S000088374 [Member] Expense Example - AB Moderate Buffer ETF - AB Moderate Buffer ETF	Nov. 30, 2025 USD ($)
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 70
Expense Example, with Redemption, 3 Years	221
Expense Example, with Redemption, 5 Years	384
Expense Example, with Redemption, 10 Years	$ 859

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