Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	AB VARIABLE PRODUCTS SERIES FUND, INC.
Prospectus Date	rr_ProspectusDate	May 01, 2015
Class B Shares | AB Small/Mid Cap Value Portfolio
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	AB VPS SMALL/MID CAP VALUE PORTFOLIO
Objective [Heading]	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Portfolio's investment objective is long-term growth of capital.
Expense [Heading]	rr_ExpenseHeading	FEES AND EXPENSES OF THE PORTFOLIO
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Portfolio. The operating expenses information below is designed to assist Contractholders of variable products that invest in the Portfolio in understanding the fees and expenses that they may pay as an investor. Because the information does not reflect deductions at the separate account level or contract level for any charges that may be incurred under a contract, Contractholders that invest in the Portfolio should refer to the variable contract prospectus for a description of fees and expenses that apply to Contractholders. Inclusion of these charges would increase the fees and expenses provided below.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	ANNUAL PORTFOLIO OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	PORTFOLIO TURNOVER
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio's performance. During the most recent fiscal year, the Portfolio's portfolio turnover rate was 45% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	45.00%
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 Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year and that the Portfolio'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 Portfolio invests primarily in a diversified portfolio of equity securities of small- to mid-capitalization U.S. companies. Under normal circumstances, the Portfolio invests at least 80% of its net assets in securities of small- to mid-capitalization companies. For purposes of this policy, small- to mid-capitalization companies are those that, at the time of investment, fall within the capitalization range between the smallest company in the Russell 2500(R) Value Index and the greater of $5 billion or the market capitalization of the largest company in the Russell 2500(R) Value Index. Because the Portfolio's definition of small- to mid-capitalization companies is dynamic, the lower and upper limits on market capitalization will change with the markets. As of December 31, 2014, there were approximately 1,752 small- to mid-capitalization companies, representing a market capitalization range from approximately $19.0 million to approximately $11.8 billion. The Portfolio invests in companies that are determined by the Adviser to be undervalued, using the Adviser's fundamental value approach. In selecting securities for the Portfolio's portfolio, the Adviser uses its fundamental and quantitative research to identify companies whose long-term earnings power is not reflected in the current market price of their securities. In selecting securities for the Portfolio's portfolio, the Adviser looks for companies with attractive valuation (for example, with low price to book ratios) and compelling success factors (for example, momentum and return on equity). The Adviser then uses this information to calculate an expected return. Returns and rankings are updated on a daily basis. The rankings are used to determine prospective candidates for further fundamental research and, subsequently, possible addition to the portfolio. Typically, the Adviser's fundamental research analysts focus their research on the most attractive 20% of the universe. The Adviser typically projects a company's financial performance over a full economic cycle, including a trough and a peak, within the context of forecasts for real economic growth, inflation and interest rate changes. The Adviser focuses on the valuation implied by the current price, relative to the earnings the company will be generating five years from now, or "normalized" earnings, assuming average mid-economic cycle growth for the fifth year. The Portfolio's management team and other senior investment professionals work in close collaboration to weigh each investment opportunity identified by the research staff relative to the entire portfolio and determine the timing and position size for purchases and sales. Analysts remain responsible for monitoring new developments that would affect the securities they cover. The team will generally sell a security when it no longer meets appropriate valuation criteria, although sales may be delayed when positive return trends are favorable. Typically, growth in the size of a company's market capitalization relative to other domestically traded companies will not cause the Portfolio to dispose of the security. The Adviser seeks to manage overall portfolio volatility relative to the universe of companies that comprise the lowest 20% of the total U.S. market capitalization by favoring promising securities that offer the best balance between return and targeted risk. At times, the Portfolio may favor or disfavor a particular sector compared to that universe of companies. The Portfolio may invest significantly in companies involved in certain sectors that constitute a material portion of the universe of small- and mid-capitalization companies, such as financial services and consumer services. The Portfolio may enter into derivatives transactions, such as options, futures contracts, forwards and swaps. The Portfolio may use options strategies involving the purchase and/or writing of various combinations of call and/or put options, including on individual securities and stock indices, futures contracts (including futures contracts on individual securities and stock indices) or shares of exchange-traded funds, or ETFs. These transactions may be used, for example, to earn extra income, to adjust exposure to individual securities or markets, or to protect all or a portion of the Portfolio's portfolio from a decline in value, sometimes within certain ranges. The Portfolio may invest in securities issued by non-U.S. companies. The Portfolio may, at times, invest in shares of ETFs in lieu of making direct investments in equity securities. ETFs may provide more efficient and economical exposure to the types of companies and geographic locations in which the Portfolio seeks to invest than direct investments.
Risk [Heading]	rr_RiskHeading	PRINCIPAL RISKS
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	MARKET RISK: The value of the Portfolio's assets will fluctuate as the stock or bond market fluctuates. The value of its investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. It includes the risk that a particular style of investing, such as value, may underperform the market generally. CAPITALIZATION RISK: Investments in small- and mid-capitalization companies may be more volatile than investments in large-capitalization companies. Investments in small-capitalization companies may have additional risks because these companies have limited product lines, markets or financial resources. 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. CURRENCY RISK: Fluctuations in currency exchange rates may negatively affect the value of the Portfolio's investments or reduce its returns. DERIVATIVES RISK: Derivatives may be illiquid, difficult to price, and leveraged so that small changes may produce disproportionate losses for the Portfolio, and may be subject to counterparty risk to a greater degree than more traditional investments. MANAGEMENT RISK: The Portfolio is subject to management risk because it is an actively-managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions for the Portfolio, but there is no guarantee that its techniques will produce the intended results. As with all investments, you may lose money by investing in the Portfolio.
Risk Lose Money [Text]	rr_RiskLoseMoney	As with all investments, you may lose money by investing in the Portfolio.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	BAR CHART AND PERFORMANCE INFORMATION
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing: how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index. The performance information does not take into account separate account charges. If separate account charges were included, an investor's return would be lower. The Portfolio's past performance, of course, does not necessarily indicate how it will perform in the future.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	how the Portfolio's performance changed from year to year over ten years; and how the Portfolio's average annual returns for one, five and ten years compare to those of a broad-based securities market index.
Performance Additional Market Index [Text]	rr_PerformanceAdditionalMarketIndex	The performance table includes an additional index that shows how the Portfolio's performance compares with an index of securities similar to those in which the Portfolio invests.
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Portfolio's past performance, of course, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	BAR CHART
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The performance information does not take into account separate account charges. If separate account charges were included, an investor's return would be lower.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Calendar Year End (%) During the period shown in the bar chart, the Portfolio's: BEST QUARTER WAS UP 24.73%, 3RD QUARTER, 2009; AND WORST QUARTER WAS DOWN -27.00%, 4TH QUARTER, 2008.
Performance Table Heading	rr_PerformanceTableHeading	PERFORMANCE TABLE AVERAGE ANNUAL TOTAL RETURNS (For the periods ended December 31, 2014)
Class B Shares | AB Small/Mid Cap Value Portfolio | Class B
Risk/Return:	rr_RiskReturnAbstract
SHAREHOLDER FEES (fees paid directly from your investment)	rr_ShareholderFeeOther
Management Fees	rr_ManagementFeesOverAssets	0.75%
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.07%
Total Portfolio Operating Expenses	rr_ExpensesOverAssets	1.07%
After 1 Year	rr_ExpenseExampleYear01	109
After 3 Years	rr_ExpenseExampleYear03	340
After 5 Years	rr_ExpenseExampleYear05	590
After 10 Years	rr_ExpenseExampleYear10	1,306
2005	rr_AnnualReturn2005	6.63%
2006	rr_AnnualReturn2006	14.20%
2007	rr_AnnualReturn2007	1.53%
2008	rr_AnnualReturn2008	(35.75%)
2009	rr_AnnualReturn2009	42.66%
2010	rr_AnnualReturn2010	26.59%
2011	rr_AnnualReturn2011	(8.62%)
2012	rr_AnnualReturn2012	18.47%
2013	rr_AnnualReturn2013	37.63%
2014	rr_AnnualReturn2014	8.95%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	BEST QUARTER
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	24.73%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	WORST QUARTER
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(27.00%)
1 YEAR	rr_AverageAnnualReturnYear01	8.95%
5 YEARS	rr_AverageAnnualReturnYear05	15.49%
10 YEARS	rr_AverageAnnualReturnYear10	8.82%
Class B Shares | AB Small/Mid Cap Value Portfolio | Russell 2500(R) Value Index (reflects no deduction for fees, expenses, or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	7.11%
5 YEARS	rr_AverageAnnualReturnYear05	15.48%
10 YEARS	rr_AverageAnnualReturnYear10	7.91%
Class B Shares | AB Small/Mid Cap Value Portfolio | Russell 2500(R) Index (reflects no deduction for fees, expenses, or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 YEAR	rr_AverageAnnualReturnYear01	7.07%	[1]
5 YEARS	rr_AverageAnnualReturnYear05	16.36%	[1]
10 YEARS	rr_AverageAnnualReturnYear10	8.72%	[1]

[1] The performance table includes an additional index that shows how the Portfolio's performance compares with an index of securities similar to those in which the Portfolio invests.