485BPOS

As filed with the Securities and Exchange Commission on February 21, 2013

File No. 33-60560

811-07618

SECURITIES AND EXCHANGE COMMISSION

Washington,  D.C.  20549

FORM N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933	¨
Pre-Effective Amendment No.	¨
Post-Effective Amendment No. 33	x

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940

Amendment No. 33 x

ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II

(Exact Name of Registrant as Specified in Charter)

1345 Avenue of the Americas,

New York, New York 10105

(Address of Principal Executive Office) (Zip Code)

Registrant’s Telephone Number, including Area Code:

(800) 221-5672

EMILIE D. WRAPP

AllianceBernstein L.P.

1345 Avenue of the Americas

New York, New York 10105

(Name and address of agent for service)

Copies of communications to:

KATHLEEN K. CLARKE

Seward & Kissel LLP

901 K Street, NW

Suite 800

Washington, DC 20001

It is proposed that this filing will become effective (check appropriate box)

¨ immediately upon filing pursuant to paragraph (b)

x on February 21, 2013 pursuant to paragraph (b)

¨ 60 days after filing pursuant to paragraph (a)(1)

¨ on (date) pursuant to paragraph (a)(1)

¨ 75 days after filing pursuant to paragraph (a)(2)

¨ on (date) pursuant to paragraph (a)(2) of Rule 485.

This Post-Effective Amendment No. 33 relates solely to the Class A, Class B and Class C shares, as applicable, of the Arizona Portfolio, Massachusetts Portfolio, Michigan Portfolio, Minnesota Portfolio, New Jersey Portfolio, Ohio Portfolio, Pennsylvania Portfolio and Virginia Portfolio. No information in the Registrant’s Registration Statement relating to the Advisor Class shares of the Arizona Portfolio, Massachusetts Portfolio, Michigan Portfolio, Minnesota Portfolio, New Jersey Portfolio, Ohio Portfolio, Pennsylvania Portfolio and Virginia Portfolio is amended or superseded.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this Amendment to its Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Post-Effective Amendment to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of New York and the State of New York, on the 21st day of February, 2013.

ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II
By:	Robert M. Keith*
	Robert M. Keith
	President

Pursuant to the requirements of the Securities Act of l933, this Post Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the dates indicated:

	SIGNATURE	TITLE	DATE
(1)	Principal Executive Officer:
	Robert M. Keith* Robert M. Keith	President and Chief Executive Officer	February 21, 2013
(2)	Principal Financial and Accounting Officer:
	/s/    Joseph J. Mantineo Joseph J. Mantineo	Treasurer and Chief Financial Officer	February 21, 2013
	Trustees:
	John H. Dobkin* Michael J. Downey* William H. Foulk, Jr.* D. James Guzy* Nancy P. Jacklin* Robert M. Keith* Garry L. Moody* Marshall C. Turner, Jr.* Earl D. Weiner*
*By:	/s/    Emilie D. Wrapp Emilie D. Wrapp (Attorney-in-fact)		February 21, 2013

Index to Exhibits

Exhibit No.	Description of Exhibits
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CALC	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Minnesota Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	MINNESOTA PORTFOLIO
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and State of Minnesota personal income tax that is available without assuming what the Adviser considers to be undue risk.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE PORTFOLIO:
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 14% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	14.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year. For Class C shares, the CDSC is 0% after the first year.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLES
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Minnesota or municipal securities with interest that is otherwise exempt from Minnesota state income tax. The Portfolio may also invest in: forward commitments; zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and derivatives, such as options, futures, forwards and swaps.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations. MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Minnesota municipal securities may be vulnerable to events adversely affecting its economy. Minnesota's economy is diverse, but there are employment concentrations in the fabricated metals, machinery, computers and electronics categories of the durable goods manufacturing sector, which are vulnerable during general economic downturns. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities. TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield. INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%. INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities. LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets. DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments. MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. As with all investments, you may lose money by investing in the Portfolio.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Portfolio.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	BAR CHART AND PERFORMANCE INFORMATION:
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing: how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index. You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance"). The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.AllianceBernstein.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	BAR CHART
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Portfolio's: BEST QUARTER WAS UP 6.19%, 1ST QUARTER, 2009; AND WORST QUARTER WAS DOWN -4.03%, 4TH QUARTER, 2010.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2012)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios
Minnesota Portfolio | CLASS A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.00%
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.04%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.22%
Other Expenses: Interest Expense	rr_Component3OtherExpensesOverAssets	0.01%
Total Other Expenses	rr_OtherExpensesOverAssets	0.27%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.02%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.11%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	0.91%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	390
After 3 Years	rr_ExpenseExampleYear03	604
After 5 Years	rr_ExpenseExampleYear05	835
After 10 Years	rr_ExpenseExampleYear10	1,500
2003	rr_AnnualReturn2003	5.60%
2004	rr_AnnualReturn2004	4.22%
2005	rr_AnnualReturn2005	4.10%
2006	rr_AnnualReturn2006	4.36%
2007	rr_AnnualReturn2007	2.87%
2008	rr_AnnualReturn2008	(3.55%)
2009	rr_AnnualReturn2009	11.66%
2010	rr_AnnualReturn2010	1.25%
2011	rr_AnnualReturn2011	10.39%
2012	rr_AnnualReturn2012	5.65%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	6.19%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(4.03%)
1 YEAR	rr_AverageAnnualReturnYear01	2.52%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.29%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.26%	[5]
Minnesota Portfolio | CLASS B
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	3.00%	[6]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.26%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.23%
Other Expenses: Interest Expense	rr_Component3OtherExpensesOverAssets	none
Total Other Expenses	rr_OtherExpensesOverAssets	0.49%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.94%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.33%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.61%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	463
After 3 Years	rr_ExpenseExampleYear03	676
After 5 Years	rr_ExpenseExampleYear05	1,013
After 10 Years	rr_ExpenseExampleYear10	1,772
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	163
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	576
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,013
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,772
1 YEAR	rr_AverageAnnualReturnYear01	1.92%
5 YEARS	rr_AverageAnnualReturnYear05	4.22%
10 YEARS	rr_AverageAnnualReturnYear10	4.14%
Minnesota Portfolio | CLASS C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[7]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.04%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.22%
Other Expenses: Interest Expense	rr_Component3OtherExpensesOverAssets	0.01%
Total Other Expenses	rr_OtherExpensesOverAssets	0.27%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.72%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.11%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.61%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	264
After 3 Years	rr_ExpenseExampleYear03	531
After 5 Years	rr_ExpenseExampleYear05	922
After 10 Years	rr_ExpenseExampleYear10	2,019
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	164
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	531
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	922
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,019
1 YEAR	rr_AverageAnnualReturnYear01	3.91%
5 YEARS	rr_AverageAnnualReturnYear05	4.21%
10 YEARS	rr_AverageAnnualReturnYear10	3.85%
Minnesota Portfolio | Return After Taxes on Distributions | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	2.43%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.25%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.23%	[5]
Minnesota Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	2.81%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.15%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.17%	[5]
Minnesota Portfolio | Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	6.78%
5 YEARS	rr_AverageAnnualReturnYear05	5.91%
10 YEARS	rr_AverageAnnualReturnYear10	5.10%

[1] Including Interest Expense Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] If interest expense were excluded, net expenses would be as follows: CLASS A CLASS C ADVISOR CLASS 0.90% 1.60% 1.60%.

[4] Including Interest Expense After Fee Waiver and/or Expense Reimbursement

[5] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

[6] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[7] For Class C shares, the CDSC is 0% after the first year.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Pennsylvania Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	PENNSYLVANIA PORTFOLIO
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and Commonwealth of Pennsylvania personal income tax that is available without assuming what the Adviser considers to be undue risk.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE PORTFOLIO:
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 20% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	20.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year. For Class C shares, the CDSC is 0% after the first year.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Restated to reflect current fee waiver and/or expense reimbursement.
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLES
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Pennsylvania or municipal securities with interest that is otherwise exempt from Pennsylvania state income tax. The Portfolio may also invest in: forward commitments; zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and derivatives, such as options, futures, forwards and swaps.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations. MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Pennsylvania municipal securities may be vulnerable to events adversely affecting its economy. Pennsylvania's economy has become more diverse, shifting from the coal, steel, and railroad industries. While the services sector is growing, the state is still relatively more dependent upon manufacturing and is vulnerable to business downturns and decreased capital spending. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities. TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield. INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%. INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities. LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets. DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments. MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. As with all investments, you may lose money by investing in the Portfolio.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Portfolio.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	BAR CHART AND PERFORMANCE INFORMATION:
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing: how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index. You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance"). The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.AllianceBernstein.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	BAR CHART
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Portfolio's: BEST QUARTER WAS UP 6.86%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -4.16%, 4TH QUARTER, 2008.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2012)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios
Pennsylvania Portfolio | CLASS A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.00%
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.04%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.20%
Total Other Expenses	rr_OtherExpensesOverAssets	0.24%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	0.99%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.09%)	[2],[3]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	0.90%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	389
After 3 Years	rr_ExpenseExampleYear03	597
After 5 Years	rr_ExpenseExampleYear05	822
After 10 Years	rr_ExpenseExampleYear10	1,468
2003	rr_AnnualReturn2003	5.94%
2004	rr_AnnualReturn2004	4.58%
2005	rr_AnnualReturn2005	3.96%
2006	rr_AnnualReturn2006	4.89%
2007	rr_AnnualReturn2007	2.23%
2008	rr_AnnualReturn2008	(7.49%)
2009	rr_AnnualReturn2009	14.44%
2010	rr_AnnualReturn2010	3.46%
2011	rr_AnnualReturn2011	9.77%
2012	rr_AnnualReturn2012	6.51%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	6.86%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(4.16%)
1 YEAR	rr_AverageAnnualReturnYear01	3.28%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.44%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.38%	[5]
Pennsylvania Portfolio | CLASS B
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	3.00%	[6]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.06%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.20%
Total Other Expenses	rr_OtherExpensesOverAssets	0.26%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.71%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.11%)	[2],[3]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.60%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	463
After 3 Years	rr_ExpenseExampleYear03	628
After 5 Years	rr_ExpenseExampleYear05	917
After 10 Years	rr_ExpenseExampleYear10	1,642
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	163
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	528
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	917
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,642
1 YEAR	rr_AverageAnnualReturnYear01	2.78%
5 YEARS	rr_AverageAnnualReturnYear05	4.35%
10 YEARS	rr_AverageAnnualReturnYear10	4.26%
Pennsylvania Portfolio | CLASS C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[7]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.05%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.19%
Total Other Expenses	rr_OtherExpensesOverAssets	0.24%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.69%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.09%)	[2],[3]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.60%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	263
After 3 Years	rr_ExpenseExampleYear03	523
After 5 Years	rr_ExpenseExampleYear05	909
After 10 Years	rr_ExpenseExampleYear10	1,989
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	163
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	523
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	909
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,989
1 YEAR	rr_AverageAnnualReturnYear01	4.77%
5 YEARS	rr_AverageAnnualReturnYear05	4.34%
10 YEARS	rr_AverageAnnualReturnYear10	3.96%
Pennsylvania Portfolio | Return After Taxes on Distributions | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	3.12%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.36%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.33%	[5]
Pennsylvania Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	3.45%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.32%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.30%	[5]
Pennsylvania Portfolio | Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	6.78%
5 YEARS	rr_AverageAnnualReturnYear05	5.91%
10 YEARS	rr_AverageAnnualReturnYear10	5.10%

[1] Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] Restated to reflect current fee waiver and/or expense reimbursement.

[4] After Fee Waiver and/or Expense Reimbursement

[5] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

[6] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[7] For Class C shares, the CDSC is 0% after the first year.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Michigan Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	MICHIGAN PORTFOLIO
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and State of Michigan personal income tax that is available without assuming what the Adviser considers to be undue risk.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE PORTFOLIO:
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 28% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	28.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year. For Class C shares, the CDSC is 0% after the first year.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Restated to reflect current fee waiver and/or expense reimbursement.
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLES
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Michigan or municipal securities with interest that is otherwise exempt from Michigan state income tax. The Portfolio may also invest in: forward commitments; zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and derivatives, such as options, futures, forwards and swaps.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations. MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Michigan municipal securities may be vulnerable to events adversely affecting its economy. Michigan's economy has recently become more diverse but is still heavily dependent on manufacturing, particularly the automobile and automobile parts industry. The automobile industry recently suffered severe reductions in purchases of automobiles, which led to bankruptcy filings for two of the largest automobile manufacturers and required U.S. Government support. The automobile industry has since recovered and these companies have successfully emerged from bankruptcy. However, other economic conditions continue to adversely affect the state's economy and employment rates. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities. TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield. INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities. DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%. LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets. DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments. MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. As with all investments, you may lose money by investing in the Portfolio.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Portfolio.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	BAR CHART AND PERFORMANCE INFORMATION:
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing: how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index. You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance"). The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.AllianceBernstein.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	BAR CHART
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Portfolio's: BEST QUARTER WAS UP 4.90%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -2.88%, 3RD QUARTER, 2008.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2012)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios;
Michigan Portfolio | CLASS A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.00%
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.06%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.24%
Total Other Expenses	rr_OtherExpensesOverAssets	0.30%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.05%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.15%)	[2],[3]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	0.90%	[2],[4]
After 1 Year	rr_ExpenseExampleYear01	389
After 3 Years	rr_ExpenseExampleYear03	609
After 5 Years	rr_ExpenseExampleYear05	847
After 10 Years	rr_ExpenseExampleYear10	1,529
2003	rr_AnnualReturn2003	4.63%
2004	rr_AnnualReturn2004	5.39%
2005	rr_AnnualReturn2005	4.31%
2006	rr_AnnualReturn2006	4.57%
2007	rr_AnnualReturn2007	2.72%
2008	rr_AnnualReturn2008	(4.20%)
2009	rr_AnnualReturn2009	12.53%
2010	rr_AnnualReturn2010	2.31%
2011	rr_AnnualReturn2011	7.16%
2012	rr_AnnualReturn2012	5.18%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	4.90%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(2.88%)
1 YEAR	rr_AverageAnnualReturnYear01	2.06%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	3.82%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.07%	[5]
Michigan Portfolio | CLASS B
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	3.00%	[6]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.08%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.25%
Total Other Expenses	rr_OtherExpensesOverAssets	0.33%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.78%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.18%)	[2],[3]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.60%	[2],[4]
After 1 Year	rr_ExpenseExampleYear01	463
After 3 Years	rr_ExpenseExampleYear03	642
After 5 Years	rr_ExpenseExampleYear05	946
After 10 Years	rr_ExpenseExampleYear10	1,708
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	163
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	542
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	946
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,708
1 YEAR	rr_AverageAnnualReturnYear01	1.47%
5 YEARS	rr_AverageAnnualReturnYear05	3.74%
10 YEARS	rr_AverageAnnualReturnYear10	3.95%
Michigan Portfolio | CLASS C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[7]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.06%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.25%
Total Other Expenses	rr_OtherExpensesOverAssets	0.31%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.76%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.16%)	[2],[3]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.60%	[2],[4]
After 1 Year	rr_ExpenseExampleYear01	263
After 3 Years	rr_ExpenseExampleYear03	538
After 5 Years	rr_ExpenseExampleYear05	938
After 10 Years	rr_ExpenseExampleYear10	2,057
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	163
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	538
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	938
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,057
1 YEAR	rr_AverageAnnualReturnYear01	3.46%
5 YEARS	rr_AverageAnnualReturnYear05	3.73%
10 YEARS	rr_AverageAnnualReturnYear10	3.68%
Michigan Portfolio | Return After Taxes on Distributions | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	1.86%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	3.73%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.00%	[5]
Michigan Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	2.72%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	3.76%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.02%	[5]
Michigan Portfolio | Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	6.78%
5 YEARS	rr_AverageAnnualReturnYear05	5.91%
10 YEARS	rr_AverageAnnualReturnYear10	5.10%

[1] Before Waiver

[2] Restated to reflect current fee waiver and/or expense reimbursement.

[3] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[4] After Fee Waiver and/or Expense Reimbursement

[5] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

[6] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[7] For Class C shares, the CDSC is 0% after the first year.

XML

Pennsylvania Portfolio

PENNSYLVANIA PORTFOLIO

INVESTMENT OBJECTIVE:

The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and Commonwealth of Pennsylvania personal income tax that is available without assuming what the Adviser considers to be undue risk.

FEES AND EXPENSES OF THE PORTFOLIO:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees Pennsylvania Portfolio (USD $)	CLASS A SHARES	CLASS B SHARES		CLASS C SHARES
Shareholder Fees Column [Text]		(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.00%	none		none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	3.00%	[1]	1.00%	[2]
Exchange Fee	none	none		none

ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Portfolio Operating Expenses Pennsylvania Portfolio		CLASS A	CLASS B	CLASS C
Management Fees		0.45%	0.45%	0.45%
Distribution and/or Service (12b-1) Fees		0.30%	1.00%	1.00%
Other Expenses: Transfer Agent		0.04%	0.06%	0.05%
Other Expenses		0.20%	0.20%	0.19%
Total Other Expenses		0.24%	0.26%	0.24%
Total Annual Portfolio Operating Expenses	[1]	0.99%	1.71%	1.69%
Fee Waiver and/or Expense Reimbursement	[2][3]	(0.09%)	(0.11%)	(0.09%)
Total Annual Portfolio Operating Expenses	[3][4]	0.90%	1.60%	1.60%

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Pennsylvania Portfolio (USD $)	CLASS A	CLASS B	CLASS C
After 1 Year	389	463	263
After 3 Years	597	628	523
After 5 Years	822	917	909
After 10 Years	1,468	1,642	1,989

For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:

Expense Example, No Redemption Pennsylvania Portfolio (USD $)	CLASS B	CLASS C
After 1 Year	163	163
After 3 Years	528	523
After 5 Years	917	909
After 10 Years	1,642	1,989

PORTFOLIO TURNOVER

The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 20% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Pennsylvania or municipal securities with interest that is otherwise exempt from Pennsylvania state income tax.

The Portfolio may also invest in:

• forward commitments;

• zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and

• derivatives, such as options, futures, forwards and swaps.

PRINCIPAL RISKS:

• MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market.

• CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations.

• MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Pennsylvania municipal securities may be vulnerable to events adversely affecting its economy. Pennsylvania's economy has become more diverse, shifting from the coal, steel, and railroad industries. While the services sector is growing, the state is still relatively more dependent upon manufacturing and is vulnerable to business downturns and decreased capital spending. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities.

• TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield.

• INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations.

• DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%.

• INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets.

• DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments.

• MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results.

As with all investments, you may lose money by investing in the Portfolio.

BAR CHART AND PERFORMANCE INFORMATION:

The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing:

• how the Portfolio's performance changed from year to year over ten years; and

• how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.

You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance").

The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.

BAR CHART

The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.

Calendar Year End (%)

During the period shown in the bar chart, the Portfolio's:

BEST QUARTER WAS UP 6.86%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -4.16%, 4TH QUARTER, 2008.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS

(For the periods ended December 31, 2012)

Average Annual Total Returns Pennsylvania Portfolio		1 YEAR	5 YEARS	10 YEARS
CLASS A	[1]	3.28%	4.44%	4.38%
CLASS A Return After Taxes on Distributions	[1]	3.12%	4.36%	4.33%
CLASS A Return After Taxes on Distributions and Sale of Portfolio Shares	[1]	3.45%	4.32%	4.30%
CLASS B		2.78%	4.35%	4.26%
CLASS C		4.77%	4.34%	3.96%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)		6.78%	5.91%	5.10%

[1] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[2] For Class C shares, the CDSC is 0% after the first year.

[1] Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] Restated to reflect current fee waiver and/or expense reimbursement.

[4] After Fee Waiver and/or Expense Reimbursement

[1] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

XML

Ohio Portfolio

OHIO PORTFOLIO

INVESTMENT OBJECTIVE:

The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and State of Ohio personal income tax that is available without assuming what the Adviser considers to be undue risk.

FEES AND EXPENSES OF THE PORTFOLIO:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees Ohio Portfolio (USD $)	CLASS A SHARES	CLASS B SHARES		CLASS C SHARES
Shareholder Fees Column [Text]		(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.00%	none		none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	3.00%	[1]	1.00%	[2]
Exchange Fee	none	none		none

ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Portfolio Operating Expenses Ohio Portfolio		CLASS A	CLASS B	CLASS C
Management Fees		0.45%	0.45%	0.45%
Distribution and/or Service (12b-1) Fees		0.30%	1.00%	1.00%
Other Expenses: Transfer Agent		0.04%	0.07%	0.04%
Other Expenses: Interest Expense		0.01%	none	0.01%
Other Expenses		0.17%	0.18%	0.17%
Total Other Expenses		0.22%	0.25%	0.22%
Total Annual Portfolio Operating Expenses	[1]	0.97%	1.70%	1.67%
Fee Waiver and/or Expense Reimbursement	[2]	(0.11%)	(0.15%)	(0.11%)
Total Annual Portfolio Operating Expenses	[3][4]	0.86%	1.55%	1.56%

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Ohio Portfolio (USD $)	CLASS A	CLASS B	CLASS C
After 1 Year	385	458	259
After 3 Years	589	620	515
After 5 Years	809	908	896
After 10 Years	1,443	1,622	1,965

For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:

Expense Example, No Redemption Ohio Portfolio (USD $)	CLASS B	CLASS C
After 1 Year	158	159
After 3 Years	520	515
After 5 Years	908	896
After 10 Years	1,622	1,965

PORTFOLIO TURNOVER

The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 27% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Ohio or municipal securities with interest that is otherwise exempt from Ohio state income tax.

The Portfolio may also invest in:

• forward commitments;

• zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and

• derivatives, such as options, futures, forwards and swaps.

PRINCIPAL RISKS:

• MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market.

• CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations.

• MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Ohio municipal securities may be vulnerable to events adversely affecting its economy. Ohio's economy is heavily reliant on manufacturing, particularly the automobile and related products industries. The automobile industry recently suffered severe reductions in purchases of automobiles, which led to bankruptcy filings for two of the largest automobile manufacturers and required U.S. Government support. The automobile industry has since recovered and these companies have successfully emerged from bankruptcy. However, other economic conditions continue to adversely affect the state's economy and employment rates. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities.

• TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield.

• INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations.

• DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%.

• INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets.

• DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments.

• MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results.

As with all investments, you may lose money by investing in the Portfolio.

BAR CHART AND PERFORMANCE INFORMATION:

The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing:

• how the Portfolio's performance changed from year to year over ten years; and

• how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.

You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance").

The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.

BAR CHART

The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.

Calendar Year End (%)

During the period shown in the bar chart, the Portfolio's:

BEST QUARTER WAS UP 5.82%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -3.28%, 3RD QUARTER, 2008.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS

(For the periods ended December 31, 2012)

Average Annual Total Returns Ohio Portfolio		1 YEAR	5 YEARS	10 YEARS
CLASS A	[1]	2.94%	4.32%	4.44%
CLASS A Return After Taxes on Distributions	[1]	2.85%	4.28%	4.41%
CLASS A Return After Taxes on Distributions and Sale of Portfolio Shares	[1]	3.21%	4.22%	4.36%
CLASS B		2.41%	4.23%	4.32%
CLASS C		4.40%	4.25%	4.04%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)		6.78%	5.91%	5.10%

[1] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[2] For Class C shares, the CDSC is 0% after the first year.

[1] Including Interest Expense Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] Including Interest Expense After Fee Waiver and/or expense reimbursement.

[4] If interest expense were excluded, net expenses would be as follows: CLASS A CLASS C ADVISOR CLASS 0.85% 1.55% 1.55%.

[1] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Arizona Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ARIZONA PORTFOLIO
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and State of Arizona personal income tax that is available without assuming what the Adviser considers to be undue risk.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE PORTFOLIO:
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 17% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	17.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year. For Class C shares, the CDSC is 0% after the first year.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLES
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Arizona or municipal securities with interest that is otherwise exempt from Arizona state income tax. The Portfolio may also invest in: forward commitments; zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and derivatives, such as options, futures, forwards and swaps.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations. MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Arizona municipal securities are vulnerable to events adversely affecting its economy. The leading sectors of Arizona's economy are the real estate and rental industries and tourism. Construction is also an important sector due to the rapid growth of Arizona's population in recent years. These sectors are particularly vulnerable to times of impaired consumer and business spending. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities. TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield. INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%. INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities. LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets. DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments. MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. As with all investments, you may lose money by investing in the Portfolio.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Portfolio.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	BAR CHART AND PERFORMANCE INFORMATION:
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing: how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index. You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance"). The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.AllianceBernstein.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	BAR CHART
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Portfolio's: BEST QUARTER WAS UP 5.95%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -3.70%, 4TH QUARTER, 2010.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2012)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios
Arizona Portfolio | CLASS A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.00%
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.03%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.16%
Other Expenses: Interest Expense	rr_Component3OtherExpensesOverAssets	0.01%
Total Other Expenses	rr_OtherExpensesOverAssets	0.20%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	0.95%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.16%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	0.79%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	378
After 3 Years	rr_ExpenseExampleYear03	578
After 5 Years	rr_ExpenseExampleYear05	794
After 10 Years	rr_ExpenseExampleYear10	1,416
2003	rr_AnnualReturn2003	5.28%
2004	rr_AnnualReturn2004	6.35%
2005	rr_AnnualReturn2005	4.25%
2006	rr_AnnualReturn2006	4.51%
2007	rr_AnnualReturn2007	2.51%
2008	rr_AnnualReturn2008	(5.20%)
2009	rr_AnnualReturn2009	14.12%
2010	rr_AnnualReturn2010	2.17%
2011	rr_AnnualReturn2011	9.21%
2012	rr_AnnualReturn2012	6.88%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	5.95%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(3.70%)
1 YEAR	rr_AverageAnnualReturnYear01	3.69%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.59%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.59%	[5]
Arizona Portfolio | CLASS B
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	3.00%	[6]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.05%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.16%
Other Expenses: Interest Expense	rr_Component3OtherExpensesOverAssets	0.01%
Total Other Expenses	rr_OtherExpensesOverAssets	0.22%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.67%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.18%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.49%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	451
After 3 Years	rr_ExpenseExampleYear03	608
After 5 Years	rr_ExpenseExampleYear05	889
After 10 Years	rr_ExpenseExampleYear10	1,590
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	151
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	508
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	889
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,590
1 YEAR	rr_AverageAnnualReturnYear01	3.15%
5 YEARS	rr_AverageAnnualReturnYear05	4.51%
10 YEARS	rr_AverageAnnualReturnYear10	4.47%
Arizona Portfolio | CLASS C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[7]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.03%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.16%
Other Expenses: Interest Expense	rr_Component3OtherExpensesOverAssets	0.01%
Total Other Expenses	rr_OtherExpensesOverAssets	0.20%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.65%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.16%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.49%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	251
After 3 Years	rr_ExpenseExampleYear03	504
After 5 Years	rr_ExpenseExampleYear05	881
After 10 Years	rr_ExpenseExampleYear10	1,938
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	151
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	504
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	881
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,938
1 YEAR	rr_AverageAnnualReturnYear01	5.15%
5 YEARS	rr_AverageAnnualReturnYear05	4.51%
10 YEARS	rr_AverageAnnualReturnYear10	4.18%
Arizona Portfolio | Return After Taxes on Distributions | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	3.68%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.55%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.57%	[5]
Arizona Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	3.71%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.49%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.52%	[5]
Arizona Portfolio | Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	6.78%
5 YEARS	rr_AverageAnnualReturnYear05	5.91%
10 YEARS	rr_AverageAnnualReturnYear10	5.10%

[1] Including Interest Expense Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] If interest expense were excluded, net expenses would be as follows: CLASS A CLASS C ADVISOR CLASS 0.78% 1.48% 1.48%.

[4] Including Interest Expense After Fee Waiver and/or Expense Reimbursement

[5] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

[6] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[7] For Class C shares, the CDSC is 0% after the first year.

XML

Arizona Portfolio

ARIZONA PORTFOLIO

INVESTMENT OBJECTIVE:

The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and State of Arizona personal income tax that is available without assuming what the Adviser considers to be undue risk.

FEES AND EXPENSES OF THE PORTFOLIO:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees Arizona Portfolio (USD $)	CLASS A SHARES	CLASS B SHARES		CLASS C SHARES
Shareholder Fees Column [Text]		(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.00%	none		none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	3.00%	[1]	1.00%	[2]
Exchange Fee	none	none		none

ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Portfolio Operating Expenses Arizona Portfolio		CLASS A	CLASS B	CLASS C
Management Fees		0.45%	0.45%	0.45%
Distribution and/or Service (12b-1) Fees		0.30%	1.00%	1.00%
Other Expenses: Transfer Agent		0.03%	0.05%	0.03%
Other Expenses: Interest Expense		0.01%	0.01%	0.01%
Other Expenses		0.16%	0.16%	0.16%
Total Other Expenses		0.20%	0.22%	0.20%
Total Annual Portfolio Operating Expenses	[1]	0.95%	1.67%	1.65%
Fee Waiver and/or Expense Reimbursement	[2]	(0.16%)	(0.18%)	(0.16%)
Total Annual Portfolio Operating Expenses	[3][4]	0.79%	1.49%	1.49%

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Arizona Portfolio (USD $)	CLASS A	CLASS B	CLASS C
After 1 Year	378	451	251
After 3 Years	578	608	504
After 5 Years	794	889	881
After 10 Years	1,416	1,590	1,938

For the share classes listed below, you would pay the following expenses if you
did not redeem your shares at the end of the period:

Expense Example, No Redemption Arizona Portfolio (USD $)	CLASS B	CLASS C
After 1 Year	151	151
After 3 Years	508	504
After 5 Years	889	881
After 10 Years	1,590	1,938

PORTFOLIO TURNOVER

The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 17% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Arizona or municipal securities with interest that is otherwise exempt from Arizona state income tax.

The Portfolio may also invest in:

• forward commitments;

• zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and

• derivatives, such as options, futures, forwards and swaps.

PRINCIPAL RISKS:

• MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market.

• CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations.

• MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Arizona municipal securities are vulnerable to events adversely affecting its economy. The leading sectors of Arizona's economy are the real estate and rental industries and tourism. Construction is also an important sector due to the rapid growth of Arizona's population in recent years. These sectors are particularly vulnerable to times of impaired consumer and business spending. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities.

• TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield.

• INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations.

• DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%.

• INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets.

• DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments.

• MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results.

As with all investments, you may lose money by investing in the Portfolio.

BAR CHART AND PERFORMANCE INFORMATION:

The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing:

• how the Portfolio's performance changed from year to year over ten years; and

• how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.

You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance").

The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.

BAR CHART

The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.

Calendar Year End (%)

During the period shown in the bar chart, the Portfolio's:

BEST QUARTER WAS UP 5.95%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -3.70%, 4TH QUARTER, 2010.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS

(For the periods ended December 31, 2012)

Average Annual Total Returns Arizona Portfolio		1 YEAR	5 YEARS	10 YEARS
CLASS A	[1]	3.69%	4.59%	4.59%
CLASS A Return After Taxes on Distributions	[1]	3.68%	4.55%	4.57%
CLASS A Return After Taxes on Distributions and Sale of Portfolio Shares	[1]	3.71%	4.49%	4.52%
CLASS B		3.15%	4.51%	4.47%
CLASS C		5.15%	4.51%	4.18%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)		6.78%	5.91%	5.10%

[1] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[2] For Class C shares, the CDSC is 0% after the first year.

[1] Including Interest Expense Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] If interest expense were excluded, net expenses would be as follows: CLASS A CLASS C ADVISOR CLASS 0.78% 1.48% 1.48%.

[4] Including Interest Expense After Fee Waiver and/or Expense Reimbursement

[1] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Virginia Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	VIRGINIA PORTFOLIO
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and Commonwealth of Virginia personal income tax that is available without assuming what the Adviser considers to be undue risk.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE PORTFOLIO:
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 23% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	23.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year. For Class C shares, the CDSC is 0% after the first year.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Restated to reflect current fee waiver and/or expense reimbursement.
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLES
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	For the shares classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Virginia or municipal securities with interest that is otherwise exempt from Virginia state income tax. The Portfolio may also invest in: forward commitments; zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and derivatives, such as options, futures, forwards and swaps.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations. MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Virginia municipal securities may be vulnerable to events adversely affecting its economy. Virginia has a highly diversified economy, with services as a major component. The U.S. Government, both military and civilian, plays a large role in its economy. The state benefits from increases in U.S. Government spending but is vulnerable to spending decreases. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities. TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield. INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%. INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities. LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets. DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments. MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. As with all investments, you may lose money by investing in the Portfolio.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Portfolio.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	BAR CHART AND PERFORMANCE INFORMATION:
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing: how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index. You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance"). The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.AllianceBernstein.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	BAR CHART
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Portfolio's: BEST QUARTER WAS UP 5.98%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -3.57%, 3RD QUARTER, 2008.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2012)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios
Virginia Portfolio | CLASS A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.00%
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.03%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.11%
Total Other Expenses	rr_OtherExpensesOverAssets	0.14%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	0.89%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.09%)	[2],[3]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	0.80%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	379
After 3 Years	rr_ExpenseExampleYear03	566
After 5 Years	rr_ExpenseExampleYear05	769
After 10 Years	rr_ExpenseExampleYear10	1,354
2003	rr_AnnualReturn2003	6.31%
2004	rr_AnnualReturn2004	4.82%
2005	rr_AnnualReturn2005	4.85%
2006	rr_AnnualReturn2006	4.26%
2007	rr_AnnualReturn2007	2.71%
2008	rr_AnnualReturn2008	(4.83%)
2009	rr_AnnualReturn2009	14.54%
2010	rr_AnnualReturn2010	2.70%
2011	rr_AnnualReturn2011	10.72%
2012	rr_AnnualReturn2012	7.15%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	5.98%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(3.57%)
1 YEAR	rr_AverageAnnualReturnYear01	3.90%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	5.19%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.89%	[5]
Virginia Portfolio | CLASS B
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	3.00%	[6]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.05%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.11%
Total Other Expenses	rr_OtherExpensesOverAssets	0.16%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.61%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.11%)	[2],[3]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.50%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	453
After 3 Years	rr_ExpenseExampleYear03	597
After 5 Years	rr_ExpenseExampleYear05	865
After 10 Years	rr_ExpenseExampleYear10	1,530
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	153
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	497
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	865
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,530
1 YEAR	rr_AverageAnnualReturnYear01	3.44%
5 YEARS	rr_AverageAnnualReturnYear05	5.12%
10 YEARS	rr_AverageAnnualReturnYear10	4.77%
Virginia Portfolio | CLASS C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[7]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.03%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.11%
Total Other Expenses	rr_OtherExpensesOverAssets	0.14%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.59%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.09%)	[2],[3]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.50%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	253
After 3 Years	rr_ExpenseExampleYear03	493
After 5 Years	rr_ExpenseExampleYear05	856
After 10 Years	rr_ExpenseExampleYear10	1,880
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	153
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	493
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	856
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,880
1 YEAR	rr_AverageAnnualReturnYear01	5.42%
5 YEARS	rr_AverageAnnualReturnYear05	5.12%
10 YEARS	rr_AverageAnnualReturnYear10	4.49%
Virginia Portfolio | Return After Taxes on Distributions | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	3.73%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	5.11%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.84%	[5]
Virginia Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	3.79%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.95%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.76%	[5]
Virginia Portfolio | Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	6.78%
5 YEARS	rr_AverageAnnualReturnYear05	5.91%
10 YEARS	rr_AverageAnnualReturnYear10	5.10%

[1] Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] Restated to reflect current fee waiver and/or expense reimbursement.

[4] After Fee Waiver and/or Expense Reimbursement

[5] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

[6] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[7] For Class C shares, the CDSC is 0% after the first year.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Massachusetts Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	MASSACHUSETTS PORTFOLIO
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and Commonwealth of Massachusetts personal income tax that is available without assuming what the Adviser considers to be undue risk.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE PORTFOLIO:
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 6% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	6.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year. For Class C shares, the CDSC is 0% after the first year.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLES
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Massachusetts or municipal securities with interest that is otherwise exempt from Massachusetts state income tax. The Portfolio may also invest in: forward commitments; zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and derivatives, such as options, futures, forwards and swaps.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations. MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Massachusetts municipal securities are vulnerable to events adversely affecting its economy, which is relatively diverse based on education, healthcare, financial services, and high technology. Massachusetts has a high degree of job stability and an educated work force due to its large concentration of colleges and universities but the high cost of doing business in Massachusetts may serve as an impediment to job creation. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities. TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield. INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%. INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities. LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets. DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments. MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. As with all investments, you may lose money by investing in the Portfolio.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Portfolio.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	BAR CHART AND PERFORMANCE INFORMATION:
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing: how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index. You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance"). The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing: how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.AllianceBernstein.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	BAR CHART
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Portfolio's: BEST QUARTER WAS UP 5.76%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -4.70%, 4TH QUARTER, 2010.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2012)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios
Massachusetts Portfolio | CLASS A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.00%
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.03%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.10%
Total Other Expenses	rr_OtherExpensesOverAssets	0.13%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	0.88%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	0.82%	[3]
After 1 Year	rr_ExpenseExampleYear01	381
After 3 Years	rr_ExpenseExampleYear03	566
After 5 Years	rr_ExpenseExampleYear05	767
After 10 Years	rr_ExpenseExampleYear10	1,346
2003	rr_AnnualReturn2003	4.74%
2004	rr_AnnualReturn2004	5.53%
2005	rr_AnnualReturn2005	4.18%
2006	rr_AnnualReturn2006	4.28%
2007	rr_AnnualReturn2007	3.15%
2008	rr_AnnualReturn2008	(1.64%)
2009	rr_AnnualReturn2009	10.96%
2010	rr_AnnualReturn2010	1.84%
2011	rr_AnnualReturn2011	10.94%
2012	rr_AnnualReturn2012	7.65%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	5.76%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(4.70%)
1 YEAR	rr_AverageAnnualReturnYear01	4.45%	[4]
5 YEARS	rr_AverageAnnualReturnYear05	5.19%	[4]
10 YEARS	rr_AverageAnnualReturnYear10	4.77%	[4]
Massachusetts Portfolio | CLASS B
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	3.00%	[5]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.04%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.11%
Total Other Expenses	rr_OtherExpensesOverAssets	0.15%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.60%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.08%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.52%	[3]
After 1 Year	rr_ExpenseExampleYear01	455
After 3 Years	rr_ExpenseExampleYear03	597
After 5 Years	rr_ExpenseExampleYear05	863
After 10 Years	rr_ExpenseExampleYear10	1,522
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	155
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	497
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	863
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,522
1 YEAR	rr_AverageAnnualReturnYear01	4.01%
5 YEARS	rr_AverageAnnualReturnYear05	5.11%
10 YEARS	rr_AverageAnnualReturnYear10	4.66%
Massachusetts Portfolio | CLASS C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[6]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.03%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.11%
Total Other Expenses	rr_OtherExpensesOverAssets	0.14%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.59%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.07%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.52%	[3]
After 1 Year	rr_ExpenseExampleYear01	255
After 3 Years	rr_ExpenseExampleYear03	495
After 5 Years	rr_ExpenseExampleYear05	858
After 10 Years	rr_ExpenseExampleYear10	1,882
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	155
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	495
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	858
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,882
1 YEAR	rr_AverageAnnualReturnYear01	5.91%
5 YEARS	rr_AverageAnnualReturnYear05	5.10%
10 YEARS	rr_AverageAnnualReturnYear10	4.38%
Massachusetts Portfolio | Return After Taxes on Distributions | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	4.34%	[4]
5 YEARS	rr_AverageAnnualReturnYear05	5.13%	[4]
10 YEARS	rr_AverageAnnualReturnYear10	4.73%	[4]
Massachusetts Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	4.12%	[4]
5 YEARS	rr_AverageAnnualReturnYear05	4.93%	[4]
10 YEARS	rr_AverageAnnualReturnYear10	4.63%	[4]
Massachusetts Portfolio | Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	6.78%
5 YEARS	rr_AverageAnnualReturnYear05	5.91%
10 YEARS	rr_AverageAnnualReturnYear10	5.10%

[1] Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] After Fee Waiver and/or Expense Reimbursement

[4] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

[5] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[6] For Class C shares, the CDSC is 0% after the first year.

XML

Document and Entity Information	12 Months Ended
	Jan. 31, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Sep. 30, 2012
Registrant Name	ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II
Central Index Key	0000899774
Amendment Flag	false
Document Creation Date	Jan. 31, 2013
Document Effective Date	Jan. 31, 2013
Prospectus Date	Jan. 31, 2013

XML

Michigan Portfolio

MICHIGAN PORTFOLIO

INVESTMENT OBJECTIVE:

The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and State of Michigan personal income tax that is available without assuming what the Adviser considers to be undue risk.

FEES AND EXPENSES OF THE PORTFOLIO:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees Michigan Portfolio (USD $)	CLASS A SHARES	CLASS B SHARES		CLASS C SHARES
Shareholder Fees Column [Text]		(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.00%	none		none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	3.00%	[1]	1.00%	[2]
Exchange Fee	none	none		none

ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Portfolio Operating Expenses Michigan Portfolio		CLASS A SHARES	CLASS B	CLASS C
Management Fees		0.45%	0.45%	0.45%
Distribution and/or Service (12b-1) Fees		0.30%	1.00%	1.00%
Other Expenses: Transfer Agent		0.06%	0.08%	0.06%
Other Expenses		0.24%	0.25%	0.25%
Total Other Expenses		0.30%	0.33%	0.31%
Total Annual Portfolio Operating Expenses	[1]	1.05%	1.78%	1.76%
Fee Waiver and/or Expense Reimbursement	[2][3]	(0.15%)	(0.18%)	(0.16%)
Total Annual Portfolio Operating Expenses	[2][4]	0.90%	1.60%	1.60%

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Michigan Portfolio (USD $)	CLASS A	CLASS B	CLASS C
After 1 Year	389	463	263
After 3 Years	609	642	538
After 5 Years	847	946	938
After 10 Years	1,529	1,708	2,057

For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:

Expense Example, No Redemption Michigan Portfolio (USD $)	CLASS B	CLASS C
After 1 Year	163	163
After 3 Years	542	538
After 5 Years	946	938
After 10 Years	1,708	2,057

PORTFOLIO TURNOVER

The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 28% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Michigan or municipal securities with interest that is otherwise exempt from Michigan state income tax.

The Portfolio may also invest in:

• forward commitments;

• zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and

• derivatives, such as options, futures, forwards and swaps.

PRINCIPAL RISKS:

• MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market.

• CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations.

• MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Michigan municipal securities may be vulnerable to events adversely affecting its economy. Michigan's economy has recently become more diverse but is still heavily dependent on manufacturing, particularly the automobile and automobile parts industry. The automobile industry recently suffered severe reductions in purchases of automobiles, which led to bankruptcy filings for two of the largest automobile manufacturers and required U.S. Government support. The automobile industry has since recovered and these companies have successfully emerged from bankruptcy. However, other economic conditions continue to adversely affect the state's economy and employment rates. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities.

• TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield.

• INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations.

• INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%.

• LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets.

• DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments.

• MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results.

As with all investments, you may lose money by investing in the Portfolio.

BAR CHART AND PERFORMANCE INFORMATION:

The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing:

• how the Portfolio's performance changed from year to year over ten years; and

• how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.

You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance").

The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.

BAR CHART

The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.

Calendar Year End (%)

During the period shown in the bar chart, the Portfolio's:

BEST QUARTER WAS UP 4.90%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -2.88%, 3RD QUARTER, 2008.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS

(For the periods ended December 31, 2012)

Average Annual Total Returns Michigan Portfolio		1 Year	5 Years	10 Years
CLASS A	[1]	2.06%	3.82%	4.07%
CLASS A Return After Taxes on Distributions	[1]	1.86%	3.73%	4.00%
CLASS A Return After Taxes on Distributions and Sale of Portfolio Shares	[1]	2.72%	3.76%	4.02%
CLASS B		1.47%	3.74%	3.95%
CLASS C		3.46%	3.73%	3.68%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)		6.78%	5.91%	5.10%

[1] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[2] For Class C shares, the CDSC is 0% after the first year.

[1] Before Waiver

[2] Restated to reflect current fee waiver and/or expense reimbursement.

[3] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[4] After Fee Waiver and/or Expense Reimbursement

[1] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Document Creation Date	dei_DocumentCreationDate	Jan. 31, 2013

XML

New Jersey Portfolio

NEW JERSEY PORTFOLIO

INVESTMENT OBJECTIVE:

The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and State of New Jersey personal income tax that is available without assuming what the Adviser considers to be undue risk.

FEES AND EXPENSES OF THE PORTFOLIO:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees New Jersey Portfolio (USD $)	CLASS A SHARES	CLASS B SHARES		CLASS C SHARES
Shareholder Fees Column [Text]		(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.00%	none		none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	3.00%	[1]	1.00%	[2]
Exchange Fee	none	none		none

ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Portfolio Operating Expenses New Jersey Portfolio		CLASS A	CLASS B	CLASS C
Management Fees		0.45%	0.45%	0.45%
Distribution and/or Service (12b-1) Fees		0.30%	1.00%	1.00%
Other Expenses: Transfer Agent		0.04%	0.06%	0.04%
Other Expenses		0.17%	0.17%	0.17%
Total Other Expenses		0.21%	0.23%	0.21%
Total Annual Portfolio Operating Expenses	[1]	0.96%	1.68%	1.66%
Fee Waiver and/or Expense Reimbursement	[2]	(0.09%)	(0.11%)	(0.09%)
Total Annual Portfolio Operating Expenses	[3]	0.87%	1.57%	1.57%

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example New Jersey Portfolio (USD $)	CLASS A	CLASS B	CLASS C
After 1 Year	386	460	260
After 3 Years	588	618	514
After 5 Years	806	901	893
After 10 Years	1,434	1,609	1,956

For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:

Expense Example, No Redemption New Jersey Portfolio (USD $)	CLASS B	CLASS C
After 1 Year	160	160
After 3 Years	518	514
After 5 Years	901	893
After 10 Years	1,609	1,956

PORTFOLIO TURNOVER

The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 14% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of New Jersey or municipal securities with interest that is otherwise exempt from New Jersey state income tax.

The Portfolio may also invest in:

• forward commitments;

• zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and

• derivatives, such as options, futures, forwards and swaps.

PRINCIPAL RISKS:

• MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market.

• CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations.

• MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in New Jersey municipal securities may be vulnerable to events adversely affecting its economy. New Jersey's economy is a diverse mix of manufacturing, construction, and service industries. Major components of its economy are financial services and pharmaceuticals and adverse events affecting these industries will have a negative effect on New Jersey's economy. New Jersey is also susceptible to persistent budget problems and overdependence on taxes. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities.

• TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield.

• INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations.

• DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%.

• INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets.

• DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments.

• MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results.

As with all investments, you may lose money by investing in the Portfolio.

BAR CHART AND PERFORMANCE INFORMATION:

The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing:

• how the Portfolio's performance changed from year to year over ten years; and

• how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.

You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance").

The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.

BAR CHART

The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.

Calendar Year End (%)

During the period shown in the bar chart, the Portfolio's:

BEST QUARTER WAS UP 6.76%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -3.99%, 4TH QUARTER, 2008.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS

(For the periods ended December 31, 2012)

Average Annual Total Returns New Jersey Portfolio		1 YEAR	5 YEARS	10 YEARS
CLASS A	[1]	4.19%	4.55%	4.38%
CLASS A Return After Taxes on Distributions	[1]	4.16%	4.53%	4.36%
CLASS A Return After Taxes on Distributions and Sale of Portfolio Shares	[1]	3.98%	4.45%	4.33%
CLASS B		3.62%	4.47%	4.25%
CLASS C		5.51%	4.46%	3.95%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)		6.78%	5.91%	5.10%

[1] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[2] For Class C shares, the CDSC is 0% after the first year.

[1] Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] After Fee Waiver and/or Expense Reimbursement

[1] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

XML

Minnesota Portfolio

MINNESOTA PORTFOLIO

INVESTMENT OBJECTIVE:

The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and State of Minnesota personal income tax that is available without assuming what the Adviser considers to be undue risk.

FEES AND EXPENSES OF THE PORTFOLIO:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees Minnesota Portfolio (USD $)	CLASS A SHARES	CLASS B SHARES		CLASS C SHRAES
Shareholder Fees Column [Text]		(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.00%	none		none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	3.00%	[1]	1.00%	[2]
Exchange Fee	none	none		none

ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Portfolio Operating Expenses Minnesota Portfolio		CLASS A	CLASS B	CLASS C
Management Fees		0.45%	0.45%	0.45%
Distribution and/or Service (12b-1) Fees		0.30%	1.00%	1.00%
Other Expenses: Transfer Agent		0.04%	0.26%	0.04%
Other Expenses: Interest Expense		0.01%	none	0.01%
Other Expenses		0.22%	0.23%	0.22%
Total Other Expenses		0.27%	0.49%	0.27%
Total Annual Portfolio Operating Expenses	[1]	1.02%	1.94%	1.72%
Fee Waiver and/or Expense Reimbursement	[2]	(0.11%)	(0.33%)	(0.11%)
Total Annual Portfolio Operating Expenses	[3][4]	0.91%	1.61%	1.61%

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Minnesota Portfolio (USD $)	CLASS A	CLASS B	CLASS C
After 1 Year	390	463	264
After 3 Years	604	676	531
After 5 Years	835	1,013	922
After 10 Years	1,500	1,772	2,019

For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:

Expense Example, No Redemption Minnesota Portfolio (USD $)	CLASS B	CLASS C
After 1 Year	163	164
After 3 Years	576	531
After 5 Years	1,013	922
After 10 Years	1,772	2,019

PORTFOLIO TURNOVER

The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 14% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Minnesota or municipal securities with interest that is otherwise exempt from Minnesota state income tax.

The Portfolio may also invest in:

• forward commitments;

• zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and

• derivatives, such as options, futures, forwards and swaps.

PRINCIPAL RISKS:

• MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market.

• CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations.

• MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Minnesota municipal securities may be vulnerable to events adversely affecting its economy. Minnesota's economy is diverse, but there are employment concentrations in the fabricated metals, machinery, computers and electronics categories of the durable goods manufacturing sector, which are vulnerable during general economic downturns. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities.

• TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield.

• INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations.

• DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%.

• INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets.

• DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments.

• MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results.

As with all investments, you may lose money by investing in the Portfolio.

BAR CHART AND PERFORMANCE INFORMATION:

The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing:

• how the Portfolio's performance changed from year to year over ten years; and

• how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.

You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance").

The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.

BAR CHART

The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.

Calendar Year End (%)

During the period shown in the bar chart, the Portfolio's:

BEST QUARTER WAS UP 6.19%, 1ST QUARTER, 2009; AND WORST QUARTER WAS DOWN -4.03%, 4TH QUARTER, 2010.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS

(For the periods ended December 31, 2012)

Average Annual Total Returns Minnesota Portfolio		1 YEAR	5 YEARS	10 YEARS
CLASS A	[1]	2.52%	4.29%	4.26%
CLASS A Return After Taxes on Distributions	[1]	2.43%	4.25%	4.23%
CLASS A Return After Taxes on Distributions and Sale of Portfolio Shares	[1]	2.81%	4.15%	4.17%
CLASS B		1.92%	4.22%	4.14%
CLASS C		3.91%	4.21%	3.85%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)		6.78%	5.91%	5.10%

[1] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[2] For Class C shares, the CDSC is 0% after the first year.

[1] Including Interest Expense Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] If interest expense were excluded, net expenses would be as follows: CLASS A CLASS C ADVISOR CLASS 0.90% 1.60% 1.60%.

[4] Including Interest Expense After Fee Waiver and/or Expense Reimbursement

[1] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
Ohio Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	OHIO PORTFOLIO
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and State of Ohio personal income tax that is available without assuming what the Adviser considers to be undue risk.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE PORTFOLIO:
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 27% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	27.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.For Class C shares, the CDSC is 0% after the first year.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLES
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Ohio or municipal securities with interest that is otherwise exempt from Ohio state income tax. The Portfolio may also invest in: forward commitments; zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and derivatives, such as options, futures, forwards and swaps.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations. MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Ohio municipal securities may be vulnerable to events adversely affecting its economy. Ohio's economy is heavily reliant on manufacturing, particularly the automobile and related products industries. The automobile industry recently suffered severe reductions in purchases of automobiles, which led to bankruptcy filings for two of the largest automobile manufacturers and required U.S. Government support. The automobile industry has since recovered and these companies have successfully emerged from bankruptcy. However, other economic conditions continue to adversely affect the state's economy and employment rates. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities. TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield. INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%. INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities. LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets. DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments. MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. As with all investments, you may lose money by investing in the Portfolio.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Portfolio.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	BAR CHART AND PERFORMANCE INFORMATION:
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing: how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index. You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance"). The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Portfolio's performance changed from year to year over ten years; and . how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.AllianceBernstein.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	BAR CHART
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Portfolio's: BEST QUARTER WAS UP 5.82%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -3.28%, 3RD QUARTER, 2008.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2012)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios
Ohio Portfolio | CLASS A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.00%
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.04%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.17%
Other Expenses: Interest Expense	rr_Component3OtherExpensesOverAssets	0.01%
Total Other Expenses	rr_OtherExpensesOverAssets	0.22%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	0.97%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.11%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	0.86%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	385
After 3 Years	rr_ExpenseExampleYear03	589
After 5 Years	rr_ExpenseExampleYear05	809
After 10 Years	rr_ExpenseExampleYear10	1,443
2003	rr_AnnualReturn2003	6.67%
2004	rr_AnnualReturn2004	4.90%
2005	rr_AnnualReturn2005	3.84%
2006	rr_AnnualReturn2006	4.88%
2007	rr_AnnualReturn2007	2.64%
2008	rr_AnnualReturn2008	(3.99%)
2009	rr_AnnualReturn2009	11.94%
2010	rr_AnnualReturn2010	3.37%
2011	rr_AnnualReturn2011	7.99%
2012	rr_AnnualReturn2012	6.14%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	5.82%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(3.28%)
1 YEAR	rr_AverageAnnualReturnYear01	2.94%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.32%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.44%	[5]
Ohio Portfolio | CLASS B
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	3.00%	[6]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.07%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.18%
Other Expenses: Interest Expense	rr_Component3OtherExpensesOverAssets	none
Total Other Expenses	rr_OtherExpensesOverAssets	0.25%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.70%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.15%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.55%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	458
After 3 Years	rr_ExpenseExampleYear03	620
After 5 Years	rr_ExpenseExampleYear05	908
After 10 Years	rr_ExpenseExampleYear10	1,622
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	158
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	520
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	908
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,622
1 YEAR	rr_AverageAnnualReturnYear01	2.41%
5 YEARS	rr_AverageAnnualReturnYear05	4.23%
10 YEARS	rr_AverageAnnualReturnYear10	4.32%
Ohio Portfolio | CLASS C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[7]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.04%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.17%
Other Expenses: Interest Expense	rr_Component3OtherExpensesOverAssets	0.01%
Total Other Expenses	rr_OtherExpensesOverAssets	0.22%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.67%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.11%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.56%	[3],[4]
After 1 Year	rr_ExpenseExampleYear01	259
After 3 Years	rr_ExpenseExampleYear03	515
After 5 Years	rr_ExpenseExampleYear05	896
After 10 Years	rr_ExpenseExampleYear10	1,965
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	159
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	515
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	896
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,965
1 YEAR	rr_AverageAnnualReturnYear01	4.40%
5 YEARS	rr_AverageAnnualReturnYear05	4.25%
10 YEARS	rr_AverageAnnualReturnYear10	4.04%
Ohio Portfolio | Return After Taxes on Distributions | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	2.85%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.28%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.41%	[5]
Ohio Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	3.21%	[5]
5 YEARS	rr_AverageAnnualReturnYear05	4.22%	[5]
10 YEARS	rr_AverageAnnualReturnYear10	4.36%	[5]
Ohio Portfolio | Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	6.78%
5 YEARS	rr_AverageAnnualReturnYear05	5.91%
10 YEARS	rr_AverageAnnualReturnYear10	5.10%

[1] Including Interest Expense Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] Including Interest Expense After Fee Waiver and/or expense reimbursement.

[4] If interest expense were excluded, net expenses would be as follows: CLASS A CLASS C ADVISOR CLASS 0.85% 1.55% 1.55%.

[5] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

[6] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[7] For Class C shares, the CDSC is 0% after the first year.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN MUNICIPAL INCOME FUND II
Prospectus Date	rr_ProspectusDate	Jan. 31, 2013
New Jersey Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	NEW JERSEY PORTFOLIO
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and State of New Jersey personal income tax that is available without assuming what the Adviser considers to be undue risk.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE PORTFOLIO:
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	January 31, 2014
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 14% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	14.00%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year. For Class C shares, the CDSC is 0% after the first year.
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Expense Example [Heading]	rr_ExpenseExampleHeading	EXAMPLES
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption [Text]	rr_ExpenseExampleNoRedemptionByYearCaption	For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of New Jersey or municipal securities with interest that is otherwise exempt from New Jersey state income tax. The Portfolio may also invest in: forward commitments; zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and derivatives, such as options, futures, forwards and swaps.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations. MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in New Jersey municipal securities may be vulnerable to events adversely affecting its economy. New Jersey's economy is a diverse mix of manufacturing, construction, and service industries. Major components of its economy are financial services and pharmaceuticals and adverse events affecting these industries will have a negative effect on New Jersey's economy. New Jersey is also susceptible to persistent budget problems and overdependence on taxes. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities. TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield. INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%. INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities. LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets. DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments. MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. As with all investments, you may lose money by investing in the Portfolio.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Portfolio.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	BAR CHART AND PERFORMANCE INFORMATION:
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing: how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index. You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance"). The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.AllianceBernstein.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	BAR CHART
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Portfolio's: BEST QUARTER WAS UP 6.76%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -3.99%, 4TH QUARTER, 2008.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2012)
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios
New Jersey Portfolio | CLASS A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.00%
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.30%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.04%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.17%
Total Other Expenses	rr_OtherExpensesOverAssets	0.21%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	0.96%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.09%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	0.87%	[3]
After 1 Year	rr_ExpenseExampleYear01	386
After 3 Years	rr_ExpenseExampleYear03	588
After 5 Years	rr_ExpenseExampleYear05	806
After 10 Years	rr_ExpenseExampleYear10	1,434
2003	rr_AnnualReturn2003	5.30%
2004	rr_AnnualReturn2004	4.64%
2005	rr_AnnualReturn2005	4.18%
2006	rr_AnnualReturn2006	5.03%
2007	rr_AnnualReturn2007	1.88%
2008	rr_AnnualReturn2008	(6.84%)
2009	rr_AnnualReturn2009	13.97%
2010	rr_AnnualReturn2010	3.34%
2011	rr_AnnualReturn2011	9.34%
2012	rr_AnnualReturn2012	7.37%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	6.76%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(3.99%)
1 YEAR	rr_AverageAnnualReturnYear01	4.19%	[4]
5 YEARS	rr_AverageAnnualReturnYear05	4.55%	[4]
10 YEARS	rr_AverageAnnualReturnYear10	4.38%	[4]
New Jersey Portfolio | CLASS B
Risk/Return:	rr_RiskReturnAbstract
Shareholder Fees Column [Text]	rr_ShareholderFeesColumnName	(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	3.00%	[5]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.06%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.17%
Total Other Expenses	rr_OtherExpensesOverAssets	0.23%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.68%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.11%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.57%	[3]
After 1 Year	rr_ExpenseExampleYear01	460
After 3 Years	rr_ExpenseExampleYear03	618
After 5 Years	rr_ExpenseExampleYear05	901
After 10 Years	rr_ExpenseExampleYear10	1,609
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	160
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	518
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	901
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,609
1 YEAR	rr_AverageAnnualReturnYear01	3.62%
5 YEARS	rr_AverageAnnualReturnYear05	4.47%
10 YEARS	rr_AverageAnnualReturnYear10	4.25%
New Jersey Portfolio | CLASS C
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	1.00%	[6]
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	0.04%
Other Expenses	rr_Component2OtherExpensesOverAssets	0.17%
Total Other Expenses	rr_OtherExpensesOverAssets	0.21%
Total Annual Portfolio Operating Expenses	rr_ExpensesOverAssets	1.66%	[1]
Fee Waiver and/or Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.09%)	[2]
Total Annual Portfolio Operating Expenses	rr_NetExpensesOverAssets	1.57%	[3]
After 1 Year	rr_ExpenseExampleYear01	260
After 3 Years	rr_ExpenseExampleYear03	514
After 5 Years	rr_ExpenseExampleYear05	893
After 10 Years	rr_ExpenseExampleYear10	1,956
After 1 Year	rr_ExpenseExampleNoRedemptionYear01	160
After 3 Years	rr_ExpenseExampleNoRedemptionYear03	514
After 5 Years	rr_ExpenseExampleNoRedemptionYear05	893
After 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,956
1 YEAR	rr_AverageAnnualReturnYear01	5.51%
5 YEARS	rr_AverageAnnualReturnYear05	4.46%
10 YEARS	rr_AverageAnnualReturnYear10	3.95%
New Jersey Portfolio | Return After Taxes on Distributions | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	4.16%	[4]
5 YEARS	rr_AverageAnnualReturnYear05	4.53%	[4]
10 YEARS	rr_AverageAnnualReturnYear10	4.36%	[4]
New Jersey Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | CLASS A
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	3.98%	[4]
5 YEARS	rr_AverageAnnualReturnYear05	4.45%	[4]
10 YEARS	rr_AverageAnnualReturnYear10	4.33%	[4]
New Jersey Portfolio | Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	6.78%
5 YEARS	rr_AverageAnnualReturnYear05	5.91%
10 YEARS	rr_AverageAnnualReturnYear10	5.10%

[1] Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] After Fee Waiver and/or Expense Reimbursement

[4] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

[5] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[6] For Class C shares, the CDSC is 0% after the first year.

XML

Massachusetts Portfolio

MASSACHUSETTS PORTFOLIO

INVESTMENT OBJECTIVE:

The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and Commonwealth of Massachusetts personal income tax that is available without assuming what the Adviser considers to be undue risk.

FEES AND EXPENSES OF THE PORTFOLIO:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees Massachusetts Portfolio (USD $)	CLASS A SHARES	CLASS B SHARES		CLASS C SHARES
Shareholder Fees Column [Text]		(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.00%	none		none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	3.00%	[1]	1.00%	[2]
Exchange Fee	none	none		none

ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)

Annual Portfolio Operating Expenses Massachusetts Portfolio		CLASS A	CLASS B	CLASS C
Management Fees		0.45%	0.45%	0.45%
Distribution and/or Service (12b-1) Fees		0.30%	1.00%	1.00%
Other Expenses: Transfer Agent		0.03%	0.04%	0.03%
Other Expenses		0.10%	0.11%	0.11%
Total Other Expenses		0.13%	0.15%	0.14%
Total Annual Portfolio Operating Expenses	[1]	0.88%	1.60%	1.59%
Fee Waiver and/or Expense Reimbursement	[2]	(0.06%)	(0.08%)	(0.07%)
Total Annual Portfolio Operating Expenses	[3]	0.82%	1.52%	1.52%

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Massachusetts Portfolio (USD $)	CLASS A	CLASS B	CLASS C
After 1 Year	381	455	255
After 3 Years	566	597	495
After 5 Years	767	863	858
After 10 Years	1,346	1,522	1,882

For the share classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:

Expense Example, No Redemption Massachusetts Portfolio (USD $)	CLASS B	CLASS C
After 1 Year	155	155
After 3 Years	497	495
After 5 Years	863	858
After 10 Years	1,522	1,882

PORTFOLIO TURNOVER

The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 6% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Massachusetts or municipal securities with interest that is otherwise exempt from Massachusetts state income tax.

The Portfolio may also invest in:

• forward commitments;

• zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and

• derivatives, such as options, futures, forwards and swaps.

PRINCIPAL RISKS:

• MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market.

• CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations.

• MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Massachusetts municipal securities are vulnerable to events adversely affecting its economy, which is relatively diverse based on education, healthcare, financial services, and high technology. Massachusetts has a high degree of job stability and an educated work force due to its large concentration of colleges and universities but the high cost of doing business in Massachusetts may serve as an impediment to job creation. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities.

• TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield.

• INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations.

• DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%.

• INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets.

• DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments.

• MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results.

As with all investments, you may lose money by investing in the Portfolio.

BAR CHART AND PERFORMANCE INFORMATION:

The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing:

• how the Portfolio's performance changed from year to year over ten years; and

• how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.

You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance").

The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.

BAR CHART

The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.

Calendar Year End (%)

During the period shown in the bar chart, the Portfolio's:

BEST QUARTER WAS UP 5.76%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -4.70%, 4TH QUARTER, 2010.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS

(For the periods ended December 31, 2012)

Average Annual Total Returns Massachusetts Portfolio		1 YEAR	5 YEARS	10 YEARS
CLASS A	[1]	4.45%	5.19%	4.77%
CLASS A Return After Taxes on Distributions	[1]	4.34%	5.13%	4.73%
CLASS A Return After Taxes on Distributions and Sale of Portfolio Shares	[1]	4.12%	4.93%	4.63%
CLASS B		4.01%	5.11%	4.66%
CLASS C		5.91%	5.10%	4.38%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)		6.78%	5.91%	5.10%

[1] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[2] For Class C shares, the CDSC is 0% after the first year.

[1] Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] After Fee Waiver and/or Expense Reimbursement

[1] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

XML

Virginia Portfolio

VIRGINIA PORTFOLIO

INVESTMENT OBJECTIVE:

The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and Commonwealth of Virginia personal income tax that is available without assuming what the Adviser considers to be undue risk.

FEES AND EXPENSES OF THE PORTFOLIO:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AllianceBernstein Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios--Sales Charge Reduction Programs for Class A Shares on page 75 of this Prospectus, and in Purchase of Shares--Sales Charge Reduction Programs for Class A Shares on page 149 of the Portfolio's SAI.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees Virginia Portfolio (USD $)	CLASS A SHARES	CLASS B SHARES		CLASS C SHARES
Shareholder Fees Column [Text]		(NOT CURRENTLY OFFERED TO NEW INVESTORS)
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.00%	none		none
Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	none	3.00%	[1]	1.00%	[2]
Exchange Fee	none	none		none

ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a
percentage of the value of your investment)

Annual Portfolio Operating Expenses Virginia Portfolio		CLASS A	CLASS B	CLASS C
Management Fees		0.45%	0.45%	0.45%
Distribution and/or Service (12b-1) Fees		0.30%	1.00%	1.00%
Other Expenses: Transfer Agent		0.03%	0.05%	0.03%
Other Expenses		0.11%	0.11%	0.11%
Total Other Expenses		0.14%	0.16%	0.14%
Total Annual Portfolio Operating Expenses	[1]	0.89%	1.61%	1.59%
Fee Waiver and/or Expense Reimbursement	[2][3]	(0.09%)	(0.11%)	(0.09%)
Total Annual Portfolio Operating Expenses	[3][4]	0.80%	1.50%	1.50%

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio's operating expenses stay the same and that the fee waiver remains in effect for only one year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example Virginia Portfolio (USD $)	CLASS A	CLASS B	CLASS C
After 1 Year	379	453	253
After 3 Years	566	597	493
After 5 Years	769	865	856
After 10 Years	1,354	1,530	1,880

For the shares classes listed below, you would pay the following expenses if you did not redeem your shares at the end of the period:

Expense Example, No Redemption Virginia Portfolio (USD $)	CLASS B	CLASS C
After 1 Year	153	153
After 3 Years	497	493
After 5 Years	865	856
After 10 Years	1,530	1,880

PORTFOLIO TURNOVER

The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 23% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the AMT for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of Virginia or municipal securities with interest that is otherwise exempt from Virginia state income tax.

The Portfolio may also invest in:

• forward commitments;

• zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and

• derivatives, such as options, futures, forwards and swaps.

PRINCIPAL RISKS:

• MARKET RISK: The value of the Portfolio's assets will fluctuate as the bond market fluctuates. The value of the Portfolio's investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market.

• CREDIT RISK: An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations.

• MUNICIPAL MARKET RISK: This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio's investments in municipal securities. These factors include economic conditions, political or legislative changes, uncertainties related to the tax status of municipal securities, or the rights of investors in these securities. The Portfolio's investments in Virginia municipal securities may be vulnerable to events adversely affecting its economy. Virginia has a highly diversified economy, with services as a major component. The U.S. Government, both military and civilian, plays a large role in its economy. The state benefits from increases in U.S. Government spending but is vulnerable to spending decreases. The Portfolio's investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project's ability to make payments of principal and interest on these securities.

• TAX RISK: There is no guarantee that all of the Portfolio's income will remain exempt from federal or state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in federal tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio's NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio's yield.

• INTEREST RATE RISK: Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations.

• DURATION RISK: Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. For example, a fixed-income security with a duration of three years will decrease in value by approximately 3% if interest rates increase by 1%.

• INFLATION RISK: This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio's assets can decline as can the value of the Portfolio's distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• LIQUIDITY RISK: Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing the Portfolio from selling out of these illiquid securities at an advantageous price. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. The Portfolio is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets.

• DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments.

• MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results.

As with all investments, you may lose money by investing in the Portfolio.

BAR CHART AND PERFORMANCE INFORMATION:

The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing:

• how the Portfolio's performance changed from year to year over ten years; and

• how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.

You may obtain updated performance information on the Portfolio's website at www.AllianceBernstein.com (click on "Individuals-U.S." then "Products & Performance").

The Portfolio's past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.

BAR CHART

The annual returns in the bar chart are for the Portfolio's Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown.

Calendar Year End (%)

During the period shown in the bar chart, the Portfolio's:

BEST QUARTER WAS UP 5.98%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -3.57%, 3RD QUARTER, 2008.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS

(For the periods ended December 31, 2012)

Average Annual Total Returns Virginia Portfolio		1 YEAR	5 YEARS	10 YEARS
CLASS A	[1]	3.90%	5.19%	4.89%
CLASS A Return After Taxes on Distributions	[1]	3.73%	5.11%	4.84%
CLASS A Return After Taxes on Distributions and Sale of Portfolio Shares	[1]	3.79%	4.95%	4.76%
CLASS B		3.44%	5.12%	4.77%
CLASS C		5.42%	5.12%	4.49%
Barclays Municipal Bond Index (reflects no deduction for fees, expenses or taxes)		6.78%	5.91%	5.10%

[1] Class B shares automatically convert to Class A shares after six years. The CDSC decreases over time. For Class B shares the CDSC decreases 1.00% annually to 0% after the third year.

[2] For Class C shares, the CDSC is 0% after the first year.

[1] Before Waiver

[2] The fee waiver and/or expense reimbursement agreement will remain in effect until January 31, 2014 and will be automatically extended for one-year terms thereafter unless terminated by the Adviser upon 60 days' notice to the Portfolio prior to that date.

[3] Restated to reflect current fee waiver and/or expense reimbursement.

[4] After Fee Waiver and/or Expense Reimbursement

[1] After-tax Returns: -Are shown for Class A shares only and will vary for Class B and C shares because these Classes have higher expense ratios; -Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor's tax situation and are likely to differ from those shown; and -Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.