Shareholder Report, Average Annual Return (Details)
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5 Months Ended |
12 Months Ended |
60 Months Ended |
120 Months Ended |
Jan. 31, 2026 |
Jan. 31, 2026 |
Jan. 31, 2026 |
Jan. 31, 2026 |
| C000007089 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Investor Shares
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| C000007092 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Investor Shares
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| C000007097 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Investor Shares
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| C000007099 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Investor Shares
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| C000007101 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Investor Shares
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| C000007103 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Investor Shares
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| C000007105 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Investor Shares
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| C000007107 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Investor Shares
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| C000007109 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Institutional Shares
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| C000151976 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Investor Shares
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| C000264003 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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ETF Shares Net Asset Value
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| Without Sales Load [Member] | C000007089 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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5.09%
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1.37%
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1.63%
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| Without Sales Load [Member] | C000007090 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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5.19%
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1.47%
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1.73%
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| Without Sales Load [Member] | C000007092 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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8.16%
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4.14%
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5.71%
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| Without Sales Load [Member] | C000007093 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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8.27%
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4.24%
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5.81%
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| Without Sales Load [Member] | C000007097 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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8.91%
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0.98%
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3.06%
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| Without Sales Load [Member] | C000007098 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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9.03%
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1.08%
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3.17%
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| Without Sales Load [Member] | C000007099 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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6.86%
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(0.08%)
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1.47%
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| Without Sales Load [Member] | C000007100 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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6.97%
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0.02%
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1.57%
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| Without Sales Load [Member] | C000007101 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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6.90%
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(3.11%)
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2.57%
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| Without Sales Load [Member] | C000007102 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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7.02%
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(3.01%)
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2.67%
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| Without Sales Load [Member] | C000007103 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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4.76%
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(6.69%)
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(0.57%)
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| Without Sales Load [Member] | C000007104 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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4.87%
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(6.59%)
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(0.47%)
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| Without Sales Load [Member] | C000007105 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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5.54%
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1.51%
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1.83%
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| Without Sales Load [Member] | C000007106 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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5.64%
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1.62%
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1.93%
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| Without Sales Load [Member] | C000007107 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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6.54%
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2.25%
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2.71%
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| Without Sales Load [Member] | C000007108 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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6.65%
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2.35%
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2.81%
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| Without Sales Load [Member] | C000007109 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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6.67%
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2.38%
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2.84%
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| Without Sales Load [Member] | C000151976 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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4.94%
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3.14%
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2.53%
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| Without Sales Load [Member] | C000151975 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
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5.10%
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3.25%
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2.63%
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| Without Sales Load [Member] | C000264003 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
2.18%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
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1.88%
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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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
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(0.20%)
|
1.88%
|
| 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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
|
(0.20%)
|
1.88%
|
| 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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
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6.85%
|
(0.20%)
|
1.88%
|
| 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 |
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Bloomberg U.S. Aggregate Bond Index
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| Average Annual Return, Percent |
0.69%
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| NACC2 Index: Bloomberg U.S. 1-5 Year Treasury Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. 1-5 Year Treasury Bond Index
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| Average Annual Return, Percent |
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5.44%
|
1.31%
|
1.72%
|
| NACC2 Index: Bloomberg U.S. 1-5 Year Treasury Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. 1-5 Year Treasury Bond Index
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| Average Annual Return, Percent |
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5.44%
|
1.31%
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1.72%
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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 |
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High-Yield Corporate Composite Index
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| Average Annual Return, Percent |
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7.77%
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4.06%
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6.10%
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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 |
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High-Yield Corporate Composite Index
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| Average Annual Return, Percent |
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7.77%
|
4.06%
|
6.10%
|
| NACC2 Index: Bloomberg U.S. 5-10 Year Credit Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. 5-10 Year Credit Bond Index
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| Average Annual Return, Percent |
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8.88%
|
0.92%
|
3.47%
|
| NACC2 Index: Bloomberg U.S. 5-10 Year Credit Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. 5-10 Year Credit Bond Index
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| Average Annual Return, Percent |
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8.88%
|
0.92%
|
3.47%
|
| NACC2 Index: Bloomberg U.S. 5-10 Year Treasury Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. 5-10 Year Treasury Bond Index
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| Average Annual Return, Percent |
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7.18%
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(0.77%)
|
1.31%
|
| NACC2 Index: Bloomberg U.S. 5-10 Year Treasury Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. 5-10 Year Treasury Bond Index
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| Average Annual Return, Percent |
|
7.18%
|
(0.77%)
|
1.31%
|
| NACC2 Index: Bloomberg U.S. Long Credit A or Better Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. Long Credit A or Better Bond Index
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| Average Annual Return, Percent |
|
7.09%
|
(3.15%)
|
2.45%
|
| NACC2 Index: Bloomberg U.S. Long Credit A or Better Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. Long Credit A or Better Bond Index
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| Average Annual Return, Percent |
|
7.09%
|
(3.15%)
|
2.45%
|
| NACC2 Index: Bloomberg U.S. Long Treasury Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. Long Treasury Bond Index
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| Average Annual Return, Percent |
|
4.66%
|
(6.64%)
|
(0.51%)
|
| NACC2 Index: Bloomberg U.S. Long Treasury Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. Long Treasury Bond Index
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| Average Annual Return, Percent |
|
4.66%
|
(6.64%)
|
(0.51%)
|
| NACC2 Index: Bloomberg U.S. 1-5 Year Government Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. 1-5 Year Government Bond Index
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| Average Annual Return, Percent |
|
5.44%
|
1.32%
|
1.72%
|
| NACC2 Index: Bloomberg U.S. 1-5 Year Government 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 Government Bond Index
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|
|
| Average Annual Return, Percent |
|
5.44%
|
1.32%
|
1.72%
|
| 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 |
|
6.46%
|
2.22%
|
2.82%
|
| 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
|
|
|
| Average Annual Return, Percent |
|
6.46%
|
2.22%
|
2.82%
|
| 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
|
|
|
| Average Annual Return, Percent |
|
6.46%
|
2.22%
|
2.82%
|
| NACC2 Index: Bloomberg U.S. Treasury Bellwethers: 1 Year Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. Treasury Bellwethers: 1 Year Index
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|
| Average Annual Return, Percent |
|
4.22%
|
2.90%
|
2.25%
|
| NACC2 Index: Bloomberg U.S. Treasury Bellwethers: 1 Year Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Bloomberg U.S. Treasury Bellwethers: 1 Year Index
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|
| Average Annual Return, Percent |
|
4.22%
|
2.90%
|
2.25%
|
| NACC2 Index: Bloomberg U.S. High Yield 2% Issuer Capped Total Return Index |
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| Average Annual Return [Line Items] |
|
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| Line Graph and Table Measure Name |
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Bloomberg U.S. High Yield 2% Issuer Capped Total Return Index
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| Average Annual Return, Percent |
1.85%
|
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