Shareholder Report, Average Annual Return (Details)
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12 Months Ended |
60 Months Ended |
120 Months Ended |
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
| C000012146 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Vanguard Variable Insurance Funds - Balanced Portfolio
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| C000012149 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Vanguard Variable Insurance Funds - Short-Term Investment-Grade Portfolio
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| C000012150 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Vanguard Variable Insurance Funds - Small Company Growth Portfolio
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| C000012151 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Vanguard Variable Insurance Funds - Total Bond Market Index Portfolio
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| C000012153 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Vanguard Variable Insurance Funds - Capital Growth Portfolio
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| C000012154 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Vanguard Variable Insurance Funds - Diversified Value Portfolio
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| C000012155 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Vanguard Variable Insurance Funds - Equity Income Portfolio
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| C000012157 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Vanguard Variable Insurance Funds - Growth Portfolio
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| C000012158 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Vanguard Variable Insurance Funds - High Yield Bond Portfolio
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| C000012159 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Vanguard Variable Insurance Funds - International Portfolio
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| Without Sales Load [Member] | C000012146 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
14.80%
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8.18%
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8.37%
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| Without Sales Load [Member] | C000012149 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.89%
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1.97%
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2.24%
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| Without Sales Load [Member] | C000012150 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
11.38%
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6.96%
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8.66%
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| Without Sales Load [Member] | C000012151 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
1.24%
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(0.39%)
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1.25%
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| Without Sales Load [Member] | C000012153 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
13.41%
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11.86%
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12.37%
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| Without Sales Load [Member] | C000012154 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
14.89%
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12.24%
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9.76%
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| Without Sales Load [Member] | C000012155 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
15.12%
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9.85%
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9.89%
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| Without Sales Load [Member] | C000012157 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
33.14%
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15.96%
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14.67%
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| Without Sales Load [Member] | C000012158 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
6.30%
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3.37%
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4.53%
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| Without Sales Load [Member] | C000012159 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
9.01%
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6.27%
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8.40%
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| NACC2 Index: Bloomberg U.S. Aggregate Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
1.25%
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(0.33%)
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1.35%
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| NACC2 Index: Bloomberg U.S. Aggregate Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
1.25%
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(0.33%)
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1.35%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
23.88%
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13.78%
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12.48%
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| NACC2 Index: Bloomberg U.S. Aggregate Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg U.S. Aggregate Float Adjusted Index
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| Average Annual Return, Percent |
1.33%
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(0.27%)
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1.39%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
23.88%
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13.78%
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12.48%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
23.88%
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13.78%
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12.48%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
23.88%
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13.78%
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12.48%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
23.88%
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13.78%
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12.48%
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| NACC2 Index: Bloomberg U.S. Aggregate Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
1.25%
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(0.33%)
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1.35%
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| NACC2 Index: MSCI All Country World Index ex USA |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
MSCI All Country World Index ex USA
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| Average Annual Return, Percent |
5.53%
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4.10%
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4.80%
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| NACC2 Index: Variable Insurance Balanced Composite Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Variable Insurance Balanced Composite Index
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| Average Annual Return, Percent |
16.35%
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9.48%
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9.29%
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| NACC2 Index: Dow Jones U.S. Total Stock Market Float Adjusted Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Dow Jones U.S. Total Stock Market Float Adjusted Index
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| Average Annual Return, Percent |
23.88%
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13.78%
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12.48%
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| NACC2 Index: Bloomberg U.S. 1-5 Year Credit Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg U.S. 1-5 Year Credit Bond Index
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| Average Annual Return, Percent |
4.72%
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1.85%
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2.28%
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| NACC2 Index: Russell 2500 Growth Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Russell 2500 Growth Index
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| Average Annual Return, Percent |
13.90%
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8.08%
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9.45%
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| NACC2 Index: S&P 500 Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P 500 Index
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| Average Annual Return, Percent |
25.02%
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14.53%
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13.10%
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| NACC2 Index: Russell 1000 Value Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Russell 1000 Value Index
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| Average Annual Return, Percent |
14.37%
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8.68%
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8.49%
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| NACC2 Index: FTSE High Dividend Yield Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
FTSE High Dividend Yield Index
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| Average Annual Return, Percent |
17.65%
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9.79%
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9.83%
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| NACC2 Index: Russell 1000 Growth Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Russell 1000 Growth Index
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| Average Annual Return, Percent |
33.36%
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18.96%
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16.78%
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| NACC2 Index: High-Yield Corporate Composite Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
High-Yield Corporate Composite Index
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| Average Annual Return, Percent |
6.59%
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3.76%
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4.79%
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| NACC2 Index: Bloomberg U.S. Corporate High Yield Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Bloomberg U.S. Corporate High Yield Bond Index
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| Average Annual Return, Percent |
8.19%
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4.21%
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5.17%
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