S000027380 [Member] Investment Objectives and Goals - AB High Income Municipal Portfolio |
May 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | AB High Income Municipal Portfolio |
| Objective [Heading] | INVESTMENT OBJECTIVE: |
| Objective, Primary [Text Block] | The investment objective of the Portfolio is to earn the highest level of current income, exempt from federal income tax, that is available consistent with what the Adviser considers to be an appropriate level of risk.
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