Fixed Income SHares Series LD Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
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| Bloomberg U.S. Aggregate Index (reflects no deductions for fees, expenses or taxes)[Member] | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 7.30% | (0.36%) | 2.01% | ||
| ICE BofA 1-3 Year U.S. Treasury Index (reflects no deductions for fees, expenses or taxes)[Member] | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 5.10% | 1.79% | 1.85% | ||
| 50% ICE BofA 1-3 Yr U.S. Treasury Index/50% Bloomberg U.S. Intermediate Credit Index (reflects no deductions for fees, expenses or taxes)[Member] | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 6.48% | 1.68% | 2.50% | ||
| Series LD | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 6.05% | 2.64% | 3.21% | ||
| Series LD | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 3.92% | 1.08% | 1.54% | |
| Series LD | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | [1] | 3.55% | 1.34% | 1.72% | |
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