AB Fixed Income Taxable Portfolio [Member] Shareholder Fees - AB Fixed-Income Taxable Portfolio - Intermediate Duration Portfolio - Class Z |
Mar. 31, 2025 |
|---|---|
| Prospectus [Line Items] | |
| Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) | 0.00% |
| Maximum Deferred Sales Charge (as a percentage) | 0.00% |