Core Bond Class [Member] Shareholder Fees - Core Bond Class - AB Core Bond Portfolio - Core Bond Class |
Sep. 30, 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% |
| Maximum Account Fee (as a percentage of Assets) | 0.00% |