Fidelity Concord Street Trust N-CSR22 Jan 25Certified annual shareholder report (management investment company)Financial data

Company Profile

Form N-CSR Cover

Form N-CSR Cover	12 Months Ended
Form N-CSR Cover	Nov. 30, 2024
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Fidelity Concord Street Trust
Entity Central Index Key	0000819118
Entity Investment Company Type	N-1A
Document Period End Date	Nov. 30, 2024

Shareholder Report

Shareholder Report	12 Months Ended
Shareholder Report	Nov. 30, 2024 USD ($) shares
Shareholder Report [Line Items]
Document Type	N-CSR
Amendment Flag	false
Registrant Name	Fidelity Concord Street Trust
Entity Central Index Key	0000819118
Entity Investment Company Type	N-1A
Document Period End Date	Nov. 30, 2024
Fidelity Nasdaq Composite Index Fund
Shareholder Report [Line Items]
Fund Name	Fidelity® Nasdaq Composite Index® Fund
Class Name	Fidelity® Nasdaq Composite Index® Fund
Trading Symbol	FNCMX
Annual or Semi-Annual Statement [Text Block]	This annual shareholder report contains information about Fidelity® Nasdaq Composite Index® Fund for the period December 1, 2023 to November 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 or by sending an e-mail to fidfunddocuments@fidelity.com.
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 Email	fidfunddocuments@fidelity.com
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® Nasdaq Composite Index® Fund $ 0.29 %
Expenses Paid, Amount	$ 34
Expense Ratio, Percent	0.29%
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-B26"><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 November 30, 2014 through November 30, 2024. Initial investment of $10,000. Fidelity® Nasdaq Composite Index® Fund $10,000 $10,770 $11,355 $14,792 $15,872 $18,975 $26,874 $34,447 $25,706 $32,263 $43,874 Nasdaq Composite Index® $10,000 $10,786 $11,382 $14,860 $16,012 $19,136 $27,185 $34,852 $25,934 $32,451 $44,150 S&P 500® Index $10,000 $10,275 $11,103 $13,642 $14,498 $16,834 $19,773 $25,294 $22,964 $26,142 $35,002 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® Nasdaq Composite Index® Fund 35.99% 18.25% 15.94% Nasdaq Composite Index® 36.05% 18.20% 16.01% S&P 500® Index 33.89% 15.77% 13.35% 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	$ 18,708,130,222
Holdings Count \| shares	2,834
Advisory Fees Paid, Amount	$ 43,468,164
Investment Company Portfolio Turnover	2%
Additional Fund Statistics [Text Block]	Key Fund Statistics (as of November 30, 2024) KEY FACTS Fund Size $ Number of Holdings 2,834 Total Advisory Fee $ Portfolio Turnover 2 %
Holdings [Text Block]	MARKET SECTORS (% of Fund's net assets) Information Technology 49.2 Consumer Discretionary 14.9 Communication Services 14.3 Health Care 6.0 Industrials 4.4 Financials 4.1 Consumer Staples 3.5 Real Estate 1.0 Materials 0.9 Utilities 0.9 Energy 0.6 Common Stocks 99.8 Preferred Stocks 0.0 Short-Term Investments and Net Other Assets (Liabilities) 0.2 ASSET ALLOCATION (% of Fund's net assets) United States 97.2 China 0.9 Brazil 0.5 Israel 0.3 Netherlands 0.3 United Kingdom 0.3 Canada 0.2 Kazakhstan 0.1 Singapore 0.1 Others 0.1 GEOGRAPHIC DIVERSIFICATION (% of Fund's net assets)
Largest Holdings [Text Block]	TOP HOLDINGS (% of Fund's net assets) Apple Inc 11.5 NVIDIA Corp 10.9 Microsoft Corp 10.1 Amazon.com Inc 7.0 Meta Platforms Inc Class A 4.0 Tesla Inc 3.6 Alphabet Inc Class A 3.3 Alphabet Inc Class C 3.0 Broadcom Inc 2.5 Costco Wholesale Corp 1.5 57.4
Material Fund Change [Text Block]	How has the Fund changed? This is a summary of certain changes to the Fund since December 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by January 29, 2025 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com . Effective June 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Material Fund Change Expenses [Text Block]	Effective June 1, 2024, the fund's management contract was amended to incorporate administrative services previously covered under separate services agreements (transfer agent and pricing & bookkeeping). The amended contract incorporates a management fee rate that may vary by class. The Adviser or an affiliate pays certain expenses of managing and operating the fund out of each class's management fee.
Summary of Change Legend [Text Block]	This is a summary of certain changes to the Fund since December 1, 2023. For more complete information, you may review the Fund's next prospectus, which we expect to be available by January 29, 2025 at fundresearch.fidelity.com/prospectus/sec or upon request at 1-800-544-8544 or by sending an e-mail to fidfunddocuments fidelity.com .
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 Email Address	fidfunddocuments@fidelity.com</span>" id="sjs-B41"><span style="font-family:'Fidelity Sans';font-size:11px;color:#000000;font-style:normal;font-weight:normal;">fidfunddocuments@fidelity.com</span>
Updated Prospectus Web Address	fundresearch.fidelity.com/prospectus/sec</span>" id="sjs-B42"><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

Shareholder Report, Line Graph (Details) - USD ($)

12 Months Ended

60 Months Ended

120 Months Ended

132 Months Ended

Nov. 30, 2024

Nov. 30, 2023

Nov. 30, 2022

Nov. 30, 2021

Nov. 30, 2020

Nov. 30, 2019

Nov. 30, 2018

Nov. 30, 2017

Nov. 30, 2016

Nov. 30, 2015

Nov. 30, 2014

C000174185_1_BBIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

33.89%

C000174185_1_BBIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

15.77%

C000174185_1_BBIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

13.35%

C000174185_LG_ClassMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Fidelity® Nasdaq Composite Index® Fund" id="sjs-E14">Fidelity® Nasdaq Composite Index® Fund

C000174185_ClassMember_AsOf_2014Member

Account Value [Line Items]

Account Value

$ 10,000

C000174185_ClassMember_AsOf_2015Member

Account Value [Line Items]

Account Value

$ 10,770

C000174185_ClassMember_AsOf_2016Member

Account Value [Line Items]

Account Value

$ 11,355

C000174185_ClassMember_AsOf_2017Member

Account Value [Line Items]

Account Value

$ 14,792

C000174185_ClassMember_AsOf_2018Member

Account Value [Line Items]

Account Value

$ 15,872

C000174185_ClassMember_AsOf_2019Member

Account Value [Line Items]

Account Value

$ 18,975

C000174185_ClassMember_AsOf_2020Member

Account Value [Line Items]

Account Value

$ 26,874

C000174185_ClassMember_AsOf_2021Member

Account Value [Line Items]

Account Value

$ 34,447

C000174185_ClassMember_AsOf_2022Member

Account Value [Line Items]

Account Value

$ 25,706

C000174185_ClassMember_AsOf_2023Member

Account Value [Line Items]

Account Value

$ 32,263

C000174185_ClassMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 43,874

C000174185_LG_1_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

Nasdaq Composite Index®" id="sjs-E50">Nasdaq Composite Index®

C000174185_1_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

10,000

C000174185_1_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

10,786

C000174185_1_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

11,382

C000174185_1_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

14,860

C000174185_1_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

16,012

C000174185_1_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

19,136

C000174185_1_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

27,185

C000174185_1_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

34,852

C000174185_1_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

25,934

C000174185_1_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

32,451

C000174185_1_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

44,150

$ 44,150

C000174185_LG_2_AdditionalIndexMember_11YRMember

Account Value [Line Items]

Line Graph and Table Measure Name

S&P 500® Index" id="sjs-E86">S&P 500® Index

C000174185_2_AdditionalIndexMember_AsOf_2014Member

Account Value [Line Items]

Account Value

$ 10,000

C000174185_2_AdditionalIndexMember_AsOf_2015Member

Account Value [Line Items]

Account Value

$ 10,275

C000174185_2_AdditionalIndexMember_AsOf_2016Member

Account Value [Line Items]

Account Value

$ 11,103

C000174185_2_AdditionalIndexMember_AsOf_2017Member

Account Value [Line Items]

Account Value

$ 13,642

C000174185_2_AdditionalIndexMember_AsOf_2018Member

Account Value [Line Items]

Account Value

$ 14,498

C000174185_2_AdditionalIndexMember_AsOf_2019Member

Account Value [Line Items]

Account Value

$ 16,834

C000174185_2_AdditionalIndexMember_AsOf_2020Member

Account Value [Line Items]

Account Value

$ 19,773

C000174185_2_AdditionalIndexMember_AsOf_2021Member

Account Value [Line Items]

Account Value

$ 25,294

C000174185_2_AdditionalIndexMember_AsOf_2022Member

Account Value [Line Items]

Account Value

$ 22,964

C000174185_2_AdditionalIndexMember_AsOf_2023Member

Account Value [Line Items]

Account Value

$ 26,142

C000174185_2_AdditionalIndexMember_AsOf_2024Member

Account Value [Line Items]

Account Value

$ 35,002

C000174185_NoLoadClassMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

35.99%

C000174185_NoLoadClassMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

18.25%

C000174185_NoLoadClassMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

15.94%

C000174185_0_AdditionalIndexMember_1YRMember

Account Value [Line Items]

Average Annual Return, Percent

36.05%

C000174185_0_AdditionalIndexMember_5YRMember

Account Value [Line Items]

Average Annual Return, Percent

18.20%

C000174185_0_AdditionalIndexMember_10YRMember

Account Value [Line Items]

Average Annual Return, Percent

16.01%

Shareholder Report, Holdings (D

Shareholder Report, Holdings (Details) - Fidelity Nasdaq Composite Index Fund	Nov. 30, 2024
TH0Member
Holdings [Line Items]
Percent of Net Asset Value	11.50%
TH1Member
Holdings [Line Items]
Percent of Net Asset Value	10.90%
TH2Member
Holdings [Line Items]
Percent of Net Asset Value	10.10%
TH3Member
Holdings [Line Items]
Percent of Net Asset Value	7%
TH4Member
Holdings [Line Items]
Percent of Net Asset Value	4%
TH5Member
Holdings [Line Items]
Percent of Net Asset Value	3.60%
TH6Member
Holdings [Line Items]
Percent of Net Asset Value	3.30%
TH7Member
Holdings [Line Items]
Percent of Net Asset Value	3%
TH8Member
Holdings [Line Items]
Percent of Net Asset Value	2.50%
TH9Member
Holdings [Line Items]
Percent of Net Asset Value	1.50%
MSFinancialsSectorMember
Holdings [Line Items]
Percent of Net Asset Value	4.10%
Information Technology Member
Holdings [Line Items]
Percent of Net Asset Value	49.20%
Healthcare Sector
Holdings [Line Items]
Percent of Net Asset Value	6%
Real Estate Sector
Holdings [Line Items]
Percent of Net Asset Value	1%
Industrial Sector Member
Holdings [Line Items]
Percent of Net Asset Value	4.40%
Materials Sector Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Consumer Discretionary Sector Member
Holdings [Line Items]
Percent of Net Asset Value	14.90%
Consumer Staples Sector Member
Holdings [Line Items]
Percent of Net Asset Value	3.50%
Communications Sector Member
Holdings [Line Items]
Percent of Net Asset Value	14.30%
Energy Sector
Holdings [Line Items]
Percent of Net Asset Value	0.60%
Utilities Sector Member
Holdings [Line Items]
Percent of Net Asset Value	0.90%
United States
Holdings [Line Items]
Percent of Net Asset Value	97.20%
China
Holdings [Line Items]
Percent of Net Asset Value	0.90%
Brazil
Holdings [Line Items]
Percent of Net Asset Value	0.50%
Israel
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Netherlands
Holdings [Line Items]
Percent of Net Asset Value	0.30%
United Kingdom
Holdings [Line Items]
Percent of Net Asset Value	0.30%
Canada
Holdings [Line Items]
Percent of Net Asset Value	0.20%
Kazakhstan
Holdings [Line Items]
Percent of Net Asset Value	0.10%
Singapore
Holdings [Line Items]
Percent of Net Asset Value	0.10%
OtherMember
Holdings [Line Items]
Percent of Net Asset Value	0.10%
AACommonStocksMember
Holdings [Line Items]
Percent of Net Asset Value	99.80%
AAPreferredStocksMember
Holdings [Line Items]
Percent of Net Asset Value	0%
AAShortTermInvestmentsandNetOtherAssetsLiabilitiesMember
Holdings [Line Items]
Percent of Net Asset Value	0.20%