| Form N-CSR Cover | 12 Months Ended |
| May 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | AB MUNICIPAL INCOME FUND II |
| Entity Central Index Key | 0000899774 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | May 31, 2024 |
| Shareholder Report | 12 Months Ended | 38 Months Ended | 94 Months Ended |
| May 31, 2024 USD ($) Holding | May 31, 2024 USD ($) Holding | May 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |||
| Document Type | N-CSR | ||
| Amendment Flag | false | ||
| Registrant Name | AB MUNICIPAL INCOME FUND II | ||
| Entity Central Index Key | 0000899774 | ||
| Entity Investment Company Type | N-1A | ||
| Document Period End Date | May 31, 2024 | ||
| C000082954 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Arizona Portfolio | ||
| Class Name | Advisor Class | ||
| Trading Symbol | AAZYX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Arizona Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AAZYX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AAZYX-A</span>" id="sjs-B19"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AAZYX-A</span> | ||
| 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 $54 0.53% | ||
| Expenses Paid, Amount | $ 54 | ||
| Expense Ratio, Percent | 0.53% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, all share classes, except Class C, outperformed the Bloomberg Municipal Bond Index, before sales charges. Sector and security selection, as well as an overweight to credit contributed to performance, relative to the benchmark. Security selection within water and sewer and prepay energy contributed, while selection within miscellaneous revenue and not-for-profit health care detracted. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 Municipal Bond Index 03/21 $10,000 $10,000 05/21 $10,166 $10,121 05/22 $9,617 $9,433 05/23 $9,536 $9,479 05/24 $9,865 $9,733 | ||
| Average Annual Return [Table Text Block] | 1 Year Since Inception 3/24/21 Advisor Class (without sales charge) 3.45% - Advisor Class (with sales charge) 3.45% -0.42% Bloomberg Municipal Bond Index 2.67% - | ||
| Performance Inception Date | Mar. 24, 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 redemption of Fund shares. | ||
| AssetsNet | $ 80,415,523 | $ 80,415,523 | $ 80,415,523 |
| Holdings Count | Holding | 97 | 97 | 97 |
| Advisory Fees Paid, Amount | $ 128,253 | ||
| InvestmentCompanyPortfolioTurnover | 5% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $80,415,523 # of Portfolio Holdings 97 Portfolio Turnover Rate 5% Total Advisory Fees Paid $128,253 | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 6.2% AA 35.1% A 19.1% BBB 16.5% BB 7.2% B 0.3% CCC 1.4% Pre-refunded 5.8% Not Rated 8.4% * | ||
| Material Fund Change [Text Block] | |||
| C000028637 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Arizona Portfolio | ||
| Class Name | Class A | ||
| Trading Symbol | AAZAX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Arizona Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AAZAX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AAZAX-A</span>" id="sjs-B45"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AAZAX-A</span> | ||
| 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 $79 0.78% | ||
| Expenses Paid, Amount | $ 79 | ||
| Expense Ratio, Percent | 0.78% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, all share classes, except Class C, outperformed the Bloomberg Municipal Bond Index, before sales charges. Sector and security selection, as well as an overweight to credit contributed to performance, relative to the benchmark. Security selection within water and sewer and prepay energy contributed, while selection within miscellaneous revenue and not-for-profit health care detracted. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 Municipal Bond Index 05/14 $9,701 $10,000 05/15 $10,033 $10,318 05/16 $10,685 $10,924 05/17 $10,822 $11,083 05/18 $10,963 $11,207 05/19 $11,504 $11,925 05/20 $11,620 $12,399 05/21 $12,371 $12,986 05/22 $11,675 $12,104 05/23 $11,547 $12,163 05/24 $11,915 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class A (without sales charge) 3.18% 0.66% 2.08% Class A (with sales charge) 0.12% 0.04% 1.77% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 80,415,523 | $ 80,415,523 | $ 80,415,523 |
| Holdings Count | Holding | 97 | 97 | 97 |
| Advisory Fees Paid, Amount | $ 128,253 | ||
| InvestmentCompanyPortfolioTurnover | 5% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $80,415,523 # of Portfolio Holdings 97 Portfolio Turnover Rate 5% Total Advisory Fees Paid $128,253 | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 6.2% AA 35.1% A 19.1% BBB 16.5% BB 7.2% B 0.3% CCC 1.4% Pre-refunded 5.8% Not Rated 8.4% * | ||
| Material Fund Change [Text Block] | |||
| C000028639 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Arizona Portfolio | ||
| Class Name | Class C | ||
| Trading Symbol | AAZCX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Arizona Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AAZCX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AAZCX-A</span>" id="sjs-B70"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AAZCX-A</span> | ||
| 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 C $155 1.53% | ||
| Expenses Paid, Amount | $ 155 | ||
| Expense Ratio, Percent | 1.53% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, all share classes, except Class C, outperformed the Bloomberg Municipal Bond Index, before sales charges. Sector and security selection, as well as an overweight to credit contributed to performance, relative to the benchmark. Security selection within water and sewer and prepay energy contributed, while selection within miscellaneous revenue and not-for-profit health care detracted. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B75"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 C Bloomberg Municipal Bond Index 05/14 $10,000 $10,000 05/15 $10,260 $10,318 05/16 $10,856 $10,924 05/17 $10,904 $11,083 05/18 $10,963 $11,207 05/19 $11,427 $11,925 05/20 $11,449 $12,399 05/21 $12,099 $12,986 05/22 $11,341 $12,104 05/23 $11,134 $12,163 05/24 $11,392 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class C (without sales charge) 2.31% - 1.31% Class C (with sales charge) 1.31% -0.10% 1.31% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 80,415,523 | $ 80,415,523 | $ 80,415,523 |
| Holdings Count | Holding | 97 | 97 | 97 |
| Advisory Fees Paid, Amount | $ 128,253 | ||
| InvestmentCompanyPortfolioTurnover | 5% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $80,415,523 # of Portfolio Holdings 97 Portfolio Turnover Rate 5% Total Advisory Fees Paid $128,253 | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 6.2% AA 35.1% A 19.1% BBB 16.5% BB 7.2% B 0.3% CCC 1.4% Pre-refunded 5.8% Not Rated 8.4% * | ||
| Material Fund Change [Text Block] | |||
| C000082955 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Massachusetts Portfolio | ||
| Class Name | Advisor Class | ||
| Trading Symbol | AMAYX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Massachusetts Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AMAYX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AMAYX-A</span>" id="sjs-B95"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AMAYX-A</span> | ||
| 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 $53 0.52% | ||
| Expenses Paid, Amount | $ 53 | ||
| Expense Ratio, Percent | 0.52% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, all share classes, except Class C, outperformed the Bloomberg Municipal Bond Index, before sales charges. Security selection and an overweight to credit contributed to performance, relative to the benchmark. Security selection within private higher education and special tax contributed, while selection in the not-for-profit health care and utility Industrial Development Revenue (“IDR”) detracted. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which added to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B100"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 Municipal Bond Index 07/16 $10,000 $10,000 05/17 $9,952 $10,004 05/18 $10,052 $10,116 05/19 $10,529 $10,764 05/20 $10,770 $11,192 05/21 $10,569 $11,722 05/22 $10,830 $10,925 05/23 $10,787 $10,979 05/24 $11,095 $11,272 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years Since Inception 7/26/16 Advisor Class (without sales charge) 2.85% 1.00% 1.33% Advisor Class (with sales charge) 2.85% 1.00% 1.33% Bloomberg Municipal Bond Index 2.67% 0.93% 1.54% | ||
| Performance Inception Date | Jul. 26, 2016 | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 232,659,080 | $ 232,659,080 | $ 232,659,080 |
| Holdings Count | Holding | 141 | 141 | 141 |
| Advisory Fees Paid, Amount | $ 731,658 | ||
| InvestmentCompanyPortfolioTurnover | 15% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $232,659,080 # of Portfolio Holdings 141 Portfolio Turnover Rate 15% Total Advisory Fees Paid $731,658 | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 13.2% AA 36.7% A 17.4% BBB 19.2% BB 2.8% A-1+ 0.9% SP-1+ 0.4% SP-1 0.9% Pre-refunded 5.8% Not Rated 2.7% * | ||
| Material Fund Change [Text Block] | |||
| C000028643 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Massachusetts Portfolio | ||
| Class Name | Class A | ||
| Trading Symbol | AMAAX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Massachusetts Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AMAAX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AMAAX-A</span>" id="sjs-B121"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AMAAX-A</span> | ||
| 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 $78 0.77% | ||
| Expenses Paid, Amount | $ 78 | ||
| Expense Ratio, Percent | 0.77% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, all share classes, except Class C, outperformed the Bloomberg Municipal Bond Index, before sales charges. Security selection and an overweight to credit contributed to performance, relative to the benchmark. Security selection within private higher education and special tax contributed, while selection in the not-for-profit health care and utility Industrial Development Revenue (“IDR”) detracted. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which added to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B126"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 Municipal Bond Index 05/14 $9,702 $10,000 05/15 $10,005 $10,318 05/16 $10,544 $10,924 05/17 $10,626 $11,083 05/18 $10,705 $11,207 05/19 $11,186 $11,925 05/20 $11,401 $12,399 05/21 $12,217 $12,986 05/22 $11,407 $12,104 05/23 $11,333 $12,163 05/24 $11,638 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class A (without sales charge) 2.69% 0.75% 1.84% Class A (with sales charge) -0.40% 0.13% 1.53% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 232,659,080 | $ 232,659,080 | $ 232,659,080 |
| Holdings Count | Holding | 141 | 141 | 141 |
| Advisory Fees Paid, Amount | $ 731,658 | ||
| InvestmentCompanyPortfolioTurnover | 15% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $232,659,080 # of Portfolio Holdings 141 Portfolio Turnover Rate 15% Total Advisory Fees Paid $731,658 | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 13.2% AA 36.7% A 17.4% BBB 19.2% BB 2.8% A-1+ 0.9% SP-1+ 0.4% SP-1 0.9% Pre-refunded 5.8% Not Rated 2.7% * | ||
| Material Fund Change [Text Block] | |||
| C000028645 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Massachusetts Portfolio | ||
| Class Name | Class C | ||
| Trading Symbol | AMACX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Massachusetts Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AMACX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AMACX-A</span>" id="sjs-B146"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AMACX-A</span> | ||
| 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 C $153 1.52% | ||
| Expenses Paid, Amount | $ 153 | ||
| Expense Ratio, Percent | 1.52% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, all share classes, except Class C, outperformed the Bloomberg Municipal Bond Index, before sales charges. Security selection and an overweight to credit contributed to performance, relative to the benchmark. Security selection within private higher education and special tax contributed, while selection in the not-for-profit health care and utility Industrial Development Revenue (“IDR”) detracted. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which added to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B151"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 C Bloomberg Municipal Bond Index 05/14 $10,000 $10,000 05/15 $10,240 $10,318 05/16 $10,712 $10,924 05/17 $10,715 $11,083 05/18 $10,714 $11,207 05/19 $11,121 $11,925 05/20 $11,243 $12,399 05/21 $11,959 $12,986 05/22 $11,080 $12,104 05/23 $10,926 $12,163 05/24 $11,137 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class C (without sales charge) 1.92% - 1.08% Class C (with sales charge) 0.93% -0.01% 1.08% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 232,659,080 | $ 232,659,080 | $ 232,659,080 |
| Holdings Count | Holding | 141 | 141 | 141 |
| Advisory Fees Paid, Amount | $ 731,658 | ||
| InvestmentCompanyPortfolioTurnover | 15% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $232,659,080 # of Portfolio Holdings 141 Portfolio Turnover Rate 15% Total Advisory Fees Paid $731,658 | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 13.2% AA 36.7% A 17.4% BBB 19.2% BB 2.8% A-1+ 0.9% SP-1+ 0.4% SP-1 0.9% Pre-refunded 5.8% Not Rated 2.7% * | ||
| Material Fund Change [Text Block] | |||
| C000028649 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Minnesota Portfolio | ||
| Class Name | Class A | ||
| Trading Symbol | AMNAX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Minnesota Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AMNAX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AMNAX-A</span>" id="sjs-B171"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AMNAX-A</span> | ||
| 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 $86 0.85% | ||
| Expenses Paid, Amount | $ 86 | ||
| Expense Ratio, Percent | 0.85% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, both share classes underperformed the Bloomberg Municipal Bond Index, before sales charges. Sector and security selection detracted from overall performance, relative to the benchmark. Specifically, security selection within local general obligation and not-for-profit health care detracted, while selection within miscellaneous revenue and senior living contributed. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B176"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 Municipal Bond Index 05/14 $9,702 $10,000 05/15 $9,966 $10,318 05/16 $10,488 $10,924 05/17 $10,596 $11,083 05/18 $10,669 $11,207 05/19 $11,178 $11,925 05/20 $11,485 $12,399 05/21 $12,044 $12,986 05/22 $11,339 $12,104 05/23 $11,243 $12,163 05/24 $11,458 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class A (without sales charge) 1.92% 0.45% 1.68% Class A (with sales charge) -1.13% -0.16% 1.37% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 30,611,642 | $ 30,611,642 | $ 30,611,642 |
| Holdings Count | Holding | 42 | 42 | 42 |
| Advisory Fees Paid, Amount | $ (88,989) | ||
| InvestmentCompanyPortfolioTurnover | 4% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $30,611,642 # of Portfolio Holdings 42 Portfolio Turnover Rate 4% Total Advisory Fees Paid $(88,989) | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 10.4% AA 23.2% A 29.8% BBB 29.7% BB 2.3% Not Rated 4.6% * | ||
| Material Fund Change [Text Block] | |||
| C000028651 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Minnesota Portfolio | ||
| Class Name | Class C | ||
| Trading Symbol | AMNCX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Minnesota Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AMNCX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AMNCX-A</span>" id="sjs-B196"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AMNCX-A</span> | ||
| 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 C $161 1.60% | ||
| Expenses Paid, Amount | $ 161 | ||
| Expense Ratio, Percent | 1.60% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, both share classes underperformed the Bloomberg Municipal Bond Index, before sales charges. Sector and security selection detracted from overall performance, relative to the benchmark. Specifically, security selection within local general obligation and not-for-profit health care detracted, while selection within miscellaneous revenue and senior living contributed. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B201"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 C Bloomberg Municipal Bond Index 05/14 $10,000 $10,000 05/15 $10,198 $10,318 05/16 $10,652 $10,924 05/17 $10,681 $11,083 05/18 $10,674 $11,207 05/19 $11,117 $11,925 05/20 $11,318 $12,399 05/21 $11,779 $12,986 05/22 $11,007 $12,104 05/23 $10,832 $12,163 05/24 $10,956 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class C (without sales charge) 1.15% - 0.92% Class C (with sales charge) 0.15% -0.32% 0.92% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 30,611,642 | $ 30,611,642 | $ 30,611,642 |
| Holdings Count | Holding | 42 | 42 | 42 |
| Advisory Fees Paid, Amount | $ (88,989) | ||
| InvestmentCompanyPortfolioTurnover | 4% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $30,611,642 # of Portfolio Holdings 42 Portfolio Turnover Rate 4% Total Advisory Fees Paid $(88,989) | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 10.4% AA 23.2% A 29.8% BBB 29.7% BB 2.3% Not Rated 4.6% * | ||
| Material Fund Change [Text Block] | |||
| C000028652 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB New Jersey Portfolio | ||
| Class Name | Class A | ||
| Trading Symbol | ANJAX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB New Jersey Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/ANJAX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/ANJAX-A</span>" id="sjs-B221"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/ANJAX-A</span> | ||
| 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 $83 0.82% | ||
| Expenses Paid, Amount | $ 83 | ||
| Expense Ratio, Percent | 0.82% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, Class A outperformed the Bloomberg Municipal Bond Index, while Class C underperformed, before sales charges. Sector and security selection, as well as an overweight to credit contributed to performance, relative to the benchmark. Security selection within ports and water and sewer contributed, while selection within utility Industrial Development Revenue (“IDR”) and airline IDR detracted from overall performance. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B226"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 Municipal Bond Index 05/14 $9,704 $10,000 05/15 $9,899 $10,318 05/16 $10,520 $10,924 05/17 $10,711 $11,083 05/18 $10,887 $11,207 05/19 $11,459 $11,925 05/20 $11,547 $12,399 05/21 $12,557 $12,986 05/22 $11,840 $12,104 05/23 $11,905 $12,163 05/24 $12,239 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class A (without sales charge) 2.81% 1.27% 2.35% Class A (with sales charge) -0.28% 0.67% 2.04% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 63,272,727 | $ 63,272,727 | $ 63,272,727 |
| Holdings Count | Holding | 81 | 81 | 81 |
| Advisory Fees Paid, Amount | $ 38,715 | ||
| InvestmentCompanyPortfolioTurnover | 14% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $63,272,727 # of Portfolio Holdings 81 Portfolio Turnover Rate 14% Total Advisory Fees Paid $38,715 | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AA 39.0% A 30.2% BBB 22.8% BB 4.1% Not Rated 3.9% * | ||
| Material Fund Change [Text Block] | |||
| C000028654 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB New Jersey Portfolio | ||
| Class Name | Class C | ||
| Trading Symbol | ANJCX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB New Jersey Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/ANJCX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/ANJCX-A</span>" id="sjs-B246"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/ANJCX-A</span> | ||
| 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 C $159 1.57% | ||
| Expenses Paid, Amount | $ 159 | ||
| Expense Ratio, Percent | 1.57% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, Class A outperformed the Bloomberg Municipal Bond Index, while Class C underperformed, before sales charges. Sector and security selection, as well as an overweight to credit contributed to performance, relative to the benchmark. Security selection within ports and water and sewer contributed, while selection within utility Industrial Development Revenue (“IDR”) and airline IDR detracted from overall performance. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B251"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 C Bloomberg Municipal Bond Index 05/14 $10,000 $10,000 05/15 $10,119 $10,318 05/16 $10,672 $10,924 05/17 $10,796 $11,083 05/18 $10,891 $11,207 05/19 $11,384 $11,925 05/20 $11,379 $12,399 05/21 $12,268 $12,986 05/22 $11,491 $12,104 05/23 $11,455 $12,163 05/24 $11,701 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class C (without sales charge) 2.14% 0.51% 1.58% Class C (with sales charge) 1.15% 0.51% 1.58% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 63,272,727 | $ 63,272,727 | $ 63,272,727 |
| Holdings Count | Holding | 81 | 81 | 81 |
| Advisory Fees Paid, Amount | $ 38,715 | ||
| InvestmentCompanyPortfolioTurnover | 14% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $63,272,727 # of Portfolio Holdings 81 Portfolio Turnover Rate 14% Total Advisory Fees Paid $38,715 | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AA 39.0% A 30.2% BBB 22.8% BB 4.1% Not Rated 3.9% * | ||
| Material Fund Change [Text Block] | |||
| C000028655 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Ohio Portfolio | ||
| Class Name | Class A | ||
| Trading Symbol | AOHAX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Ohio Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AOHAX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AOHAX-A</span>" id="sjs-B271"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AOHAX-A</span> | ||
| 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 $82 0.81% | ||
| Expenses Paid, Amount | $ 82 | ||
| Expense Ratio, Percent | 0.81% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, Class A shares outperformed the Bloomberg Municipal Bond Index, while the Class C underperformed the benchmark, before sales charges. Sector and security selection, as well as an overweight to credit, contributed to performance, relative to the benchmark. Security selection within private higher education and miscellaneous revenue contributed, while selection within utility Industrial Development Revenue (“IDR”) and multi-family housing detracted. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B276"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 Municipal Bond Index 05/14 $9,697 $10,000 05/15 $9,991 $10,318 05/16 $10,619 $10,924 05/17 $10,757 $11,083 05/18 $10,819 $11,207 05/19 $11,313 $11,925 05/20 $11,506 $12,399 05/21 $12,357 $12,986 05/22 $11,611 $12,104 05/23 $11,514 $12,163 05/24 $11,908 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class A (without sales charge) 3.42% 0.98% 2.08% Class A (with sales charge) 0.35% 0.37% 1.76% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 43,760,522 | $ 43,760,522 | $ 43,760,522 |
| Holdings Count | Holding | 70 | 70 | 70 |
| Advisory Fees Paid, Amount | $ (46,474) | ||
| InvestmentCompanyPortfolioTurnover | 16% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $43,760,522 # of Portfolio Holdings 70 Portfolio Turnover Rate 16% Total Advisory Fees Paid $(46,474) | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 4.2% AA 24.0% A 30.0% BBB 28.8% BB 3.9% Not Rated 9.1% * | ||
| Material Fund Change [Text Block] | |||
| C000028657 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Ohio Portfolio | ||
| Class Name | Class C | ||
| Trading Symbol | AOHCX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Ohio Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AOHCX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AOHCX-A</span>" id="sjs-B296"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AOHCX-A</span> | ||
| 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 C $158 1.56% | ||
| Expenses Paid, Amount | $ 158 | ||
| Expense Ratio, Percent | 1.56% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, Class A shares outperformed the Bloomberg Municipal Bond Index, while the Class C underperformed the benchmark, before sales charges. Sector and security selection, as well as an overweight to credit, contributed to performance, relative to the benchmark. Security selection within private higher education and miscellaneous revenue contributed, while selection within utility Industrial Development Revenue (“IDR”) and multi-family housing detracted. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B301"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 C Bloomberg Municipal Bond Index 05/14 $10,000 $10,000 05/15 $10,230 $10,318 05/16 $10,793 $10,924 05/17 $10,851 $11,083 05/18 $10,843 $11,207 05/19 $11,261 $11,925 05/20 $11,360 $12,399 05/21 $12,109 $12,986 05/22 $11,280 $12,104 05/23 $11,102 $12,163 05/24 $11,396 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class C (without sales charge) 2.65% 0.20% 1.32% Class C (with sales charge) 1.65% 0.20% 1.32% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 43,760,522 | $ 43,760,522 | $ 43,760,522 |
| Holdings Count | Holding | 70 | 70 | 70 |
| Advisory Fees Paid, Amount | $ (46,474) | ||
| InvestmentCompanyPortfolioTurnover | 16% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $43,760,522 # of Portfolio Holdings 70 Portfolio Turnover Rate 16% Total Advisory Fees Paid $(46,474) | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 4.2% AA 24.0% A 30.0% BBB 28.8% BB 3.9% Not Rated 9.1% * | ||
| Material Fund Change [Text Block] | |||
| C000028658 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Pennsylvania Portfolio | ||
| Class Name | Class A | ||
| Trading Symbol | APAAX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Pennsylvania Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/APAAX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/APAAX-A</span>" id="sjs-B321"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/APAAX-A</span> | ||
| 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 $86 0.85% | ||
| Expenses Paid, Amount | $ 86 | ||
| 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 ended May 31, 2024, all share classes underperformed the Bloomberg Municipal Bond Index, before sales charges. Sector and security selection detracted, while an overweight to credit contributed to performance, relative to the benchmark. Security selection within utility Industrial Development Revenue ("IDR") and senior living detracted, while selection within private higher education and not-for-profit health care contributed. The Fund used derivatives for hedging purposes in the form interest rate swaps, which added for the 12-month period, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B326"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 Municipal Bond Index 05/14 $9,703 $10,000 05/15 $9,971 $10,318 05/16 $10,552 $10,924 05/17 $10,700 $11,083 05/18 $10,818 $11,207 05/19 $11,341 $11,925 05/20 $11,592 $12,399 05/21 $12,421 $12,986 05/22 $11,637 $12,104 05/23 $11,519 $12,163 05/24 $11,820 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class A (without sales charge) 2.61% 0.78% 1.99% Class A (with sales charge) -0.50% 0.16% 1.69% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 47,178,230 | $ 47,178,230 | $ 47,178,230 |
| Holdings Count | Holding | 75 | 75 | 75 |
| Advisory Fees Paid, Amount | $ (27,642) | ||
| InvestmentCompanyPortfolioTurnover | 19% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $47,178,230 # of Portfolio Holdings 75 Portfolio Turnover Rate 19% Total Advisory Fees Paid $(27,642) | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AA 33.5% A 31.2% BBB 13.7% BB 11.0% B 1.0% CCC 1.0% Pre-refunded 1.4% Not Rated 7.2% * | ||
| Material Fund Change [Text Block] | |||
| C000028660 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Pennsylvania Portfolio | ||
| Class Name | Class C | ||
| Trading Symbol | APACX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Pennsylvania Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/APACX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/APACX-A</span>" id="sjs-B346"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/APACX-A</span> | ||
| 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 C $162 1.60% | ||
| Expenses Paid, Amount | $ 162 | ||
| Expense Ratio, Percent | 1.60% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? During the 12-month period ended May 31, 2024, all share classes underperformed the Bloomberg Municipal Bond Index, before sales charges. Sector and security selection detracted, while an overweight to credit contributed to performance, relative to the benchmark. Security selection within utility Industrial Development Revenue ("IDR") and senior living detracted, while selection within private higher education and not-for-profit health care contributed. The Fund used derivatives for hedging purposes in the form interest rate swaps, which added for the 12-month period, and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B351"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 C Bloomberg Municipal Bond Index 05/14 $10,000 $10,000 05/15 $10,203 $10,318 05/16 $10,717 $10,924 05/17 $10,796 $11,083 05/18 $10,834 $11,207 05/19 $11,279 $11,925 05/20 $11,424 $12,399 05/21 $12,160 $12,986 05/22 $11,295 $12,104 05/23 $11,097 $12,163 05/24 $11,313 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class C (without sales charge) 1.95% 0.02% 1.24% Class C (with sales charge) 0.95% 0.02% 1.24% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 47,178,230 | $ 47,178,230 | $ 47,178,230 |
| Holdings Count | Holding | 75 | 75 | 75 |
| Advisory Fees Paid, Amount | $ (27,642) | ||
| InvestmentCompanyPortfolioTurnover | 19% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $47,178,230 # of Portfolio Holdings 75 Portfolio Turnover Rate 19% Total Advisory Fees Paid $(27,642) | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AA 33.5% A 31.2% BBB 13.7% BB 11.0% B 1.0% CCC 1.0% Pre-refunded 1.4% Not Rated 7.2% * | ||
| Material Fund Change [Text Block] | |||
| C000082961 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Virginia Portfolio | ||
| Class Name | Advisor Class | ||
| Trading Symbol | AVAYX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Virginia Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AVAYX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AVAYX-A</span>" id="sjs-B371"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AVAYX-A</span> | ||
| 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 $56 0.55% | ||
| Expenses Paid, Amount | $ 56 | ||
| Expense Ratio, Percent | 0.55% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, all share classes, except the Advisor class, underperformed the Bloomberg Municipal Bond Index, before sales charges. Sector and security selection, as well as credit contributed to performance, relative to the benchmark. Specifically, security selection within toll roads/transit and special tax contributed, while selection within ports and senior living detracted. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B376"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 Municipal Bond Index 07/16 $10,000 $10,000 05/17 $10,014 $10,004 05/18 $10,150 $10,116 05/19 $10,645 $10,764 05/20 $10,882 $11,192 05/21 $11,673 $11,722 05/22 $10,924 $10,925 05/23 $10,911 $10,979 05/24 $11,226 $11,272 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years Since Inception 7/26/16 Advisor Class (without sales charge) 2.89% 1.02% 1.48% Advisor Class (with sales charge) 2.89% 1.02% 1.48% Bloomberg Municipal Bond Index 2.67% 0.93% 1.54% | ||
| Performance Inception Date | Jul. 26, 2016 | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 191,595,197 | $ 191,595,197 | $ 191,595,197 |
| Holdings Count | Holding | 119 | 119 | 119 |
| Advisory Fees Paid, Amount | $ 716,706 | ||
| InvestmentCompanyPortfolioTurnover | 15% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $191,595,197 # of Portfolio Holdings 119 Portfolio Turnover Rate 15% Total Advisory Fees Paid $716,706 | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 7.7% AA 33.0% A 16.7% BBB 18.3% BB 2.9% B 1.5% A-1 0.8% Pre-refunded 13.0% Not Rated 6.1% * | ||
| Material Fund Change [Text Block] | |||
| C000028661 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Virginia Portfolio | ||
| Class Name | Class A | ||
| Trading Symbol | AVAAX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Virginia Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AVAAX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AVAAX-A</span>" id="sjs-B397"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AVAAX-A</span> | ||
| 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 $81 0.80% | ||
| Expenses Paid, Amount | $ 81 | ||
| Expense Ratio, Percent | 0.80% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, all share classes, except the Advisor class, underperformed the Bloomberg Municipal Bond Index, before sales charges. Sector and security selection, as well as credit contributed to performance, relative to the benchmark. Specifically, security selection within toll roads/transit and special tax contributed, while selection within ports and senior living detracted. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B402"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 Municipal Bond Index 05/14 $9,703 $10,000 05/15 $10,033 $10,318 05/16 $10,612 $10,924 05/17 $10,743 $11,083 05/18 $10,861 $11,207 05/19 $11,355 $11,925 05/20 $11,577 $12,399 05/21 $12,399 $12,986 05/22 $11,575 $12,104 05/23 $11,532 $12,163 05/24 $11,824 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class A (without sales charge) 2.53% 0.76% 2.00% Class A (with sales charge) -0.55% 0.15% 1.69% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 191,595,197 | $ 191,595,197 | $ 191,595,197 |
| Holdings Count | Holding | 119 | 119 | 119 |
| Advisory Fees Paid, Amount | $ 716,706 | ||
| InvestmentCompanyPortfolioTurnover | 15% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $191,595,197 # of Portfolio Holdings 119 Portfolio Turnover Rate 15% Total Advisory Fees Paid $716,706 | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 7.7% AA 33.0% A 16.7% BBB 18.3% BB 2.9% B 1.5% A-1 0.8% Pre-refunded 13.0% Not Rated 6.1% * | ||
| Material Fund Change [Text Block] | |||
| C000028663 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AB Virginia Portfolio | ||
| Class Name | Class C | ||
| Trading Symbol | AVACX | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about the AB Virginia Portfolio (the “Fund”) for the period of June 1, 2023 to May 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/AVACX-A | ||
| Additional Information Phone Number | (800) 227 4618 | ||
| Additional Information Website | https://www.abfunds.com/link/AB/AVACX-A</span>" id="sjs-B422"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 15.6px; margin: 0px; overflow: visible; text-align: left;">https://www.abfunds.com/link/AB/AVACX-A</span> | ||
| 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 C $156 1.55% | ||
| Expenses Paid, Amount | $ 156 | ||
| Expense Ratio, Percent | 1.55% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year? What affected the Fund’s performance? For the 12-month period, all share classes, except the Advisor class, underperformed the Bloomberg Municipal Bond Index, before sales charges. Sector and security selection, as well as credit contributed to performance, relative to the benchmark. Specifically, security selection within toll roads/transit and special tax contributed, while selection within ports and senior living detracted. The Fund used derivatives for hedging purposes in the form of interest rate swaps, which contributed to performance and Consumer Price Index swaps, which had no material impact on performance. | ||
| 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: 15.6px; 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-B427"><p style="line-height: 15.6px; box-sizing: border-box; color: rgb(0, 0, 0); display: block; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; 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: 15.6px; 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 C Bloomberg Municipal Bond Index 05/14 $10,000 $10,000 05/15 $10,269 $10,318 05/16 $10,782 $10,924 05/17 $10,834 $11,083 05/18 $10,871 $11,207 05/19 $11,290 $11,925 05/20 $11,428 $12,399 05/21 $12,139 $12,986 05/22 $11,245 $12,104 05/23 $11,119 $12,163 05/24 $11,327 $12,488 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years 10 Years Class C (without sales charge) 1.87% 0.03% 1.25% Class C (with sales charge) 0.87% 0.03% 1.25% Bloomberg Municipal Bond Index 2.67% 0.93% 2.25% | ||
| 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 redemption of Fund shares. | ||
| AssetsNet | $ 191,595,197 | $ 191,595,197 | $ 191,595,197 |
| Holdings Count | Holding | 119 | 119 | 119 |
| Advisory Fees Paid, Amount | $ 716,706 | ||
| InvestmentCompanyPortfolioTurnover | 15% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Net Assets $191,595,197 # of Portfolio Holdings 119 Portfolio Turnover Rate 15% Total Advisory Fees Paid $716,706 | ||
| Holdings [Text Block] | Credit Rating Breakdown Footnote Reference Value Value AAA 7.7% AA 33.0% A 16.7% BBB 18.3% BB 2.9% B 1.5% A-1 0.8% Pre-refunded 13.0% Not Rated 6.1% * | ||
| Material Fund Change [Text Block] |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | ||||||||||||
| May 31, 2024 | May 31, 2023 | May 31, 2022 | May 31, 2021 | Mar. 23, 2021 | May 31, 2020 | May 31, 2019 | May 31, 2018 | May 31, 2017 | Jul. 25, 2016 | May 31, 2016 | May 31, 2015 | May 31, 2014 | |
| C000082954 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Advisor Class | ||||||||||||
| Account Value | $ 9,865 | $ 9,536 | $ 9,617 | $ 10,166 | $ 10,000 | ||||||||
| C000028637 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class A | ||||||||||||
| Account Value | $ 11,915 | 11,547 | 11,675 | 12,371 | $ 11,620 | $ 11,504 | $ 10,963 | $ 10,822 | $ 10,685 | $ 10,033 | $ 9,701 | ||
| C000028639 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||
| Account Value | $ 11,392 | 11,134 | 11,341 | 12,099 | 11,449 | 11,427 | 10,963 | 10,904 | 10,856 | 10,260 | 10,000 | ||
| C000082955 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Advisor Class | ||||||||||||
| Account Value | $ 11,095 | 10,787 | 10,830 | 10,569 | 10,770 | 10,529 | 10,052 | 9,952 | $ 10,000 | ||||
| C000028643 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class A | ||||||||||||
| Account Value | $ 11,638 | 11,333 | 11,407 | 12,217 | 11,401 | 11,186 | 10,705 | 10,626 | 10,544 | 10,005 | 9,702 | ||
| C000028645 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||
| Account Value | $ 11,137 | 10,926 | 11,080 | 11,959 | 11,243 | 11,121 | 10,714 | 10,715 | 10,712 | 10,240 | 10,000 | ||
| C000028649 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class A | ||||||||||||
| Account Value | $ 11,458 | 11,243 | 11,339 | 12,044 | 11,485 | 11,178 | 10,669 | 10,596 | 10,488 | 9,966 | 9,702 | ||
| C000028651 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||
| Account Value | $ 10,956 | 10,832 | 11,007 | 11,779 | 11,318 | 11,117 | 10,674 | 10,681 | 10,652 | 10,198 | 10,000 | ||
| C000028652 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class A | ||||||||||||
| Account Value | $ 12,239 | 11,905 | 11,840 | 12,557 | 11,547 | 11,459 | 10,887 | 10,711 | 10,520 | 9,899 | 9,704 | ||
| C000028654 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||
| Account Value | $ 11,701 | 11,455 | 11,491 | 12,268 | 11,379 | 11,384 | 10,891 | 10,796 | 10,672 | 10,119 | 10,000 | ||
| C000028655 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class A | ||||||||||||
| Account Value | $ 11,908 | 11,514 | 11,611 | 12,357 | 11,506 | 11,313 | 10,819 | 10,757 | 10,619 | 9,991 | 9,697 | ||
| C000028657 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||
| Account Value | $ 11,396 | 11,102 | 11,280 | 12,109 | 11,360 | 11,261 | 10,843 | 10,851 | 10,793 | 10,230 | 10,000 | ||
| C000028658 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class A | ||||||||||||
| Account Value | $ 11,820 | 11,519 | 11,637 | 12,421 | 11,592 | 11,341 | 10,818 | 10,700 | 10,552 | 9,971 | 9,703 | ||
| C000028660 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||
| Account Value | $ 11,313 | 11,097 | 11,295 | 12,160 | 11,424 | 11,279 | 10,834 | 10,796 | 10,717 | 10,203 | 10,000 | ||
| C000082961 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Advisor Class | ||||||||||||
| Account Value | $ 11,226 | 10,911 | 10,924 | 11,673 | 10,882 | 10,645 | 10,150 | 10,014 | 10,000 | ||||
| C000028661 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class A | ||||||||||||
| Account Value | $ 11,824 | 11,532 | 11,575 | 12,399 | 11,577 | 11,355 | 10,861 | 10,743 | 10,612 | 10,033 | 9,703 | ||
| C000028663 | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Class C | ||||||||||||
| Account Value | $ 11,327 | 11,119 | 11,245 | 12,139 | 11,428 | 11,290 | 10,871 | 10,834 | 10,782 | 10,269 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 9,733 | 9,479 | 9,433 | 10,121 | $ 10,000 | ||||||||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 11,272 | 10,979 | 10,925 | 11,722 | 11,192 | 10,764 | 10,116 | 10,004 | 10,000 | ||||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 11,272 | 10,979 | 10,925 | 11,722 | 11,192 | 10,764 | 10,116 | 10,004 | $ 10,000 | ||||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | 12,163 | 12,104 | 12,986 | 12,399 | 11,925 | 11,207 | 11,083 | 10,924 | 10,318 | 10,000 | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||||||||||
| Account Value [Line Items] | |||||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||||
| Account Value | $ 12,488 | $ 12,163 | $ 12,104 | $ 12,986 | $ 12,399 | $ 11,925 | $ 11,207 | $ 11,083 | $ 10,924 | $ 10,318 | $ 10,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 38 Months Ended | 60 Months Ended | 94 Months Ended | 120 Months Ended |
| May 31, 2024 | May 31, 2024 | May 31, 2024 | May 31, 2024 | May 31, 2024 | |
| C000082954 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Advisor Class | ||||
| C000028637 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class A | ||||
| C000028639 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class C | ||||
| C000082955 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Advisor Class | ||||
| C000028643 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class A | ||||
| C000028645 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class C | ||||
| C000028649 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class A | ||||
| C000028651 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class C | ||||
| C000028652 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class A | ||||
| C000028654 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class C | ||||
| C000028655 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class A | ||||
| C000028657 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class C | ||||
| C000028658 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class A | ||||
| C000028660 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class C | ||||
| C000082961 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Advisor Class | ||||
| C000028661 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class A | ||||
| C000028663 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Class C | ||||
| Without Sales Load [Member] | C000082954 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 3.45% | (0.42%) | |||
| Without Sales Load [Member] | C000028637 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 3.18% | 0.66% | 2.08% | ||
| Without Sales Load [Member] | C000028639 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 2.31% | (0.10%) | 1.31% | ||
| Without Sales Load [Member] | C000082955 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 2.85% | 1% | 1.33% | ||
| Without Sales Load [Member] | C000028643 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 2.69% | 0.75% | 1.84% | ||
| Without Sales Load [Member] | C000028645 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 1.92% | (0.01%) | 1.08% | ||
| Without Sales Load [Member] | C000028649 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 1.92% | 0.45% | 1.68% | ||
| Without Sales Load [Member] | C000028651 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 1.15% | (0.32%) | 0.92% | ||
| Without Sales Load [Member] | C000028652 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 2.81% | 1.27% | 2.35% | ||
| Without Sales Load [Member] | C000028654 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 2.14% | 0.51% | 1.58% | ||
| Without Sales Load [Member] | C000028655 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 3.42% | 0.98% | 2.08% | ||
| Without Sales Load [Member] | C000028657 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 2.65% | 0.20% | 1.32% | ||
| Without Sales Load [Member] | C000028658 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 2.61% | 0.78% | 1.99% | ||
| Without Sales Load [Member] | C000028660 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 1.95% | 0.02% | 1.24% | ||
| Without Sales Load [Member] | C000082961 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 2.89% | 1.02% | 1.48% | ||
| Without Sales Load [Member] | C000028661 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 2.53% | 0.76% | 2% | ||
| Without Sales Load [Member] | C000028663 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 1.87% | 0.03% | 1.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | (0.85%) | |||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 1.54% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 1.54% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% | ||
| AllianceBernstein Index: Bloomberg Municipal Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||
| Average Annual Return, Percent | 2.67% | 0.93% | 2.25% |
| Shareholder Report, Holdings (Details) | May 31, 2024 |
| C000082954 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000082954 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.10% |
| C000082954 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| C000082954 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.50% |
| C000082954 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| C000082954 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000082954 | CCC | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000082954 | Pre-refunded | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000082954 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| C000028637 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000028637 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.10% |
| C000028637 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| C000028637 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.50% |
| C000028637 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| C000028637 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000028637 | CCC | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000028637 | Pre-refunded | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000028637 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| C000028639 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.20% |
| C000028639 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 35.10% |
| C000028639 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.10% |
| C000028639 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.50% |
| C000028639 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| C000028639 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.30% |
| C000028639 | CCC | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000028639 | Pre-refunded | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000028639 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8.40% |
| C000082955 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| C000082955 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.70% |
| C000082955 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.40% |
| C000082955 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.20% |
| C000082955 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000082955 | Pre-refunded | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000082955 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000082955 | A-1+ | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000082955 | SP-1+ | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000082955 | SP-1 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000028643 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| C000028643 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.70% |
| C000028643 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.40% |
| C000028643 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.20% |
| C000028643 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028643 | Pre-refunded | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000028643 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000028643 | A-1+ | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000028643 | SP-1+ | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000028643 | SP-1 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000028645 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.20% |
| C000028645 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 36.70% |
| C000028645 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 17.40% |
| C000028645 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 19.20% |
| C000028645 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000028645 | Pre-refunded | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000028645 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.70% |
| C000028645 | A-1+ | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000028645 | SP-1+ | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.40% |
| C000028645 | SP-1 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000028649 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| C000028649 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.20% |
| C000028649 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.80% |
| C000028649 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.70% |
| C000028649 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000028649 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000028651 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.40% |
| C000028651 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 23.20% |
| C000028651 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.80% |
| C000028651 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 29.70% |
| C000028651 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.30% |
| C000028651 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.60% |
| C000028652 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39% |
| C000028652 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 30.20% |
| C000028652 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.80% |
| C000028652 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000028652 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000028654 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 39% |
| C000028654 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 30.20% |
| C000028654 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 22.80% |
| C000028654 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.10% |
| C000028654 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000028655 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000028655 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24% |
| C000028655 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 30% |
| C000028655 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.80% |
| C000028655 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000028655 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| C000028657 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4.20% |
| C000028657 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 24% |
| C000028657 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 30% |
| C000028657 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 28.80% |
| C000028657 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000028657 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.10% |
| C000028658 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.50% |
| C000028658 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.20% |
| C000028658 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.70% |
| C000028658 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| C000028658 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000028658 | CCC | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000028658 | Pre-refunded | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000028658 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| C000028660 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33.50% |
| C000028660 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.20% |
| C000028660 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13.70% |
| C000028660 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11% |
| C000028660 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000028660 | CCC | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1% |
| C000028660 | Pre-refunded | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000028660 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.20% |
| C000082961 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| C000082961 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33% |
| C000082961 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.70% |
| C000082961 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.30% |
| C000082961 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000082961 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000082961 | Pre-refunded | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| C000082961 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| C000082961 | A-1 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028661 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| C000028661 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33% |
| C000028661 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.70% |
| C000028661 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.30% |
| C000028661 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000028661 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000028661 | Pre-refunded | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| C000028661 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| C000028661 | A-1 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
| C000028663 | AAA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.70% |
| C000028663 | AA | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 33% |
| C000028663 | A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 16.70% |
| C000028663 | BBB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.30% |
| C000028663 | BB | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.90% |
| C000028663 | B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.50% |
| C000028663 | Pre-refunded | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 13% |
| C000028663 | Not Rated | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.10% |
| C000028663 | A-1 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.80% |
