S000027378 [Member] Performance Management - AB Bond Inflation Strategy |
Oct. 31, 2025 |
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| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | BAR CHART AND PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] |
The bar chart and performance information provide an indication of the historical risk of an investment in the Fund by showing:
You may obtain updated performance information on the website at www.abfunds.com (click on “Investments—Mutual Funds”) or, for Class 1 and Class 2 shares, at www.bernstein.com (click on “Investments—Mutual Fund Performance at a Glance”).
The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | how the Fund’s performance changed from year to year over ten years; andhow the Fund’s average annual returns for one, five and ten years compare to those of a broad-based securities market index and an additional index that more closely reflects the types of securities in which the Fund invests. | ||||||
| Bar Chart Narrative [Text Block] |
The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
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| Bar Chart Does Not Reflect Sales Loads [Text] | The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. | ||||||
| Bar Chart [Heading] | Bar Chart | ||||||
| Bar Chart Closing [Text Block] | Calendar Year End (%) During the period shown in the bar chart, the Fund’s: Best Quarter was up 7.40%, 2nd quarter, 2020; and Worst Quarter was down -5.00%, 1st quarter, 2020. | ||||||
| Performance Table Heading | Performance Table Average Annual Total Returns (For the periods ended December 31, 2025) | ||||||
| Performance Table Uses Highest Federal Rate | 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; | ||||||
| Performance Table Not Relevant to Tax Deferred | 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. | ||||||
| Performance Table One Class of after Tax Shown [Text] | After-tax returns:–Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; | ||||||
| Performance Availability Website Address [Text] | www.abfunds.com | ||||||
| Class A | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||
| Highest Quarterly Return | 7.40% | ||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||
| Lowest Quarterly Return | (5.00%) | ||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 |