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S000076880 [Member] Average Annual Total Returns
 12 Months Ended 40 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)    
Prospectus [Line Items]    
Average Annual Return, Percent 7.30% 3.90% [1]
FTSE 3 Month US T-Bill Index (reflects no deduction for fees, expenses, or taxes)    
Prospectus [Line Items]    
Average Annual Return, Percent 4.40% 4.87% [1]
AB Ultra Short Income ETF    
Prospectus [Line Items]    
Average Annual Return, Percent 4.77% 5.18% [1]
Performance Inception Date   Sep. 14, 2022
AB Ultra Short Income ETF | After Taxes on Distributions    
Prospectus [Line Items]    
Average Annual Return, Percent [2] 2.94% 3.15% [1]
Performance Inception Date [2]   Sep. 14, 2022
AB Ultra Short Income ETF | After Taxes on Distributions and Sales    
Prospectus [Line Items]    
Average Annual Return, Percent [2] 2.80% 3.08% [1]
Performance Inception Date [2]   Sep. 14, 2022
[1]
Inception date is 9/14/22.
[2] After-tax returns: – Are an estimate, which is based on the highest historical individual federal marginal income tax rates, and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and – Are not relevant to investors who hold Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.