v3.26.1
Shareholder Report
 6 Months Ended
Jun. 30, 2026
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name Vanguard Index Funds
Entity Central Index Key 0000036405
Entity Investment Company Type N-1A
Document Period End Date Jun. 30, 2026
C000096110 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Extended Market Index Fund
Class Name Institutional Plus Shares
Trading Symbol VEMPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Extended Market Index Fund (the "Fund") for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Plus Shares $2 0.036%1
​1
Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.036% [1]
Net Assets $ 97,661,000,000
Holdings Count | Holding 3,383
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $97,661
Number of Portfolio Holdings 3,383
Portfolio Turnover Rate 7%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Communication Services 4.5%
Consumer Discretionary 9.3%
Consumer Staples 2.4%
Energy 4.2%
Financials 14.8%
Health Care 14.0%
Industrials 21.2%
Information Technology 18.5%
Materials 4.1%
Real Estate 5.1%
Utilities 1.9%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Capital Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007781 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Extended Market Index Fund
Class Name Institutional Shares
Trading Symbol VIEIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Extended Market Index Fund (the "Fund") for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares $2 0.04%1
​1
Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [2]
Net Assets $ 97,661,000,000
Holdings Count | Holding 3,383
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $97,661
Number of Portfolio Holdings 3,383
Portfolio Turnover Rate 7%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Communication Services 4.5%
Consumer Discretionary 9.3%
Consumer Staples 2.4%
Energy 4.2%
Financials 14.8%
Health Care 14.0%
Industrials 21.2%
Information Technology 18.5%
Materials 4.1%
Real Estate 5.1%
Utilities 1.9%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Capital Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007780 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Extended Market Index Fund
Class Name Admiral™ Shares
Trading Symbol VEXAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Extended Market Index Fund (the "Fund") for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Admiral Shares $3 0.05%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [3]
Net Assets $ 97,661,000,000
Holdings Count | Holding 3,383
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $97,661
Number of Portfolio Holdings 3,383
Portfolio Turnover Rate 7%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Communication Services 4.5%
Consumer Discretionary 9.3%
Consumer Staples 2.4%
Energy 4.2%
Financials 14.8%
Health Care 14.0%
Industrials 21.2%
Information Technology 18.5%
Materials 4.1%
Real Estate 5.1%
Utilities 1.9%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Capital Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007782 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Extended Market Index Fund
Class Name ETF Shares
Trading Symbol VXF
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Extended Market Index Fund (the "Fund") for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
ETF Shares $3 0.05%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [4]
Net Assets $ 97,661,000,000
Holdings Count | Holding 3,383
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $97,661
Number of Portfolio Holdings 3,383
Portfolio Turnover Rate 7%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Communication Services 4.5%
Consumer Discretionary 9.3%
Consumer Staples 2.4%
Energy 4.2%
Financials 14.8%
Health Care 14.0%
Industrials 21.2%
Information Technology 18.5%
Materials 4.1%
Real Estate 5.1%
Utilities 1.9%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Capital Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007779 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Extended Market Index Fund
Class Name Investor Shares
Trading Symbol VEXMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Extended Market Index Fund (the "Fund") for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Investor Shares $10 0.19%1
​1
Annualized.
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.19% [5]
Net Assets $ 97,661,000,000
Holdings Count | Holding 3,383
Investment Company Portfolio Turnover 7.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $97,661
Number of Portfolio Holdings 3,383
Portfolio Turnover Rate 7%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Communication Services 4.5%
Consumer Discretionary 9.3%
Consumer Staples 2.4%
Energy 4.2%
Financials 14.8%
Health Care 14.0%
Industrials 21.2%
Information Technology 18.5%
Materials 4.1%
Real Estate 5.1%
Utilities 1.9%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Capital Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007791 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Mid-Cap Index Fund
Class Name Investor Shares
Trading Symbol VIMSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Mid-Cap Index Fund (the "Fund") (formerly known as Vanguard Mid-Cap Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Investor Shares $9 0.17%1
​1
Annualized.
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.17% [6]
Net Assets $ 224,020,000,000
Holdings Count | Holding 300
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $224,020
Number of Portfolio Holdings 300
Portfolio Turnover Rate 12%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 2.2%
Consumer Discretionary 13.5%
Consumer Staples 4.9%
Energy 7.4%
Financials 12.6%
Health Care 6.5%
Industrials 21.2%
Real Estate 5.1%
Technology 15.1%
Telecommunications 2.2%
Utilities 9.0%
Other Assets and Liabilities—Net 0.3%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007794 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Mid-Cap Index Fund
Class Name ETF Shares
Trading Symbol VO
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Mid-Cap Index Fund (the "Fund") (formerly known as Vanguard Mid-Cap Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
ETF Shares $2 0.03%1
​1
Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.03% [7]
Net Assets $ 224,020,000,000
Holdings Count | Holding 300
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $224,020
Number of Portfolio Holdings 300
Portfolio Turnover Rate 12%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 2.2%
Consumer Discretionary 13.5%
Consumer Staples 4.9%
Energy 7.4%
Financials 12.6%
Health Care 6.5%
Industrials 21.2%
Real Estate 5.1%
Technology 15.1%
Telecommunications 2.2%
Utilities 9.0%
Other Assets and Liabilities—Net 0.3%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007792 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Mid-Cap Index Fund
Class Name Admiral™ Shares
Trading Symbol VIMAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Mid-Cap Index Fund (the "Fund") (formerly known as Vanguard Mid-Cap Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Admiral Shares $3 0.05%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [8]
Net Assets $ 224,020,000,000
Holdings Count | Holding 300
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $224,020
Number of Portfolio Holdings 300
Portfolio Turnover Rate 12%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 2.2%
Consumer Discretionary 13.5%
Consumer Staples 4.9%
Energy 7.4%
Financials 12.6%
Health Care 6.5%
Industrials 21.2%
Real Estate 5.1%
Technology 15.1%
Telecommunications 2.2%
Utilities 9.0%
Other Assets and Liabilities—Net 0.3%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007793 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Mid-Cap Index Fund
Class Name Institutional Shares
Trading Symbol VMCIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Mid-Cap Index Fund (the "Fund") (formerly known as Vanguard Mid-Cap Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares $2 0.03%1
​1
Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.03% [9]
Net Assets $ 224,020,000,000
Holdings Count | Holding 300
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $224,020
Number of Portfolio Holdings 300
Portfolio Turnover Rate 12%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 2.2%
Consumer Discretionary 13.5%
Consumer Staples 4.9%
Energy 7.4%
Financials 12.6%
Health Care 6.5%
Industrials 21.2%
Real Estate 5.1%
Technology 15.1%
Telecommunications 2.2%
Utilities 9.0%
Other Assets and Liabilities—Net 0.3%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000096111 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Mid-Cap Index Fund
Class Name Institutional Plus Shares
Trading Symbol VMCPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Mid-Cap Index Fund (the "Fund") (formerly known as Vanguard Mid-Cap Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Plus Shares $1 0.02%1
​1
Annualized.
Expenses Paid, Amount $ 1
Expense Ratio, Percent 0.02% [10]
Net Assets $ 224,020,000,000
Holdings Count | Holding 300
Investment Company Portfolio Turnover 12.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $224,020
Number of Portfolio Holdings 300
Portfolio Turnover Rate 12%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 2.2%
Consumer Discretionary 13.5%
Consumer Staples 4.9%
Energy 7.4%
Financials 12.6%
Health Care 6.5%
Industrials 21.2%
Real Estate 5.1%
Technology 15.1%
Telecommunications 2.2%
Utilities 9.0%
Other Assets and Liabilities—Net 0.3%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000096112 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Index Fund
Class Name Institutional Plus Shares
Trading Symbol VSCPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Plus Shares $1 0.02%1
​1
Annualized.
Expenses Paid, Amount $ 1
Expense Ratio, Percent 0.02% [11]
Net Assets $ 188,249,000,000
Holdings Count | Holding 1,316
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $188,249
Number of Portfolio Holdings 1,316
Portfolio Turnover Rate 11%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 4.7%
Consumer Discretionary 12.8%
Consumer Staples 3.1%
Energy 4.4%
Financials 12.3%
Health Care 12.3%
Industrials 22.6%
Real Estate 7.4%
Technology 15.3%
Telecommunications 1.5%
Utilities 3.6%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007797 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Index Fund
Class Name Institutional Shares
Trading Symbol VSCIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares $2 0.03%1
​1
Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.03% [12]
Net Assets $ 188,249,000,000
Holdings Count | Holding 1,316
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $188,249
Number of Portfolio Holdings 1,316
Portfolio Turnover Rate 11%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 4.7%
Consumer Discretionary 12.8%
Consumer Staples 3.1%
Energy 4.4%
Financials 12.3%
Health Care 12.3%
Industrials 22.6%
Real Estate 7.4%
Technology 15.3%
Telecommunications 1.5%
Utilities 3.6%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007796 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Index Fund
Class Name Admiral™ Shares
Trading Symbol VSMAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Admiral Shares $3 0.05%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [13]
Net Assets $ 188,249,000,000
Holdings Count | Holding 1,316
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $188,249
Number of Portfolio Holdings 1,316
Portfolio Turnover Rate 11%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 4.7%
Consumer Discretionary 12.8%
Consumer Staples 3.1%
Energy 4.4%
Financials 12.3%
Health Care 12.3%
Industrials 22.6%
Real Estate 7.4%
Technology 15.3%
Telecommunications 1.5%
Utilities 3.6%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007798 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Index Fund
Class Name ETF Shares
Trading Symbol VB
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
ETF Shares $2 0.03%1
​1
Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.03% [14]
Net Assets $ 188,249,000,000
Holdings Count | Holding 1,316
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $188,249
Number of Portfolio Holdings 1,316
Portfolio Turnover Rate 11%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 4.7%
Consumer Discretionary 12.8%
Consumer Staples 3.1%
Energy 4.4%
Financials 12.3%
Health Care 12.3%
Industrials 22.6%
Real Estate 7.4%
Technology 15.3%
Telecommunications 1.5%
Utilities 3.6%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007795 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Index Fund
Class Name Investor Shares
Trading Symbol NAESX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Investor Shares $9 0.17%1
​1
Annualized.
Expenses Paid, Amount $ 9
Expense Ratio, Percent 0.17% [15]
Net Assets $ 188,249,000,000
Holdings Count | Holding 1,316
Investment Company Portfolio Turnover 11.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $188,249
Number of Portfolio Holdings 1,316
Portfolio Turnover Rate 11%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 4.7%
Consumer Discretionary 12.8%
Consumer Staples 3.1%
Energy 4.4%
Financials 12.3%
Health Care 12.3%
Industrials 22.6%
Real Estate 7.4%
Technology 15.3%
Telecommunications 1.5%
Utilities 3.6%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007799 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Growth Index Fund
Class Name Investor Shares
Trading Symbol VISGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Growth Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Growth Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Investor Shares $10 0.19%1
​1
Annualized.
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.19% [16]
Net Assets $ 47,007,000,000
Holdings Count | Holding 551
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $47,007
Number of Portfolio Holdings 551
Portfolio Turnover Rate 18%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 4.4%
Consumer Discretionary 10.4%
Consumer Staples 2.3%
Energy 4.3%
Financials 4.7%
Health Care 17.7%
Industrials 24.4%
Real Estate 3.8%
Technology 24.1%
Telecommunications 2.3%
Utilities 1.6%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007801 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Growth Index Fund
Class Name ETF Shares
Trading Symbol VBK
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Growth Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Growth Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
ETF Shares $3 0.05%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [17]
Net Assets $ 47,007,000,000
Holdings Count | Holding 551
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $47,007
Number of Portfolio Holdings 551
Portfolio Turnover Rate 18%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 4.4%
Consumer Discretionary 10.4%
Consumer Staples 2.3%
Energy 4.3%
Financials 4.7%
Health Care 17.7%
Industrials 24.4%
Real Estate 3.8%
Technology 24.1%
Telecommunications 2.3%
Utilities 1.6%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000105304 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Growth Index Fund
Class Name Admiral™ Shares
Trading Symbol VSGAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Growth Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Growth Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Admiral Shares $4 0.07%1
​1
Annualized.
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.07% [18]
Net Assets $ 47,007,000,000
Holdings Count | Holding 551
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $47,007
Number of Portfolio Holdings 551
Portfolio Turnover Rate 18%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 4.4%
Consumer Discretionary 10.4%
Consumer Staples 2.3%
Energy 4.3%
Financials 4.7%
Health Care 17.7%
Industrials 24.4%
Real Estate 3.8%
Technology 24.1%
Telecommunications 2.3%
Utilities 1.6%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007800 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Growth Index Fund
Class Name Institutional Shares
Trading Symbol VSGIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Growth Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Growth Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares $3 0.05%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [19]
Net Assets $ 47,007,000,000
Holdings Count | Holding 551
Investment Company Portfolio Turnover 18.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $47,007
Number of Portfolio Holdings 551
Portfolio Turnover Rate 18%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 4.4%
Consumer Discretionary 10.4%
Consumer Staples 2.3%
Energy 4.3%
Financials 4.7%
Health Care 17.7%
Industrials 24.4%
Real Estate 3.8%
Technology 24.1%
Telecommunications 2.3%
Utilities 1.6%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007803 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Value Index Fund
Class Name Institutional Shares
Trading Symbol VSIIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Value Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Value Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares $3 0.05%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [20]
Net Assets $ 67,797,000,000
Holdings Count | Holding 844
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $67,797
Number of Portfolio Holdings 844
Portfolio Turnover Rate 13%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 5.0%
Consumer Discretionary 14.6%
Consumer Staples 3.7%
Energy 4.5%
Financials 18.1%
Health Care 8.3%
Industrials 21.3%
Real Estate 10.1%
Technology 8.5%
Telecommunications 0.8%
Utilities 5.1%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000105305 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Value Index Fund
Class Name Admiral™ Shares
Trading Symbol VSIAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Value Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Value Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Admiral Shares $4 0.07%1
​1
Annualized.
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.07% [21]
Net Assets $ 67,797,000,000
Holdings Count | Holding 844
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $67,797
Number of Portfolio Holdings 844
Portfolio Turnover Rate 13%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 5.0%
Consumer Discretionary 14.6%
Consumer Staples 3.7%
Energy 4.5%
Financials 18.1%
Health Care 8.3%
Industrials 21.3%
Real Estate 10.1%
Technology 8.5%
Telecommunications 0.8%
Utilities 5.1%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007804 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Value Index Fund
Class Name ETF Shares
Trading Symbol VBR
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Value Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Value Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
ETF Shares $3 0.05%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [22]
Net Assets $ 67,797,000,000
Holdings Count | Holding 844
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $67,797
Number of Portfolio Holdings 844
Portfolio Turnover Rate 13%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 5.0%
Consumer Discretionary 14.6%
Consumer Staples 3.7%
Energy 4.5%
Financials 18.1%
Health Care 8.3%
Industrials 21.3%
Real Estate 10.1%
Technology 8.5%
Telecommunications 0.8%
Utilities 5.1%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007802 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Small-Cap Value Index Fund
Class Name Investor Shares
Trading Symbol VISVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Small-Cap Value Index Fund (the "Fund") (formerly known as Vanguard Small-Cap Value Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Investor Shares $10 0.19%1
​1
Annualized.
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.19% [23]
Net Assets $ 67,797,000,000
Holdings Count | Holding 844
Investment Company Portfolio Turnover 13.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $67,797
Number of Portfolio Holdings 844
Portfolio Turnover Rate 13%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 5.0%
Consumer Discretionary 14.6%
Consumer Staples 3.7%
Energy 4.5%
Financials 18.1%
Health Care 8.3%
Industrials 21.3%
Real Estate 10.1%
Technology 8.5%
Telecommunications 0.8%
Utilities 5.1%
Other Assets and Liabilities—Net 0.0%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007805 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Total Stock Market Index Fund
Class Name Investor Shares
Trading Symbol VTSMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Total Stock Market Index Fund (the "Fund") (formerly known as Vanguard Total Stock Market Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Investor Shares $4 0.07%1
​1
Annualized.
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.07% [24]
Net Assets $ 2,298,312,000,000
Holdings Count | Holding 3,543
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $2,298,312
Number of Portfolio Holdings 3,543
Portfolio Turnover Rate 2%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 1.6%
Consumer Discretionary 12.3%
Consumer Staples 3.4%
Energy 3.2%
Financials 9.9%
Health Care 9.1%
Industrials 12.5%
Real Estate 2.2%
Technology 41.0%
Telecommunications 2.1%
Utilities 2.5%
Other Assets and Liabilities—Net 0.2%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Capital Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007808 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Total Stock Market Index Fund
Class Name ETF Shares
Trading Symbol VTI
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Total Stock Market Index Fund (the "Fund") (formerly known as Vanguard Total Stock Market Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
ETF Shares $2 0.03%1
​1
Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.03% [25]
Net Assets $ 2,298,312,000,000
Holdings Count | Holding 3,543
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $2,298,312
Number of Portfolio Holdings 3,543
Portfolio Turnover Rate 2%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 1.6%
Consumer Discretionary 12.3%
Consumer Staples 3.4%
Energy 3.2%
Financials 9.9%
Health Care 9.1%
Industrials 12.5%
Real Estate 2.2%
Technology 41.0%
Telecommunications 2.1%
Utilities 2.5%
Other Assets and Liabilities—Net 0.2%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Capital Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007806 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Total Stock Market Index Fund
Class Name Admiral™ Shares
Trading Symbol VTSAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Total Stock Market Index Fund (the "Fund") (formerly known as Vanguard Total Stock Market Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Admiral Shares $2 0.04%1
​1
Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.04% [26]
Net Assets $ 2,298,312,000,000
Holdings Count | Holding 3,543
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $2,298,312
Number of Portfolio Holdings 3,543
Portfolio Turnover Rate 2%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 1.6%
Consumer Discretionary 12.3%
Consumer Staples 3.4%
Energy 3.2%
Financials 9.9%
Health Care 9.1%
Industrials 12.5%
Real Estate 2.2%
Technology 41.0%
Telecommunications 2.1%
Utilities 2.5%
Other Assets and Liabilities—Net 0.2%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Capital Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000007807 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Total Stock Market Index Fund
Class Name Institutional Shares
Trading Symbol VITSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Total Stock Market Index Fund (the "Fund") (formerly known as Vanguard Total Stock Market Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Shares $2 0.03%1
​1
Annualized.
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.03% [27]
Net Assets $ 2,298,312,000,000
Holdings Count | Holding 3,543
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $2,298,312
Number of Portfolio Holdings 3,543
Portfolio Turnover Rate 2%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 1.6%
Consumer Discretionary 12.3%
Consumer Staples 3.4%
Energy 3.2%
Financials 9.9%
Health Care 9.1%
Industrials 12.5%
Real Estate 2.2%
Technology 41.0%
Telecommunications 2.1%
Utilities 2.5%
Other Assets and Liabilities—Net 0.2%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Capital Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000155407 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Total Stock Market Index Fund
Class Name Institutional Plus Shares
Trading Symbol VSMPX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Total Stock Market Index Fund (the "Fund") (formerly known as Vanguard Total Stock Market Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Plus Shares $1 0.02%1
​1
Annualized.
Expenses Paid, Amount $ 1
Expense Ratio, Percent 0.02% [28]
Net Assets $ 2,298,312,000,000
Holdings Count | Holding 3,543
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $2,298,312
Number of Portfolio Holdings 3,543
Portfolio Turnover Rate 2%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 1.6%
Consumer Discretionary 12.3%
Consumer Staples 3.4%
Energy 3.2%
Financials 9.9%
Health Care 9.1%
Industrials 12.5%
Real Estate 2.2%
Technology 41.0%
Telecommunications 2.1%
Utilities 2.5%
Other Assets and Liabilities—Net 0.2%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Capital Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000170276 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Total Stock Market Index Fund
Class Name Institutional Select Shares
Trading Symbol VSTSX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Total Stock Market Index Fund (the "Fund") (formerly known as Vanguard Total Stock Market Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Institutional Select Shares $1 0.01%1
​1
Annualized.
Expenses Paid, Amount $ 1
Expense Ratio, Percent 0.01% [29]
Net Assets $ 2,298,312,000,000
Holdings Count | Holding 3,543
Investment Company Portfolio Turnover 2.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $2,298,312
Number of Portfolio Holdings 3,543
Portfolio Turnover Rate 2%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 1.6%
Consumer Discretionary 12.3%
Consumer Staples 3.4%
Energy 3.2%
Financials 9.9%
Health Care 9.1%
Industrials 12.5%
Real Estate 2.2%
Technology 41.0%
Telecommunications 2.1%
Utilities 2.5%
Other Assets and Liabilities—Net 0.2%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Capital Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000105306 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Mid-Cap Growth Index Fund
Class Name Admiral™ Shares
Trading Symbol VMGMX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Mid-Cap Growth Index Fund (the "Fund") (formerly known as Vanguard Mid-Cap Growth Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Admiral Shares $4 0.07%1
​1
Annualized.
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.07% [30]
Net Assets $ 34,813,000,000
Holdings Count | Holding 126
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $34,813
Number of Portfolio Holdings 126
Portfolio Turnover Rate 19%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 1.2%
Consumer Discretionary 15.8%
Consumer Staples 0.5%
Energy 2.0%
Financials 6.2%
Health Care 8.0%
Industrials 25.8%
Real Estate 4.2%
Technology 27.0%
Telecommunications 4.8%
Utilities 4.4%
Other Assets and Liabilities—Net 0.1%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000034428 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Mid-Cap Growth Index Fund
Class Name ETF Shares
Trading Symbol VOT
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Mid-Cap Growth Index Fund (the "Fund") (formerly known as Vanguard Mid-Cap Growth Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
ETF Shares $3 0.05%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [31]
Net Assets $ 34,813,000,000
Holdings Count | Holding 126
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $34,813
Number of Portfolio Holdings 126
Portfolio Turnover Rate 19%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 1.2%
Consumer Discretionary 15.8%
Consumer Staples 0.5%
Energy 2.0%
Financials 6.2%
Health Care 8.0%
Industrials 25.8%
Real Estate 4.2%
Technology 27.0%
Telecommunications 4.8%
Utilities 4.4%
Other Assets and Liabilities—Net 0.1%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000034427 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Mid-Cap Growth Index Fund
Class Name Investor Shares
Trading Symbol VMGIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Mid-Cap Growth Index Fund (the "Fund") (formerly known as Vanguard Mid-Cap Growth Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Investor Shares $10 0.19%1
​1
Annualized.
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.19% [32]
Net Assets $ 34,813,000,000
Holdings Count | Holding 126
Investment Company Portfolio Turnover 19.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $34,813
Number of Portfolio Holdings 126
Portfolio Turnover Rate 19%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 1.2%
Consumer Discretionary 15.8%
Consumer Staples 0.5%
Energy 2.0%
Financials 6.2%
Health Care 8.0%
Industrials 25.8%
Real Estate 4.2%
Technology 27.0%
Telecommunications 4.8%
Utilities 4.4%
Other Assets and Liabilities—Net 0.1%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000034429 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Mid-Cap Value Index Fund
Class Name Investor Shares
Trading Symbol VMVIX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Mid-Cap Value Index Fund (the "Fund") (formerly known as Vanguard Mid-Cap Value Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Investor Shares $10 0.19%1
​1
Annualized.
Expenses Paid, Amount $ 10
Expense Ratio, Percent 0.19% [33]
Net Assets $ 37,236,000,000
Holdings Count | Holding 182
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $37,236
Number of Portfolio Holdings 182
Portfolio Turnover Rate 10%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 3.0%
Consumer Discretionary 11.6%
Consumer Staples 8.4%
Energy 11.7%
Financials 17.6%
Health Care 5.4%
Industrials 17.6%
Real Estate 5.7%
Technology 5.7%
Telecommunications 0.1%
Utilities 12.6%
Other Assets and Liabilities—Net 0.6%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000034430 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Mid-Cap Value Index Fund
Class Name ETF Shares
Trading Symbol VOE
Security Exchange Name NYSEArca
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Mid-Cap Value Index Fund (the "Fund") (formerly known as Vanguard Mid-Cap Value Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
ETF Shares $3 0.05%1
​1
Annualized.
Expenses Paid, Amount $ 3
Expense Ratio, Percent 0.05% [34]
Net Assets $ 37,236,000,000
Holdings Count | Holding 182
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $37,236
Number of Portfolio Holdings 182
Portfolio Turnover Rate 10%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 3.0%
Consumer Discretionary 11.6%
Consumer Staples 8.4%
Energy 11.7%
Financials 17.6%
Health Care 5.4%
Industrials 17.6%
Real Estate 5.7%
Technology 5.7%
Telecommunications 0.1%
Utilities 12.6%
Other Assets and Liabilities—Net 0.6%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
C000105307 [Member]  
Shareholder Report [Line Items]  
Fund Name Vanguard Morningstar Mid-Cap Value Index Fund
Class Name Admiral™ Shares
Trading Symbol VMVAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Vanguard Morningstar Mid-Cap Value Index Fund (the "Fund") (formerly known as Vanguard Mid-Cap Value Index Fund) for the period of January 1, 2026, to June 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature. You can also request this information by contacting us at 800-662-7447.
Material Fund Change Notice [Text Block] The report describes changes to the Fund that occurred during the reporting period.
Additional Information Phone Number 800-662-7447
Additional Information Website https://personal1.vanguard.com/ngf‑next‑gen‑form‑webapp/fund‑literature
Expenses [Text Block]
What were the Fund costs for the last six months?
(based on a hypothetical $10,000 investment)
Share Class Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment
Admiral Shares $4 0.07%1
​1
Annualized.
Expenses Paid, Amount $ 4
Expense Ratio, Percent 0.07% [35]
Net Assets $ 37,236,000,000
Holdings Count | Holding 182
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
Fund Statistics
(as of June 30, 2026)
Fund Net Assets
(in millions)		 $37,236
Number of Portfolio Holdings 182
Portfolio Turnover Rate 10%
Holdings [Text Block]
Portfolio Composition % of Net Assets
(as of June 30, 2026)
Basic Materials 3.0%
Consumer Discretionary 11.6%
Consumer Staples 8.4%
Energy 11.7%
Financials 17.6%
Health Care 5.4%
Industrials 17.6%
Real Estate 5.7%
Technology 5.7%
Telecommunications 0.1%
Utilities 12.6%
Other Assets and Liabilities—Net 0.6%
This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities.
Material Fund Change [Text Block]
How has the Fund changed?
Effective January 12, 2026, The Vanguard Group, Inc. exercises portfolio management responsibilities for the fund through its wholly-owned subsidiary, Vanguard Portfolio Management, LLC.
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Summary of Change Legend [Text Block]
This is a summary of certain changes to the Fund since December 31, 2025. For more complete information, you may review the Fund’s prospectus at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature or upon request at 800-662-7447.
Updated Prospectus Phone Number 800-662-7447
Updated Prospectus Web Address https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
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