000000 - Document - Document and Entity Information {Elements}
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000011 - Document - Risk/Return Summary {Unlabeled} - AllianceBernstein Small Cap Growth Portfolio
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000012 - Schedule - Shareholder Fees {- AllianceBernstein Small Cap Growth Portfolio}
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000013 - Schedule - Annual Fund Operating Expenses {- AllianceBernstein Small Cap Growth Portfolio}
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000014 - Schedule - Expense Example {- AllianceBernstein Small Cap Growth Portfolio}
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000015 - Schedule - Expense Example, No Redemption {- AllianceBernstein Small Cap Growth Portfolio}
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000016 - Schedule - Annual Total Returns - AllianceBernstein Small Cap Growth Portfolio [BarChart]
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000017 - Schedule - Average Annual Total Returns {Transposed} {- AllianceBernstein Small Cap Growth Portfolio}
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000018 - Document - Risk/Return Detail {Unlabeled} - AllianceBernstein Small Cap Growth Portfolio
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000019 - Disclosure - Risk/Return Detail Data {Elements} - AllianceBernstein Small Cap Growth Portfolio
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000021 - Document - Risk/Return Summary {Unlabeled} - AllianceBernstein International Discovery Equity Portfolio
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000022 - Schedule - Shareholder Fees {- AllianceBernstein International Discovery Equity Portfolio}
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000023 - Schedule - Annual Fund Operating Expenses {- AllianceBernstein International Discovery Equity Portfolio}
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000024 - Schedule - Expense Example {- AllianceBernstein International Discovery Equity Portfolio}
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000025 - Schedule - Expense Example, No Redemption {Transposed} {- AllianceBernstein International Discovery Equity Portfolio}
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000026 - Schedule - Annual Total Returns - AllianceBernstein International Discovery Equity Portfolio [BarChart]
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000027 - Schedule - Average Annual Total Returns {Transposed} {- AllianceBernstein International Discovery Equity Portfolio}
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000028 - Document - Risk/Return Detail {Unlabeled} - AllianceBernstein International Discovery Equity Portfolio
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000029 - Disclosure - Risk/Return Detail Data {Elements} - AllianceBernstein International Discovery Equity Portfolio
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