This example 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 for the time periods indicated;
•	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, under these assumptions your costs would be:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Portfolio typically invests about 60% of its net assets in stocks and 40% in bonds or other fixed-income investments. Stock investments are primarily common stock in large-cap companies. Fixed-income investments are primarily a wide variety of investment grade debt securities, such as corporate debt securities, mortgage-backed securities (including commercial mortgage-backed securities and collateralized mortgage obligations (“CMOs”)) and other asset-backed securities (“ABS”). The Portfolio invests in debt and mortgage-backed securities issued by government-sponsored enterprises (“GSEs”) such as the Federal National Mortgage Association (“FNMA”) and the Federal Home Loan Mortgage Corporation (“FHLMC”). The Portfolio may invest up to 25% of its net assets in foreign securities and may also invest in repurchase agreements and unrated debt securities.

An investment grade debt security is rated BBB- or higher by a nationally recognized statistical rating organization (“NRSRO”), or is an unrated debt security determined by the Advisor to be of comparable credit quality.

The Portfolio is “non-diversified,” which means it may hold securities of a smaller number of issuers and invest a greater percentage of its assets in a particular issuer than a “diversified” fund.

The Portfolio invests in a combination of stocks, bonds and money market instruments in an attempt to provide a complete investment portfolio in a single product. The Advisor monitors the Portfolio’s allocation and may rebalance or reallocate the Portfolio’s assets based on its view of economic and market factors and events. The equity portion of the Portfolio is primarily a large cap core U.S. domestic portfolio, although the Portfolio may also invest in foreign stocks and mid-cap stocks. The equity portion of the Portfolio seeks companies that have the potential to outperform the market through exceptional growth and/or valuation improvement. The fixed-income portion of the Portfolio reflects an active trading strategy, seeking total return.

The Portfolio uses a hedging technique that includes the purchase and sale of U.S. Treasury securities and related futures contracts to manage the duration of the Portfolio and hedge interest rate risk.

Incidental to its main investment strategy, the Portfolio may also use futures contracts as a substitute for direct investment in a particular asset class, in order to facilitate the periodic rebalancing of the Portfolio to maintain its target asset allocation, to make tactical asset allocations and to assist in managing cash.

Sustainable and Socially Responsible Investing. The Portfolio seeks to invest in companies and other enterprises that demonstrate positive environmental, social and governance performance as they address corporate responsibility and sustainability challenges. Calvert believes that there are long-term benefits in an investment philosophy that attaches material weight to the environment, workplace relations, human rights, Indigenous Peoples’ rights, community relations, product safety and impact, and corporate governance and business ethics. Calvert also believes that managing risks and opportunities related to these issues can contribute positively to company performance as well as to investment performance over time. The Portfolio has sustainable and socially responsible investment criteria that reflect specific types of companies in which the Portfolio seeks to invest and seeks to avoid investing.

Investments are first selected for financial soundness and then evaluated according to the Portfolio’s sustainable and socially responsible investment criteria. Investments must be consistent with the Portfolio’s current investment criteria, including financial, sustainability and social responsibility factors, the application of which is in the economic interest of the Portfolio and its shareholders.

Risk Narrative [Text Block]

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You could lose money on your investment in the Portfolio, or the Portfolio could underperform, because of the risks described below. An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Non-Diversification Risk. Because the Portfolio may hold securities of a smaller number of issuers or invest a greater percentage of its assets in a particular issuer than a diversified fund, the gains or losses on a single security may have greater impact on the Portfolio than on a diversified fund.

Management Risk. Individual investments of the Portfolio may not perform as expected, and the portfolio management practices may not achieve the desired result. There is a risk that the Advisor may allocate assets to an asset class that underperforms other asset classes.

Stock Market Risk. The market prices of stocks held by the Portfolio may fall.

Common Stock Risk. Although common stocks have a history of long-term growth in value, their prices fluctuate based on changes in a company’s financial condition, on overall market and economic conditions, and on investors’ perception of a company’s well-being.

Large-Cap Company Risk. Large-cap companies may be unable to respond quickly to new competitive challenges such as changes in technology, and also may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.

Mid-Cap Company Risk. Prices of mid-cap stocks can be more volatile than those of larger, more established companies. Mid-cap companies are more likely to have more limited product lines, fewer capital resources and less depth of management than larger companies.

Foreign Securities Risk. Investing in foreign securities involves additional risks relating to political, social, and economic developments abroad. Other risks result from differences between regulations that apply to U.S. and foreign issuers and markets, and the potential for foreign markets to be less liquid and more volatile than U.S. markets.

Foreign Currency Risk. Securities that trade or are denominated in currencies other than the U.S. dollar may be adversely affected by fluctuations in currency exchange rates. When the U.S. dollar strengthens relative to a foreign currency, the U.S. dollar value of an investment denominated in that currency will typically fall.

Bond Market Risk. The market prices of bonds held by the Portfolio may fall.

Interest Rate Risk. A change in interest rates may adversely affect the value of fixed-income securities. When interest rates rise, the value of fixed-income securities will generally fall. Longer-term securities are subject to greater interest rate risk.

Credit Risk. The credit quality of fixed-income securities may deteriorate, which could lead to default or bankruptcy of the issuer where the issuer becomes unable to pay its obligations when due.

Mortgage-Backed and Asset-Backed Securities Risk. The value of investments in mortgage-backed and asset-backed securities is subject to interest rate risk and credit risk. These securities are also subject to the risk that borrowers will prepay the principal on their loans more quickly than expected (prepayment risk) or more slowly than expected (extension risk), which will affect the yield, average life and price of the securities. In addition, faster-than-expected prepayments may cause the Portfolio to invest the prepaid principal in lower yielding securities and slower than expected prepayments may reduce the potential for the Portfolio to invest in higher yielding securities.

Mortgage-Backed Security Risk (Government-Sponsored Enterprises). Debt and mortgage-backed securities issued by GSEs such as FNMA and FHLMC are neither insured nor guaranteed by the U.S. Treasury and are not backed by the full faith and credit of the U.S. government. Such securities are only supported by the credit of the applicable GSE. The U.S. government has provided financial support to FNMA and FHLMC, but there can be no assurance that it will support these or other GSEs in the future.

Collateralized Mortgage Obligation and Structured Asset-Backed Securities Risk. A CMO is a multiclass bond that is backed by a pool of mortgage loans or mortgage-backed securities. A structured ABS is a multiclass bond that is typically backed by a pool of auto loans, credit card receivables, home equity loans or student loans. A CMO or structured ABS is subject to interest rate risk, credit risk, prepayment risk and extension risk. In addition, if the Portfolio holds a class of a CMO or a structured ABS that is subordinated to other classes backed by the same pool of collateral, the likelihood that the Portfolio will receive payments of principal may be substantially limited.

Unrated Security Risk. Unrated securities may be less liquid than rated securities determined to be of comparable quality. The Portfolio’s purchase of unrated securities depends on the Advisor’s analysis of credit risk without the assessment of an NRSRO.

Active Trading Strategy Risk. The fixed-income portion of the Portfolio employs an active style that seeks to position the Portfolio with securities that offer the greatest price appreciation while minimizing risk. This style can result in higher turnover (exceeding 100%) and may translate to higher transaction costs.

Futures Contracts Risk. The value of a futures contract tends to increase and decrease in tandem with the value of the underlying instrument. The price of futures can be highly volatile; using them could lower total return, and the potential loss from futures can exceed the Portfolio’s initial investment in such contracts.

Repurchase Agreement Risk. A repurchase agreement exposes the fixed income portion of the Portfolio to the risk that the party that sells the security may default on its obligation to repurchase the security. The Portfolio may lose money because it cannot sell the security at the agreed-upon time and price or the security may lose value before it can be sold.

Sustainable and Socially Responsible Investing Risk. The application of the Portfolio's sustainability and socially responsible investment criteria may affect the Portfolio's exposure to certain sectors or types of investments and may impact the Portfolio's relative investment performance – positively or negatively – depending on whether such sectors or investments are in or out of favor in the market.

Risk Nondiversified Status [Text]

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Non-Diversification Risk. Because the Portfolio may hold securities of a smaller number of issuers or invest a greater percentage of its assets in a particular issuer than a diversified fund, the gains or losses on a single security may have greater impact on the Portfolio than on a diversified fund.

Bar Chart and Performance Table [Heading]

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Performance

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table show the Portfolio’s annual returns and its long-term performance, which give some indication of the risks of investing in the Portfolio. The bar chart shows how the performance has varied from year to year. The table compares the Portfolio’s performance over time with that of a benchmark index, a composite index and a peer average.

Performance Past Does Not Indicate Future [Text]

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The Portfolio’s past performance does not necessarily indicate how the Portfolio will perform in the future.

Bar Chart Closing [Text Block]

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	Quarter Ended	Total Return
Best Quarter (of periods shown)	9/30/2009	12.29	%
Worst Quarter (of periods shown)	12/31/2008	-19.63	%

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.69%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

0.86%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

274

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

rr_AnnualReturn2006

rr_AnnualReturn2008

rr_AnnualReturn2010

rr_AnnualReturn2012

rr_AnnualReturn2014

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter (of periods shown)

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.63%)

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

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INVESTMENT OBJECTIVE

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Portfolio Turnover [Heading]

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Portfolio Turnover

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

91.00%

Expense Example Narrative [Text Block]

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This example 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 for the time periods indicated;
•	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, under these assumptions your costs would be:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Portfolio normally invests at least 80% of its net assets, including borrowings for investment purposes, in the common stocks of mid-cap companies. The Portfolio will provide shareholders with at least 60 days’ notice before changing this 80% policy. The Portfolio currently defines mid-cap companies as those whose market capitalization falls within the range of the Russell Midcap Growth Index at the time of investment. As of December 31, 2014, the market capitalization of the Russell Midcap Growth Index companies ranged from $276.8 million to $33.7 billion with a weighted average level of $13.9 billion.

Stocks chosen for the Portfolio combine growth and value characteristics or offer the opportunity to buy growth at a reasonable price. The Portfolio may also invest up to 25% of its net assets in foreign securities.

The Portfolio is “non-diversified,” which means it may hold securities of a smaller number of issuers and invest a greater percentage of its assets in a particular issuer than a “diversified” fund.

The Subadvisor favors companies which have an above market average prospective growth rate, but sell at below market average valuations. The Subadvisor evaluates each stock in terms of its growth potential, the return for risk free investments, and the risk and reward potential for the company to determine a reasonable price for the stock.

Sustainable and Socially Responsible Investing. The Portfolio seeks to invest in companies and other enterprises that demonstrate positive environmental, social and governance performance as they address corporate responsibility and sustainability challenges. Calvert believes that there are long-term benefits in an investment philosophy that attaches material weight to the environment, workplace relations, human rights, Indigenous Peoples’ rights, community relations, product safety and impact, and corporate governance and business ethics. Calvert also believes that managing risks and opportunities related to these issues can contribute positively to company performance as well as to investment performance over time. The Portfolio has sustainable and socially responsible investment criteria that reflect specific types of companies in which the Portfolio seeks to invest and seeks to avoid investing.

Investments are first selected for financial soundness and then evaluated according to the Portfolio’s sustainable and socially responsible investment criteria. Investments must be consistent with the Portfolio’s current investment criteria, including financial, sustainability and social responsibility factors, the application of which is in the economic interest of the Portfolio and its shareholders.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

You could lose money on your investment in the Portfolio, or the Portfolio could underperform, because of the risks described below. An investment in the Portfolio is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Non-Diversification Risk. Because the Portfolio may hold securities of a smaller number of issuers or invest a greater percentage of its assets in a particular issuer than a diversified fund, the gains or losses on a single security may have greater impact on the Portfolio than on a diversified fund.

Management Risk. Individual investments of the Portfolio may not perform as expected, and the portfolio management practices may not achieve the desired result.

Stock Market Risk. The market prices of stocks held by the Portfolio may fall.

Common Stock Risk. Although common stocks have a history of long-term growth in value, their prices fluctuate based on changes in a company’s financial condition, on overall market and economic conditions, and on investors’ perception of a company’s well-being.

Mid-Cap Company Risk. Prices of mid-cap stocks can be more volatile than those of larger, more established companies. Mid-cap companies are more likely to have more limited product lines, fewer capital resources and less depth of management than larger companies.

Growth Company Risk. Prices of growth company securities may fall more than the overall equity markets due to changing economic, political or market conditions or disappointing growth company earnings results. Growth stocks also generally lack the dividends of some value stocks that can cushion stock prices in a falling market.

Value Stock Risk. Value stocks may perform differently from the market as a whole, which may not recognize a stock's intrinsic value for an unexpectedly long time. In addition, there is a risk that the portfolio manager's calculation of the stock's underlying value will not be reflected in the market price.

Foreign Securities Risk. Investing in foreign securities involves additional risks relating to political, social, and economic developments abroad. Other risks result from differences between regulations that apply to U.S. and foreign issuers and markets, and the potential for foreign markets to be less liquid and more volatile than U.S. markets.

Foreign Currency Risk. Securities that trade or are denominated in currencies other than the U.S. dollar may be adversely affected by fluctuations in currency exchange rates. When the U.S. dollar strengthens relative to a foreign currency, the U.S. dollar value of an investment denominated in that currency will typically fall.

Sustainable and Socially Responsible Investing Risk. The application of the Portfolio's sustainability and socially responsible investment criteria may affect the Portfolio's exposure to certain sectors or types of investments and may impact the Portfolio's relative investment performance – positively or negatively – depending on whether such sectors or investments are in or out of favor in the market.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Non-Diversification Risk. Because the Portfolio may hold securities of a smaller number of issuers or invest a greater percentage of its assets in a particular issuer than a diversified fund, the gains or losses on a single security may have greater impact on the Portfolio than on a diversified fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table show the Portfolio’s annual returns and its long-term performance, which give some indication of the risks of investing in the Portfolio. The bar chart shows how the performance has varied from year to year. The table compares the Portfolio’s performance over time with that of a benchmark index and a peer average.

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The Portfolio’s past performance does not necessarily indicate how the Portfolio will perform in the future.

Bar Chart Closing [Text Block]

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	Quarter Ended	Total Return
Best Quarter (of periods shown)	12/31/2010	17.55	%
Worst Quarter (of periods shown)	12/31/2008	-25.51	%

Label

rr_AverageAnnualReturnLabel

Russell Midcap Growth Index (reflects no deduction for fees or expenses)

5 Years

rr_AverageAnnualReturnYear05

16.94%

Label

rr_AverageAnnualReturnLabel

Lipper VA Mid-Cap Core Funds Average

5 Years

rr_AverageAnnualReturnYear05

15.00%

Maximum Cumulative Sales Charge (as a percentage of Offering Price)

rr_MaximumCumulativeSalesChargeOverOfferingPrice

none

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.90%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.16%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

368

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

rr_AnnualReturn2006

rr_AnnualReturn2008

rr_AnnualReturn2010

rr_AnnualReturn2012

rr_AnnualReturn2014

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2010

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst Quarter (of periods shown)

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(25.51%)

1 Year

rr_AverageAnnualReturnYear01

8.09%

10 Years

rr_AverageAnnualReturnYear10

8.02%

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

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INVESTMENT OBJECTIVE

Expense [Heading]

rr_ExpenseHeading

FEES AND EXPENSES OF THE PORTFOLIO

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

97.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

This example 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 for the time periods indicated;
•	your investment has a 5% return each year;
•	the Portfolio’s operating expenses remain the same; and
•	any Calvert expense limitation is in effect for the period indicated in the fee table above.