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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading MONEY MARKET PORTFOLIO
Objective [Heading] rr_ObjectiveHeading Investment Objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Portfolio seeks high current income, preservation of capital and liquidity.

Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Portfolio
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The table below describes the fees and expenses that you may pay if you buy and hold Class X shares of the Portfolio. Total Annual Portfolio Operating Expenses in the table and the Example below do not reflect the impact of any charges by your insurance company. If they did, expenses would be higher.

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)
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The example below is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds.


The example assumes that you invest $10,000 in the Portfolio, your investment has a 5% return each year, and the Portfolio's operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Portfolio seeks to maintain a stable net asset value ("NAV") of $1.00 per share by investing in high quality, short-term debt obligations. The Portfolio's money market investments may include commercial paper, corporate obligations, debt obligations of U.S. regulated banks (including U.S. branches and subsidiaries of foreign banks) and instruments secured by those obligations (these investments include certificates of deposit), certificates of deposit of savings banks and savings and loan organizations, debt obligations issued or guaranteed as to principal and interest by the U.S. Government, its agencies and instrumentalities, U.S. dollar-denominated foreign bank obligations, asset-backed securities and repurchase agreements. The Portfolio may also invest in municipal obligations.

Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

There is no assurance that the Portfolio will achieve its investment objectives. Although the Portfolio seeks to preserve the value of your investment at $1.00 per share, if it is unable to do so, it is possible to lose money by investing in the Portfolio. The principal risks of investing in the Portfolio include:


• Credit and Interest Rate. Credit risk refers to the possibility that the issuer or guarantor of a security will be unable to make interest payments and/or repay the principal on its debt. Interest rate risk refers to fluctuations in the value of a debt security resulting from changes in the general level of interest rates. The historically low interest rate environment increases the risk associated with rising interest rates. The Portfolio may face a heightened level of risk, especially since the Federal Reserve Board has ended its quantitative easing program and may begin to raise rates.


• U.S. Government Securities. The U.S. government securities in which the Portfolio invests can be subject to two types of risk: credit risk and interest rate risk. When the general level of interest rates goes up, the prices of most fixed-income securities go down. When the general level of interest rates goes down, the prices of most fixed-income securities go up. With respect to U.S. government securities that are not backed by the full faith and credit of the United States, there is the risk that the U.S. Government will not provide financial support to such U.S. government agencies, instrumentalities or sponsored enterprises if it is not obligated to do so by law.


•  Money Market Fund Regulation. The SEC recently adopted changes to the rules that govern money market funds. These changes have a phase-in period ranging from mid-2015 (primarily for certain new disclosure-related requirements) to the latter half of 2016 (for the most significant changes, such as the imposition of a floating NAV and the possible imposition of redemption fees and/or the temporary suspension of redemption privileges if a fund's portfolio liquidity falls below certain required minimum levels because of market conditions or other factors). While the industry is still assessing the impact of these rule changes, they may affect the investment strategies, performance, operating expenses and structure of money market funds.


• Asset-Backed Securities. Asset-backed securities involve the risk that various federal and state consumer laws and other legal and economic factors may result in the collateral backing the securities being insufficient to support payment on the securities. Some asset-backed securities may also entail prepayment risk, which may vary depending on the type of asset.


• Foreign Money Market Securities. Investing in money market securities of foreign issuers involves some additional risks, including the possibility of adverse political, economic or other developments affecting the issuers of these securities.


•  Repurchase Agreements. Repurchase agreements are subject to risks associated with the possibility of default by the seller at a time when the collateral has declined in value, or insolvency of the seller, which may affect the Portfolio's right to control the collateral and result in certain costs and delays. Repurchase agreements may involve a greater degree of credit risk than investments in U.S. government securities.


•  Municipal Obligations. To the extent the Portfolio invests in municipal obligations issued by state and local governments and their agencies, the Portfolio may be susceptible to political, economic, regulatory or other factors affecting issuers of these municipal obligations. To the extent that the Portfolio invests in municipal obligations of issuers in the same economic sector, it could be more sensitive to economic, business or political developments which affect such sector.


Shares of the Portfolio are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.

Risk Money Market Fund [Text] rr_RiskMoneyMarketFund Although the Portfolio seeks to preserve the value of your investment at $1.00 per share, if it is unable to do so, it is possible to lose money by investing in the Portfolio.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Shares of the Portfolio are not bank deposits and are not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Past Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the performance of the Portfolio's Class X shares from year-to-year and by showing the average annual returns of the Portfolio's Class X shares for the one, five and 10 year periods. This performance information does not include the impact of any charges deducted by your insurance company. If it did, returns would be lower. The Portfolio's past performance is not necessarily an indication of how the Portfolio will perform in the future.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the risks of investing in the Portfolio by showing changes in the performance of the Portfolio's Class X shares from year-to-year and by showing the average annual returns of the Portfolio's Class X shares for the one, five and 10 year periods.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Portfolio's past performance is not necessarily an indication of how the Portfolio will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns—Calendar Years
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
High Quarter  

9/30/07:

   

1.22

%

 

Low Quarter

 

6/30/09:

   

0.00

%

 
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel High Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2007
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.22%rr_BarChartHighestQuarterlyReturn
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Low Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn 0.00%rr_BarChartLowestQuarterlyReturn
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns For Periods Ended December 31, 2014
X
  
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.45%rr_ManagementFeesOverAssets
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Distribution (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.25%rr_OtherExpensesOverAssets
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Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 0.70%rr_ExpensesOverAssets
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Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.51%)rr_FeeWaiverOrReimbursementOverAssets
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Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.19%rr_NetExpensesOverAssets
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Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 19rr_ExpenseExampleYear01
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Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 61rr_ExpenseExampleYear03
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Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 107rr_ExpenseExampleYear05
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Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 243rr_ExpenseExampleYear10
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Annual Return 2005 rr_AnnualReturn2005 2.79%rr_AnnualReturn2005
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Annual Return 2006 rr_AnnualReturn2006 4.61%rr_AnnualReturn2006
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Annual Return 2007 rr_AnnualReturn2007 4.93%rr_AnnualReturn2007
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Annual Return 2008 rr_AnnualReturn2008 2.45%rr_AnnualReturn2008
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Annual Return 2009 rr_AnnualReturn2009 0.03%rr_AnnualReturn2009
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Annual Return 2010 rr_AnnualReturn2010 0.01%rr_AnnualReturn2010
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Annual Return 2011 rr_AnnualReturn2011 0.01%rr_AnnualReturn2011
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Annual Return 2012 rr_AnnualReturn2012 0.01%rr_AnnualReturn2012
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Annual Return 2013 rr_AnnualReturn2013 0.01%rr_AnnualReturn2013
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Annual Return 2014 rr_AnnualReturn2014 0.01%rr_AnnualReturn2014
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Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.01%rr_AverageAnnualReturnYear01
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Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.01%rr_AverageAnnualReturnYear05
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Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.47%rr_AverageAnnualReturnYear10
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[1] The Portfolio's "Adviser" and "Administrator," Morgan Stanley Investment Management Inc., has agreed to waive and/or reimburse all or a portion of the Portfolio's advisory fee and administration fee, respectively, to the extent that total expenses exceed total income on a daily basis. These fee waivers and/or expense reimbursements will continue for at least one year or until such time as the Fund's Board of Trustees acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.