485BPOS

As filed with the Securities and Exchange Commission on September 18, 2013

File No. 333-112207

811-21497

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. 20	x

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940

Amendment No. 23 x

ALLIANCEBERNSTEIN CORPORATE SHARES

(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:

(212) 969-1000

Emilie D. Wrapp

c/o 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, N.W.

Suite 800

Washington, D.C. 20001

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

¨ immediately upon filing pursuant to paragraph (b)

x on September 18, 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

If appropriate, check the following box:

¨ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

This Post-Effective Amendment No. 20 relates solely to shares of the AllianceBernstein Corporate Income Shares, AllianceBernstein Municipal Income Shares, AllianceBernstein Taxable Multi-Sector Income Shares and AllianceBernstein Tax-Aware Real Return Income Shares of the Registrant. No information contained in the Registrant’s Registration Statement relating to AllianceBernstein International Focus Shares is amended and superseded hereby.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, 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 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 18^th day of September, 2013.

ALLIANCEBERNSTEIN CORPORATE SHARES
By:	Robert M. Keith*
	Robert M. Keith President

Pursuant to the requirements of the Securities Act of 1933, this Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

	Signature	Title	Date
(1)	Principal Executive Officer:
	Robert M. Keith* Robert M. Keith	President and Chief Executive Officer	September 18, 2013
(2)	Principal Financial and Accounting Officer:
	/s/    Joseph J. Mantineo Joseph J. Mantineo	Treasurer and Chief Financial Officer	September 18, 2013
(3)	The 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/    Stephen J. Laffey Stephen J. Laffey (Attorney-in-fact)		September 18, 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 CORPORATE SHARES
Prospectus Date	rr_ProspectusDate	Aug. 30, 2013
ALLIANCEBERNSTEIN CORPORATE INCOME SHARES
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ALLIANCEBERNSTEIN CORPORATE INCOME SHARES
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Fund is to earn high current income.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND:
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 Fund.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) This table shows the fees and the Total Fund Operating Expenses of the Fund as 0.00% because the Adviser does not charge any fees or expenses and reimburses or pays for Fund operating expenses, except certain extraordinary expenses, taxes, brokerage costs and the interest on borrowings or certain leveraged transactions. PARTICIPANTS IN A WRAP FEE PROGRAM OR OTHER INVESTMENT PROGRAM ELIGIBLE TO INVEST IN THE FUND PAY FEES TO THE PROGRAM SPONSOR AND SHOULD REVIEW THE PROGRAM BROCHURE OR LITERATURE PROVIDED BY THE SPONSOR FOR A DISCUSSION OF FEES AND EXPENSES CHARGED.
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund 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 Fund shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 89% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	89.00%
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 Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund 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 and that the Fund’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund invests, under normal circumstances, at least 80% of its net assets in U.S. corporate bonds. The Fund may also invest in U.S. Government securities (other than U.S. Government securities that are mortgage-backed or asset-backed securities), repurchase agreements and forward contracts relating to U.S. Government securities. The Fund normally invests all of its assets in securities that are rated, at the time of purchase, at least BBB- or the equivalent. The Fund will not invest in unrated corporate debt securities. The Fund has the flexibility to invest in long- and short-term fixed-income securities. In making decisions about whether to buy or sell securities, the Adviser will consider, among other things, the strength of certain sectors of the fixed-income market relative to others, interest rates and other general market conditions and the credit quality of individual issuers. The Fund also may: invest in convertible debt securities; invest up to 10% of its assets in inflation-protected securities; invest up to 5% of its net assets in preferred stock; purchase and sell interest rate futures contracts and options; enter into swap transactions; invest in zero-coupon securities and “payment-in-kind” debentures; make secured loans of portfolio securities; and invest in U.S. Dollar-denominated fixed-income securities issued by non-U.S. companies.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Fund’s assets will fluctuate as the stock or bond market fluctuates. The value of the Fund’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. 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 Fund’s assets can decline as can the value of the Fund’s distributions. This risk is significantly greater for fixed-income securities with longer maturities. FOREIGN (NON-U.S.) RISK: Investments in securities of non-U.S. issuers may involve more risk than those of U.S. issuers. These securities may fluctuate more widely in price and may be less liquid due to adverse market, economic, political, regulatory or other factors. DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Fund, and may be subject to counterparty risk to a greater degree than more traditional investments. MANAGEMENT RISK: The Fund 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 Fund.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Fund.
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 Fund by showing: how the Fund’s performance changed from year to year over the life of the Fund; and how the Fund’s average annual returns for one year, five years and over the life of the Fund compare to those of a broad-based securities market index. The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Fund’s performance changed from year to year over the life of the Fund; and how the Fund’s average annual returns for one year, five years and over the life of the Fund compare to those of a broad-based securities market index.
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’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	Through June 30, 2013, the year-to-date unannualized return for the Fund’s shares was -3.69%.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Fund’s: BEST QUARTER WAS UP 13.58%, 2ND QUARTER, 2009; AND WORST QUARTER WAS DOWN -7.74%, 3RD QUARTER, 2008.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the period ended December 31, 2012)
ALLIANCEBERNSTEIN CORPORATE INCOME SHARES | ALLIANCEBERNSTEIN CORPORATE INCOME SHARES
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 original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	none
Total Fund Operating Expenses	rr_ExpensesOverAssets	none
After 1 Year	rr_ExpenseExampleYear01	none
After 3 Years	rr_ExpenseExampleYear03	none
After 5 Years	rr_ExpenseExampleYear05	none
After 10 Years	rr_ExpenseExampleYear10	none
2003	rr_AnnualReturn2003
2004	rr_AnnualReturn2004
2005	rr_AnnualReturn2005
2006	rr_AnnualReturn2006
2007	rr_AnnualReturn2007	4.16%
2008	rr_AnnualReturn2008	(10.22%)
2009	rr_AnnualReturn2009	28.97%
2010	rr_AnnualReturn2010	10.80%
2011	rr_AnnualReturn2011	7.67%
2012	rr_AnnualReturn2012	10.52%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2013
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(3.69%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	13.58%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(7.74%)
1 YEAR	rr_AverageAnnualReturnYear01	10.52%
5 YEARS	rr_AverageAnnualReturnYear05	8.83%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	7.77%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Dec. 11, 2006
ALLIANCEBERNSTEIN CORPORATE INCOME SHARES | Return After Taxes on Distributions | ALLIANCEBERNSTEIN CORPORATE INCOME SHARES
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	9.02%
5 YEARS	rr_AverageAnnualReturnYear05	6.80%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	5.75%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Dec. 11, 2006
ALLIANCEBERNSTEIN CORPORATE INCOME SHARES | Return After Taxes on Distributions and Sales of Fund Shares | ALLIANCEBERNSTEIN CORPORATE INCOME SHARES
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	6.79%
5 YEARS	rr_AverageAnnualReturnYear05	6.34%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	5.43%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Dec. 11, 2006
ALLIANCEBERNSTEIN CORPORATE INCOME SHARES | Barclays U.S. Credit Index
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	9.37%
5 YEARS	rr_AverageAnnualReturnYear05	7.65%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	7.01%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Dec. 11, 2006

[1] Inception date: 12/11/2006.

XML

AllianceBernstein Municipal Income Shares

ALLIANCEBERNSTEIN MUNICIPAL INCOME SHARES

INVESTMENT OBJECTIVE:

The investment objective of the Fund is to earn the highest level of current income, exempt from federal taxation, that is available consistent with what the Adviser considers to be an appropriate level of risk.

FEES AND EXPENSES OF THE FUND:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees (USD $)	AllianceBernstein Municipal Income Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	none
Exchange Fee	none

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

This table shows the fees of the Fund as 0.00% (excluding interest expense of .03%) because the Adviser does not charge any fees or expenses and reimburses or pays for Fund operating expenses, except certain extraordinary expenses, taxes, brokerage costs and the interest on borrowings or certain leveraged transactions. PARTICIPANTS IN A WRAP FEE PROGRAM OR OTHER INVESTMENT PROGRAM ELIGIBLE TO INVEST IN THE FUND PAY FEES TO THE PROGRAM SPONSOR AND SHOULD REVIEW THE PROGRAM BROCHURE OR LITERATURE PROVIDED BY THE SPONSOR FOR A DISCUSSION OF FEES AND EXPENSES CHARGED.

Annual Fund Operating Expenses		AllianceBernstein Municipal Income Shares
Management Fees		none
Other Expenses: Transfer Agent		none
Other Expenses: Interest Expense		0.03%
Other Expenses		none
Total Other Expenses		0.03%
Total Fund Operating Expenses	[1]	0.03%

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund 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 and that the Fund’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (USD $)	AllianceBernstein Municipal Income Shares
After 1 Year	3
After 3 Years	10
After 5 Years	17
After 10 Years	39

PORTFOLIO TURNOVER

The Fund 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 Fund shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 7% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Fund pursues its objective by investing principally in high-yielding municipal securities that may be non-investment grade or investment grade. As a matter of fundamental policy, the Fund 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 alternative minimum tax (“AMT”) for certain taxpayers.

The Adviser selects securities for purchase or sale based on its assessment of the securities’ risk and return characteristics as well as the securities’ impact on the overall risk and return characteristics of the Fund. In making this assessment, the Adviser takes into account various factors including the credit quality and sensitivity to interest rates of the securities under consideration and of the Fund’s other holdings.

The Fund may invest without limit in lower-rated securities (“junk bonds”), which may include securities having the lowest rating, and in unrated securities that, in the Adviser’s judgment, would be lower-rated securities if rated. The Fund may invest in fixed-income securities with any maturity or duration. The Fund will seek to increase income for shareholders by investing in longer-maturity bonds. Consistent with its objective of seeking a higher level of income, the Fund may experience greater volatility and a higher risk of loss of principal than other municipal funds.

The Fund may also invest in:

• tender option bond transactions (“TOBs”);

• forward commitments;

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

• certain types of mortgage related securities; and

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

The Fund may make short sales of securities or maintain a short position, and may use other investment techniques. The Fund may use leverage for investment purposes to increase income through the use of TOBs and derivative instruments, such as interest rate swaps.

PRINCIPAL RISKS:

• MARKET RISK: The value of the Fund’s assets will fluctuate as the stock or bond market fluctuates. The value of the Fund’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 Fund’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. To the extent that the Fund invests more of its assets in a particular state’s municipal securities, the Fund may be vulnerable to events adversely affecting that state, including economic, political and regulatory occurrences, court decisions, terrorism and catastrophic natural disasters, such as hurricanes or earthquakes. The Fund’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.

• 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 Fund’s assets can decline as can the value of the Fund’s distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• LEVERAGE RISK: To the extent the Fund uses leveraging techniques, its net asset value (“NAV”) may be more volatile because leverage tends to exaggerate the effect of changes in interest rates and any increase or decrease in the value of the Fund’s investments.

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

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

• MANAGEMENT RISK: The Fund 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 Fund.

BAR CHART AND PERFORMANCE INFORMATION:

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

• how the Fund’s performance changed from year to year over the life of the Fund; and

• how the Fund’s average annual returns for one year and over the life of the Fund compare to those of a broad-based securities market index.

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

BAR CHART

Through June 30, 2013, the year-to-date unannualized return for the Fund’s shares was -5.28%.

Calendar Year End (%)

During the period shown in the bar chart, the Fund’s:

BEST QUARTER WAS UP 6.74%, 2ND QUARTER, 2011; AND WORST QUARTER WAS DOWN -0.25%, 1ST QUARTER, 2011.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS

(For the period ended December 31, 2012)

Average Annual Total Returns	1 YEAR	SINCE INCEPTION		INCEPTION DATE
AllianceBernstein Municipal Income Shares	17.10%	10.64%	[1]	Sep. 01, 2010
AllianceBernstein Municipal Income Shares Return After Taxes on Distributions	17.00%	10.58%	[1]	Sep. 01, 2010
AllianceBernstein Municipal Income Shares Return After Taxes on Distributions and Sales of Fund Shares	12.98%	9.83%	[1]	Sep. 01, 2010
AllianceBernstein Municipal Income Shares Barclays Municipal Bond Index	6.78%	5.45%	[1]	Sep. 01, 2010

[1] If interest expenses were excluded net expenses would be 0.00%.

[1] Inception date: 09/01/2010.

XML

ALLIANCEBERNSTEIN CORPORATE INCOME SHARES

ALLIANCEBERNSTEIN CORPORATE INCOME SHARES

INVESTMENT OBJECTIVE:

The investment objective of the Fund is to earn high current income.

FEES AND EXPENSES OF THE FUND:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees (USD $)	ALLIANCEBERNSTEIN CORPORATE INCOME SHARES
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	none
Exchange Fee	none

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

This table shows the fees and the Total Fund Operating Expenses of the Fund as 0.00% because the Adviser does not charge any fees or expenses and reimburses or pays for Fund operating expenses, except certain extraordinary expenses, taxes, brokerage costs and the interest on borrowings or certain leveraged transactions. PARTICIPANTS IN A WRAP FEE PROGRAM OR OTHER INVESTMENT PROGRAM ELIGIBLE TO INVEST IN THE FUND PAY FEES TO THE PROGRAM SPONSOR AND SHOULD REVIEW THE PROGRAM BROCHURE OR LITERATURE PROVIDED BY THE SPONSOR FOR A DISCUSSION OF FEES AND EXPENSES CHARGED.

Annual Fund Operating Expenses	ALLIANCEBERNSTEIN CORPORATE INCOME SHARES
Management Fees	none
Other Expenses	none
Total Fund Operating Expenses	none

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund 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 and that the Fund’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (USD $)	ALLIANCEBERNSTEIN CORPORATE INCOME SHARES
After 1 Year	none
After 3 Years	none
After 5 Years	none
After 10 Years	none

PORTFOLIO TURNOVER

The Fund 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 Fund shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 89% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Fund invests, under normal circumstances, at least 80% of its net assets in U.S. corporate bonds. The Fund may also invest in U.S. Government securities (other than U.S. Government securities that are mortgage-backed or asset-backed securities), repurchase agreements and forward contracts relating to U.S. Government securities. The Fund normally invests all of its assets in securities that are rated, at the time of purchase, at least BBB- or the equivalent. The Fund will not invest in unrated corporate debt securities. The Fund has the flexibility to invest in long- and short-term fixed-income securities. In making decisions about whether to buy or sell securities, the Adviser will consider, among other things, the strength of certain sectors of the fixed-income market relative to others, interest rates and other general market conditions and the credit quality of individual issuers.

The Fund also may:

• invest in convertible debt securities;

• invest up to 10% of its assets in inflation-protected securities;

• invest up to 5% of its net assets in preferred stock;

• purchase and sell interest rate futures contracts and options;

• enter into swap transactions;

• invest in zero-coupon securities and “payment-in-kind” debentures;

• make secured loans of portfolio securities; and

• invest in U.S. Dollar-denominated fixed-income securities issued by non-U.S. companies.

PRINCIPAL RISKS:

• MARKET RISK: The value of the Fund’s assets will fluctuate as the stock or bond market fluctuates. The value of the Fund’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.

• 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 Fund’s assets can decline as can the value of the Fund’s distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• FOREIGN (NON-U.S.) RISK: Investments in securities of non-U.S. issuers may involve more risk than those of U.S. issuers. These securities may fluctuate more widely in price and may be less liquid due to adverse market, economic, political, regulatory or other factors.

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

• MANAGEMENT RISK: The Fund 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 Fund.

BAR CHART AND PERFORMANCE INFORMATION:

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

• how the Fund’s performance changed from year to year over the life of the Fund; and

• how the Fund’s average annual returns for one year, five years and over the life of the Fund compare to those of a broad-based securities market index.

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

BAR CHART

Through June 30, 2013, the year-to-date unannualized return for the Fund’s shares was -3.69%.

Calendar Year End (%)

During the period shown in the bar chart, the Fund’s:

BEST QUARTER WAS UP 13.58%, 2ND QUARTER, 2009; AND WORST QUARTER WAS DOWN -7.74%, 3RD QUARTER, 2008.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS

(For the period ended December 31, 2012)

Average Annual Total Returns	1 YEAR	5 YEARS	SINCE INCEPTION		INCEPTION DATE
ALLIANCEBERNSTEIN CORPORATE INCOME SHARES	10.52%	8.83%	7.77%	[1]	Dec. 11, 2006
ALLIANCEBERNSTEIN CORPORATE INCOME SHARES Return After Taxes on Distributions	9.02%	6.80%	5.75%	[1]	Dec. 11, 2006
ALLIANCEBERNSTEIN CORPORATE INCOME SHARES Return After Taxes on Distributions and Sales of Fund Shares	6.79%	6.34%	5.43%	[1]	Dec. 11, 2006
ALLIANCEBERNSTEIN CORPORATE INCOME SHARES Barclays U.S. Credit Index	9.37%	7.65%	7.01%	[1]	Dec. 11, 2006

[1] Inception date: 12/11/2006.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN CORPORATE SHARES
Prospectus Date	rr_ProspectusDate	Aug. 30, 2013
AllianceBernstein Tax-Aware Real Return Income Shares
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ALLIANCEBERNSTEIN TAX-AWARE REAL RETURN INCOME SHARES
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Fund is to maximize real after-tax return for investors subject to federal income taxation.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND:
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 Fund.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) This table shows the fees and the Total Fund Operating Expenses of the Fund as 0.00% because the Adviser does not charge any fees or expenses and reimburses or pays for Fund operating expenses, except certain extraordinary expenses, taxes, brokerage costs and the interest on borrowings or certain leveraged transactions. PARTICIPANTS IN A WRAP FEE PROGRAM OR OTHER INVESTMENT PROGRAM ELIGIBLE TO INVEST IN THE FUND PAY FEES TO THE PROGRAM SPONSOR AND SHOULD REVIEW THE PROGRAM BROCHURE OR LITERATURE PROVIDED BY THE SPONSOR FOR A DISCUSSION OF FEES AND EXPENSES CHARGED.
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund 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 Fund shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 19% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	19.00%
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 Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund 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 and that the Fund’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund seeks real after-tax return for separately managed account (“SMA”) investors in wrap fee programs or investors in other eligible investment programs who are subject to federal income taxes. Real return is the rate of total return (including income and capital gains) after adjusting for inflation. The Fund is not designed as a stand-alone investment. Its performance and objectives should be evaluated only in the broader context of an SMA investor’s account, of which an investment in the Fund is only a part. The Fund pursues its objective by investing primarily in municipal securities that pay interest exempt from federal taxation and by using inflation protection derivatives instruments, such as inflation swap agreements, as described below. Municipal securities may pay interest that is subject to the federal alternative minimum tax (“AMT”) for certain taxpayers. The Adviser selects securities for purchase or sale based on its assessment of the securities’ risk and return characteristics as well as the securities’ impact on the overall risk and return characteristics of the Fund. In making this assessment, the Adviser takes into account various factors including the credit quality and sensitivity to interest rates of the securities under consideration and of the Fund’s other holdings. The Fund may invest in fixed-income securities with any maturity or duration and investment grade bonds subject to taxation if the Adviser determines that they offer higher after-tax returns than comparable municipal bonds. While the Fund currently expects to invest principally in investment grade securities, the Fund may invest without limit in fixed-income securities that are not investment grade (“junk bonds”). The Fund may make significant use of derivatives, including swaps, futures, options and forwards. To provide inflation protection, the Fund will enter into various kinds of inflation swap agreements. The Fund may use other inflation-protected instruments as well. Payments to the Fund pursuant to swap agreements will result in taxable income, either ordinary income or capital gains, rather than income exempt from federal taxation. Because the Fund is expected to be a significant vehicle for SMA investors and other investment program investors to achieve inflation protection for some or all of their overall accounts, the Fund may at times seek a substantial amount of inflation protection and, consequently, may generate substantial taxable income. It is expected that the Fund’s primary use of derivatives will be for the purposes of inflation protection. The Fund may also invest in: tender option bond transactions (“TOBs”); forward commitments; zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; and certain types of mortgage-related securities. The Fund may make short sales of securities or maintain a short position, and may use other investment techniques. The Fund may use leverage for investment purposes to increase income through the use of the cash made available by TOBs and derivative instruments, such as interest rate swaps, to make other investments in accordance with its investment objective.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Fund’s assets will fluctuate as the stock or bond market fluctuates. The value of the Fund’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 (commonly referred to as “junk bonds”) tend to have a higher probability that an issuer will default or fail to meet its payment obligations. 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. 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 Fund’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. To the extent that the Fund invests more of its assets in a particular state’s municipal securities, the Fund may be vulnerable to events adversely affecting that state, including economic, political and regulatory occurrences, court decisions, terrorism and catastrophic natural disasters, such as hurricanes or earthquakes. The Fund’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. 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 Fund’s assets can decline as can the value of the Fund’s distributions. This risk is significantly greater for fixed-income securities with longer maturities. DERIVATIVES RISK: The Fund’s investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Fund, and may be subject to counter-party risk to a greater degree than more traditional investments. The use of inflation protection derivatives to help meet the Fund’s investment objective may not be successful. LEVERAGE RISK: To the extent the Fund uses leveraging techniques, its net asset value (“NAV”) may be more volatile because leverage tends to exaggerate the effect of changes in interest rates and any increase or decrease in the value of the Fund’s investments. LIQUIDITY RISK: Liquidity risk exists when particular investments, such as lower-rated securities, are difficult to purchase or sell, possibly preventing the Fund from selling out of these illiquid securities at an advantageous price. The Fund is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. MANAGEMENT RISK: The Fund 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 Fund.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Fund.
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 Fund by showing: how the Fund’s performance changed over the life of the Fund; and how the Fund’s average annual returns for one year and over the life of the Fund compare to those of a broad-based securities market index. The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Fund’s performance changed over the life of the Fund; and how the Fund’s average annual returns for one year and over the life of the Fund compare to those of a broad-based securities market index.
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’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	Through June 30, 2013, the year-to-date unannualized return for the Fund’s shares was -6.77%.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Fund’s: BEST QUARTER WAS UP 4.28%, 1ST QUARTER, 2012; AND WORST QUARTER WAS DOWN -.77%, 2ND QUARTER, 2012.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the period ended December 31, 2012)
AllianceBernstein Tax-Aware Real Return Income Shares | AllianceBernstein Tax-Aware Real Return Income Shares
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 original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	none
Total Fund Operating Expenses	rr_ExpensesOverAssets	none
After 1 Year	rr_ExpenseExampleYear01	none
After 3 Years	rr_ExpenseExampleYear03	none
After 5 Years	rr_ExpenseExampleYear05	none
After 10 Years	rr_ExpenseExampleYear10	none
2003	rr_AnnualReturn2003
2004	rr_AnnualReturn2004
2005	rr_AnnualReturn2005
2006	rr_AnnualReturn2006
2007	rr_AnnualReturn2007
2008	rr_AnnualReturn2008
2009	rr_AnnualReturn2009
2010	rr_AnnualReturn2010
2011	rr_AnnualReturn2011
2012	rr_AnnualReturn2012	8.16%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2013
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(6.77%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2012
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	4.28%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2012
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(0.77%)
1 YEAR	rr_AverageAnnualReturnYear01	8.16%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	5.25%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	May 02, 2011
AllianceBernstein Tax-Aware Real Return Income Shares | Return After Taxes on Distributions | AllianceBernstein Tax-Aware Real Return Income Shares
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	8.03%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	5.18%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	May 02, 2011
AllianceBernstein Tax-Aware Real Return Income Shares | Return After Taxes on Distributions and Sales of Fund Shares | AllianceBernstein Tax-Aware Real Return Income Shares
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	5.70%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	4.64%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	May 02, 2011
AllianceBernstein Tax-Aware Real Return Income Shares | Barclays Capital TIPS 1-10 Year Index
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	5.04%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	5.54%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	May 02, 2011

[1] Inception date: 05/02/2011.

XML

AllianceBernstein Tax-Aware Real Return Income Shares

ALLIANCEBERNSTEIN TAX-AWARE REAL RETURN INCOME SHARES

INVESTMENT OBJECTIVE:

The investment objective of the Fund is to maximize real after-tax return for investors subject to federal income taxation.

FEES AND EXPENSES OF THE FUND:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees (USD $)	AllianceBernstein Tax-Aware Real Return Income Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	none
Exchange Fee	none

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

This table shows the fees and the Total Fund Operating Expenses of the Fund as 0.00% because the Adviser does not charge any fees or expenses and reimburses or pays for Fund operating expenses, except certain extraordinary expenses, taxes, brokerage costs and the interest on borrowings or certain leveraged transactions. PARTICIPANTS IN A WRAP FEE PROGRAM OR OTHER INVESTMENT PROGRAM ELIGIBLE TO INVEST IN THE FUND PAY FEES TO THE PROGRAM SPONSOR AND SHOULD REVIEW THE PROGRAM BROCHURE OR LITERATURE PROVIDED BY THE SPONSOR FOR A DISCUSSION OF FEES AND EXPENSES CHARGED.

Annual Fund Operating Expenses	AllianceBernstein Tax-Aware Real Return Income Shares
Management Fees	none
Other Expenses	none
Total Fund Operating Expenses	none

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund 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 and that the Fund’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (USD $)	AllianceBernstein Tax-Aware Real Return Income Shares
After 1 Year	none
After 3 Years	none
After 5 Years	none
After 10 Years	none

PORTFOLIO TURNOVER

The Fund 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 Fund shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 19% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Fund seeks real after-tax return for separately managed account (“SMA”) investors in wrap fee programs or investors in other eligible investment programs who are subject to federal income taxes. Real return is the rate of total return (including income and capital gains) after adjusting for inflation. The Fund is not designed as a stand-alone investment. Its performance and objectives should be evaluated only in the broader context of an SMA investor’s account, of which an investment in the Fund is only a part.

The Fund pursues its objective by investing primarily in municipal securities that pay interest exempt from federal taxation and by using inflation protection derivatives instruments, such as inflation swap agreements, as described below. Municipal securities may pay interest that is subject to the federal alternative minimum tax (“AMT”) for certain taxpayers.

The Adviser selects securities for purchase or sale based on its assessment of the securities’ risk and return characteristics as well as the securities’ impact on the overall risk and return characteristics of the Fund. In making this assessment, the Adviser takes into account various factors including the credit quality and sensitivity to interest rates of the securities under consideration and of the Fund’s other holdings.

The Fund may invest in fixed-income securities with any maturity or duration and investment grade bonds subject to taxation if the Adviser determines that they offer higher after-tax returns than comparable municipal bonds. While the Fund currently expects to invest principally in investment grade securities, the Fund may invest without limit in fixed-income securities that are not investment grade (“junk bonds”).

The Fund may make significant use of derivatives, including swaps, futures, options and forwards. To provide inflation protection, the Fund will enter into various kinds of inflation swap agreements. The Fund may use other inflation-protected instruments as well. Payments to the Fund pursuant to swap agreements will result in taxable income, either ordinary income or capital gains, rather than income exempt from federal taxation. Because the Fund is expected to be a significant vehicle for SMA investors and other investment program investors to achieve inflation protection for some or all of their overall accounts, the Fund may at times seek a substantial amount of inflation protection and, consequently, may generate substantial taxable income. It is expected that the Fund’s primary use of derivatives will be for the purposes of inflation protection.

The Fund may also invest in:

• tender option bond transactions (“TOBs”);

• forward commitments;

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

• certain types of mortgage-related securities.

The Fund may make short sales of securities or maintain a short position, and may use other investment techniques. The Fund may use leverage for investment purposes to increase income through the use of the cash made available by TOBs and derivative instruments, such as interest rate swaps, to make other investments in accordance with its investment objective.

PRINCIPAL RISKS:

• MARKET RISK: The value of the Fund’s assets will fluctuate as the stock or bond market fluctuates. The value of the Fund’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 (commonly referred to as “junk bonds”) tend to have a higher probability that an issuer will default or fail to meet its payment obligations.

• 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.

• 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 Fund’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. To the extent that the Fund invests more of its assets in a particular state’s municipal securities, the Fund may be vulnerable to events adversely affecting that state, including economic, political and regulatory occurrences, court decisions, terrorism and catastrophic natural disasters, such as hurricanes or earthquakes. The Fund’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.

• 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 Fund’s assets can decline as can the value of the Fund’s distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• DERIVATIVES RISK: The Fund’s investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Fund, and may be subject to counter-party risk to a greater degree than more traditional investments. The use of inflation protection derivatives to help meet the Fund’s investment objective may not be successful.

• LEVERAGE RISK: To the extent the Fund uses leveraging techniques, its net asset value (“NAV”) may be more volatile because leverage tends to exaggerate the effect of changes in interest rates and any increase or decrease in the value of the Fund’s investments.

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

• MANAGEMENT RISK: The Fund 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 Fund.

BAR CHART AND PERFORMANCE INFORMATION:

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

• how the Fund’s performance changed over the life of the Fund; and

• how the Fund’s average annual returns for one year and over the life of the Fund compare to those of a broad-based securities market index.

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

BAR CHART

Through June 30, 2013, the year-to-date unannualized return for the Fund’s shares was -6.77%.

Calendar Year End (%)

During the period shown in the bar chart, the Fund’s:

BEST QUARTER WAS UP 4.28%, 1ST QUARTER, 2012; AND WORST QUARTER WAS DOWN -.77%, 2ND QUARTER, 2012.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS
(For the period ended December 31, 2012)

Average Annual Total Returns	1 YEAR	SINCE INCEPTION		INCEPTION DATE
AllianceBernstein Tax-Aware Real Return Income Shares	8.16%	5.25%	[1]	May 02, 2011
AllianceBernstein Tax-Aware Real Return Income Shares Return After Taxes on Distributions	8.03%	5.18%	[1]	May 02, 2011
AllianceBernstein Tax-Aware Real Return Income Shares Return After Taxes on Distributions and Sales of Fund Shares	5.70%	4.64%	[1]	May 02, 2011
AllianceBernstein Tax-Aware Real Return Income Shares Barclays Capital TIPS 1-10 Year Index	5.04%	5.54%	[1]	May 02, 2011

[1] Inception date: 05/02/2011.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN CORPORATE SHARES
Prospectus Date	rr_ProspectusDate	Aug. 30, 2013
Document Creation Date	dei_DocumentCreationDate	Aug. 30, 2013

XML

AllianceBernstein Taxable Multi-Sector Income Shares

ALLIANCEBERNSTEIN TAXABLE MULTI-SECTOR INCOME SHARES

INVESTMENT OBJECTIVE:

The investment objective of the Fund is to generate income and price appreciation.

FEES AND EXPENSES OF THE FUND:

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

SHAREHOLDER FEES (fees paid directly from your investment)

Shareholder Fees (USD $)	AllianceBernstein Taxable Multi-Sector Income Shares
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none
Maximum Deferred Sales Charge (Load) (as a percentage of original purchase price or redemption proceeds, whichever is lower)	none
Exchange Fee	none

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

This table shows the fees and the Total Fund Operating Expenses of the Fund as 0.00% because the Adviser does not charge any fees or expenses and reimburses or pays for Fund operating expenses, except certain extraordinary expenses, taxes, brokerage costs and the interest on borrowings or certain leveraged transactions. PARTICIPANTS IN A WRAP FEE PROGRAM OR OTHER INVESTMENT PROGRAM ELIGIBLE TO INVEST IN THE FUND PAY FEES TO THE PROGRAM SPONSOR AND SHOULD REVIEW THE PROGRAM BROCHURE OR LITERATURE PROVIDED BY THE SPONSOR FOR A DISCUSSION OF FEES AND EXPENSES CHARGED.

Annual Fund Operating Expenses	AllianceBernstein Taxable Multi-Sector Income Shares
Management Fees	none
Other Expenses	none
Total Fund Operating Expenses	none

EXAMPLES

The Examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund 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 and that the Fund’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example (USD $)	AllianceBernstein Taxable Multi-Sector Income Shares
After 1 Year	none
After 3 Years	none
After 5 Years	none
After 10 Years	none

PORTFOLIO TURNOVER

The Fund 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 Fund shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 66% of the average value of its portfolio.

PRINCIPAL STRATEGIES:

The Fund invests, under normal circumstances, at least 80% of its net assets in fixed-income securities. The Fund may invest in a broad range of securities in both developed and emerging markets. The Fund may invest across all fixed-income sectors, including corporate and U.S. and non-U.S. Government securities. The Fund may invest up to 50% of its assets in below investment grade bonds (“junk bonds”). The Fund expects to invest in readily marketable fixed-income securities with a range of maturities from short- to long-term.

The Fund may invest without limit in U.S. Dollar-denominated foreign fixed-income securities and may invest up to 50% of its assets in non-U.S. Dollar-denominated foreign fixed-income securities. These investments may include, in each case, developed and emerging market debt securities.

The Fund may invest in mortgage-related and other asset-backed securities, loan participations, inflation-protected securities, structured securities, variable, floating, and inverse floating rate instruments and preferred stock, and may use other investment techniques. The Fund may use leverage for investment purposes. The Fund intends, among other things, to enter into transactions such as reverse repurchase agreements, forward contracts, and dollar rolls. The Fund may invest, without limit, in derivatives, such as options, futures, forwards, or swap agreements.

Currencies can have a dramatic effect on returns of non-U.S. Dollar-denominated fixed-income securities, significantly adding to returns in some years and greatly diminishing them in others. The Adviser evaluates currency and fixed-income positions separately and may seek to hedge the currency exposure resulting from the Fund’s fixed-income securities positions when it finds the currency exposure unattractive. To hedge a portion of its currency risk, the Fund may from time to time invest in currency-related derivatives, including forward currency exchange contracts, futures, options on futures, swaps and options. The Adviser may also seek investment opportunities by taking long or short positions in currencies through the use of currency-related derivatives.

The Adviser selects securities for purchase or sale based on its assessment of the securities’ risk and return characteristics as well as the securities’ impact on the overall risk and return characteristics of the Fund. In making this assessment, the Adviser takes into account various factors including the credit quality and sensitivity to interest rates of the securities under consideration and of the Fund’s other holdings.

PRINCIPAL RISKS:

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

• 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.

• 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.

• BELOW INVESTMENT GRADE SECURITIES RISK: Investments in fixed-income securities with lower ratings (commonly known as “junk bonds”) tend to have a higher probability that an issuer will default or fail to meet its payment obligations. These securities may be subject to greater price volatility due to such factors as specific corporate developments, interest rate sensitivity, negative perceptions of the junk bond market generally and less secondary market liquidity.

• 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 Fund’s assets can decline as can the value of the Fund’s distributions. This risk is significantly greater for fixed-income securities with longer maturities.

• FOREIGN (NON-U.S.) RISK: Investments in securities of non-U.S. issuers may involve more risk than those of U.S. issuers. These securities may fluctuate more widely in price and may be less liquid due to adverse market, economic, political, regulatory or other factors.

• EMERGING MARKET RISK: Investments in emerging market countries may have more risk because the markets are less developed and less liquid as well as being subject to increased economic, political, regulatory or other uncertainties.

• CURRENCY RISK: Fluctuations in currency exchange risk may negatively affect the value of the Fund’s investments or reduce its returns.

• PREPAYMENT RISK: The value of mortgage-related or asset-backed securities may be particularly sensitive to changes in prevailing interest rates. Early payments of principal on some mortgage-related securities may occur during periods of falling mortgage interest rates and expose the Fund to a lower rate of return upon reinvestment of principal. Early payments associated with mortgage-related securities cause these securities to experience significantly greater price and yield volatility than is experienced by traditional fixed-income securities. During periods of rising interest rates, a reduction in prepayments may increase the effective life of mortgage-related securities, subjecting them to greater risk of decline in market value in response to rising interest rates. If the life of a mortgage-related security is inaccurately predicted, the Fund may not be able to realize the rate of return it expected.

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

• LEVERAGE RISK: To the extent the Fund uses leveraging techniques, its net asset value (“NAV”) may be more volatile because leverage tends to exaggerate the effect of changes in interest rates and any increase or decrease in the value of the Fund’s investments.

• MANAGEMENT RISK: The Fund 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 Fund.

BAR CHART AND PERFORMANCE INFORMATION:

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

• how the Fund’s performance changed from year to year over the life of the Fund; and

• how the Fund’s average annual returns for one year and over the life of the Fund compare to those of a broad-based securities market index.

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

BAR CHART

Through June 30, 2013, the year-to-date unannualized return for the Fund’s shares was -0.49%.

Calendar Year End (%)

During the period shown in the bar chart, the Fund’s:

BEST QUARTER WAS UP 2.39%, 2ND QUARTER, 2012; AND WORST QUARTER WAS DOWN -0.50%, 3RD QUARTER, 2011.

PERFORMANCE TABLE
AVERAGE ANNUAL TOTAL RETURNS

(For the period ended December 31, 2012)

Average Annual Total Returns	1 YEAR	SINCE INCEPTION		INCEPTION DATE
AllianceBernstein Taxable Multi-Sector Income Shares	4.74%	4.16%	[1]	Sep. 15, 2010
AllianceBernstein Taxable Multi-Sector Income Shares Return After Taxes on Distributions	3.32%	2.82%	[1]	Sep. 15, 2010
AllianceBernstein Taxable Multi-Sector Income Shares Return After Taxes on Distributions and Sales of Fund Shares	3.44%	2.84%	[1]	Sep. 15, 2010
AllianceBernstein Taxable Multi-Sector Income Shares Barclays U.S. Aggregate ex Government Bond Index	5.76%	5.55%	[1]	Sep. 15, 2010
AllianceBernstein Taxable Multi-Sector Income Shares Barclays U.S. Aggregate ex Government Bond and ex MBS Index	9.34%	7.32%	[1]	Sep. 15, 2010

[1] Inception date: 09/15/2010.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN CORPORATE SHARES
Prospectus Date	rr_ProspectusDate	Aug. 30, 2013
AllianceBernstein Municipal Income Shares
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ALLIANCEBERNSTEIN MUNICIPAL INCOME SHARES
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Fund is to earn the highest level of current income, exempt from federal taxation, that is available consistent with what the Adviser considers to be an appropriate level of risk.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND:
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 Fund.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) This table shows the fees of the Fund as 0.00% (excluding interest expense of .03%) because the Adviser does not charge any fees or expenses and reimburses or pays for Fund operating expenses, except certain extraordinary expenses, taxes, brokerage costs and the interest on borrowings or certain leveraged transactions. PARTICIPANTS IN A WRAP FEE PROGRAM OR OTHER INVESTMENT PROGRAM ELIGIBLE TO INVEST IN THE FUND PAY FEES TO THE PROGRAM SPONSOR AND SHOULD REVIEW THE PROGRAM BROCHURE OR LITERATURE PROVIDED BY THE SPONSOR FOR A DISCUSSION OF FEES AND EXPENSES CHARGED.
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund 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 Fund shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 7% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	7.00%
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 Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund 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 and that the Fund’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund pursues its objective by investing principally in high-yielding municipal securities that may be non-investment grade or investment grade. As a matter of fundamental policy, the Fund 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 alternative minimum tax (“AMT”) for certain taxpayers. The Adviser selects securities for purchase or sale based on its assessment of the securities’ risk and return characteristics as well as the securities’ impact on the overall risk and return characteristics of the Fund. In making this assessment, the Adviser takes into account various factors including the credit quality and sensitivity to interest rates of the securities under consideration and of the Fund’s other holdings. The Fund may invest without limit in lower-rated securities (“junk bonds”), which may include securities having the lowest rating, and in unrated securities that, in the Adviser’s judgment, would be lower-rated securities if rated. The Fund may invest in fixed-income securities with any maturity or duration. The Fund will seek to increase income for shareholders by investing in longer-maturity bonds. Consistent with its objective of seeking a higher level of income, the Fund may experience greater volatility and a higher risk of loss of principal than other municipal funds. The Fund may also invest in: tender option bond transactions (“TOBs”); forward commitments; zero-coupon municipal securities and variable, floating and inverse floating rate municipal securities; certain types of mortgage related securities; and derivatives, such as options, futures, forwards and swaps. The Fund may make short sales of securities or maintain a short position, and may use other investment techniques. The Fund may use leverage for investment purposes to increase income through the use of TOBs and derivative instruments, such as interest rate swaps.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Fund’s assets will fluctuate as the stock or bond market fluctuates. The value of the Fund’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 Fund’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. To the extent that the Fund invests more of its assets in a particular state’s municipal securities, the Fund may be vulnerable to events adversely affecting that state, including economic, political and regulatory occurrences, court decisions, terrorism and catastrophic natural disasters, such as hurricanes or earthquakes. The Fund’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. 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 Fund’s assets can decline as can the value of the Fund’s distributions. This risk is significantly greater for fixed-income securities with longer maturities. LEVERAGE RISK: To the extent the Fund uses leveraging techniques, its net asset value (“NAV”) may be more volatile because leverage tends to exaggerate the effect of changes in interest rates and any increase or decrease in the value of the Fund’s investments. LIQUIDITY RISK: Liquidity risk exists when particular investments, such as lower-rated securities, are difficult to purchase or sell, possibly preventing the Fund from selling out of these illiquid securities at an advantageous price. The Fund is subject to liquidity risk because the market for municipal securities is generally smaller than many other markets. Derivatives and securities involving substantial market and credit risk tend to involve greater liquidity risk. DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Fund, and may be subject to counterparty risk to a greater degree than more traditional investments. MANAGEMENT RISK: The Fund 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 Fund.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Fund.
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 Fund by showing: how the Fund’s performance changed from year to year over the life of the Fund; and how the Fund’s average annual returns for one year and over the life of the Fund compare to those of a broad-based securities market index. The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Fund’s performance changed from year to year over the life of the Fund; and how the Fund’s average annual returns for one year and over the life of the Fund compare to those of a broad-based securities market index.
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’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	Through June 30, 2013, the year-to-date unannualized return for the Fund’s shares was -5.28%.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Fund’s: BEST QUARTER WAS UP 6.74%, 2ND QUARTER, 2011; AND WORST QUARTER WAS DOWN -0.25%, 1ST QUARTER, 2011.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the period ended December 31, 2012)
AllianceBernstein Municipal Income Shares | AllianceBernstein Municipal Income Shares
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 original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	none
Other Expenses: Transfer Agent	rr_Component1OtherExpensesOverAssets	none
Other Expenses: Interest Expense	rr_Component2OtherExpensesOverAssets	0.03%
Other Expenses	rr_Component3OtherExpensesOverAssets	none
Total Other Expenses	rr_OtherExpensesOverAssets	0.03%
Total Fund Operating Expenses	rr_ExpensesOverAssets	0.03%	[1]
After 1 Year	rr_ExpenseExampleYear01	3
After 3 Years	rr_ExpenseExampleYear03	10
After 5 Years	rr_ExpenseExampleYear05	17
After 10 Years	rr_ExpenseExampleYear10	$ 39
2003	rr_AnnualReturn2003
2004	rr_AnnualReturn2004
2005	rr_AnnualReturn2005
2006	rr_AnnualReturn2006
2007	rr_AnnualReturn2007
2008	rr_AnnualReturn2008
2009	rr_AnnualReturn2009
2010	rr_AnnualReturn2010
2011	rr_AnnualReturn2011	15.04%
2012	rr_AnnualReturn2012	17.10%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2013
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(5.28%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2011
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	6.74%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(0.25%)
1 YEAR	rr_AverageAnnualReturnYear01	17.10%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	10.64%	[2]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Sep. 01, 2010
AllianceBernstein Municipal Income Shares | Return After Taxes on Distributions | AllianceBernstein Municipal Income Shares
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	17.00%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	10.58%	[2]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Sep. 01, 2010
AllianceBernstein Municipal Income Shares | Return After Taxes on Distributions and Sales of Fund Shares | AllianceBernstein Municipal Income Shares
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	12.98%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	9.83%	[2]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Sep. 01, 2010
AllianceBernstein Municipal Income Shares | Barclays Municipal Bond Index
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	6.78%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	5.45%	[2]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Sep. 01, 2010

[1] If interest expenses were excluded net expenses would be 0.00%.

[2] Inception date: 09/01/2010.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	ALLIANCEBERNSTEIN CORPORATE SHARES
Prospectus Date	rr_ProspectusDate	Aug. 30, 2013
AllianceBernstein Taxable Multi-Sector Income Shares
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	ALLIANCEBERNSTEIN TAXABLE MULTI-SECTOR INCOME SHARES
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The investment objective of the Fund is to generate income and price appreciation.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND:
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 Fund.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment) This table shows the fees and the Total Fund Operating Expenses of the Fund as 0.00% because the Adviser does not charge any fees or expenses and reimburses or pays for Fund operating expenses, except certain extraordinary expenses, taxes, brokerage costs and the interest on borrowings or certain leveraged transactions. PARTICIPANTS IN A WRAP FEE PROGRAM OR OTHER INVESTMENT PROGRAM ELIGIBLE TO INVEST IN THE FUND PAY FEES TO THE PROGRAM SPONSOR AND SHOULD REVIEW THE PROGRAM BROCHURE OR LITERATURE PROVIDED BY THE SPONSOR FOR A DISCUSSION OF FEES AND EXPENSES CHARGED.
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund 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 Fund shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 66% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	66.00%
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 Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund 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 and that the Fund’s operating expenses stay the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	PRINCIPAL STRATEGIES:
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund invests, under normal circumstances, at least 80% of its net assets in fixed-income securities. The Fund may invest in a broad range of securities in both developed and emerging markets. The Fund may invest across all fixed-income sectors, including corporate and U.S. and non-U.S. Government securities. The Fund may invest up to 50% of its assets in below investment grade bonds (“junk bonds”). The Fund expects to invest in readily marketable fixed-income securities with a range of maturities from short- to long-term. The Fund may invest without limit in U.S. Dollar-denominated foreign fixed-income securities and may invest up to 50% of its assets in non-U.S. Dollar-denominated foreign fixed-income securities. These investments may include, in each case, developed and emerging market debt securities. The Fund may invest in mortgage-related and other asset-backed securities, loan participations, inflation-protected securities, structured securities, variable, floating, and inverse floating rate instruments and preferred stock, and may use other investment techniques. The Fund may use leverage for investment purposes. The Fund intends, among other things, to enter into transactions such as reverse repurchase agreements, forward contracts, and dollar rolls. The Fund may invest, without limit, in derivatives, such as options, futures, forwards, or swap agreements. Currencies can have a dramatic effect on returns of non-U.S. Dollar-denominated fixed-income securities, significantly adding to returns in some years and greatly diminishing them in others. The Adviser evaluates currency and fixed-income positions separately and may seek to hedge the currency exposure resulting from the Fund’s fixed-income securities positions when it finds the currency exposure unattractive. To hedge a portion of its currency risk, the Fund may from time to time invest in currency-related derivatives, including forward currency exchange contracts, futures, options on futures, swaps and options. The Adviser may also seek investment opportunities by taking long or short positions in currencies through the use of currency-related derivatives. The Adviser selects securities for purchase or sale based on its assessment of the securities’ risk and return characteristics as well as the securities’ impact on the overall risk and return characteristics of the Fund. In making this assessment, the Adviser takes into account various factors including the credit quality and sensitivity to interest rates of the securities under consideration and of the Fund’s other holdings.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS:
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Fund’s assets will fluctuate as the stock or bond market fluctuates. The value of the Fund’s investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. 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. 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. BELOW INVESTMENT GRADE SECURITIES RISK: Investments in fixed-income securities with lower ratings (commonly known as “junk bonds”) tend to have a higher probability that an issuer will default or fail to meet its payment obligations. These securities may be subject to greater price volatility due to such factors as specific corporate developments, interest rate sensitivity, negative perceptions of the junk bond market generally and less secondary market liquidity. 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 Fund’s assets can decline as can the value of the Fund’s distributions. This risk is significantly greater for fixed-income securities with longer maturities. FOREIGN (NON-U.S.) RISK: Investments in securities of non-U.S. issuers may involve more risk than those of U.S. issuers. These securities may fluctuate more widely in price and may be less liquid due to adverse market, economic, political, regulatory or other factors. EMERGING MARKET RISK: Investments in emerging market countries may have more risk because the markets are less developed and less liquid as well as being subject to increased economic, political, regulatory or other uncertainties. CURRENCY RISK: Fluctuations in currency exchange risk may negatively affect the value of the Fund’s investments or reduce its returns. PREPAYMENT RISK: The value of mortgage-related or asset-backed securities may be particularly sensitive to changes in prevailing interest rates. Early payments of principal on some mortgage-related securities may occur during periods of falling mortgage interest rates and expose the Fund to a lower rate of return upon reinvestment of principal. Early payments associated with mortgage-related securities cause these securities to experience significantly greater price and yield volatility than is experienced by traditional fixed-income securities. During periods of rising interest rates, a reduction in prepayments may increase the effective life of mortgage-related securities, subjecting them to greater risk of decline in market value in response to rising interest rates. If the life of a mortgage-related security is inaccurately predicted, the Fund may not be able to realize the rate of return it expected. DERIVATIVES RISK: Investments in derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Fund, and may be subject to counterparty risk to a greater degree than more traditional investments. LEVERAGE RISK: To the extent the Fund uses leveraging techniques, its net asset value (“NAV”) may be more volatile because leverage tends to exaggerate the effect of changes in interest rates and any increase or decrease in the value of the Fund’s investments. MANAGEMENT RISK: The Fund 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 Fund.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Fund.
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 Fund by showing: how the Fund’s performance changed from year to year over the life of the Fund; and how the Fund’s average annual returns for one year and over the life of the Fund compare to those of a broad-based securities market index. The Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Fund’s performance changed from year to year over the life of the Fund; and how the Fund’s average annual returns for one year and over the life of the Fund compare to those of a broad-based securities market index.
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’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	Through June 30, 2013, the year-to-date unannualized return for the Fund’s shares was -0.49%.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Fund’s: BEST QUARTER WAS UP 2.39%, 2ND QUARTER, 2012; AND WORST QUARTER WAS DOWN -0.50%, 3RD QUARTER, 2011.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the period ended December 31, 2012)
AllianceBernstein Taxable Multi-Sector Income Shares | AllianceBernstein Taxable Multi-Sector Income Shares
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 original purchase price or redemption proceeds, whichever is lower)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none
Exchange Fee	rr_ExchangeFee	none
Management Fees	rr_ManagementFeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	none
Total Fund Operating Expenses	rr_ExpensesOverAssets	none
After 1 Year	rr_ExpenseExampleYear01	none
After 3 Years	rr_ExpenseExampleYear03	none
After 5 Years	rr_ExpenseExampleYear05	none
After 10 Years	rr_ExpenseExampleYear10	none
2003	rr_AnnualReturn2003
2004	rr_AnnualReturn2004
2005	rr_AnnualReturn2005
2006	rr_AnnualReturn2006
2007	rr_AnnualReturn2007
2008	rr_AnnualReturn2008
2009	rr_AnnualReturn2009
2010	rr_AnnualReturn2010
2011	rr_AnnualReturn2011	5.27%
2012	rr_AnnualReturn2012	4.74%
Year to Date Return, Label	rr_YearToDateReturnLabel	year-to-date
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2013
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(0.49%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2012
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	2.39%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(0.50%)
1 YEAR	rr_AverageAnnualReturnYear01	4.74%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	4.16%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Sep. 15, 2010
AllianceBernstein Taxable Multi-Sector Income Shares | Return After Taxes on Distributions | AllianceBernstein Taxable Multi-Sector Income Shares
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	3.32%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	2.82%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Sep. 15, 2010
AllianceBernstein Taxable Multi-Sector Income Shares | Return After Taxes on Distributions and Sales of Fund Shares | AllianceBernstein Taxable Multi-Sector Income Shares
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	3.44%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	2.84%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Sep. 15, 2010
AllianceBernstein Taxable Multi-Sector Income Shares | Barclays U.S. Aggregate ex Government Bond Index
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	5.76%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	5.55%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Sep. 15, 2010
AllianceBernstein Taxable Multi-Sector Income Shares | Barclays U.S. Aggregate ex Government Bond and ex MBS Index
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	9.34%
SINCE INCEPTION	rr_AverageAnnualReturnSinceInception	7.32%	[1]
INCEPTION DATE	rr_AverageAnnualReturnInceptionDate	Sep. 15, 2010

[1] Inception date: 09/15/2010.

XML

Document and Entity Information	12 Months Ended
	Aug. 30, 2013
Risk/Return:
Document Type	485BPOS
Document Period End Date	Apr. 30, 2013
Registrant Name	ALLIANCEBERNSTEIN CORPORATE SHARES
Central Index Key	0001274676
Amendment Flag	false
Document Creation Date	Aug. 30, 2013
Document Effective Date	Aug. 30, 2013
Prospectus Date	Aug. 30, 2013