AB Fixed Income Taxable Portfolio [Member] Average Annual Total Returns - AB Fixed-Income Taxable Portfolio |
12 Months Ended | 60 Months Ended | 65 Months Ended | 120 Months Ended | ||
|---|---|---|---|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2024 |
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| Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 1.25% | (0.33%) | 1.35% | |||
| Class Z | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | [1] | 1.26% | (0.50%) | 1.40% | ||
| Performance Inception Date | [1] | Jul. 23, 2019 | ||||
| Class Z | After Taxes on Distributions | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | [1] | (0.49%) | (1.79%) | 0.07% | ||
| Performance Inception Date | [1] | Jul. 23, 2019 | ||||
| Class Z | After Taxes on Distributions and Sales | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | [1] | 0.74% | (0.85%) | 0.54% | ||
| Performance Inception Date | [1] | Jul. 23, 2019 | ||||
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