v3.26.3
S000033729 [Member] Expense Example - AB Emerging Markets Multi-Asset Portfolio
Jun. 30, 2026
USD ($)
Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 547
Expense Example, with Redemption, 3 Years 888
Expense Example, with Redemption, 5 Years 1,252
Expense Example, with Redemption, 10 Years 2,274
Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 303 [1]
Expense Example, with Redemption, 3 Years 710
Expense Example, with Redemption, 5 Years 1,244
Expense Example, with Redemption, 10 Years 2,522
Advisor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 102
Expense Example, with Redemption, 3 Years 400
Expense Example, with Redemption, 5 Years 719
Expense Example, with Redemption, 10 Years 1,624
Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 102
Expense Example, with Redemption, 3 Years 419
Expense Example, with Redemption, 5 Years 758
Expense Example, with Redemption, 10 Years $ 1,717
[1]
If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100.