Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	May 01, 2012
High-Income Bond Fund (Second Prospectus Summary) | High-Income Bond Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return, Heading	rr_RiskReturnHeading	HIGH-INCOME BOND FUND(SM)
Investment Objective, Heading	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
investment Objective, Primary	rr_ObjectivePrimaryTextBlock	The fund's primary investment objective is to provide you with a high level of current income.
Investment Objective, Secondary	rr_ObjectiveSecondaryTextBlock	Its secondary investment objective is capital appreciation.
Expense, Heading	rr_ExpenseHeading	FEES AND EXPENSES OF THE FUND
Expense, Narrative	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold an interest in Class 2 shares of the fund. It does not reflect insurance contract fees and expenses. If insurance contract fees and expenses were reflected, expenses shown would be higher.
Operating Expenses, Caption	rr_OperatingExpensesCaption	ANNUAL FUND 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	rr_PortfolioTurnoverTextBlock	The fund pays transaction costs, such as commissions, when it buys and 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 costs, which are not reflected in annual fund operating expenses or in the example, affect the fund's investment results. During the most recent fiscal year, the fund's portfolio turnover rate was 51% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	51.00%
Expense Example, Heading	rr_ExpenseExampleHeading	EXAMPLE
Expense Example, Narrative	rr_ExpenseExampleNarrativeTextBlock	The example below is intended to help you compare the cost of investing in Class 2 shares of the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem your shares at the end of the periods. The example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same. The example does not reflect insurance contract expenses. If insurance contract expenses were reflected, expenses shown would be higher.
Expense Example, By Year, Caption	rr_ExpenseExampleByYearCaption	Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Investment Strategy, Heading	rr_StrategyHeading	PRINCIPAL INVESTMENT STRATEGIES
Investment Strategy, Narrative	rr_StrategyNarrativeTextBlock	The fund invests primarily in higher yielding and generally lower quality debt securities (rated Ba1 or below or BB+ or below by Nationally Recognized Statistical Rating Organizations designated by the fund's investment adviser or unrated but determined by the fund's investment adviser to be of equivalent quality), including corporate loan obligations. Such securities are sometimes referred to as "junk bonds." The fund may invest a portion of its assets in securities of issuers domiciled outside the United States.    The fund is designed for investors seeking a high level of current income and who are able to tolerate greater credit risk and price fluctuations than those that exist in funds investing in higher quality debt securities. The investment adviser uses a system of multiple portfolio counselors in managing the fund's assets. Under this approach, the portfolio of the fund is divided into segments managed by individual counselors who decide how their respective segments will be invested. The fund relies on the professional judgment of its investment adviser to make decisions about the fund's portfolio investments. The basic investment philosophy of the investment adviser is to seek to invest in attractively valued securities that, in its opinion, represent good, long-term investment opportunities. The investment adviser believes that an important way to accomplish this is through fundamental analysis, which may include meeting with company executives and employees, suppliers, customers and competitors. Securities may be sold when the investment adviser believes that they no longer represent relatively attractive investment opportunities.
Risk, Heading	rr_RiskHeading	PRINCIPAL RISKS
Risk, Narrative	rr_RiskNarrativeTextBlock	THIS SECTION DESCRIBES THE PRINCIPAL RISKS ASSOCIATED WITH THE FUND'S PRINCIPAL INVESTMENT STRATEGIES. YOU MAY LOSE MONEY BY INVESTING IN THE FUND. THE LIKELIHOOD OF LOSS MAY BE GREATER IF YOU INVEST FOR A SHORTER PERIOD OF TIME.    INVESTING IN LOWER RATED BONDS -- Lower rated bonds and other lower rated debt securities generally have higher rates of interest and involve greater risk of default or price declines due to changes in the issuer's creditworthiness than those of higher quality debt securities. The market prices of these securities may fluctuate more than the prices of higher quality debt securities and may decline significantly in periods of general economic difficulty. These risks may be increased with respect to investments in junk bonds.    THINLY TRADED SECURITIES -- There may be little trading in the secondary market for particular bonds or other debt securities, which may make them more difficult to value, acquire or sell. INVESTING IN BONDS -- Rising interest rates will generally cause the prices of bonds and other debt securities to fall. Longer maturity debt securities may be subject to greater price fluctuations than shorter maturity debt securities. In addition, falling interest rates may cause an issuer to redeem, call or refinance a security before its stated maturity, which may result in the fund having to reinvest the proceeds in lower yielding securities.    Bonds and other debt securities are subject to credit risk, which is the possibility that the credit strength of an issuer will weaken and/or an issuer of a debt security will fail to make timely payments of principal or interest and the security will go into default. MARKET CONDITIONS -- The prices of, and income generated by, the bonds and other securities held by the fund may decline due to market conditions and other factors, including those directly involving the issuers of securities held by the fund. INVESTING OUTSIDE THE UNITED STATES -- Securities of issuers domiciled outside the United States, or with significant operations outside the United States, may lose value because of political, social, economic or market developments or instability in the countries or regions in which the issuer operates. These securities may also lose value due to changes in foreign currency exchange rates against the U.S. dollar and/or currencies of other countries. Securities markets in certain countries may be more volatile and/or less liquid than those in the United States. Investments outside the United States may also be subject to different settlement and accounting practices and different regulatory, legal and reporting standards, and may be more difficult to value, than those in the United States. MANAGEMENT -- The investment adviser to the fund actively manages the fund's investments. Consequently, the fund is subject to the risk that the methods and analyses employed by the investment adviser in this process may not produce the desired results. This could cause the fund to lose value or its investment results to lag relevant benchmarks or other funds with similar objectives.    Your investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.
Risk, Lose Money	rr_RiskLoseMoney	YOU MAY LOSE MONEY BY INVESTING IN THE FUND.
Risk, Not Insured Depository Institution	rr_RiskNotInsuredDepositoryInstitution	Your investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.
Bar Chart and Performance Table, Heading	rr_BarChartAndPerformanceTableHeading	INVESTMENT RESULTS
Performance, Narrative	rr_PerformanceNarrativeTextBlock	The following information shows how the investment results of the Class 2 shares of the fund have varied from year to year and how the fund's average annual total returns for various periods compare with different broad measures of market performance. This information provides some indication of the risks of investing in the fund. The Lipper High Current Yield Funds Index includes mutual funds that disclose investment objectives and/or strategies reasonably comparable to those of the fund. Past results are not predictive of future results. Figures shown reflect fees and expenses associated with an investment in the fund, but do not reflect insurance contract fees and expenses. If insurance contract fees and expenses were included, results would have been lower.
Performance, Information Illustrates Variability of Returns	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following information shows how the investment results of the Class 2 shares of the fund have varied from year to year and how the fund's average annual total returns for various periods compare with different broad measures of market performance.
Performance, Additional Market Index	rr_PerformanceAdditionalMarketIndex	The Lipper High Current Yield Funds Index includes mutual funds that disclose investment objectives and/or strategies reasonably comparable to those of the fund.
Performance, Past Does Not Indicate Future	rr_PerformancePastDoesNotIndicateFuture	Past results are not predictive of future results.
Bar Chart, Heading	rr_BarChartHeading	Calendar year total returns.
Bar Chart, Narrative	rr_BarChartNarrativeTextBlock	The following information shows how the investment results of the Class 2 shares of the fund have varied from year to year and how the fund's average annual total returns for various periods compare with different broad measures of market performance.
Bar Chart, Closing	rr_BarChartClosingTextBlock	The fund's highest/lowest quarterly results during this time period were: HIGHEST   16.18% (quarter ended June 30, 2009) LOWEST   -16.05% (quarter ended December 31, 2008)
Average Annual Returns, Caption	rr_AverageAnnualReturnCaption	For periods ended December 31, 2011: AVERAGE ANNUAL TOTAL RETURNS
High-Income Bond Fund (Second Prospectus Summary) | High-Income Bond Fund | Barclays Capital U.S. Corporate High Yield 2% Issuer Capped Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Barclays Capital U.S. Corporate High Yield 2% Issuer Capped Index (reflects no deduction for sales charges, account fees, expenses or taxes)
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	4.96%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	7.74%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	8.96%
High-Income Bond Fund (Second Prospectus Summary) | High-Income Bond Fund | Lipper High Current Yield Funds Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Lipper High Current Yield Funds Index (reflects no deduction for sales charges, account fees or taxes)
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	2.85%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	5.13%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	7.08%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	7.57%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 08, 1984	[1]
High-Income Bond Fund (Second Prospectus Summary) | High-Income Bond Fund | Class 2
Risk Return [Abstract]	rr_RiskReturnAbstract
Management fee	rr_ManagementFeesOverAssets	0.46%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.72%
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	74
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	230
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	401
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	894
Annual Return 2002	rr_AnnualReturn2002	(1.83%)
Annual Return 2003	rr_AnnualReturn2003	29.51%
Annual Return 2004	rr_AnnualReturn2004	9.59%
Annual Return 2005	rr_AnnualReturn2005	2.20%
Annual Return 2006	rr_AnnualReturn2006	10.59%
Annual Return 2007	rr_AnnualReturn2007	1.33%
Annual Return 2008	rr_AnnualReturn2008	(23.84%)
Annual Return 2009	rr_AnnualReturn2009	38.94%
Annual Return 2010	rr_AnnualReturn2010	15.07%
Annual Return 2011	rr_AnnualReturn2011	1.92%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	HIGHEST
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	16.18%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	LOWEST
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(16.05%)
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	HIGH-INCOME BOND FUND
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	1.92%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	4.69%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	7.07%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	9.09%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 08, 1984	[1]

[1] Lifetime results are from February 8, 1984, the date the fund began investment operations. Class 2 shares were first offered on April 30, 1997; therefore, lifetime results for the fund prior to that date assume a hypothetical investment in Class 1 shares, reduced by the .25% annual expense that applies to Class 2 shares and is described in the "Plans of distribution" section of this prospectus. Results for Class 1 shares are comparable to those of Class 2 shares because both classes invest in the same portfolio of securities.