| Form N-CSR Cover | 12 Months Ended |
| Oct. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | AB BOND FUND, INC. |
| Entity Central Index Key | 0000003794 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| Shareholder Report | 12 Months Ended | 120 Months Ended |
| Oct. 31, 2024 USD ($) Holding | Oct. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | ||
| Document Type | N-CSR | |
| Amendment Flag | false | |
| Registrant Name | AB BOND FUND, INC. | |
| Entity Central Index Key | 0000003794 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Oct. 31, 2024 | |
| C000226939 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | AB Sustainable Thematic Credit Portfolio | |
| Class Name | Class A | |
| Trading Symbol | STHAX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Sustainable Thematic Credit Portfolio (the “Fund”) for the period of November 1, 2023 to October 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/STHAX-A. You can also request this information by contacting us at (800) 227 4618. | |
| Additional Information Phone Number | (800) 227 4618 | |
| Additional Information Website | https://www.abfunds.com/link/AB/STHAX-A | |
| Expenses [Text Block] | What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Class A $91 0.85% | |
| Expenses Paid, Amount | $ 91 | |
| Expense Ratio, Percent | 0.85% | |
| Factors Affecting Performance [Text Block] | How Did the Fund Perform Last Year? What Affected the Fund's Performance? During the 12-month period, all share classes outperformed the Bloomberg US Corporate Bond Index (the "benchmark”), before sales charges. Over the period, security selection among US investment-grade corporate bonds was the largest contributor to performance. Yield-curve positioning also contributed, mostly from overweights to the five- and 10-year parts of the US curve, which partially offset losses from being underweight to the two- and 20-year parts of the curve. Sector allocation and currency decisions did not impact performance results. The Fund used derivatives in the form of futures and currency forwards for hedging purposes; Treasury futures were utilized to manage duration, country exposure, and yield-curve positioning during the period; currency forwards were utilized to hedge currency risk during the period. | |
| Performance Past Does Not Indicate Future [Text] | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">The Fund’s past performance is not a good predictor of the Fund’s future performance.</span></p>" id="sjs-B24"><p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">The Fund’s past performance is not a good predictor of the Fund’s future performance.</span></p> | |
| Line Graph [Table Text Block] | Class A Bloomberg US Corporate Bond Index 05/21 $9,579 $10,000 10/21 $9,770 $10,246 10/22 $7,671 $8,241 10/23 $7,857 $8,469 10/24 $8,943 $9,623 | |
| Average Annual Return [Table Text Block] | Class Name 1 Year Since Inception 05/10/21 Class A (without sales charges) 13.83% - Class A (with sales charges) 8.99% - Bloomberg US Corporate Bond Index 13.63% - | |
| Performance Inception Date | May 10, 2021 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares. Visit https://www.abfunds.com/link/AB/STHAX-A for the most recent performance information. | |
| AssetsNet | $ 256,258,801 | $ 256,258,801 |
| Holdings Count | Holding | 396 | 396 |
| Advisory Fees Paid, Amount | $ 996,440 | |
| InvestmentCompanyPortfolioTurnover | 46% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $256,258,801 # of Portfolio Holdings 396 Portfolio Turnover Rate 46% Total Advisory Fees Paid $996,440 | |
| Holdings [Text Block] | Security Type Breakdown Value Value Corporates - Investment Grade 95.8% Emerging Markets - Corporate Bonds 1.0% Supranationals 0.5% Corporates - Non-Investment Grade 0.4% Quasi-Sovereigns 0.3% Governments - Sovereign Bonds 0.2% Local Governments - US Municipal Bonds 0.0% Short-Term Investments 0.9% Other Assets less Liabilities 0.9% | |
| Material Fund Change [Text Block] | ||
| C000226937 | ||
| Shareholder Report [Line Items] | ||
| Fund Name | AB Sustainable Thematic Credit Portfolio | |
| Class Name | Advisor Class | |
| Trading Symbol | STHYX | |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Sustainable Thematic Credit Portfolio (the “Fund”) for the period of November 1, 2023 to October 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.abfunds.com/link/AB/STHYX-A. You can also request this information by contacting us at (800) 227 4618. | |
| Additional Information Phone Number | (800) 227 4618 | |
| Additional Information Website | https://www.abfunds.com/link/AB/STHYX-A | |
| Expenses [Text Block] | What were the Fund costs for the last year? (Based on a hypothetical $10,000 investment) Class Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment Advisor Class $64 0.60% | |
| Expenses Paid, Amount | $ 64 | |
| Expense Ratio, Percent | 0.60% | |
| Factors Affecting Performance [Text Block] | How Did the Fund Perform Last Year? What Affected the Fund's Performance? During the 12-month period, all share classes outperformed the Bloomberg US Corporate Bond Index (the "benchmark”), before sales charges. Over the period, security selection among US investment-grade corporate bonds was the largest contributor to performance. Yield-curve positioning also contributed, mostly from overweights to the five- and 10-year parts of the US curve, which partially offset losses from being underweight to the two- and 20-year parts of the curve. Sector allocation and currency decisions did not impact performance results. The Fund used derivatives in the form of futures and currency forwards for hedging purposes; Treasury futures were utilized to manage duration, country exposure, and yield-curve positioning during the period; currency forwards were utilized to hedge currency risk during the period. | |
| Performance Past Does Not Indicate Future [Text] | <span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">The Fund’s past performance is not a good predictor of the Fund’s future performance.</span></p>" id="sjs-B50"><p style="box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;"><span style="font-weight: 700; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">The Fund’s past performance is not a good predictor of the Fund’s future performance.</span></p> | |
| Line Graph [Table Text Block] | Advisor Class Bloomberg US Corporate Bond Index 05/21 $10,000 $10,000 10/21 $10,212 $10,246 10/22 $8,038 $8,241 10/23 $8,253 $8,469 10/24 $9,418 $9,623 | |
| Average Annual Return [Table Text Block] | Class Name 1 Year Since Inception 05/10/21 Advisor Class 14.12% - Bloomberg US Corporate Bond Index 13.63% - | |
| Performance Inception Date | May 10, 2021 | |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption or sale of Fund shares. Visit https://www.abfunds.com/link/AB/STHYX-A for the most recent performance information. | |
| AssetsNet | $ 256,258,801 | $ 256,258,801 |
| Holdings Count | Holding | 396 | 396 |
| Advisory Fees Paid, Amount | $ 996,440 | |
| InvestmentCompanyPortfolioTurnover | 46% | |
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $256,258,801 # of Portfolio Holdings 396 Portfolio Turnover Rate 46% Total Advisory Fees Paid $996,440 | |
| Holdings [Text Block] | Security Type Breakdown Value Value Corporates - Investment Grade 95.8% Emerging Markets - Corporate Bonds 1.0% Supranationals 0.5% Corporates - Non-Investment Grade 0.4% Quasi-Sovereigns 0.3% Governments - Sovereign Bonds 0.2% Local Governments - US Municipal Bonds 0.0% Short-Term Investments 0.9% Other Assets less Liabilities 0.9% | |
| Material Fund Change [Text Block] |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | ||||
| Oct. 31, 2024 | Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021 | May 10, 2021 | |
| C000226939 | |||||
| Account Value [Line Items] | |||||
| Line Graph and Table Measure Name | Class A | ||||
| Account Value | $ 8,943 | $ 7,857 | $ 7,671 | $ 9,770 | $ 9,579 |
| C000226937 | |||||
| Account Value [Line Items] | |||||
| Line Graph and Table Measure Name | Advisor Class | ||||
| Account Value | $ 9,418 | 8,253 | 8,038 | 10,212 | 10,000 |
| Bloomberg US Corporate Bond Index | |||||
| Account Value [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg US Corporate Bond Index | ||||
| Account Value | $ 9,623 | 8,469 | 8,241 | 10,246 | 10,000 |
| Bloomberg US Corporate Bond Index | |||||
| Account Value [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg US Corporate Bond Index | ||||
| Account Value | $ 9,623 | $ 8,469 | $ 8,241 | $ 10,246 | $ 10,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 42 Months Ended |
| Oct. 31, 2024 | Oct. 31, 2024 | |
| C000226939 | ||
| Average Annual Return [Line Items] | ||
| Line Graph and Table Measure Name | Class A | |
| Average Annual Return, Percent | 8.99% | (3.16%) |
| C000226937 | ||
| Average Annual Return [Line Items] | ||
| Line Graph and Table Measure Name | Advisor Class | |
| Without Sales Load [Member] | C000226939 | ||
| Average Annual Return [Line Items] | ||
| Average Annual Return, Percent | 13.83% | (1.96%) |
| Without Sales Load [Member] | C000226937 | ||
| Average Annual Return [Line Items] | ||
| Average Annual Return, Percent | 14.12% | (1.71%) |
| Bloomberg US Corporate Bond Index | ||
| Average Annual Return [Line Items] | ||
| Line Graph and Table Measure Name | Bloomberg US Corporate Bond Index | |
| Average Annual Return, Percent | 13.63% | (1.10%) |
| Bloomberg US Corporate Bond Index | ||
| Average Annual Return [Line Items] | ||
| Line Graph and Table Measure Name | Bloomberg US Corporate Bond Index | |
| Average Annual Return, Percent | 13.63% | (1.10%) |
| Shareholder Report, Holdings (Details) | Oct. 31, 2024 |
| C000226939 | Other Assets and Liabilities Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000226939 | Short-Term Investments Asset Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000226939 | Short-Term Investments Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000226939 | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 71.70% |
| C000226939 | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000226939 | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000226939 | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000226939 | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000226939 | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000226939 | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000226939 | Ireland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000226939 | Chile | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000226939 | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000226939 | Peru | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000226939 | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| C000226939 | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000226939 | Corporates - Investment Grade | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.80% |
| C000226939 | Emerging Markets - Corporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000226939 | Supranationals | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000226939 | Corporates - Non-Investment Grade | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000226939 | Quasi-Sovereigns | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000226939 | Governments - Sovereign Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000226939 | Local Governments - US Municipal Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000226939 | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000226937 | Other Assets and Liabilities Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000226937 | Short-Term Investments Asset Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000226937 | Short-Term Investments Country Weighting | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000226937 | United States | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 71.70% |
| C000226937 | United Kingdom | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.30% |
| C000226937 | Canada | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000226937 | Germany | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000226937 | France | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000226937 | Spain | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000226937 | Italy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000226937 | Ireland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.90% |
| C000226937 | Chile | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000226937 | Brazil | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000226937 | Peru | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000226937 | Switzerland | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.70% |
| C000226937 | Netherlands | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000226937 | Corporates - Investment Grade | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 95.80% |
| C000226937 | Emerging Markets - Corporate Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000226937 | Supranationals | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.50% |
| C000226937 | Corporates - Non-Investment Grade | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000226937 | Quasi-Sovereigns | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000226937 | Governments - Sovereign Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.20% |
| C000226937 | Local Governments - US Municipal Bonds | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0% |
| C000226937 | Short-Term Investments | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
