Prospectus: Risk/Return: Document Type Document Period End Date Registrant Name Central Index Key Amendment Flag Amendment Description Trading Symbol Document Creation Date Document Effective Date Prospectus Date Document [Axis] Prospectus Performance Measure [Axis] Before Taxes Return After Taxes on Distributions and Sale of Strategy Shares After Taxes on Distributions and Sales After Taxes on Distributions Return After Taxes on Distributions Series [Axis] Series S000010514 [Member] AllianceBernstein Wealth Appreciation Strategy Member AllianceBernstein Wealth Appreciation Strategy Share Class [Axis] Share Classes Advisor Class,AllianceBernstein Wealth Appreciation Strategy Member ADVISOR CLASS SHARES ADVISOR CLASS C000029029 [Member] Class A,AllianceBernstein Wealth Appreciation Strategy Member CLASS A SHARES CLASS A C000029026 [Member] CLASS B SHARES CLASS B Class B,AllianceBernstein Wealth Appreciation Strategy Member C000029027 [Member] Class C,AllianceBernstein Wealth Appreciation Strategy Member CLASS C SHARES CLASS C C000029028 [Member] CLASS I C000029032 [Member] Class I,AllianceBernstein Wealth Appreciation Strategy Member CLASS I SHARES Class K,AllianceBernstein Wealth Appreciation Strategy Member CLASS K SHARES CLASS K C000029031 [Member] C000029030 [Member] CLASS R Class R,AllianceBernstein Wealth Appreciation Strategy Member CLASS R SHARES Risk/Return [Heading] Objective [Heading] Objective, Primary [Text Block] Objective, Secondary [Text Block] Expense [Heading] Expense Narrative [Text Block] Shareholder Fees Caption [Text] Shareholder Fees [Table] Operating Expenses Caption [Text] Annual Fund Operating Expenses [Table] Expense Footnotes [Text Block] Expenses Deferred Charges [Text Block] Expenses Range of Exchange Fees [Text Block] Expense Example [Heading] Expense Example by Year [Heading] Expense Example Narrative [Text Block] Expense Example by, Year, Caption [Text] Expense Example, With Redemption [Table] Expense Example, No Redemption Narrative [Text Block] Expense Example, No Redemption, By Year, Caption [Text] Expense Example, No Redemption [Table] Expense Example Footnotes [Text Block] Expense Example Closing [Text Block] Portfolio Turnover [Heading] Portfolio Turnover [Text Block] Strategy [Heading] Strategy Narrative [Text Block] Risk [Heading] Risk Narrative [Text Block] Risk Footnotes [Text Block] Risk Closing [Text Block] Bar Chart and Performance Table [Heading] Performance Narrative [Text Block] Bar Chart [Heading] Bar Chart Narrative [Text Block] Bar Chart [Table] Bar Chart Footnotes [Text Block] Bar Chart Closing [Text Block] Performance Table Heading Performance Table Narrative Performance [Table] Market Index Performance [Table] Performance Table Footnotes Performance Table Closing [Text Block] Shareholder Fees: Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) Maximum Deferred Sales Charge (as a percentage of Offering Price) Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower) Maximum Deferred Sales Charge (as a percentage) Exchange Fee Exchange Fee (as a percentage of Amount Redeemed) Shareholder Fees Column [Text] Maximum Cumulative Sales Charge (as a percentage of Offering Price) Maximum Cumulative Sales Charge (as a percentage) Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) Redemption Fee (as a percentage of Amount Redeemed) Redemption Fee (as a percentage of Amount Redeemed) Redemption Fee Redemption Fee Exchange Fee Maximum Account Fee (as a percentage of Assets) Maximum Account Fee Shareholder Fee, Other Operating Expenses: Management Fees Management Fees (as a percentage of Assets) Distribution and/or Service (12b-1) Fees Distribution and Service (12b-1) Fees Other Expenses: Transfer Agent Component1 Other Expenses Other Expenses Component2 Other Expenses Total Other Expenses Other Expenses (as a percentage of Assets): Total Other Expenses Acquired Fund Fees and Expenses (Underlying Portfolios) Acquired Fund Fees and Expenses Total Annual Strategy Operating Expenses Expenses (as a percentage of Assets) Total Annual Strategy Operating Expenses Operating Expenses Column [Text] Distribution or Similar (Non 12b-1) Fees Component3 Other Expenses Fee Waiver and/or Expense Reimbursement Fee Waiver and/or Expense Reimbursement Fee Waiver or Reimbursement Net Expenses (as a percentage of Assets) Total Annual Strategy Operating Expenses After Fee Waiver and/or Expense Reimbursement Total Annual Strategy Operating Expenses After Fee Waiver and/or Expense Reimbursement Expense Example: After 1 Year Expense Example, with Redemption, 1 Year After 3 Years Expense Example, with Redemption, 3 Years After 5 Years Expense Example, with Redemption, 5 Years After 10 Years Expense Example, with Redemption, 10 Years Expense Example, By Year, Column [Text] Column Expense Example, No Redemption: After 1 Year Expense Example, No Redemption, 1 Year After 3 Years Expense Example, No Redemption, 3 Years After 5 Years Expense Example, No Redemption, 5 Years After 10 Years Expense Example, No Redemption, 10 Years Column Expense Example, No Redemption, By Year, Column [Text] Bar Chart Table: Annual Return 2002 2002 Caption Annual Return Caption [Text] Column Annual Return, Column [Text] Annual Return, Inception Date Inception Date Annual Return 1990 Annual Return 1991 Annual Return 1992 Annual Return 1993 Annual Return 1994 Annual Return 1995 Annual Return 1996 Annual Return 1997 Annual Return 1998 Annual Return 1999 Annual Return 2000 Annual Return 2001 Annual Return 2003 2003 2004 Annual Return 2004 2005 Annual Return 2005 2006 Annual Return 2006 Annual Return 2007 2007 2008 Annual Return 2008 Annual Return 2009 2009 Annual Return 2010 2010 2011 Annual Return 2011 Annual Return 2012 Annual Return 2013 Annual Return 2014 Annual Return 2015 Annual Return 2016 Annual Return 2017 Annual Return 2018 Annual Return 2019 Annual Return 2020 S&P 500 Index. S And P Five Hundred [Member] S&P 500 Index (reflects no deduction for fees, expenses, or taxes) MSCI ACWI ex US Index Msci Acwi Ex Us Index [Member] MSCI ACWI ex US Index (reflects no deduction for fees, expenses, or taxes) MSCI ACWI Ex US Index (reflects no deduction for fees, expenses, or taxes) Sixty S And P Five Hundred Fourty Msci Acwi Ex Us Index [Member] 60% S&P 500 Index/40% MSCI ACWI ex US Index (reflects no deduction for fees, expenses, or taxes) 60% S&P 500 Index/40% MSCI ACWI ex US Index (reflects no deduction for fees, expenses, or taxes) Average Annual Return: 1 YEAR 1 Year 5 YEARS 5 Years SINCE INCEPTION Since Inception INCEPTION DATE Inception Date Label 10 Years 10 YEARS Risk/Return Detail [Table] Fee Waiver or Reimbursement over Assets, Date of Termination Portfolio Turnover, Rate Expense Breakpoint Discounts [Text] Expense Breakpoint, Minimum Investment Required [Amount] Expense Exchange Traded Fund Commissions [Text] Expenses Represent Both Master and Feeder [Text] Expenses Explanation of Nonrecurring Account Fee [Text] Other Expenses, New Fund, Based on Estimates [Text] Acquired Fund Fees and Expenses, Based on Estimates [Text] Expenses Other Expenses Had Extraordinary Expenses Been Included [Text] Expenses Restated to Reflect Current [Text] Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] Strategy Portfolio Concentration [Text] Risk Lose Money [Text] Risk Nondiversified Status [Text] Risk Money Market Fund [Text] Risk Not Insured Depository Institution [Text] Risk Caption Risk Column [Text] Risk [Text] Performance Information Illustrates Variability of Returns [Text] Performance One Year or Less [Text] Performance Additional Market Index [Text] Performance Availability Phone [Text] Performance Availability Website Address [Text] Performance Past Does Not Indicate Future [Text] Bar Chart Does Not Reflect Sales Loads [Text] Bar Chart, Reason Selected Class Different from Immediately Preceding Period [Text] Bar Chart, Returns for Class Not Offered in Prospectus [Text] Year to Date Return, Label Bar Chart, Year to Date Return, Date Bar Chart, Year to Date Return Highest Quarterly Return, Label Label Highest Quarterly Return, Date Highest Quarterly Return Label Lowest Quarterly Return, Label Lowest Quarterly Return, Date Lowest Quarterly Return Performance Table Does Reflect Sales Loads Performance Table Market Index Changed Index No Deduction for Fees, Expenses, Taxes [Text] Performance Table Uses Highest Federal Rate Performance Table Not Relevant to Tax Deferred Performance Table One Class of after Tax Shown [Text] Performance Table Explanation after Tax Higher Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text] Caption Column Money Market Seven Day Yield, Caption [Text] Money Market Seven Day Yield Column [Text] Money Market Seven Day Yield Phone Money Market Seven Day Yield Money Market Seven Day Tax Equivalent Yield Thirty Day Yield Caption Thirty Day Yield Column [Text] Thirty Day Yield Phone Thirty Day Yield Thirty Day Tax Equivalent Yield AllianceBernstein Balanced Wealth Strategy AllianceBernstein Balanced Wealth Strategy Member S000010512 [Member] ADVISOR CLASS SHARES Advisor Class,AllianceBernstein Balanced Wealth Strategy Member C000029018 [Member] ADVISOR CLASS Class A,AllianceBernstein Balanced Wealth Strategy Member C000029015 [Member] CLASS A SHARES CLASS A C000029016 [Member] Class B,AllianceBernstein Balanced Wealth Strategy Member CLASS B SHARES CLASS B CLASS C Class C,AllianceBernstein Balanced Wealth Strategy Member CLASS C SHARES C000029017 [Member] CLASS I CLASS I SHARES Class I,AllianceBernstein Balanced Wealth Strategy Member C000029021 [Member] Class K,AllianceBernstein Balanced Wealth Strategy Member C000029020 [Member] CLASS K CLASS K SHARES CLASS R C000029019 [Member] CLASS R SHARES Class R,AllianceBernstein Balanced Wealth Strategy Member Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) Barclays Capital Us Aggregate Bond Index [Member] 65% S&P 500 Index/35% Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) 65% S&P 500 Index/35% Barclays Capital U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) Sixty Five S And P Five Hundred Index Thirty Five Barclays Capital Us Aggregate Bond Index [Member] S000010510 [Member] AllianceBernstein Conservative Wealth Strategy AllianceBernstein Conservative Wealth Strategy Member ADVISOR CLASS Advisor Class,AllianceBernstein Conservative Wealth Strategy Member C000029007 [Member] ADVISOR CLASS SHARES C000029004 [Member] Class A,AllianceBernstein Conservative Wealth Strategy Member CLASS A CLASS A SHARES CLASS B SHARES Class B,AllianceBernstein Conservative Wealth Strategy Member C000029005 [Member] CLASS B C000029006 [Member] CLASS C SHARES Class C,AllianceBernstein Conservative Wealth Strategy Member CLASS C C000029010 [Member] Class I,AllianceBernstein Conservative Wealth Strategy Member CLASS I SHARES CLASS I CLASS K SHARES C000029009 [Member] CLASS K Class K,AllianceBernstein Conservative Wealth Strategy Member C000029008 [Member] Class R,AllianceBernstein Conservative Wealth Strategy Member CLASS R SHARES CLASS R 65% Barclays Capital U.S. Aggregate Bond Index/35% S&P 500 Index. Sixty Five Barclays Capital Us Aggregate Bond Index [Member] 65% Barclays Capital U.S. Aggregate Bond Index/35% S&P 500 Index (reflects no deduction for fees, expenses, or taxes) S000010515 [Member] AllianceBernstein Tax-Managed Wealth Appreciation Strategy AllianceBernstein Tax-Managed Wealth Appreciation Strategy Member Advisor Class,AllianceBernstein Tax-Managed Wealth Appreciation Strategy Member ADVISOR CLASS C000029036 [Member] ADVISOR CLASS SHARES Class A,AllianceBernstein Tax-Managed Wealth Appreciation Strategy Member C000029033 [Member] CLASS A SHARES CLASS A C000029034 [Member] CLASS B Class B,AllianceBernstein Tax-Managed Wealth Appreciation Strategy Member CLASS B SHARES CLASS C Class C,AllianceBernstein Tax-Managed Wealth Appreciation Strategy Member CLASS C SHARES C000029035 [Member] 60% S&P 500 Index/40% MSCI ACWI Ex US Index (reflects no deduction for fees, expenses, or taxes) 60% S&P 500 Index/40% MSCI ACWI Ex US Index (reflects no deduction for fees, expenses, or taxes). Sixty S And P Five Hundred Index Fourty Msci Ex Us Index [Member] S000010513 [Member] AllianceBernstein Tax-Managed Balanced Wealth Strategy Member AllianceBernstein Tax-Managed Balanced Wealth Strategy Advisor Class,AllianceBernstein Tax-Managed Balanced Wealth Strategy Member C000029025 [Member] ADVISOR CLASS ADVISOR CLASS SHARES CLASS A SHARES Class A,AllianceBernstein Tax-Managed Balanced Wealth Strategy Member CLASS A C000029022 [Member] CLASS B SHARES C000029023 [Member] Class B,AllianceBernstein Tax-Managed Balanced Wealth Strategy Member CLASS B CLASS C SHARES CLASS C Class C,AllianceBernstein Tax-Managed Balanced Wealth Strategy Member C000029024 [Member] Barclays Capital 5-yr Gen'l Obl. Muni Bond Index (reflects no deduction for fees, expenses, or taxes) Barclays Capital Five Year Genl Obl Muni Bond [Member] Barclays Capital 5-yr Gen'l Obl. Muni Bond Index 50% Barclays Capital 5-yr Gen'l Obl. Muni Bond Index/50% S&P 500 Index 50% Barclays Capital 5-yr Gen'l Obl. Muni Bond Index/50% S&P 500 Index (reflects no deduction for fees, expenses, or taxes) Fifty Barclays Capital Five Year Mni Bond [Member] AllianceBernstein Tax-Managed Conservative Wealth Strategy S000010511 [Member] AllianceBernstein Tax-Managed Conservative Wealth Strategy Member Advisor Class,AllianceBernstein Tax-Managed Conservative Wealth Strategy Member ADVISOR CLASS C000029014 [Member] ADVISOR CLASS SHARES CLASS A SHARES CLASS A C000029011 [Member] Class A,AllianceBernstein Tax-Managed Conservative Wealth Strategy Member CLASS B SHARES C000029012 [Member] CLASS B Class B,AllianceBernstein Tax-Managed Conservative Wealth Strategy Member CLASS C SHARES C000029013 [Member] CLASS C Class C,AllianceBernstein Tax-Managed Conservative Wealth Strategy Member Seventy Barclays Capital Five Year Muni Bond Index [Member] 70% Barclays Capital 5-yr Gen'l Obl. Muni Bond Index/30% S&P 500 Index (reflects no deduction for fees, expenses, or taxes) 70% Barclays Capital 5-yr Gen'l Obl. Muni Bond Index/30% S&P 500 Index (reflects no deduction for fees, expenses, or taxes)