Shareholder Report
|
6 Months Ended |
|
Jun. 30, 2025
USD ($)
Holding
|
|---|
| Shareholder Report [Line Items] |
|
|
| Document Type |
N-CSRS
|
|
| Amendment Flag |
false
|
|
| Registrant Name |
Vanguard Bond Index Funds
|
|
| Entity Central Index Key |
0000794105
|
|
| Entity Investment Company Type |
N-1A
|
|
| Document Period End Date |
Jun. 30, 2025
|
|
| C000007057 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Intermediate-Term Bond Index Fund
|
|
| Class Name |
Investor Shares
|
|
| Trading Symbol |
VBIIX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Intermediate-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Investor Shares |
$8 |
0.15%1 |
|
|
| Expenses Paid, Amount |
$ 8
|
|
| Expense Ratio, Percent |
0.15%
|
[1] |
| Net Assets |
$ 45,084,000,000
|
|
| Holdings Count | Holding |
2,275
|
|
| Investment Company Portfolio Turnover |
33.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$45,084 |
| Number of Portfolio Holdings |
2,275 |
| Portfolio Turnover Rate |
33% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
36.7% |
| Sovereign Bonds |
4.7% |
| Taxable Municipal Bonds |
0.4% |
| U.S. Government and Agency Obligations |
57.3% |
| Other Assets and Liabilities—Net |
0.9% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000046841 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Intermediate-Term Bond Index Fund
|
|
| Class Name |
ETF Shares
|
|
| Trading Symbol |
BIV
|
|
| Security Exchange Name |
NYSEArca
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Intermediate-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| ETF Shares |
$2 |
0.03%1 |
|
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.03%
|
[2] |
| Net Assets |
$ 45,084,000,000
|
|
| Holdings Count | Holding |
2,275
|
|
| Investment Company Portfolio Turnover |
33.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$45,084 |
| Number of Portfolio Holdings |
2,275 |
| Portfolio Turnover Rate |
33% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
36.7% |
| Sovereign Bonds |
4.7% |
| Taxable Municipal Bonds |
0.4% |
| U.S. Government and Agency Obligations |
57.3% |
| Other Assets and Liabilities—Net |
0.9% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000007058 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Intermediate-Term Bond Index Fund
|
|
| Class Name |
Admiral™ Shares
|
|
| Trading Symbol |
VBILX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Intermediate-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Admiral Shares |
$3 |
0.06%1 |
|
|
| Expenses Paid, Amount |
$ 3
|
|
| Expense Ratio, Percent |
0.06%
|
[3] |
| Net Assets |
$ 45,084,000,000
|
|
| Holdings Count | Holding |
2,275
|
|
| Investment Company Portfolio Turnover |
33.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$45,084 |
| Number of Portfolio Holdings |
2,275 |
| Portfolio Turnover Rate |
33% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
36.7% |
| Sovereign Bonds |
4.7% |
| Taxable Municipal Bonds |
0.4% |
| U.S. Government and Agency Obligations |
57.3% |
| Other Assets and Liabilities—Net |
0.9% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000024520 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Intermediate-Term Bond Index Fund
|
|
| Class Name |
Institutional Shares
|
|
| Trading Symbol |
VBIMX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Intermediate-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Institutional Shares |
$2 |
0.04%1 |
|
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.04%
|
[4] |
| Net Assets |
$ 45,084,000,000
|
|
| Holdings Count | Holding |
2,275
|
|
| Investment Company Portfolio Turnover |
33.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$45,084 |
| Number of Portfolio Holdings |
2,275 |
| Portfolio Turnover Rate |
33% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
36.7% |
| Sovereign Bonds |
4.7% |
| Taxable Municipal Bonds |
0.4% |
| U.S. Government and Agency Obligations |
57.3% |
| Other Assets and Liabilities—Net |
0.9% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000105308 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Intermediate-Term Bond Index Fund
|
|
| Class Name |
Institutional Plus Shares
|
|
| Trading Symbol |
VBIUX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Intermediate-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Institutional Plus Shares |
$2 |
0.03%1 |
|
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.03%
|
[5] |
| Net Assets |
$ 45,084,000,000
|
|
| Holdings Count | Holding |
2,275
|
|
| Investment Company Portfolio Turnover |
33.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$45,084 |
| Number of Portfolio Holdings |
2,275 |
| Portfolio Turnover Rate |
33% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
36.7% |
| Sovereign Bonds |
4.7% |
| Taxable Municipal Bonds |
0.4% |
| U.S. Government and Agency Obligations |
57.3% |
| Other Assets and Liabilities—Net |
0.9% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000046842 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Long-Term Bond Index Fund
|
|
| Class Name |
ETF Shares
|
|
| Trading Symbol |
BLV
|
|
| Security Exchange Name |
NYSEArca
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Long-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| ETF Shares |
$2 |
0.03%1 |
|
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.03%
|
[6] |
| Net Assets |
$ 8,417,000,000
|
|
| Holdings Count | Holding |
3,039
|
|
| Investment Company Portfolio Turnover |
12.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$8,417 |
| Number of Portfolio Holdings |
3,039 |
| Portfolio Turnover Rate |
12% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
42.7% |
| Sovereign Bonds |
2.9% |
| Taxable Municipal Bonds |
1.9% |
| U.S. Government and Agency Obligations |
50.9% |
| Other Assets and Liabilities—Net |
1.6% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000209800 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Long-Term Bond Index Fund
|
|
| Class Name |
Admiral™ Shares
|
|
| Trading Symbol |
VBLAX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Long-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Admiral Shares |
$3 |
0.06%1 |
|
|
| Expenses Paid, Amount |
$ 3
|
|
| Expense Ratio, Percent |
0.06%
|
[7] |
| Net Assets |
$ 8,417,000,000
|
|
| Holdings Count | Holding |
3,039
|
|
| Investment Company Portfolio Turnover |
12.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$8,417 |
| Number of Portfolio Holdings |
3,039 |
| Portfolio Turnover Rate |
12% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
42.7% |
| Sovereign Bonds |
2.9% |
| Taxable Municipal Bonds |
1.9% |
| U.S. Government and Agency Obligations |
50.9% |
| Other Assets and Liabilities—Net |
1.6% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000024522 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Long-Term Bond Index Fund
|
|
| Class Name |
Institutional Shares
|
|
| Trading Symbol |
VBLLX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Long-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Institutional Shares |
$2 |
0.04%1 |
|
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.04%
|
[8] |
| Net Assets |
$ 8,417,000,000
|
|
| Holdings Count | Holding |
3,039
|
|
| Investment Company Portfolio Turnover |
12.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$8,417 |
| Number of Portfolio Holdings |
3,039 |
| Portfolio Turnover Rate |
12% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
42.7% |
| Sovereign Bonds |
2.9% |
| Taxable Municipal Bonds |
1.9% |
| U.S. Government and Agency Obligations |
50.9% |
| Other Assets and Liabilities—Net |
1.6% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000105309 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Long-Term Bond Index Fund
|
|
| Class Name |
Institutional Plus Shares
|
|
| Trading Symbol |
VBLIX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Long-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Institutional Plus Shares |
$2 |
0.03%1 |
|
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.03%
|
[9] |
| Net Assets |
$ 8,417,000,000
|
|
| Holdings Count | Holding |
3,039
|
|
| Investment Company Portfolio Turnover |
12.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$8,417 |
| Number of Portfolio Holdings |
3,039 |
| Portfolio Turnover Rate |
12% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
42.7% |
| Sovereign Bonds |
2.9% |
| Taxable Municipal Bonds |
1.9% |
| U.S. Government and Agency Obligations |
50.9% |
| Other Assets and Liabilities—Net |
1.6% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000007060 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Short-Term Bond Index Fund
|
|
| Class Name |
Investor Shares
|
|
| Trading Symbol |
VBISX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Short-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Investor Shares |
$8 |
0.15%1 |
|
|
| Expenses Paid, Amount |
$ 8
|
|
| Expense Ratio, Percent |
0.15%
|
[10] |
| Net Assets |
$ 64,146,000,000
|
|
| Holdings Count | Holding |
2,919
|
|
| Investment Company Portfolio Turnover |
30.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$64,146 |
| Number of Portfolio Holdings |
2,919 |
| Portfolio Turnover Rate |
30% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
25.3% |
| Sovereign Bonds |
4.7% |
| Taxable Municipal Bonds |
0.1% |
| U.S. Government and Agency Obligations |
68.6% |
| Other Assets and Liabilities—Net |
1.3% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000046843 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Short-Term Bond Index Fund
|
|
| Class Name |
ETF Shares
|
|
| Trading Symbol |
BSV
|
|
| Security Exchange Name |
NYSEArca
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Short-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| ETF Shares |
$2 |
0.03%1 |
|
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.03%
|
[11] |
| Net Assets |
$ 64,146,000,000
|
|
| Holdings Count | Holding |
2,919
|
|
| Investment Company Portfolio Turnover |
30.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$64,146 |
| Number of Portfolio Holdings |
2,919 |
| Portfolio Turnover Rate |
30% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
25.3% |
| Sovereign Bonds |
4.7% |
| Taxable Municipal Bonds |
0.1% |
| U.S. Government and Agency Obligations |
68.6% |
| Other Assets and Liabilities—Net |
1.3% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000007061 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Short-Term Bond Index Fund
|
|
| Class Name |
Admiral™ Shares
|
|
| Trading Symbol |
VBIRX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Short-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Admiral Shares |
$3 |
0.06%1 |
|
|
| Expenses Paid, Amount |
$ 3
|
|
| Expense Ratio, Percent |
0.06%
|
[12] |
| Net Assets |
$ 64,146,000,000
|
|
| Holdings Count | Holding |
2,919
|
|
| Investment Company Portfolio Turnover |
30.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$64,146 |
| Number of Portfolio Holdings |
2,919 |
| Portfolio Turnover Rate |
30% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
25.3% |
| Sovereign Bonds |
4.7% |
| Taxable Municipal Bonds |
0.1% |
| U.S. Government and Agency Obligations |
68.6% |
| Other Assets and Liabilities—Net |
1.3% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000105310 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Short-Term Bond Index Fund
|
|
| Class Name |
Institutional Shares
|
|
| Trading Symbol |
VBITX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Short-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Institutional Shares |
$2 |
0.04%1 |
|
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.04%
|
[13] |
| Net Assets |
$ 64,146,000,000
|
|
| Holdings Count | Holding |
2,919
|
|
| Investment Company Portfolio Turnover |
30.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$64,146 |
| Number of Portfolio Holdings |
2,919 |
| Portfolio Turnover Rate |
30% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
25.3% |
| Sovereign Bonds |
4.7% |
| Taxable Municipal Bonds |
0.1% |
| U.S. Government and Agency Obligations |
68.6% |
| Other Assets and Liabilities—Net |
1.3% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000105311 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Short-Term Bond Index Fund
|
|
| Class Name |
Institutional Plus Shares
|
|
| Trading Symbol |
VBIPX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Short-Term Bond Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Institutional Plus Shares |
$2 |
0.03%1 |
|
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.03%
|
[14] |
| Net Assets |
$ 64,146,000,000
|
|
| Holdings Count | Holding |
2,919
|
|
| Investment Company Portfolio Turnover |
30.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$64,146 |
| Number of Portfolio Holdings |
2,919 |
| Portfolio Turnover Rate |
30% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Corporate Bonds |
25.3% |
| Sovereign Bonds |
4.7% |
| Taxable Municipal Bonds |
0.1% |
| U.S. Government and Agency Obligations |
68.6% |
| Other Assets and Liabilities—Net |
1.3% |
| This table reflects the Fund’s investments, including short-term investments and other assets and liabilities. |
|
|
| C000007062 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Total Bond Market Index Fund
|
|
| Class Name |
Investor Shares
|
|
| Trading Symbol |
VBMFX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Total Bond Market Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Investor Shares |
$8 |
0.15%1 |
|
|
| Expenses Paid, Amount |
$ 8
|
|
| Expense Ratio, Percent |
0.15%
|
[15] |
| Net Assets |
$ 359,835,000,000
|
|
| Holdings Count | Holding |
17,695
|
|
| Investment Company Portfolio Turnover |
21.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$359,835 |
| Number of Portfolio Holdings |
17,695 |
| Portfolio Turnover Rate |
21% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Asset-Backed/Commercial Mortgage-Backed Securities |
2.1% |
| Corporate Bonds |
25.4% |
| Sovereign Bonds |
3.3% |
| Taxable Municipal Bonds |
0.5% |
| U.S. Government and Agency Obligations |
67.8% |
| Other Assets and Liabilities—Net |
0.9% |
| This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities. |
|
|
| C000046844 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Total Bond Market Index Fund
|
|
| Class Name |
ETF Shares
|
|
| Trading Symbol |
BND
|
|
| Security Exchange Name |
NASDAQ
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Total Bond Market Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| ETF Shares |
$2 |
0.03%1 |
|
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.03%
|
[16] |
| Net Assets |
$ 359,835,000,000
|
|
| Holdings Count | Holding |
17,695
|
|
| Investment Company Portfolio Turnover |
21.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$359,835 |
| Number of Portfolio Holdings |
17,695 |
| Portfolio Turnover Rate |
21% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Asset-Backed/Commercial Mortgage-Backed Securities |
2.1% |
| Corporate Bonds |
25.4% |
| Sovereign Bonds |
3.3% |
| Taxable Municipal Bonds |
0.5% |
| U.S. Government and Agency Obligations |
67.8% |
| Other Assets and Liabilities—Net |
0.9% |
| This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities. |
|
|
| C000007063 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Total Bond Market Index Fund
|
|
| Class Name |
Admiral™ Shares
|
|
| Trading Symbol |
VBTLX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Total Bond Market Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Admiral Shares |
$2 |
0.04%1 |
|
|
| Expenses Paid, Amount |
$ 2
|
|
| Expense Ratio, Percent |
0.04%
|
[17] |
| Net Assets |
$ 359,835,000,000
|
|
| Holdings Count | Holding |
17,695
|
|
| Investment Company Portfolio Turnover |
21.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$359,835 |
| Number of Portfolio Holdings |
17,695 |
| Portfolio Turnover Rate |
21% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Asset-Backed/Commercial Mortgage-Backed Securities |
2.1% |
| Corporate Bonds |
25.4% |
| Sovereign Bonds |
3.3% |
| Taxable Municipal Bonds |
0.5% |
| U.S. Government and Agency Obligations |
67.8% |
| Other Assets and Liabilities—Net |
0.9% |
| This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities. |
|
|
| C000007064 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Total Bond Market Index Fund
|
|
| Class Name |
Institutional Shares
|
|
| Trading Symbol |
VBTIX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Total Bond Market Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Institutional Shares |
$1 |
0.027%1 |
|
|
| Expenses Paid, Amount |
$ 1
|
|
| Expense Ratio, Percent |
0.027%
|
[18] |
| Net Assets |
$ 359,835,000,000
|
|
| Holdings Count | Holding |
17,695
|
|
| Investment Company Portfolio Turnover |
21.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$359,835 |
| Number of Portfolio Holdings |
17,695 |
| Portfolio Turnover Rate |
21% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Asset-Backed/Commercial Mortgage-Backed Securities |
2.1% |
| Corporate Bonds |
25.4% |
| Sovereign Bonds |
3.3% |
| Taxable Municipal Bonds |
0.5% |
| U.S. Government and Agency Obligations |
67.8% |
| Other Assets and Liabilities—Net |
0.9% |
| This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities. |
|
|
| C000081425 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Total Bond Market Index Fund
|
|
| Class Name |
Institutional Plus Shares
|
|
| Trading Symbol |
VBMPX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Total Bond Market Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Institutional Plus Shares |
$1 |
0.02%1 |
|
|
| Expenses Paid, Amount |
$ 1
|
|
| Expense Ratio, Percent |
0.02%
|
[19] |
| Net Assets |
$ 359,835,000,000
|
|
| Holdings Count | Holding |
17,695
|
|
| Investment Company Portfolio Turnover |
21.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$359,835 |
| Number of Portfolio Holdings |
17,695 |
| Portfolio Turnover Rate |
21% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Asset-Backed/Commercial Mortgage-Backed Securities |
2.1% |
| Corporate Bonds |
25.4% |
| Sovereign Bonds |
3.3% |
| Taxable Municipal Bonds |
0.5% |
| U.S. Government and Agency Obligations |
67.8% |
| Other Assets and Liabilities—Net |
0.9% |
| This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities. |
|
|
| C000170279 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Total Bond Market Index Fund
|
|
| Class Name |
Institutional Select Shares
|
|
| Trading Symbol |
VTBSX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Total Bond Market Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Institutional Select Shares |
$1 |
0.01%1 |
|
|
| Expenses Paid, Amount |
$ 1
|
|
| Expense Ratio, Percent |
0.01%
|
[20] |
| Net Assets |
$ 359,835,000,000
|
|
| Holdings Count | Holding |
17,695
|
|
| Investment Company Portfolio Turnover |
21.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$359,835 |
| Number of Portfolio Holdings |
17,695 |
| Portfolio Turnover Rate |
21% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Asset-Backed/Commercial Mortgage-Backed Securities |
2.1% |
| Corporate Bonds |
25.4% |
| Sovereign Bonds |
3.3% |
| Taxable Municipal Bonds |
0.5% |
| U.S. Government and Agency Obligations |
67.8% |
| Other Assets and Liabilities—Net |
0.9% |
| This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities. |
|
|
| C000054349 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Inflation-Protected Securities Fund
|
|
| Class Name |
Investor Shares
|
|
| Trading Symbol |
VIPSX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Inflation-Protected Securities Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Investor Shares |
$10 |
0.20%1 |
|
|
| Expenses Paid, Amount |
$ 10
|
|
| Expense Ratio, Percent |
0.20%
|
[21] |
| Net Assets |
$ 27,250,000,000
|
|
| Holdings Count | Holding |
77
|
|
| Investment Company Portfolio Turnover |
42.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$27,250 |
| Number of Portfolio Holdings |
77 |
| Portfolio Turnover Rate |
42% |
|
|
| Holdings [Text Block] |
Distribution by Stated Maturity % of Net Asset
(as of June 30, 2025) |
|
| 0 - 5 Years |
49.1% |
| 5 - 10 Years |
37.0% |
| 10 - 15 Years |
0.6% |
| 15 - 20 Years |
5.4% |
| 20 - 25 Years |
3.3% |
| Over 25 Years |
4.3% |
| Other Assets and Liabilities—Net |
0.3% |
| This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities. |
|
|
| C000054350 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Inflation-Protected Securities Fund
|
|
| Class Name |
Admiral™ Shares
|
|
| Trading Symbol |
VAIPX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Inflation-Protected Securities Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Admiral Shares |
$5 |
0.10%1 |
|
|
| Expenses Paid, Amount |
$ 5
|
|
| Expense Ratio, Percent |
0.10%
|
[22] |
| Net Assets |
$ 27,250,000,000
|
|
| Holdings Count | Holding |
77
|
|
| Investment Company Portfolio Turnover |
42.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$27,250 |
| Number of Portfolio Holdings |
77 |
| Portfolio Turnover Rate |
42% |
|
|
| Holdings [Text Block] |
Distribution by Stated Maturity % of Net Asset
(as of June 30, 2025) |
|
| 0 - 5 Years |
49.1% |
| 5 - 10 Years |
37.0% |
| 10 - 15 Years |
0.6% |
| 15 - 20 Years |
5.4% |
| 20 - 25 Years |
3.3% |
| Over 25 Years |
4.3% |
| Other Assets and Liabilities—Net |
0.3% |
| This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities. |
|
|
| C000054351 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Inflation-Protected Securities Fund
|
|
| Class Name |
Institutional Shares
|
|
| Trading Symbol |
VIPIX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Inflation-Protected Securities Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Institutional Shares |
$4 |
0.07%1 |
|
|
| Expenses Paid, Amount |
$ 4
|
|
| Expense Ratio, Percent |
0.07%
|
[23] |
| Net Assets |
$ 27,250,000,000
|
|
| Holdings Count | Holding |
77
|
|
| Investment Company Portfolio Turnover |
42.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$27,250 |
| Number of Portfolio Holdings |
77 |
| Portfolio Turnover Rate |
42% |
|
|
| Holdings [Text Block] |
Distribution by Stated Maturity % of Net Asset
(as of June 30, 2025) |
|
| 0 - 5 Years |
49.1% |
| 5 - 10 Years |
37.0% |
| 10 - 15 Years |
0.6% |
| 15 - 20 Years |
5.4% |
| 20 - 25 Years |
3.3% |
| Over 25 Years |
4.3% |
| Other Assets and Liabilities—Net |
0.3% |
| This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities. |
|
|
| C000075027 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Total Bond Market II Index Fund
|
|
| Class Name |
Investor Shares
|
|
| Trading Symbol |
VTBIX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Total Bond Market II Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Investor Shares |
$5 |
0.09%1 |
|
|
| Expenses Paid, Amount |
$ 5
|
|
| Expense Ratio, Percent |
0.09%
|
[24] |
| Net Assets |
$ 317,369,000,000
|
|
| Holdings Count | Holding |
16,031
|
|
| Investment Company Portfolio Turnover |
55.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$317,369 |
| Number of Portfolio Holdings |
16,031 |
| Portfolio Turnover Rate |
55% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Asset-Backed/Commercial Mortgage-Backed Securities |
2.0% |
| Corporate Bonds |
25.0% |
| Sovereign Bonds |
3.3% |
| Taxable Municipal Bonds |
0.5% |
| U.S. Government and Agency Obligations |
68.2% |
| Other Assets and Liabilities—Net |
1.0% |
| This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities. |
|
|
| C000075028 [Member] |
|
|
| Shareholder Report [Line Items] |
|
|
| Fund Name |
Vanguard Total Bond Market II Index Fund
|
|
| Class Name |
Institutional Shares
|
|
| Trading Symbol |
VTBNX
|
|
| Annual or Semi-Annual Statement [Text Block] |
This semi-annual shareholder report contains important information about Vanguard Total Bond Market II Index Fund (the "Fund") for the period of January 1, 2025, to June 30, 2025.
|
|
| Shareholder Report Annual or Semi-Annual |
semi-annual shareholder report
|
|
| Additional Information [Text Block] |
You can find additional information about the Fund at https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature. You can also request this information by contacting us at 800-662-7447.
|
|
| Additional Information Phone Number |
800-662-7447
|
|
| Additional Information Website |
https://personal1.vanguard.com/ngf-next-gen-form-webapp/fund-literature
|
|
| Expenses [Text Block] |
What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment)
| Share Class Name |
Costs of a $10,000 investment |
Costs paid as a percentage of a $10,000 investment |
| Institutional Shares |
$1 |
0.02%1 |
|
|
| Expenses Paid, Amount |
$ 1
|
|
| Expense Ratio, Percent |
0.02%
|
[25] |
| Net Assets |
$ 317,369,000,000
|
|
| Holdings Count | Holding |
16,031
|
|
| Investment Company Portfolio Turnover |
55.00%
|
|
| Additional Fund Statistics [Text Block] |
Fund Statistics
(as of June 30, 2025) |
|
Fund Net Assets
(in millions) |
$317,369 |
| Number of Portfolio Holdings |
16,031 |
| Portfolio Turnover Rate |
55% |
|
|
| Holdings [Text Block] |
Portfolio Composition % of Net Assets
(as of June 30, 2025) |
|
| Asset-Backed/Commercial Mortgage-Backed Securities |
2.0% |
| Corporate Bonds |
25.0% |
| Sovereign Bonds |
3.3% |
| Taxable Municipal Bonds |
0.5% |
| U.S. Government and Agency Obligations |
68.2% |
| Other Assets and Liabilities—Net |
1.0% |
| This table reflects the Fund’s investments, including short-term investments, derivatives and other assets and liabilities. |
|
|
|
|