 5.97% | |||||||||||||
| C000150640_NoLoadClassMember_2023-10-01_2024-09-30Member | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 7.23% | |||||||||||||
| C000150640_0_AdditionalIndexMember_1YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 34.74% | |||||||||||||
| C000150640_0_AdditionalIndexMember_5YRMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 5.46% | |||||||||||||
| C000150640_0_AdditionalIndexMember_LOCMember | ||||||||||||||
| Account Value [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 6.79% |
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 |
| Fidelity Emerging Markets Equity Central Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.90% |
| Fidelity Emerging Markets Equity Central Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Emerging Markets Equity Central Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity Emerging Markets Equity Central Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Emerging Markets Equity Central Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Emerging Markets Equity Central Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Emerging Markets Equity Central Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity Emerging Markets Equity Central Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Emerging Markets Equity Central Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity Emerging Markets Equity Central Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Emerging Markets Equity Central Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21% |
| Fidelity Emerging Markets Equity Central Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23% |
| Fidelity Emerging Markets Equity Central Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Emerging Markets Equity Central Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Emerging Markets Equity Central Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Emerging Markets Equity Central Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.80% |
| Fidelity Emerging Markets Equity Central Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| Fidelity Emerging Markets Equity Central Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.70% |
| Fidelity Emerging Markets Equity Central Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Fidelity Emerging Markets Equity Central Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity Emerging Markets Equity Central Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity Emerging Markets Equity Central Fund | China | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.20% |
| Fidelity Emerging Markets Equity Central Fund | India | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.50% |
| Fidelity Emerging Markets Equity Central Fund | Taiwan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.60% |
| Fidelity Emerging Markets Equity Central Fund | Korea, Republic of | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| Fidelity Emerging Markets Equity Central Fund | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Fidelity Emerging Markets Equity Central Fund | South Africa | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Emerging Markets Equity Central Fund | Saudi Arabia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Emerging Markets Equity Central Fund | Indonesia | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity Emerging Markets Equity Central Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Emerging Markets Equity Central Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.20% |
| Fidelity Emerging Markets Equity Central Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.70% |
| Fidelity Emerging Markets Equity Central Fund | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Emerging Markets Equity Central Fund | AABondsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity Emerging Markets Equity Central Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| Fidelity Floating Rate Central Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| Fidelity Floating Rate Central Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| Fidelity Floating Rate Central Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Floating Rate Central Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Floating Rate Central Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Floating Rate Central Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Floating Rate Central Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Floating Rate Central Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Floating Rate Central Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Floating Rate Central Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity Floating Rate Central Fund | QDBBBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
| Fidelity Floating Rate Central Fund | QDBBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.30% |
| Fidelity Floating Rate Central Fund | QDBMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 58.60% |
| Fidelity Floating Rate Central Fund | QDCCCCCCMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Floating Rate Central Fund | QDNotRatedMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| Fidelity Floating Rate Central Fund | QDEquitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Floating Rate Central Fund | QDShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Floating Rate Central Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 91.20% |
| Fidelity Floating Rate Central Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| Fidelity Floating Rate Central Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity Floating Rate Central Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Floating Rate Central Fund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| Fidelity Floating Rate Central Fund | Luxembourg | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Floating Rate Central Fund | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| Fidelity Floating Rate Central Fund | Ireland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Floating Rate Central Fund | Puerto Rico | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| Fidelity Floating Rate Central Fund | GrandCaymanUKOverseasTerMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| Fidelity Floating Rate Central Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| Fidelity Floating Rate Central Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Floating Rate Central Fund | AABankLoanObligationsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 86.90% |
| Fidelity Floating Rate Central Fund | AACorporateBondsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| Fidelity Floating Rate Central Fund | AAAlternativeFundsMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity Floating Rate Central Fund | AAPreferredSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| Fidelity Floating Rate Central Fund | AAAssetBackedSecuritiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.10% |
| Fidelity International Equity Central Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| Fidelity International Equity Central Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| Fidelity International Equity Central Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity International Equity Central Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity International Equity Central Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| Fidelity International Equity Central Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.80% |
| Fidelity International Equity Central Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.70% |
| Fidelity International Equity Central Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity International Equity Central Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity International Equity Central Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| Fidelity International Equity Central Fund | MSFinancialsSectorMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.20% |
| Fidelity International Equity Central Fund | Information Technology Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.60% |
| Fidelity International Equity Central Fund | Healthcare Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.10% |
| Fidelity International Equity Central Fund | Real Estate Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| Fidelity International Equity Central Fund | Industrial Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20.20% |
| Fidelity International Equity Central Fund | Materials Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.10% |
| Fidelity International Equity Central Fund | Consumer Discretionary Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| Fidelity International Equity Central Fund | Consumer Staples Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| Fidelity International Equity Central Fund | Communications Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| Fidelity International Equity Central Fund | Energy Sector | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| Fidelity International Equity Central Fund | Utilities Sector Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| Fidelity International Equity Central Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.40% |
| Fidelity International Equity Central Fund | OtherMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.10% |
| Fidelity International Equity Central Fund | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16% |
| Fidelity International Equity Central Fund | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| Fidelity International Equity Central Fund | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.50% |
| Fidelity International Equity Central Fund | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.50% |
| Fidelity International Equity Central Fund | Japan | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.10% |
| Fidelity International Equity Central Fund | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9% |
| Fidelity International Equity Central Fund | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity International Equity Central Fund | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| Fidelity International Equity Central Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 97.90% |
| Fidelity International Equity Central Fund | AAPreferredStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| Fidelity International Equity Central Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| Fidelity Real Estate Equity Central Fund | TH0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| Fidelity Real Estate Equity Central Fund | TH1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.90% |
| Fidelity Real Estate Equity Central Fund | TH2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| Fidelity Real Estate Equity Central Fund | TH3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| Fidelity Real Estate Equity Central Fund | TH4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| Fidelity Real Estate Equity Central Fund | TH5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.80% |
| Fidelity Real Estate Equity Central Fund | TH6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| Fidelity Real Estate Equity Central Fund | TH7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.70% |
| Fidelity Real Estate Equity Central Fund | TH8Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.50% |
| Fidelity Real Estate Equity Central Fund | TH9Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.40% |
| Fidelity Real Estate Equity Central Fund | TI0Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 30.60% |
| Fidelity Real Estate Equity Central Fund | TI1Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.90% |
| Fidelity Real Estate Equity Central Fund | TI2Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.70% |
| Fidelity Real Estate Equity Central Fund | TI3Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.80% |
| Fidelity Real Estate Equity Central Fund | TI4Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| Fidelity Real Estate Equity Central Fund | TI5Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| Fidelity Real Estate Equity Central Fund | TI6Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Real Estate Equity Central Fund | TI7Member | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| Fidelity Real Estate Equity Central Fund | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 100% |
| Fidelity Real Estate Equity Central Fund | AACommonStocksMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 98.80% |
| Fidelity Real Estate Equity Central Fund | AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.20% |
