Form N-CSR Cover
| Form N-CSR Cover | 12 Months Ended |
| Aug. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Vanguard Scottsdale Funds |
| Entity Central Index Key | 0001021882 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
Shareholder Report
| Shareholder Report | 12 Months Ended |
| Aug. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Vanguard Scottsdale Funds |
| Entity Central Index Key | 0001021882 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Aug. 31, 2024 |
| C000203194 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Total World Bond ETF |
| Class Name | ETF Shares |
| Trading Symbol | BNDW |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Total World Bond ETF (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.05 % |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Total World Bond ETF performed roughly in line with its expense-free benchmark index. Global economic growth appeared relatively stable, in the low 3% range, during the 12 months, and U.S. recession fears faded. Central banks in emerging economies and Europe lowered their interest rate targets, but the Federal Reserve held rates steady. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%, and the Bloomberg Global Aggregate Index ex USD of bonds returned 6.44%. Bonds from the United States, which accounted for more than half of the Fund’s assets at the end of the period, returned a little less than the index as a whole. Among the outperformers were South Korea, Canada, and Italy. Corporate bonds returned more than government bonds and mortgage-backed securities. Intermediate-term bonds and those on the bottom rung of the investment-grade ladder performed well. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform since inception? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: September 4, 2018, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years Since Inception ETF Shares Net Asset Value 7.17% -0.26% 1.54 % ETF Shares Market Price 7.21% -0.27% 1.54 % Bloomberg Global Aggregate Float Adjusted Composite Index 7.31% -0.21% 1.61% Bloomberg Global Aggregate Float Adjusted Index 7.34% -0.96% 0.52% |
| Performance Inception Date | Sep. 04, 2018 |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 804,000,000 |
| Holdings Count | Holding | 3 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 10% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 3 Portfolio Turnover Rate 10 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Portfolio Composition % of Net Assets Vanguard Total Bond Market ETF 51.3 % Vanguard Total International Bond ETF 48.7 % Other Assets and Liabilities—Net 0.0 % |
| C000080843 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Short-Term Treasury Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VGSH |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Short-Term Treasury Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.04 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.04% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, the Fund performed roughly in line with its expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. Yields of U.S. Treasuries fell across the maturity spectrum, with more movement at the shorter end of the yield curve. The broad U.S. investment-grade bond market returned 7.30%, as measured by the Bloomberg U.S. Aggregate Float Adjusted Index. The highest total returns for Treasuries tended to be in the intermediate-term maturities. In general, Treasuries returned less than mortgage-backed securities and corporate bonds. Over the last 10 years, the Fund performed roughly in line with its benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years ETF Shares Net Asset Value 5.88% 1.26% 1.27% ETF Shares Market Price 5.79% 1.26% 1.27% Spliced Bloomberg U.S. Treasury 1–3 Year Index 5.90% 1.30% 1.32% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 24,903,000,000 |
| Holdings Count | Holding | 98 |
| Advisory Fees Paid, Amount | $ 501,000 |
| Investment Company Portfolio Turnover | 89% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 98 Portfolio Turnover Rate 89 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 1 - 2 Years 55.8 % 2 - 3 Years 43.3 % Other Assets and Liabilities—Net 0.9 % |
| C000080841 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Short-Term Treasury Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VSBSX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Short-Term Treasury Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.07 % |
| Expenses Paid, Amount | $ 7 |
| Expense Ratio, Percent | 0.07% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, the Fund performed roughly in line with its expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. Yields of U.S. Treasuries fell across the maturity spectrum, with more movement at the shorter end of the yield curve. The broad U.S. investment-grade bond market returned 7.30%, as measured by the Bloomberg U.S. Aggregate Float Adjusted Index. The highest total returns for Treasuries tended to be in the intermediate-term maturities. In general, Treasuries returned less than mortgage-backed securities and corporate bonds. Over the last 10 years, the Fund performed roughly in line with its benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 5.81% 1.23% 1.25% Spliced Bloomberg U.S. Treasury 1–3 Year Index 5.90% 1.30% 1.32% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 24,903,000,000 |
| Holdings Count | Holding | 98 |
| Advisory Fees Paid, Amount | $ 501,000 |
| Investment Company Portfolio Turnover | 89% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 98 Portfolio Turnover Rate 89 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 1 - 2 Years 55.8 % 2 - 3 Years 43.3 % Other Assets and Liabilities—Net 0.9 % |
| C000080842 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Short-Term Treasury Index Fund |
| Class Name | Institutional Shares |
| Trading Symbol | VSBIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Short-Term Treasury Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.05 % |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, the Fund performed roughly in line with its expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. Yields of U.S. Treasuries fell across the maturity spectrum, with more movement at the shorter end of the yield curve. The broad U.S. investment-grade bond market returned 7.30%, as measured by the Bloomberg U.S. Aggregate Float Adjusted Index. The highest total returns for Treasuries tended to be in the intermediate-term maturities. In general, Treasuries returned less than mortgage-backed securities and corporate bonds. Over the last 10 years, the Fund performed roughly in line with its benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $5,000,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Institutional Shares 5.87% 1.25% 1.28% Spliced Bloomberg U.S. Treasury 1–3 Year Index 5.90% 1.30% 1.32% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 24,903,000,000 |
| Holdings Count | Holding | 98 |
| Advisory Fees Paid, Amount | $ 501,000 |
| Investment Company Portfolio Turnover | 89% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 98 Portfolio Turnover Rate 89 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 1 - 2 Years 55.8 % 2 - 3 Years 43.3 % Other Assets and Liabilities—Net 0.9 % |
| C000080846 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Intermediate-Term Treasury Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VGIT |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Intermediate-Term Treasury Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.04 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.04% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, the Fund performed roughly in line with its expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. Yields of U.S. Treasuries fell across the maturity spectrum, with more movement at the shorter end of the yield curve. The broad U.S. investment-grade bond market returned 7.30%, as measured by the Bloomberg U.S. Aggregate Float Adjusted Index. The highest total returns for Treasuries tended to be in the intermediate-term maturities. In general, Treasuries returned less than mortgage-backed securities and corporate bonds. Over the last 10 years, the Fund performed roughly in line with its benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years ETF Shares Net Asset Value 6.49% -0.05% 1.37% ETF Shares Market Price 6.39% -0.05% 1.36% Spliced Bloomberg U.S.Treasury 3–10 Year Index 6.51% -0.01% 1.43% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 37,311,000,000 |
| Holdings Count | Holding | 109 |
| Advisory Fees Paid, Amount | $ 609,000 |
| Investment Company Portfolio Turnover | 52% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 109 Portfolio Turnover Rate 52 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 2 - 4 Years 24.5 % 4 - 6 Years 38.8 % 6 - 8 Years 21.5 % 8 - 10 Years 14.2 % Other Assets and Liabilities—Net 1.0 % |
| C000080844 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Intermediate-Term Treasury Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VSIGX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Intermediate-Term Treasury Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.07 % |
| Expenses Paid, Amount | $ 7 |
| Expense Ratio, Percent | 0.07% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, the Fund performed roughly in line with its expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. Yields of U.S. Treasuries fell across the maturity spectrum, with more movement at the shorter end of the yield curve. The broad U.S. investment-grade bond market returned 7.30%, as measured by the Bloomberg U.S. Aggregate Float Adjusted Index. The highest total returns for Treasuries tended to be in the intermediate-term maturities. In general, Treasuries returned less than mortgage-backed securities and corporate bonds. Over the last 10 years, the Fund performed roughly in line with its benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 6.43% -0.08% 1.35% Spliced Bloomberg U.S.Treasury 3–10 Year Index 6.51% -0.01% 1.43% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 37,311,000,000 |
| Holdings Count | Holding | 109 |
| Advisory Fees Paid, Amount | $ 609,000 |
| Investment Company Portfolio Turnover | 52% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 109 Portfolio Turnover Rate 52 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 2 - 4 Years 24.5 % 4 - 6 Years 38.8 % 6 - 8 Years 21.5 % 8 - 10 Years 14.2 % Other Assets and Liabilities—Net 1.0 % |
| C000080845 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Intermediate-Term Treasury Index Fund |
| Class Name | Institutional Shares |
| Trading Symbol | VIIGX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Intermediate-Term Treasury Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.05 % |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, the Fund performed roughly in line with its expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. Yields of U.S. Treasuries fell across the maturity spectrum, with more movement at the shorter end of the yield curve. The broad U.S. investment-grade bond market returned 7.30%, as measured by the Bloomberg U.S. Aggregate Float Adjusted Index. The highest total returns for Treasuries tended to be in the intermediate-term maturities. In general, Treasuries returned less than mortgage-backed securities and corporate bonds. Over the last 10 years, the Fund performed roughly in line with its benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $5,000,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Institutional Shares 6.51% -0.06% 1.38% Spliced Bloomberg U.S.Treasury 3–10 Year Index 6.51% -0.01% 1.43% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 37,311,000,000 |
| Holdings Count | Holding | 109 |
| Advisory Fees Paid, Amount | $ 609,000 |
| Investment Company Portfolio Turnover | 52% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 109 Portfolio Turnover Rate 52 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 2 - 4 Years 24.5 % 4 - 6 Years 38.8 % 6 - 8 Years 21.5 % 8 - 10 Years 14.2 % Other Assets and Liabilities—Net 1.0 % |
| C000080855 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Intermediate-Term Corporate Bond Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VCIT |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Intermediate-Term Corporate Bond Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.04 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.04% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Intermediate-Term Corporate Bond U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, corporate bonds in the middle of the maturity range outpaced their shorter- and longer-term counterparts. Within the Fund’s benchmark, bonds issued by financial institutions outperformed those of utilities and industrial companies. By credit quality, lower-rated bonds did the best. And bonds with maturities between 7 and 10 years returned more than bonds with maturities between 5 and 7 years. Over the last 10 years, the Fund performed roughly in line with the benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years ETF Shares Net Asset Value 10.19% 1.18% 2.86% ETF Shares Market Price 10.27% 1.17% 2.85% Bloomberg U.S. 5–10 Year Corporate Bond Index 10.23% 1.27% 2.94% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 52,296,000,000 |
| Holdings Count | Holding | 2,201 |
| Advisory Fees Paid, Amount | $ 908,000 |
| Investment Company Portfolio Turnover | 72% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 2,201 Portfolio Turnover Rate 72 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Portfolio Composition % of Net Assets Communications 7.0 % Consumer Discretionary 6.3 % Consumer Staples 6.5 % Energy 6.6 % Financials 31.1 % Health Care 9.3 % Industrials 6.2 % Materials 3.1 % Real Estate 5.5 % Technology 7.6 % Utilities 8.7 % U.S. Government and Agency Obligations 0.6 % Other Assets and Liabilities—Net 1.5 % |
| C000080853 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Intermediate-Term Corporate Bond Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VICSX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Intermediate-Term Corporate Bond Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.07 % |
| Expenses Paid, Amount | $ 7 |
| Expense Ratio, Percent | 0.07% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Intermediate-Term Corporate Bond U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, corporate bonds in the middle of the maturity range outpaced their shorter- and longer-term counterparts. Within the Fund’s benchmark, bonds issued by financial institutions outperformed those of utilities and industrial companies. By credit quality, lower-rated bonds did the best. And bonds with maturities between 7 and 10 years returned more than bonds with maturities between 5 and 7 years. Over the last 10 years, the Fund performed roughly in line with the benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 9.88% 1.11% 2.82% Bloomberg U.S. 5–10 Year Corporate Bond Index 10.23% 1.27% 2.94% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 52,296,000,000 |
| Holdings Count | Holding | 2,201 |
| Advisory Fees Paid, Amount | $ 908,000 |
| Investment Company Portfolio Turnover | 72% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 2,201 Portfolio Turnover Rate 72 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Portfolio Composition % of Net Assets Communications 7.0 % Consumer Discretionary 6.3 % Consumer Staples 6.5 % Energy 6.6 % Financials 31.1 % Health Care 9.3 % Industrials 6.2 % Materials 3.1 % Real Estate 5.5 % Technology 7.6 % Utilities 8.7 % U.S. Government and Agency Obligations 0.6 % Other Assets and Liabilities—Net 1.5 % |
| C000080854 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Intermediate-Term Corporate Bond Index Fund |
| Class Name | Institutional Shares |
| Trading Symbol | VICBX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Intermediate-Term Corporate Bond Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.05 % |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Intermediate-Term Corporate Bond U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, corporate bonds in the middle of the maturity range outpaced their shorter- and longer-term counterparts. Within the Fund’s benchmark, bonds issued by financial institutions outperformed those of utilities and industrial companies. By credit quality, lower-rated bonds did the best. And bonds with maturities between 7 and 10 years returned more than bonds with maturities between 5 and 7 years. Over the last 10 years, the Fund performed roughly in line with the benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $5,000,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Institutional Shares 9.88% 1.12% 2.84% Bloomberg U.S. 5–10 Year Corporate Bond Index 10.23% 1.27% 2.94% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 52,296,000,000 |
| Holdings Count | Holding | 2,201 |
| Advisory Fees Paid, Amount | $ 908,000 |
| Investment Company Portfolio Turnover | 72% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 2,201 Portfolio Turnover Rate 72 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Portfolio Composition % of Net Assets Communications 7.0 % Consumer Discretionary 6.3 % Consumer Staples 6.5 % Energy 6.6 % Financials 31.1 % Health Care 9.3 % Industrials 6.2 % Materials 3.1 % Real Estate 5.5 % Technology 7.6 % Utilities 8.7 % U.S. Government and Agency Obligations 0.6 % Other Assets and Liabilities—Net 1.5 % |
| C000195056 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Total Corporate Bond ETF |
| Class Name | ETF Shares |
| Trading Symbol | VTC |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Total Corporate Bond ETF (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.04 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.04% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Total Corporate Bond ETF performed roughly in line with its expense-free benchmark index. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Corporate bonds, with their yield spreads narrowing, outperformed both Treasuries and mortgage-backed securities. In the ETF’s benchmark index, bonds issued by financial institutions and utilities returned more than those issued by industrial companies. By maturity, bonds maturing in 5 to 20 years posted the strongest gains, which were in the double digits. By credit quality, lower-rated bonds performed better than higher-rated bonds. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform since inception? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: November 7, 2017, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years Since Inception ETF Shares Net Asset Value 9.25% 0.57% 2.04 % ETF Shares Market Price 9.20% 0.53% 2.03 % Bloomberg U.S. Corporate Bond Index 9.29% 0.67% 2.13% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.30% |
| Performance Inception Date | Nov. 07, 2017 |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 1,073,000,000 |
| Holdings Count | Holding | 4 |
| Advisory Fees Paid, Amount | $ 0 |
| Investment Company Portfolio Turnover | 8% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 4 Portfolio Turnover Rate 8 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Portfolio Composition % of Net Assets Vanguard Short-Term Corporate Bond ETF 37.7 % Vanguard Long-Term Corporate Bond ETF 33.8 % Vanguard Intermediate-Term Corporate Bond ETF 28.5 % Other Assets and Liabilities—Net 0.0 % |
| C000080849 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Long-Term Treasury Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VGLT |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Long-Term Treasury Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.04 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.04% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, the Fund performed roughly in line with U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. Yields of U.S. Treasuries fell across the maturity spectrum, with more movement at the shorter end of the yield curve. The broad U.S. investment-grade bond market returned 7.30%, as measured by the Bloomberg U.S. Aggregate Float Adjusted Index. The highest total returns for Treasuries tended to be in the intermediate-term maturities. In general, Treasuries returned less than mortgage-backed securities and corporate bonds. Over the last 10 years, the Fund performed roughly in line with its benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years ETF Shares Net Asset Value 4.89% -5.21% 0.64% ETF Shares Market Price 4.73% -5.22% 0.64% Spliced Bloomberg U.S. Long Treasury Index 4.89% -5.14% 0.70% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 19,111,000,000 |
| Holdings Count | Holding | 87 |
| Advisory Fees Paid, Amount | $ 307,000 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 87 Portfolio Turnover Rate 21 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 10 - 15 Years 2.2 % 15 - 20 Years 40.4 % 20 - 25 Years 19.1 % Over 25 Years 37.3 % Other Assets and Liabilities—Net 1.0 % |
| C000080847 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Long-Term Treasury Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VLGSX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Long-Term Treasury Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.07 % |
| Expenses Paid, Amount | $ 7 |
| Expense Ratio, Percent | 0.07% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, the Fund performed roughly in line with U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. Yields of U.S. Treasuries fell across the maturity spectrum, with more movement at the shorter end of the yield curve. The broad U.S. investment-grade bond market returned 7.30%, as measured by the Bloomberg U.S. Aggregate Float Adjusted Index. The highest total returns for Treasuries tended to be in the intermediate-term maturities. In general, Treasuries returned less than mortgage-backed securities and corporate bonds. Over the last 10 years, the Fund performed roughly in line with its benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 4.83% -5.24% 0.62% Spliced Bloomberg U.S. Long Treasury Index 4.89% -5.14% 0.70% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 19,111,000,000 |
| Holdings Count | Holding | 87 |
| Advisory Fees Paid, Amount | $ 307,000 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 87 Portfolio Turnover Rate 21 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 10 - 15 Years 2.2 % 15 - 20 Years 40.4 % 20 - 25 Years 19.1 % Over 25 Years 37.3 % Other Assets and Liabilities—Net 1.0 % |
| C000080848 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Long-Term Treasury Index Fund |
| Class Name | Institutional Shares |
| Trading Symbol | VLGIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Long-Term Treasury Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.05 % |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, the Fund performed roughly in line with U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. Yields of U.S. Treasuries fell across the maturity spectrum, with more movement at the shorter end of the yield curve. The broad U.S. investment-grade bond market returned 7.30%, as measured by the Bloomberg U.S. Aggregate Float Adjusted Index. The highest total returns for Treasuries tended to be in the intermediate-term maturities. In general, Treasuries returned less than mortgage-backed securities and corporate bonds. Over the last 10 years, the Fund performed roughly in line with its benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $5,000,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Institutional Shares 4.84% -5.23% 0.65% Spliced Bloomberg U.S. Long Treasury Index 4.89% -5.14% 0.70% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 19,111,000,000 |
| Holdings Count | Holding | 87 |
| Advisory Fees Paid, Amount | $ 307,000 |
| Investment Company Portfolio Turnover | 21% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 87 Portfolio Turnover Rate 21 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 10 - 15 Years 2.2 % 15 - 20 Years 40.4 % 20 - 25 Years 19.1 % Over 25 Years 37.3 % Other Assets and Liabilities—Net 1.0 % |
| C000080858 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Long-Term Corporate Bond Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VCLT |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Long-Term Corporate Bond Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.04 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.04% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Long-Term Corporate Bond Index Fund performed roughly in line with the Bloomberg U.S. 10+ Year Corporate Bond Index, its primary, expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, corporate bonds in the middle of the maturity range outpaced their shorter- and longer-term counterparts. Within the Fund’s benchmark, bonds issued by financial institutions outperformed those of utilities and industrial companies. By credit quality, lower-rated bonds did the best. And bonds with maturities between 10 and 25 years returned more than bonds with maturities of more than 25 years. Over the last 10 years, the Fund performed roughly in line with the benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years ETF Shares Net Asset Value 9.90% -1.22% 2.65% ETF Shares Market Price 9.80% -1.21% 2.64% Bloomberg U.S. 10+ Year Corporate Bond Index 9.94% -1.13% 2.68% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 13,855,000,000 |
| Holdings Count | Holding | 2,954 |
| Advisory Fees Paid, Amount | $ 177,000 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 2,954 Portfolio Turnover Rate 33 % Total Investment Advisory Fees $ |
| 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 Communications 11.6 % Consumer Discretionary 5.8 % Consumer Staples 7.3 % Energy 9.3 % Financials 13.4 % Health Care 16.2 % Industrials 8.3 % Materials 3.3 % Real Estate 1.5 % Technology 8.5 % Utilities 12.7 % U.S. Government and Agency Obligations 0.2 % Other Assets and Liabilities—Net 1.9 % |
| C000080856 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Long-Term Corporate Bond Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VLTCX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Long-Term Corporate Bond Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.07 % |
| Expenses Paid, Amount | $ 7 |
| Expense Ratio, Percent | 0.07% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Long-Term Corporate Bond Index Fund performed roughly in line with the Bloomberg U.S. 10+ Year Corporate Bond Index, its primary, expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, corporate bonds in the middle of the maturity range outpaced their shorter- and longer-term counterparts. Within the Fund’s benchmark, bonds issued by financial institutions outperformed those of utilities and industrial companies. By credit quality, lower-rated bonds did the best. And bonds with maturities between 10 and 25 years returned more than bonds with maturities of more than 25 years. Over the last 10 years, the Fund performed roughly in line with the benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 8.74% -1.45% 2.54% Bloomberg U.S. 10+ Year Corporate Bond Index 9.94% -1.13% 2.68% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 13,855,000,000 |
| Holdings Count | Holding | 2,954 |
| Advisory Fees Paid, Amount | $ 177,000 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 2,954 Portfolio Turnover Rate 33 % Total Investment Advisory Fees $ |
| 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 Communications 11.6 % Consumer Discretionary 5.8 % Consumer Staples 7.3 % Energy 9.3 % Financials 13.4 % Health Care 16.2 % Industrials 8.3 % Materials 3.3 % Real Estate 1.5 % Technology 8.5 % Utilities 12.7 % U.S. Government and Agency Obligations 0.2 % Other Assets and Liabilities—Net 1.9 % |
| C000080857 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Long-Term Corporate Bond Index Fund |
| Class Name | Institutional Shares |
| Trading Symbol | VLCIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Long-Term Corporate Bond Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.05 % |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Long-Term Corporate Bond Index Fund performed roughly in line with the Bloomberg U.S. 10+ Year Corporate Bond Index, its primary, expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, corporate bonds in the middle of the maturity range outpaced their shorter- and longer-term counterparts. Within the Fund’s benchmark, bonds issued by financial institutions outperformed those of utilities and industrial companies. By credit quality, lower-rated bonds did the best. And bonds with maturities between 10 and 25 years returned more than bonds with maturities of more than 25 years. Over the last 10 years, the Fund performed roughly in line with the benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $5,000,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Institutional Shares 8.82% -1.42% 2.56% Bloomberg U.S. 10+ Year Corporate Bond Index 9.94% -1.13% 2.68% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 13,855,000,000 |
| Holdings Count | Holding | 2,954 |
| Advisory Fees Paid, Amount | $ 177,000 |
| Investment Company Portfolio Turnover | 33% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 2,954 Portfolio Turnover Rate 33 % Total Investment Advisory Fees $ |
| 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 Communications 11.6 % Consumer Discretionary 5.8 % Consumer Staples 7.3 % Energy 9.3 % Financials 13.4 % Health Care 16.2 % Industrials 8.3 % Materials 3.3 % Real Estate 1.5 % Technology 8.5 % Utilities 12.7 % U.S. Government and Agency Obligations 0.2 % Other Assets and Liabilities—Net 1.9 % |
| C000080852 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Short-Term Corporate Bond Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VCSH |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Short-Term Corporate Bond Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.04 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.04% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Short-Term Corporate Bond U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, intermediate-term corporate bonds outpaced their shorter- and longer-term counterparts. Within the Fund’s benchmark, bonds issued by financial institutions outperformed those of utilities and industrial companies. By credit quality, lower-rated bonds did the best. And bonds with maturities between 3 and 5 years returned more than bonds with maturities between 1 and 3 years. Over the last 10 years, the Fund performed roughly in line with the benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years ETF Shares Net Asset Value 7.99% 1.97% 2.29% ETF Shares Market Price 8.03% 1.96% 2.29% Bloomberg U.S. 1–5 Year Corporate Bond Index 8.02% 2.06% 2.38% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 42,152,000,000 |
| Holdings Count | Holding | 2,641 |
| Advisory Fees Paid, Amount | $ 823,000 |
| Investment Company Portfolio Turnover | 69% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 2,641 Portfolio Turnover Rate 69 % Total Investment Advisory Fees $ |
| 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 Communications 5.2 % Consumer Discretionary 7.6 % Consumer Staples 5.5 % Energy 5.0 % Financials 40.1 % Health Care 8.2 % Industrials 6.5 % Materials 2.1 % Real Estate 4.0 % Technology 7.6 % Utilities 6.3 % U.S. Government and Agency Obligations 0.6 % Other Assets and Liabilities—Net 1.3 % |
| C000080850 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Short-Term Corporate Bond Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VSCSX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Short-Term Corporate Bond Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.07 % |
| Expenses Paid, Amount | $ 7 |
| Expense Ratio, Percent | 0.07% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Short-Term Corporate Bond U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, intermediate-term corporate bonds outpaced their shorter- and longer-term counterparts. Within the Fund’s benchmark, bonds issued by financial institutions outperformed those of utilities and industrial companies. By credit quality, lower-rated bonds did the best. And bonds with maturities between 3 and 5 years returned more than bonds with maturities between 1 and 3 years. Over the last 10 years, the Fund performed roughly in line with the benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 7.99% 1.94% 2.28% Bloomberg U.S. 1–5 Year Corporate Bond Index 8.02% 2.06% 2.38% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 42,152,000,000 |
| Holdings Count | Holding | 2,641 |
| Advisory Fees Paid, Amount | $ 823,000 |
| Investment Company Portfolio Turnover | 69% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 2,641 Portfolio Turnover Rate 69 % Total Investment Advisory Fees $ |
| 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 Communications 5.2 % Consumer Discretionary 7.6 % Consumer Staples 5.5 % Energy 5.0 % Financials 40.1 % Health Care 8.2 % Industrials 6.5 % Materials 2.1 % Real Estate 4.0 % Technology 7.6 % Utilities 6.3 % U.S. Government and Agency Obligations 0.6 % Other Assets and Liabilities—Net 1.3 % |
| C000080851 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Short-Term Corporate Bond Index Fund |
| Class Name | Institutional Shares |
| Trading Symbol | VSTBX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Short-Term Corporate Bond Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.05 % |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Short-Term Corporate Bond U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, intermediate-term corporate bonds outpaced their shorter- and longer-term counterparts. Within the Fund’s benchmark, bonds issued by financial institutions outperformed those of utilities and industrial companies. By credit quality, lower-rated bonds did the best. And bonds with maturities between 3 and 5 years returned more than bonds with maturities between 1 and 3 years. Over the last 10 years, the Fund performed roughly in line with the benchmark. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $5,000,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Institutional Shares 7.95% 1.96% 2.29% Bloomberg U.S. 1–5 Year Corporate Bond Index 8.02% 2.06% 2.38% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 42,152,000,000 |
| Holdings Count | Holding | 2,641 |
| Advisory Fees Paid, Amount | $ 823,000 |
| Investment Company Portfolio Turnover | 69% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 2,641 Portfolio Turnover Rate 69 % Total Investment Advisory Fees $ |
| 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 Communications 5.2 % Consumer Discretionary 7.6 % Consumer Staples 5.5 % Energy 5.0 % Financials 40.1 % Health Care 8.2 % Industrials 6.5 % Materials 2.1 % Real Estate 4.0 % Technology 7.6 % Utilities 6.3 % U.S. Government and Agency Obligations 0.6 % Other Assets and Liabilities—Net 1.3 % |
| C000080861 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Mortgage-Backed Securities Index Fund |
| Class Name | ETF Shares |
| Trading Symbol | VMBS |
| Security Exchange Name | NASDAQ |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Mortgage-Backed Securities Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.04 % |
| Expenses Paid, Amount | $ 4 |
| Expense Ratio, Percent | 0.04% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Mortgage-Backed Securities Index Fund performed roughly in line with the return of its expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, bonds at the lower end of the investment-grade spectrum posted higher returns than those with higher credit ratings. By duration, the highest total returns tended to be in the medium-term maturities. By sector, mortgage-backed securities fell in the middle among returns. The average interest rate for 30-year fixed-rate mortgages fell from 7.18% for the week ended August 31, 2023, to 6.35% for the week ended August 29, 2024. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years ETF Shares Net Asset Value 7.49% -0.19% 1.19% ETF Shares Market Price 7.38% -0.19% 1.19% Bloomberg U.S. MBS Float Adjusted Index 7.48% -0.08% 1.28% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 19,829,000,000 |
| Holdings Count | Holding | 94 |
| Advisory Fees Paid, Amount | $ 372,000 |
| Investment Company Portfolio Turnover | 79% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 94 Portfolio Turnover Rate 79 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 0 - 10 Years 1.6 % 10 - 20 Years 13.0 % 20 - 30 Years 82.1 % 30 - 40 Years 2.5 % Other Assets and Liabilities—Net 0.8 % |
| C000080859 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Mortgage-Backed Securities Index Fund |
| Class Name | Admiral™ Shares |
| Trading Symbol | VMBSX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Mortgage-Backed Securities Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.07 % |
| Expenses Paid, Amount | $ 7 |
| Expense Ratio, Percent | 0.07% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Mortgage-Backed Securities Index Fund performed roughly in line with the return of its expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, bonds at the lower end of the investment-grade spectrum posted higher returns than those with higher credit ratings. By duration, the highest total returns tended to be in the medium-term maturities. By sector, mortgage-backed securities fell in the middle among returns. The average interest rate for 30-year fixed-rate mortgages fell from 7.18% for the week ended August 31, 2023, to 6.35% for the week ended August 29, 2024. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $10,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Admiral Shares 7.47% -0.21% 1.17% Bloomberg U.S. MBS Float Adjusted Index 7.48% -0.08% 1.28% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 19,829,000,000 |
| Holdings Count | Holding | 94 |
| Advisory Fees Paid, Amount | $ 372,000 |
| Investment Company Portfolio Turnover | 79% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 94 Portfolio Turnover Rate 79 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 0 - 10 Years 1.6 % 10 - 20 Years 13.0 % 20 - 30 Years 82.1 % 30 - 40 Years 2.5 % Other Assets and Liabilities—Net 0.8 % |
| C000080860 [Member] | |
| Shareholder Report [Line Items] | |
| Fund Name | Vanguard Mortgage-Backed Securities Index Fund |
| Class Name | Institutional Shares |
| Trading Symbol | VMBIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Vanguard Mortgage-Backed Securities Index Fund (the "Fund") for the period of September 1, 2023 |
| Shareholder Report Annual or Semi-Annual | 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 year? (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 $ 0.05 % |
| Expenses Paid, Amount | $ 5 |
| Expense Ratio, Percent | 0.05% |
| Factors Affecting Performance [Text Block] | How did the Fund perform during the reporting period? For the 12 months ended August 31, 2024, Vanguard Mortgage-Backed Securities Index Fund performed roughly in line with the return of its expense-free benchmark. U.S. economic growth hovered around 3% on a year-over-year basis during the 12 months, quelling recession fears. The Federal Reserve kept its target for short-term interest rates above 5%, and the year-over-year rate of consumer price inflation eased to around 3%. The Bloomberg U.S. Aggregate Float Adjusted Index of investment-grade bonds returned 7.30%. Broadly, bonds at the lower end of the investment-grade spectrum posted higher returns than those with higher credit ratings. By duration, the highest total returns tended to be in the medium-term maturities. By sector, mortgage-backed securities fell in the middle among returns. The average interest rate for 30-year fixed-rate mortgages fell from 7.18% for the week ended August 31, 2023, to 6.35% for the week ended August 29, 2024. |
| Performance Past Does Not Indicate Future [Text] | Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. |
| Line Graph [Table Text Block] | How did the Fund perform over the past 10 years? Keep in mind that the Fund's past performance does not indicate how the Fund will perform in the future. Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. Cumulative Performance: August 31, 2014, Through August 31, 2024 Initial Investment of $5,000,000 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years Institutional Shares 7.50% -0.19% 1.19% Bloomberg U.S. MBS Float Adjusted Index 7.48% -0.08% 1.28% Bloomberg U.S. Aggregate Float Adjusted Index 7.30% -0.02% 1.66% |
| No Deduction of Taxes [Text Block] | The graph and returns shown do not reflect taxes that a shareholder would pay on fund distributions or on the sale of fund shares. |
| Updated Performance Information Location [Text Block] | Updated performance information is available on our website at vanguard.com/performance or by calling Vanguard toll-free at 800-662-7447. |
| Net Assets | $ 19,829,000,000 |
| Holdings Count | Holding | 94 |
| Advisory Fees Paid, Amount | $ 372,000 |
| Investment Company Portfolio Turnover | 79% |
| Additional Fund Statistics [Text Block] | Fund Statistics Fund Net Assets $ Number of Portfolio Holdings 94 Portfolio Turnover Rate 79 % Total Investment Advisory Fees $ |
| Holdings [Text Block] | This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. Distribution by Stated Maturity % of Net Asset 0 - 10 Years 1.6 % 10 - 20 Years 13.0 % 20 - 30 Years 82.1 % 30 - 40 Years 2.5 % Other Assets and Liabilities—Net 0.8 % |
Shareholder Report, Line Graph
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | 60 Months Ended | 72 Months Ended | 82 Months Ended | 120 Months Ended | ||||||||||||
| Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2024 | Aug. 31, 2023 | Aug. 31, 2022 | Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019 | Sep. 04, 2018 | Aug. 31, 2018 | Nov. 07, 2017 | Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014 | |
| C000203194 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Net Asset Value | ||||||||||||||||
| Account Value | $ 10,956 | $ 10,956 | $ 10,956 | $ 10,956 | $ 10,956 | $ 10,223 | $ 10,227 | $ 11,557 | $ 11,510 | $ 11,100 | $ 10,000 | ||||||
| Average Annual Return, Percent | 7.17% | (0.26%) | 1.54% | ||||||||||||||
| C000203194 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Market Price | ||||||||||||||||
| Average Annual Return, Percent | 7.21% | (0.27%) | 1.54% | ||||||||||||||
| C000080843 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Net Asset Value | ||||||||||||||||
| Account Value | $ 11,345 | $ 11,345 | $ 11,345 | 11,345 | $ 11,345 | 10,715 | 10,585 | 11,034 | 11,022 | 10,657 | $ 10,209 | $ 10,224 | $ 10,173 | $ 10,075 | $ 10,000 | ||
| Average Annual Return, Percent | 5.88% | 1.26% | 1.27% | ||||||||||||||
| C000080843 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Market Price | ||||||||||||||||
| Average Annual Return, Percent | 5.79% | 1.26% | 1.27% | ||||||||||||||
| C000080841 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Admiral Shares | ||||||||||||||||
| Account Value | $ 11,323 | $ 11,323 | 11,323 | 11,323 | $ 11,323 | 10,702 | 10,572 | 11,023 | 11,014 | 10,651 | 10,208 | 10,224 | 10,171 | 10,072 | 10,000 | ||
| Average Annual Return, Percent | 5.81% | 1.23% | 1.25% | ||||||||||||||
| C000080842 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Institutional Shares | ||||||||||||||||
| Account Value | $ 5,675,658 | $ 5,675,658 | 5,675,658 | 5,675,658 | $ 5,675,658 | 5,360,752 | 5,296,615 | 5,521,747 | 5,515,709 | 5,333,469 | 5,108,918 | 5,116,995 | 5,088,315 | 5,039,058 | 5,000,000 | ||
| Average Annual Return, Percent | 5.87% | 1.25% | 1.28% | ||||||||||||||
| C000080846 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Net Asset Value | ||||||||||||||||
| Account Value | $ 11,459 | $ 11,459 | 11,459 | 11,459 | $ 11,459 | 10,760 | 10,896 | 12,108 | 12,262 | 11,486 | 10,457 | 10,693 | 10,716 | 10,267 | 10,000 | ||
| Average Annual Return, Percent | 6.49% | (0.05%) | 1.37% | ||||||||||||||
| C000080846 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Market Price | ||||||||||||||||
| Average Annual Return, Percent | 6.39% | (0.05%) | 1.36% | ||||||||||||||
| C000080844 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Admiral Shares | ||||||||||||||||
| Account Value | $ 11,440 | $ 11,440 | 11,440 | 11,440 | $ 11,440 | 10,750 | 10,884 | 12,100 | 12,261 | 11,485 | 10,457 | 10,696 | 10,716 | 10,267 | 10,000 | ||
| Average Annual Return, Percent | 6.43% | (0.08%) | 1.35% | ||||||||||||||
| C000080845 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Institutional Shares | ||||||||||||||||
| Account Value | $ 5,733,281 | $ 5,733,281 | 5,733,281 | 5,733,281 | $ 5,733,281 | 5,382,796 | 5,452,154 | 6,060,236 | 6,137,784 | 5,749,216 | 5,234,515 | 5,349,831 | 5,361,061 | 5,134,346 | 5,000,000 | ||
| Average Annual Return, Percent | 6.51% | (0.06%) | 1.38% | ||||||||||||||
| C000080855 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Net Asset Value | ||||||||||||||||
| Account Value | $ 13,255 | $ 13,255 | 13,255 | 13,255 | $ 13,255 | 12,029 | 11,845 | 13,751 | 13,472 | 12,500 | 11,030 | 11,211 | 10,993 | 10,032 | 10,000 | ||
| Average Annual Return, Percent | 10.19% | 1.18% | 2.86% | ||||||||||||||
| C000080855 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Market Price | ||||||||||||||||
| Average Annual Return, Percent | 10.27% | 1.17% | 2.85% | ||||||||||||||
| C000080853 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Admiral Shares | ||||||||||||||||
| Account Value | $ 13,212 | $ 13,212 | 13,212 | 13,212 | $ 13,212 | 11,993 | 11,810 | 13,717 | 13,444 | 12,472 | 11,008 | 11,188 | 10,970 | 10,011 | 10,000 | ||
| Average Annual Return, Percent | 9.88% | 1.11% | 2.82% | ||||||||||||||
| C000080854 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Institutional Shares | ||||||||||||||||
| Account Value | $ 6,615,547 | $ 6,615,547 | 6,615,547 | 6,615,547 | $ 6,615,547 | 6,005,595 | 5,914,698 | 6,867,084 | 6,727,910 | 6,240,506 | 5,507,714 | 5,595,713 | 5,485,550 | 5,006,152 | 5,000,000 | ||
| Average Annual Return, Percent | 9.88% | 1.12% | 2.84% | ||||||||||||||
| C000195056 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Net Asset Value | ||||||||||||||||
| Account Value | $ 11,473 | $ 11,473 | 11,473 | $ 11,473 | $ 11,473 | 10,501 | 10,384 | 12,232 | 11,949 | 11,149 | 9,841 | $ 10,000 | |||||
| Average Annual Return, Percent | 9.25% | 0.57% | 2.04% | ||||||||||||||
| C000195056 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Market Price | ||||||||||||||||
| Average Annual Return, Percent | 9.20% | 0.53% | 2.03% | ||||||||||||||
| C000080849 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Net Asset Value | ||||||||||||||||
| Account Value | $ 10,659 | $ 10,659 | 10,659 | $ 10,659 | $ 10,659 | 10,162 | 11,254 | 14,556 | 15,606 | 13,931 | 11,173 | 11,527 | 12,215 | 10,444 | 10,000 | ||
| Average Annual Return, Percent | 4.89% | (5.21%) | 0.64% | ||||||||||||||
| C000080849 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Market Price | ||||||||||||||||
| Average Annual Return, Percent | 4.73% | (5.22%) | 0.64% | ||||||||||||||
| C000080847 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Admiral Shares | ||||||||||||||||
| Account Value | $ 10,639 | $ 10,639 | 10,639 | 10,639 | $ 10,639 | 10,149 | 11,244 | 14,543 | 15,601 | 13,929 | 11,173 | 11,526 | 12,212 | 10,440 | 10,000 | ||
| Average Annual Return, Percent | 4.83% | (5.24%) | 0.62% | ||||||||||||||
| C000080848 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Institutional Shares | ||||||||||||||||
| Account Value | $ 5,332,400 | $ 5,332,400 | 5,332,400 | 5,332,400 | $ 5,332,400 | 5,086,241 | 5,631,594 | 7,283,988 | 7,812,710 | 6,973,549 | 5,591,694 | 5,768,822 | 6,110,791 | 5,223,395 | 5,000,000 | ||
| Average Annual Return, Percent | 4.84% | (5.23%) | 0.65% | ||||||||||||||
| C000080858 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Net Asset Value | ||||||||||||||||
| Account Value | $ 12,994 | $ 12,994 | 12,994 | 12,994 | $ 12,994 | 11,824 | 11,975 | 15,564 | 14,910 | 13,818 | 11,363 | 11,596 | 11,390 | 9,636 | 10,000 | ||
| Average Annual Return, Percent | 9.90% | (1.22%) | 2.65% | ||||||||||||||
| C000080858 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Market Price | ||||||||||||||||
| Average Annual Return, Percent | 9.80% | (1.21%) | 2.64% | ||||||||||||||
| C000080856 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Admiral Shares | ||||||||||||||||
| Account Value | $ 12,852 | $ 12,852 | 12,852 | 12,852 | $ 12,852 | 11,701 | 11,850 | 15,408 | 14,764 | 13,687 | 11,252 | 11,482 | 11,275 | 9,538 | 10,000 | ||
| Average Annual Return, Percent | 8.74% | (1.45%) | 2.54% | ||||||||||||||
| C000080857 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Institutional Shares | ||||||||||||||||
| Account Value | $ 6,437,761 | $ 6,437,761 | 6,437,761 | 6,437,761 | $ 6,437,761 | 5,857,008 | 5,932,800 | 7,710,369 | 7,387,269 | 6,845,675 | 5,630,486 | 5,742,596 | 5,640,307 | 4,770,834 | 5,000,000 | ||
| Average Annual Return, Percent | 8.82% | (1.42%) | 2.56% | ||||||||||||||
| C000080852 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Net Asset Value | ||||||||||||||||
| Account Value | $ 12,543 | $ 12,543 | 12,543 | 12,543 | $ 12,543 | 11,615 | 11,362 | 12,112 | 11,940 | 11,376 | 10,663 | 10,662 | 10,470 | 10,096 | 10,000 | ||
| Average Annual Return, Percent | 7.99% | 1.97% | 2.29% | ||||||||||||||
| C000080852 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Market Price | ||||||||||||||||
| Average Annual Return, Percent | 8.03% | 1.96% | 2.29% | ||||||||||||||
| C000080850 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Admiral Shares | ||||||||||||||||
| Account Value | $ 12,526 | $ 12,526 | 12,526 | 12,526 | $ 12,526 | 11,599 | 11,353 | 12,108 | 11,936 | 11,378 | 10,663 | 10,661 | 10,470 | 10,097 | 10,000 | ||
| Average Annual Return, Percent | 7.99% | 1.94% | 2.28% | ||||||||||||||
| C000080851 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Institutional Shares | ||||||||||||||||
| Account Value | $ 6,271,938 | $ 6,271,938 | 6,271,938 | 6,271,938 | $ 6,271,938 | 5,810,304 | 5,683,926 | 6,060,402 | 5,974,644 | 5,692,144 | 5,336,657 | 5,332,982 | 5,236,885 | 5,049,043 | 5,000,000 | ||
| Average Annual Return, Percent | 7.95% | 1.96% | 2.29% | ||||||||||||||
| C000080861 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Net Asset Value | ||||||||||||||||
| Account Value | $ 11,250 | $ 11,250 | 11,250 | 11,250 | $ 11,250 | 10,466 | 10,673 | 11,822 | 11,863 | 11,357 | 10,635 | 10,706 | 10,628 | 10,249 | 10,000 | ||
| Average Annual Return, Percent | 7.49% | (0.19%) | 1.19% | ||||||||||||||
| C000080861 [Member] | Without Sales Load [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ETF Shares Market Price | ||||||||||||||||
| Average Annual Return, Percent | 7.38% | (0.19%) | 1.19% | ||||||||||||||
| C000080859 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Admiral Shares | ||||||||||||||||
| Account Value | $ 11,234 | $ 11,234 | 11,234 | 11,234 | $ 11,234 | 10,453 | 10,661 | 11,809 | 11,854 | 11,351 | 10,631 | 10,704 | 10,624 | 10,244 | 10,000 | ||
| Average Annual Return, Percent | 7.47% | (0.21%) | 1.17% | ||||||||||||||
| C000080860 [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Institutional Shares | ||||||||||||||||
| Account Value | $ 5,627,039 | $ 5,627,039 | 5,627,039 | 5,627,039 | $ 5,627,039 | 5,234,686 | 5,340,187 | 5,914,069 | 5,936,386 | 5,682,080 | 5,320,158 | 5,356,821 | 5,314,958 | 5,124,539 | 5,000,000 | ||
| Average Annual Return, Percent | 7.50% | (0.19%) | 1.19% | ||||||||||||||
| Bloomberg Global Aggregate Float Adjusted Composite Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Global Aggregate Float Adjusted Composite Index | ||||||||||||||||
| Account Value | $ 11,004 | $ 11,004 | $ 11,004 | 11,004 | $ 11,004 | 10,255 | 10,268 | 11,599 | 11,536 | 11,121 | 10,000 | ||||||
| Average Annual Return, Percent | 7.31% | (0.21%) | 1.61% | ||||||||||||||
| Bloomberg Global Aggregate Float Adjusted Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg Global Aggregate Float Adjusted Index | ||||||||||||||||
| Account Value | $ 10,317 | $ 10,317 | $ 10,317 | 10,317 | 10,317 | 9,611 | 9,567 | 11,579 | 11,489 | 10,826 | $ 10,000 | ||||||
| Average Annual Return, Percent | 7.34% | (0.96%) | 0.52% | ||||||||||||||
| Spliced Bloomberg U S Treasury 1 3 Year Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Spliced Bloomberg U.S. Treasury 1–3 Year Index | ||||||||||||||||
| Account Value | $ 11,406 | $ 11,406 | $ 11,406 | 11,406 | $ 11,406 | 10,770 | 10,636 | 11,083 | 11,067 | 10,693 | 10,241 | 10,248 | 10,192 | 10,084 | 10,000 | ||
| Average Annual Return, Percent | 5.90% | 1.30% | 1.32% | ||||||||||||||
| Bloomberg U S Aggregate Float Adjusted Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Float Adjusted Index | ||||||||||||||||
| Account Value | $ 11,793 | $ 11,793 | 11,793 | $ 11,793 | $ 11,793 | 10,991 | 11,108 | 12,572 | 12,581 | 11,805 | 10,696 | 10,000 | 10,814 | 10,764 | 10,140 | 10,000 | |
| Average Annual Return, Percent | 7.30% | (0.02%) | 1.30% | 1.66% | |||||||||||||
| Spliced Bloomberg U S Treasury 3 10 Year Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Spliced Bloomberg U.S.Treasury 3–10 Year Index | ||||||||||||||||
| Account Value | $ 11,523 | $ 11,523 | 11,523 | $ 11,523 | $ 11,523 | 10,818 | 10,950 | 12,165 | 12,324 | 11,528 | 10,499 | 10,722 | 10,746 | 10,286 | 10,000 | ||
| Average Annual Return, Percent | 6.51% | (0.01%) | 1.43% | ||||||||||||||
| Bloomberg U S 5 10 Year Corporate Bond Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. 5–10 Year Corporate Bond Index | ||||||||||||||||
| Account Value | $ 13,360 | $ 13,360 | 13,360 | 13,360 | $ 13,360 | 12,120 | 11,925 | 13,839 | 13,574 | 12,543 | 11,074 | 11,242 | 10,990 | 10,039 | 10,000 | ||
| Average Annual Return, Percent | 10.23% | 1.27% | 2.94% | ||||||||||||||
| Bloomberg U S Corporate Bond Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Corporate Bond Index | ||||||||||||||||
| Account Value | $ 11,546 | $ 11,546 | 11,546 | $ 11,546 | $ 11,546 | 10,565 | 10,471 | 12,307 | 12,003 | 11,165 | 9,852 | $ 10,000 | |||||
| Average Annual Return, Percent | 9.29% | 0.67% | 2.13% | ||||||||||||||
| Spliced Bloomberg U S Long Treasury Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Spliced Bloomberg U.S. Long Treasury Index | ||||||||||||||||
| Account Value | $ 10,721 | $ 10,721 | 10,721 | $ 10,721 | $ 10,721 | 10,222 | 11,318 | 14,630 | 15,777 | 13,961 | 11,242 | 11,560 | 12,247 | 10,505 | 10,000 | ||
| Average Annual Return, Percent | 4.89% | (5.14%) | 0.70% | ||||||||||||||
| Bloomberg U S 10 Year Corporate Bond Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. 10+ Year Corporate Bond Index | ||||||||||||||||
| Account Value | $ 13,024 | $ 13,024 | 13,024 | 13,024 | $ 13,024 | 11,846 | 11,992 | 15,580 | 14,988 | 13,782 | 11,384 | 11,598 | 11,362 | 9,652 | 10,000 | ||
| Average Annual Return, Percent | 9.94% | (1.13%) | 2.68% | ||||||||||||||
| Bloomberg U S 1 5 Year Corporate Bond Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. 1–5 Year Corporate Bond Index | ||||||||||||||||
| Account Value | $ 12,646 | $ 12,646 | 12,646 | 12,646 | $ 12,646 | 11,707 | 11,449 | 12,204 | 12,034 | 11,422 | 10,706 | 10,698 | 10,485 | 10,103 | 10,000 | ||
| Average Annual Return, Percent | 8.02% | 2.06% | 2.38% | ||||||||||||||
| Bloomberg U S MBS Float Adjusted Index [Member] | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. MBS Float Adjusted Index | ||||||||||||||||
| Account Value | $ 11,360 | $ 11,360 | $ 11,360 | $ 11,360 | $ 11,360 | $ 10,569 | $ 10,770 | $ 11,895 | $ 11,915 | $ 11,403 | $ 10,670 | $ 10,722 | $ 10,636 | $ 10,251 | $ 10,000 | ||
| Average Annual Return, Percent | 7.48% | (0.08%) | 1.28% |
Shareholder Report, Holdings (D
| Shareholder Report, Holdings (Details) | Aug. 31, 2024 |
| C000203194 [Member] | Vanguard Total Bond Market ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 51.30% |
| C000203194 [Member] | Vanguard Total International Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 48.70% |
| C000203194 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000080843 [Member] | One To 2 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.80% |
| C000080843 [Member] | Two To 3 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.30% |
| C000080843 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000080841 [Member] | One To 2 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.80% |
| C000080841 [Member] | Two To 3 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.30% |
| C000080841 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000080842 [Member] | One To 2 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 55.80% |
| C000080842 [Member] | Two To 3 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 43.30% |
| C000080842 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000080846 [Member] | Two To 4 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.50% |
| C000080846 [Member] | Four To 6 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38.80% |
| C000080846 [Member] | Six To 8 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.50% |
| C000080846 [Member] | Eight To 10 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| C000080846 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000080844 [Member] | Two To 4 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.50% |
| C000080844 [Member] | Four To 6 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38.80% |
| C000080844 [Member] | Six To 8 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.50% |
| C000080844 [Member] | Eight To 10 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| C000080844 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000080845 [Member] | Two To 4 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24.50% |
| C000080845 [Member] | Four To 6 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 38.80% |
| C000080845 [Member] | Six To 8 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 21.50% |
| C000080845 [Member] | Eight To 10 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.20% |
| C000080845 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000080855 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| C000080855 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.10% |
| C000080855 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| C000080855 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| C000080855 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| C000080855 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000080855 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000080855 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000080855 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000080855 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000080855 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000080855 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000080855 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000080853 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| C000080853 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.10% |
| C000080853 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| C000080853 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| C000080853 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| C000080853 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000080853 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000080853 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000080853 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000080853 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000080853 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000080853 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000080853 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000080854 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.60% |
| C000080854 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.10% |
| C000080854 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| C000080854 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| C000080854 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| C000080854 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7% |
| C000080854 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000080854 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000080854 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000080854 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000080854 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.70% |
| C000080854 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000080854 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000195056 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000195056 [Member] | Vanguard Short Term Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.70% |
| C000195056 [Member] | Vanguard Long Term Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.80% |
| C000195056 [Member] | Vanguard Intermediate Term Corporate Bond ETF [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.50% |
| C000080849 [Member] | Ten To 15 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000080849 [Member] | Fifteen To 20 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.40% |
| C000080849 [Member] | Twenty To 25 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| C000080849 [Member] | Over 25 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.30% |
| C000080849 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000080847 [Member] | Ten To 15 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000080847 [Member] | Fifteen To 20 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.40% |
| C000080847 [Member] | Twenty To 25 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| C000080847 [Member] | Over 25 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.30% |
| C000080847 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000080848 [Member] | Ten To 15 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000080848 [Member] | Fifteen To 20 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.40% |
| C000080848 [Member] | Twenty To 25 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| C000080848 [Member] | Over 25 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 37.30% |
| C000080848 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000080858 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| C000080858 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.40% |
| C000080858 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| C000080858 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000080858 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.50% |
| C000080858 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| C000080858 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000080858 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| C000080858 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.30% |
| C000080858 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000080858 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| C000080858 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000080858 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000080856 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| C000080856 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.40% |
| C000080856 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| C000080856 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000080856 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.50% |
| C000080856 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| C000080856 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000080856 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| C000080856 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.30% |
| C000080856 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000080856 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| C000080856 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000080856 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000080857 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.30% |
| C000080857 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.40% |
| C000080857 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.20% |
| C000080857 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000080857 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.50% |
| C000080857 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.60% |
| C000080857 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000080857 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.30% |
| C000080857 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.30% |
| C000080857 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.30% |
| C000080857 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.70% |
| C000080857 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000080857 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000080852 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000080852 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.10% |
| C000080852 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| C000080852 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000080852 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| C000080852 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000080852 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| C000080852 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| C000080852 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000080852 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000080852 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000080852 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000080852 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000080850 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000080850 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.10% |
| C000080850 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| C000080850 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000080850 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| C000080850 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000080850 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| C000080850 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| C000080850 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000080850 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000080850 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000080850 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000080850 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000080851 [Member] | Energy Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5% |
| C000080851 [Member] | Financial Services Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 40.10% |
| C000080851 [Member] | Healthcare Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.20% |
| C000080851 [Member] | Real Estate Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000080851 [Member] | Technology Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| C000080851 [Member] | Communications Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.20% |
| C000080851 [Member] | Consumer Discretionary Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.60% |
| C000080851 [Member] | Consumer Staples Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.50% |
| C000080851 [Member] | Industrial Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.50% |
| C000080851 [Member] | Materials Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000080851 [Member] | Utilities Sector [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000080851 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.30% |
| C000080851 [Member] | US Government Corporations and Agencies Securities [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.60% |
| C000080861 [Member] | Ten To 20 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| C000080861 [Member] | Twenty To 30 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 82.10% |
| C000080861 [Member] | Thirty To 40 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000080861 [Member] | Zero To 10 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000080861 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000080859 [Member] | Ten To 20 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| C000080859 [Member] | Twenty To 30 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 82.10% |
| C000080859 [Member] | Thirty To 40 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000080859 [Member] | Zero To 10 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000080859 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000080860 [Member] | Ten To 20 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| C000080860 [Member] | Twenty To 30 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 82.10% |
| C000080860 [Member] | Thirty To 40 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000080860 [Member] | Zero To 10 Years [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.60% |
| C000080860 [Member] | Other Assets and Liabilities Net [Member] | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |