v3.26.3
S000039195 [Member] Expense Example - AB Select US Long/Short Portfolio
Jun. 30, 2026
USD ($)
Advisor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 172
Expense Example, with Redemption, 3 Years 552
Expense Example, with Redemption, 5 Years 956
Expense Example, with Redemption, 10 Years 2,087
Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 614
Expense Example, with Redemption, 3 Years 1,026
Expense Example, with Redemption, 5 Years 1,464
Expense Example, with Redemption, 10 Years 2,676
Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 371 [1]
Expense Example, with Redemption, 3 Years 853
Expense Example, with Redemption, 5 Years 1,460
Expense Example, with Redemption, 10 Years 2,922
Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 166
Expense Example, with Redemption, 3 Years 533
Expense Example, with Redemption, 5 Years 925
Expense Example, with Redemption, 10 Years $ 2,023
[1]
If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100.