| Shareholder Report | 6 Months Ended |
| Jun. 30, 2024 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, 2024 |
| C000007773 | |
| Shareholder Report [Line Items] | |
| Fund Name | 500 Index Fund |
| Class Name | Investor Shares |
| Trading Symbol | VFINX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard 500 Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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 $7 0.14% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 7 |
| Expense Ratio, Percent | 0.14% |
| AssetsNet | $ 1,179,313,000,000 |
| Holdings Count | Holding | 514 |
| InvestmentCompanyPortfolioTurnover | 1% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $1,179,313 Number of Portfolio Holdings 514 Portfolio Turnover Rate 1% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Communication Services 9.3% Consumer Discretionary 9.9% Consumer Staples 5.8% Energy 3.6% Financials 12.4% Health Care 11.7% Industrials 8.1% Information Technology 32.4% Materials 2.2% Real Estate 2.2% Utilities 2.3% Other Assets and Liabilities—Net 0.1% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000092055 | |
| Shareholder Report [Line Items] | |
| Fund Name | 500 Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VOO |
| Security Exchange Name | CBOE |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard 500 Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.03% |
| AssetsNet | $ 1,179,313,000,000 |
| Holdings Count | Holding | 514 |
| InvestmentCompanyPortfolioTurnover | 1% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $1,179,313 Number of Portfolio Holdings 514 Portfolio Turnover Rate 1% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Communication Services 9.3% Consumer Discretionary 9.9% Consumer Staples 5.8% Energy 3.6% Financials 12.4% Health Care 11.7% Industrials 8.1% Information Technology 32.4% Materials 2.2% Real Estate 2.2% Utilities 2.3% Other Assets and Liabilities—Net 0.1% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007774 | |
| Shareholder Report [Line Items] | |
| Fund Name | 500 Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VFIAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard 500 Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.04% |
| AssetsNet | $ 1,179,313,000,000 |
| Holdings Count | Holding | 514 |
| InvestmentCompanyPortfolioTurnover | 1% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $1,179,313 Number of Portfolio Holdings 514 Portfolio Turnover Rate 1% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Communication Services 9.3% Consumer Discretionary 9.9% Consumer Staples 5.8% Energy 3.6% Financials 12.4% Health Care 11.7% Industrials 8.1% Information Technology 32.4% Materials 2.2% Real Estate 2.2% Utilities 2.3% Other Assets and Liabilities—Net 0.1% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000170274 | |
| Shareholder Report [Line Items] | |
| Fund Name | 500 Index Fund |
| Class Name | Institutional Select Share Class |
| Trading Symbol | VFFSX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard 500 Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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 Share Class $1 0.01% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 1 |
| Expense Ratio, Percent | 0.01% |
| AssetsNet | $ 1,179,313,000,000 |
| Holdings Count | Holding | 514 |
| InvestmentCompanyPortfolioTurnover | 1% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $1,179,313 Number of Portfolio Holdings 514 Portfolio Turnover Rate 1% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Communication Services 9.3% Consumer Discretionary 9.9% Consumer Staples 5.8% Energy 3.6% Financials 12.4% Health Care 11.7% Industrials 8.1% Information Technology 32.4% Materials 2.2% Real Estate 2.2% Utilities 2.3% Other Assets and Liabilities—Net 0.1% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007783 | |
| Shareholder Report [Line Items] | |
| Fund Name | Growth Index Fund |
| Class Name | Investor Shares |
| Trading Symbol | VIGRX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Growth Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 9 |
| Expense Ratio, Percent | 0.17% |
| AssetsNet | $ 251,642,000,000 |
| Holdings Count | Holding | 193 |
| InvestmentCompanyPortfolioTurnover | 3% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $251,642 Number of Portfolio Holdings 193 Portfolio Turnover Rate 3% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.3% Consumer Discretionary 16.6% Consumer Staples 0.6% Energy 1.0% Financials 2.4% Health Care 7.1% Industrials 7.7% Real Estate 1.3% Technology 60.8% Telecommunications 0.9% Utilities 0.2% Other Assets and Liabilities—Net 0.1% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007786 | |
| Shareholder Report [Line Items] | |
| Fund Name | Growth Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VUG |
| Security Exchange Name | NYSE |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Growth Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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 0.04% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.04% |
| AssetsNet | $ 251,642,000,000 |
| Holdings Count | Holding | 193 |
| InvestmentCompanyPortfolioTurnover | 3% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $251,642 Number of Portfolio Holdings 193 Portfolio Turnover Rate 3% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.3% Consumer Discretionary 16.6% Consumer Staples 0.6% Energy 1.0% Financials 2.4% Health Care 7.1% Industrials 7.7% Real Estate 1.3% Technology 60.8% Telecommunications 0.9% Utilities 0.2% Other Assets and Liabilities—Net 0.1% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007784 | |
| Shareholder Report [Line Items] | |
| Fund Name | Growth Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VIGAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Growth Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| AssetsNet | $ 251,642,000,000 |
| Holdings Count | Holding | 193 |
| InvestmentCompanyPortfolioTurnover | 3% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $251,642 Number of Portfolio Holdings 193 Portfolio Turnover Rate 3% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.3% Consumer Discretionary 16.6% Consumer Staples 0.6% Energy 1.0% Financials 2.4% Health Care 7.1% Industrials 7.7% Real Estate 1.3% Technology 60.8% Telecommunications 0.9% Utilities 0.2% Other Assets and Liabilities—Net 0.1% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007785 | |
| Shareholder Report [Line Items] | |
| Fund Name | Growth Index Fund |
| Class Name | Institutional Shares |
| Trading Symbol | VIGIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Growth Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.04% |
| AssetsNet | $ 251,642,000,000 |
| Holdings Count | Holding | 193 |
| InvestmentCompanyPortfolioTurnover | 3% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $251,642 Number of Portfolio Holdings 193 Portfolio Turnover Rate 3% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.3% Consumer Discretionary 16.6% Consumer Staples 0.6% Energy 1.0% Financials 2.4% Health Care 7.1% Industrials 7.7% Real Estate 1.3% Technology 60.8% Telecommunications 0.9% Utilities 0.2% Other Assets and Liabilities—Net 0.1% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007775 | |
| Shareholder Report [Line Items] | |
| Fund Name | Value Index Fund |
| Class Name | Investor Shares |
| Trading Symbol | VIVAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Value Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 9 |
| Expense Ratio, Percent | 0.17% |
| AssetsNet | $ 168,534,000,000 |
| Holdings Count | Holding | 350 |
| InvestmentCompanyPortfolioTurnover | 5% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $168,534 Number of Portfolio Holdings 350 Portfolio Turnover Rate 5% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.6% Consumer Discretionary 7.5% Consumer Staples 9.1% Energy 7.2% Financials 19.7% Health Care 16.8% Industrials 15.3% Real Estate 3.1% Technology 10.7% Telecommunications 3.3% Utilities 5.4% Other Assets and Liabilities—Net 0.3% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007778 | |
| Shareholder Report [Line Items] | |
| Fund Name | Value Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VTV |
| Security Exchange Name | NYSE |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Value Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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 0.04% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.04% |
| AssetsNet | $ 168,534,000,000 |
| Holdings Count | Holding | 350 |
| InvestmentCompanyPortfolioTurnover | 5% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $168,534 Number of Portfolio Holdings 350 Portfolio Turnover Rate 5% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.6% Consumer Discretionary 7.5% Consumer Staples 9.1% Energy 7.2% Financials 19.7% Health Care 16.8% Industrials 15.3% Real Estate 3.1% Technology 10.7% Telecommunications 3.3% Utilities 5.4% Other Assets and Liabilities—Net 0.3% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007776 | |
| Shareholder Report [Line Items] | |
| Fund Name | Value Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VVIAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Value Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| AssetsNet | $ 168,534,000,000 |
| Holdings Count | Holding | 350 |
| InvestmentCompanyPortfolioTurnover | 5% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $168,534 Number of Portfolio Holdings 350 Portfolio Turnover Rate 5% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.6% Consumer Discretionary 7.5% Consumer Staples 9.1% Energy 7.2% Financials 19.7% Health Care 16.8% Industrials 15.3% Real Estate 3.1% Technology 10.7% Telecommunications 3.3% Utilities 5.4% Other Assets and Liabilities—Net 0.3% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007777 | |
| Shareholder Report [Line Items] | |
| Fund Name | Value Index Fund |
| Class Name | Institutional Shares |
| Trading Symbol | VIVIX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Value Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.04% |
| AssetsNet | $ 168,534,000,000 |
| Holdings Count | Holding | 350 |
| InvestmentCompanyPortfolioTurnover | 5% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $168,534 Number of Portfolio Holdings 350 Portfolio Turnover Rate 5% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.6% Consumer Discretionary 7.5% Consumer Staples 9.1% Energy 7.2% Financials 19.7% Health Care 16.8% Industrials 15.3% Real Estate 3.1% Technology 10.7% Telecommunications 3.3% Utilities 5.4% Other Assets and Liabilities—Net 0.3% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007787 | |
| Shareholder Report [Line Items] | |
| Fund Name | Large-Cap Index Fund |
| Class Name | Investor Shares |
| Trading Symbol | VLACX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Large-Cap Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 9 |
| Expense Ratio, Percent | 0.17% |
| AssetsNet | $ 52,690,000,000 |
| Holdings Count | Holding | 506 |
| InvestmentCompanyPortfolioTurnover | 1% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $52,690 Number of Portfolio Holdings 506 Portfolio Turnover Rate 1% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.4% Consumer Discretionary 13.5% Consumer Staples 4.4% Energy 3.7% Financials 10.0% Health Care 11.3% Industrials 10.8% Real Estate 2.1% Technology 38.1% Telecommunications 1.9% Utilities 2.5% Other Assets and Liabilities—Net 0.3% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007790 | |
| Shareholder Report [Line Items] | |
| Fund Name | Large-Cap Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VV |
| Security Exchange Name | NYSE |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Large-Cap Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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 0.04% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.04% |
| AssetsNet | $ 52,690,000,000 |
| Holdings Count | Holding | 506 |
| InvestmentCompanyPortfolioTurnover | 1% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $52,690 Number of Portfolio Holdings 506 Portfolio Turnover Rate 1% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.4% Consumer Discretionary 13.5% Consumer Staples 4.4% Energy 3.7% Financials 10.0% Health Care 11.3% Industrials 10.8% Real Estate 2.1% Technology 38.1% Telecommunications 1.9% Utilities 2.5% Other Assets and Liabilities—Net 0.3% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007788 | |
| Shareholder Report [Line Items] | |
| Fund Name | Large-Cap Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VLCAX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Large-Cap Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.05% |
| AssetsNet | $ 52,690,000,000 |
| Holdings Count | Holding | 506 |
| InvestmentCompanyPortfolioTurnover | 1% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $52,690 Number of Portfolio Holdings 506 Portfolio Turnover Rate 1% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.4% Consumer Discretionary 13.5% Consumer Staples 4.4% Energy 3.7% Financials 10.0% Health Care 11.3% Industrials 10.8% Real Estate 2.1% Technology 38.1% Telecommunications 1.9% Utilities 2.5% Other Assets and Liabilities—Net 0.3% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
| C000007789 | |
| Shareholder Report [Line Items] | |
| Fund Name | Large-Cap Index Fund |
| Class Name | Institutional Shares |
| Trading Symbol | VLISX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about Vanguard Large-Cap Index Fund (the "Fund") for the period of January 1, 2024, to June 30, 2024. |
| 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. |
| 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% Footnote Reference Footnote Description Footnote 1 Annualized. |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.04% |
| AssetsNet | $ 52,690,000,000 |
| Holdings Count | Holding | 506 |
| InvestmentCompanyPortfolioTurnover | 1% |
| Additional Fund Statistics [Text Block] | Fund Statistics (as of June 30, 2024) Fund Net Assets (in millions) $52,690 Number of Portfolio Holdings 506 Portfolio Turnover Rate 1% |
| Holdings [Text Block] | This table reflects the Fund's investments, including short-term investments, derivatives and other assets and liabilities. Portfolio Composition % of Net Assets (as of June 30, 2024) Basic Materials 1.4% Consumer Discretionary 13.5% Consumer Staples 4.4% Energy 3.7% Financials 10.0% Health Care 11.3% Industrials 10.8% Real Estate 2.1% Technology 38.1% Telecommunications 1.9% Utilities 2.5% Other Assets and Liabilities—Net 0.3% |
| Material Fund Change [Text Block] | |
| Updated Prospectus Web Address | https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature |
