v3.25.4
AB Intermediate Municipal Portfolios [Member] Expense Example - AB Intermediate Municipal Portfolios - Diversified Municipal Portfolio
Sep. 30, 2025
USD ($)
AB Intermediate Diversified Municipal Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 491
Expense Example, with Redemption, 3 Years 630
Expense Example, with Redemption, 5 Years 782
Expense Example, with Redemption, 10 Years 1,224
AB Intermediate Diversified Municipal Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 245 [1]
Expense Example, with Redemption, 3 Years 449
Expense Example, with Redemption, 5 Years 776
Expense Example, with Redemption, 10 Years 1,497
Advisor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 43
Expense Example, with Redemption, 3 Years 135
Expense Example, with Redemption, 5 Years 235
Expense Example, with Redemption, 10 Years 530
AB Intermediate Diversified Municipal Class Z  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 41
Expense Example, with Redemption, 3 Years 128
Expense Example, with Redemption, 5 Years 224
Expense Example, with Redemption, 10 Years $ 505
[1]
If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100.