Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Apr. 30, 2012
Money Market Account (Prospectus Summary) | Money Market Account
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return, Heading	rr_RiskReturnHeading	Money Market Account
Investment Objective, Heading	rr_ObjectiveHeading	Objective:
investment Objective, Primary	rr_ObjectivePrimaryTextBlock	The Account seeks as high a level of current income as is considered consistent with preservation of principal and maintenance of liquidity.
Expense, Heading	rr_ExpenseHeading	Fees and Expenses of the Account
Expense, Narrative	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Account. These fees and expenses do not reflect the fees and expenses of any variable insurance contract that may invest in the Account and would be higher if they did.
Operating Expenses, Caption	rr_OperatingExpensesCaption	Annual Account 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	This Example is intended to help you compare the cost of investing in the Account with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Account for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Account's operating expenses remain the same. If separate account expenses and contract level expenses were included, expenses would be higher. 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 Account seeks to maintain a stable net asset value of $1.00 per share by investing its assets in a portfolio of high quality, short-term money market instruments such as those issued by banks, corporations (U.S. and non-U.S.), municipalities and the U.S. government. Such instruments include certificates of deposit, bankers acceptances, commercial paper, treasury bills, bonds, and shares of other money market funds. The Account maintains a dollar weighted average portfolio maturity of 60 days or less. As with all mutual funds, the value of the Account's assets may rise or fall.
Risk, Heading	rr_RiskHeading	Principal Risks
Risk, Narrative	rr_RiskNarrativeTextBlock	The Account may be an appropriate investment for investors seeking monthly dividends without incurring much risk to principal. An investment in the Account is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the Account seeks to preserve the value of an investment at $1.00 per share, it is possible to lose money by investing in the Account. The principal risks of investing in the Account, in alphabetical order, are: Fixed-Income Securities Risk. Fixed-income securities are subject to interest rate risk and credit quality risk. The market value of fixed-income securities generally declines when interest rates rise, and an issuer of fixed-income securities could default on its payment obligations.    Foreign Securities Risk. The risks of foreign securities include loss of value as a result of: political or economic instability; nationalization, expropriation or confiscatory taxation; settlement delays; and limited government regulation (including less stringent reporting, accounting, and disclosure standards than are required of U.S. companies). Investment Company Securities Risk. Fund shareholders bear indirectly their proportionate share of the expenses of other investment companies in which the fund invests. U.S. Government Securities Risk. Yields available from U.S. government securities are generally lower than yields from many other fixed-income securities. U.S. Government Sponsored Securities Risk. Securities issued by U.S. government-sponsored or -chartered enterprises such as the Federal Home Loan Mortgage Corporation, the Federal National Mortgage Association, and the Federal Home Loan Banks are not issued or guaranteed by the U.S. Treasury.
Risk, Money Market Fund	rr_RiskMoneyMarketFund	Although the Account seeks to preserve the value of an investment at $1.00 per share, it is possible to lose money by investing in the Account.
Risk, Not Insured Depository Institution	rr_RiskNotInsuredDepositoryInstitution	An investment in the Account is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table, Heading	rr_BarChartAndPerformanceTableHeading	Performance
Performance, Narrative	rr_PerformanceNarrativeTextBlock	The following information provides some indication of the risks of investing in the Account by showing changes in the Account's performance from year to year and by showing how the Account's average annual returns for 1, 5, and 10 years (or, if shorter, the life of the Account) compare with those of one or more broad measures of market performance. Past performance is not necessarily an indication of how the Account will perform in the future. Performance figures for the Accounts do not include any separate account expenses, cost of insurance, or other contract-level expenses; total returns for the Accounts would be lower if such expenses were included. Performance of the Class 2 shares for periods prior to inception of the class reflects performance of the Class 1 shares, which have the same investments as Class 2 shares, but has been adjusted downward to reflect the higher expenses of Class 2 shares.
Performance, Information Illustrates Variability of Returns	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following information provides some indication of the risks of investing in the Account by showing changes in the Account's performance from year to year and by showing how the Account's average annual returns for 1, 5, and 10 years (or, if shorter, the life of the Account) compare with those of one or more broad measures of market performance.
Performance, Past Does Not Indicate Future	rr_PerformancePastDoesNotIndicateFuture	Past performance is not necessarily an indication of how the Account will perform in the future.
Bar Chart, Heading	rr_BarChartHeading	Calendar Year Total Returns (%) as of 12/31 each year (Class 1 Shares)
Bar Chart, Closing	rr_BarChartClosingTextBlock	Highest return for a quarter during the period of the bar               chart above:                                                    Q3 '07     1.24% Lowest return for a quarter during the period of the bar                chart above:                                                    Q4 '10     0.00%
Index No Deduction for Fees, Expenses, Taxes	rr_IndexNoDeductionForFeesExpensesTaxes	reflects no deduction for fees, expenses, or taxes
Average Annual Returns, Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns (%) For the periods ended December 31, 2011
Money Market Account (Prospectus Summary) | Money Market Account | Barclays Capital U.S. Treasury Bellwethers 3 Month Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Barclays Capital U.S. Treasury Bellwethers 3 Month Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	0.11%
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.55%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	1.99%
Money Market Account (Prospectus Summary) | Money Market Account | Class 1
Risk Return [Abstract]	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets
Other Expenses	rr_OtherExpensesOverAssets
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Account Operating Expenses	rr_ExpensesOverAssets	0.46%
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	47
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	148
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	258
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	579
Annual Return 2002	rr_AnnualReturn2002	1.42%
Annual Return 2003	rr_AnnualReturn2003	0.74%
Annual Return 2004	rr_AnnualReturn2004	0.92%
Annual Return 2005	rr_AnnualReturn2005	2.69%
Annual Return 2006	rr_AnnualReturn2006	4.67%
Annual Return 2007	rr_AnnualReturn2007	4.94%
Annual Return 2008	rr_AnnualReturn2008	2.58%
Annual Return 2009	rr_AnnualReturn2009	0.22%
Annual Return 2010	rr_AnnualReturn2010	0.00%
Annual Return 2011	rr_AnnualReturn2011	0.00%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Highest return for a quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2007
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	1.24%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Lowest return for a quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	0.00%
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Money Market Account - Class 1
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	none
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.53%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	1.80%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 18, 1983
Money Market Account (Prospectus Summary) | Money Market Account | Class 2
Risk Return [Abstract]	rr_RiskReturnAbstract
Management Fees	rr_ManagementFeesOverAssets	0.45%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets
Acquired Fund Fees and Expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total Annual Account Operating Expenses	rr_ExpensesOverAssets	0.71%
Expense Example, With Redemption, 1 Year	rr_ExpenseExampleYear01	73
Expense Example, With Redemption, 3 Years	rr_ExpenseExampleYear03	227
Expense Example, With Redemption, 5 Years	rr_ExpenseExampleYear05	395
Expense Example, With Redemption, 10 Years	rr_ExpenseExampleYear10	883
Average Annual Returns, Label	rr_AverageAnnualReturnLabel	Money Market Account - Class 2
Average Annual Returns, 1 Year	rr_AverageAnnualReturnYear01	none
Average Annual Returns, 5 Years	rr_AverageAnnualReturnYear05	1.42%
Average Annual Returns, 10 Years	rr_AverageAnnualReturnYear10	1.57%
Average Annual Returns, Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 08, 2007