The Fund is an actively-managed exchange-traded fund (“ETF”). The Fund pursues its objective by investing, under normal circumstances, at least 80% of its net assets, including any borrowings for investment purposes, in investment grade fixed-income securities of corporate issuers. Corporate issuers may include corporate or other business entities in which a sovereign or governmental agency or entity may have, indirectly or directly, an interest, including a majority or greater ownership interest. The Fund invests primarily in U.S. Dollar-denominated corporate debt securities issued by U.S. and foreign companies. These investments may include, in each case, developed and emerging market debt securities. The Fund may invest in debt securities of any maturity or duration.

The Adviser employs a systematic investment process using a dynamic multifactor approach. This approach, which is implemented by the Adviser through its proprietary research, investment and trading models and algorithms, considers a number of factors in seeking to generate alpha through a bottom-up security selection process. The factors that the Adviser considers in this regard fall into six broad proprietary categories—value, momentum, size, quality, carry, and volatility—with each category containing multiple factors. In making investment assessments, the Adviser considers a total factor score for each security and constructs a portfolio of securities taking into account other portfolio constraints and risks. This process also takes into account a security’s credit quality and sensitivity to interest rates.

The Fund expects to use derivatives, such as options, futures contracts, forwards and swaps. Derivatives may provide a more efficient and economical exposure to market segments than direct investments, and may also be a more efficient way to alter the Fund’s exposure. The Fund may, for example, use interest rate futures contracts or swaps to manage the Fund’s average duration. The Adviser may use derivatives to effectively leverage the Fund by creating aggregate market exposure significantly in excess of the Fund’s net assets.

S000082568 [Member] Investment Strategy - AB Corporate Bond ETF	Nov. 30, 2025
Prospectus [Line Items]
Strategy [Heading]	PRINCIPAL STRATEGIES
Strategy Narrative [Text Block]	The Fund is an actively-managed exchange-traded fund (“ETF”). The Fund pursues its objective by investing, under normal circumstances, at least 80% of its net assets, including any borrowings for investment purposes, in investment grade fixed-income securities of corporate issuers. Corporate issuers may include corporate or other business entities in which a sovereign or governmental agency or entity may have, indirectly or directly, an interest, including a majority or greater ownership interest. The Fund invests primarily in U.S. Dollar-denominated corporate debt securities issued by U.S. and foreign companies. These investments may include, in each case, developed and emerging market debt securities. The Fund may invest in debt securities of any maturity or duration. The Adviser employs a systematic investment process using a dynamic multifactor approach. This approach, which is implemented by the Adviser through its proprietary research, investment and trading models and algorithms, considers a number of factors in seeking to generate alpha through a bottom-up security selection process. The factors that the Adviser considers in this regard fall into six broad proprietary categories—value, momentum, size, quality, carry, and volatility—with each category containing multiple factors. In making investment assessments, the Adviser considers a total factor score for each security and constructs a portfolio of securities taking into account other portfolio constraints and risks. This process also takes into account a security’s credit quality and sensitivity to interest rates. The Fund may invest up to 10% of its net assets in debt securities rated below investment grade (“junk bonds”). The Fund expects to use derivatives, such as options, futures contracts, forwards and swaps. Derivatives may provide a more efficient and economical exposure to market segments than direct investments, and may also be a more efficient way to alter the Fund’s exposure. The Fund may, for example, use interest rate futures contracts or swaps to manage the Fund’s average duration. The Adviser may use derivatives to effectively leverage the Fund by creating aggregate market exposure significantly in excess of the Fund’s net assets.