Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	May 01, 2012
Cash Management Fund (First Prospectus Summary) | Cash Management Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return, Heading	rr_RiskReturnHeading	CASH MANAGEMENT FUND(SM)
Investment Objective, Heading	rr_ObjectiveHeading	INVESTMENT OBJECTIVE
investment Objective, Primary	rr_ObjectivePrimaryTextBlock	The investment objective of the fund is to provide you with a way to earn income on your cash reserves while preserving capital and maintaining liquidity.
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 1 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)
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 1 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	Normally, the fund invests substantially in high-quality money market instruments such as commercial paper, commercial bank obligations, U.S. or Canadian government securities, and short-term corporate bonds and notes. These securities may have credit and liquidity support features, including guarantees. The fund may invest in securities issued by entities domiciled outside the United States and securities with credit and liquidity support features provided by entities domiciled outside of the United States. The fund may also invest in securities of U.S. issuers with substantial operations outside the United States. 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 provide current income while preserving capital and maintaining liquidity. The investment adviser believes that an important way to accomplish this is by analyzing various factors, including the credit strength of the issuer, prices of similar securities issued by comparable issuers, current and anticipated changes in interest rates, general market conditions and other factors pertinent to the particular security being evaluated.
Risk, Heading	rr_RiskHeading	PRINCIPAL RISKS
Risk, Narrative	rr_RiskNarrativeTextBlock	THIS SECTION DESCRIBES THE PRINCIPAL RISKS ASSOCIATED WITH THE FUND'S PRINCIPAL INVESTMENT STRATEGIES. THE FUND IS NOT MANAGED TO MAINTAIN A STABLE ASSET VALUE OF $1.00 PER SHARE AND IT IS POSSIBLE TO LOSE MONEY BY INVESTING IN THE FUND.    INVESTING IN MONEY MARKET SECURITIES -- The values and liquidity of the securities held by the fund may be affected by changing interest rates, changes in the credit quality of the issuers, changes in credit ratings of the securities and general market conditions. For example, the values of these securities may decline when interest rates rise and increase when interest rates fall. LOW INTEREST RATE ENVIRONMENT -- During periods of extremely low short-term interest rates, the fund may not be able to maintain a positive yield.    CREDIT AND LIQUIDITY SUPPORT -- Changes in the credit quality of banks and financial institutions providing credit and liquidity support features with respect to securities held by the fund could cause the values of these securities to decline. 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 or economic developments in the country or region in which the issuer operates. 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.    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	THE FUND IS NOT MANAGED TO MAINTAIN A STABLE ASSET VALUE OF $1.00 PER SHARE AND IT IS POSSIBLE TO 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 1 shares of the fund have varied from year to year, and the fund's average annual total returns for various periods. This information provides some indication of the risks of investing in 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 1 shares of the fund have varied from year to year, and the fund's average annual total returns for various periods.
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 1 shares of the fund have varied from year to year, and the fund's average annual total returns for various periods.
Bar Chart, Closing	rr_BarChartClosingTextBlock	The fund's highest/lowest quarterly results during this time period were:    HIGHEST   1.31% (quarter ended December 31, 2006) LOWEST   -0.09% (quarter ended September 30, 2011)
Average Annual Returns, Caption	rr_AverageAnnualReturnCaption	For periods ended December 31, 2011: AVERAGE ANNUAL TOTAL RETURNS
Cash Management Fund (First Prospectus Summary) | Cash Management Fund | Class 1
Risk Return [Abstract]	rr_RiskReturnAbstract
Management fee	rr_ManagementFeesOverAssets	0.32%
Other expenses	rr_OtherExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.33%
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	34
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	106
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	185
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	418
Annual Return 2002	rr_AnnualReturn2002	1.24%
Annual Return 2003	rr_AnnualReturn2003	0.67%
Annual Return 2004	rr_AnnualReturn2004	0.96%
Annual Return 2005	rr_AnnualReturn2005	2.97%
Annual Return 2006	rr_AnnualReturn2006	4.81%
Annual Return 2007	rr_AnnualReturn2007	4.95%
Annual Return 2008	rr_AnnualReturn2008	2.15%
Annual Return 2009	rr_AnnualReturn2009	(0.10%)
Annual Return 2010	rr_AnnualReturn2010	(0.09%)
Annual Return 2011	rr_AnnualReturn2011	(0.26%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	HIGHEST
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2006
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	1.31%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	LOWEST
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(0.09%)
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	CASH MANAGEMENT FUND
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	(0.26%)
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.31%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	1.71%
Average Annual Returns, Since Inception	rr_AverageAnnualReturnSinceInception	4.26%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 08, 1984