v3.26.3
S000045542 [Member] Expense Example - AB Small Cap Value Portfolio
Jun. 30, 2026
USD ($)
Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 541
Expense Example, with Redemption, 3 Years 787
Expense Example, with Redemption, 5 Years 1,052
Expense Example, with Redemption, 10 Years 1,807
Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 297 [1]
Expense Example, with Redemption, 3 Years 609
Expense Example, with Redemption, 5 Years 1,047
Expense Example, with Redemption, 10 Years 2,070
Advisor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 96
Expense Example, with Redemption, 3 Years 300
Expense Example, with Redemption, 5 Years 520
Expense Example, with Redemption, 10 Years $ 1,155
[1]
If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100.