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Income Account (Prospectus Summary) | Income Account
Income Account
Objective:
The Account seeks to provide a high level of current income consistent with preservation of capital.   
Fees and Expenses of the Account
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.
Annual Account Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Annual Fund Operating Expenses Income Account
Class 1
Class 2
Management Fees 0.50% 0.50%
Distribution and/or Service (12b-1) Fees    0.25%
Other Expenses      
Total Annual Account Operating Expenses 0.50% 0.75%
Example
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:
Expense Example Income Account (USD $)
Expense Example, With Redemption, 1 Year
Expense Example, With Redemption, 3 Years
Expense Example, With Redemption, 5 Years
Expense Example, With Redemption, 10 Years
Class 1
51 160 280 628
Class 2
77 240 417 930
Portfolio Turnover
The Account 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. These costs, which are not reflected in
annual Account operating expenses or in the example, affect the Account's
performance. During the most recent fiscal year, the Account's portfolio
turnover rate was 17.8% of the average value of its portfolio.
Principal Investment Strategies
The Account invests primarily in a diversified pool of fixed-income securities
including corporate securities, U.S. government securities, and mortgage-backed
securities (including collateralized mortgage obligations), up to 35% of which
may be in below investment-grade fixed-income securities (sometimes called "junk
bonds") (rated at the time of purchase BB+ or lower by S&P or Ba1 or lower by
Moody's). Under normal circumstances, the Account maintains an average portfolio
duration that is within ±25% of the duration of the Barclays Capital Aggregate
Bond Index, which as of December 31, 2011 was 5.34 years. The Account may also
invest in foreign securities, including those from emerging markets, and real
estate investment trust ("REIT") securities.

During the fiscal year ended December 31, 2011, the average ratings of the
Account's fixed-income assets, based on market value at each month-end, were as
follows (all ratings are by Moody's):

26.62% in securities rated Aaa 36.34% in securities rated Baa 2.71% in securities rated Caa
2.17% in securities rated Aa   5.81% in securities rated Ba   0.05% in securities rated D
16.45% in securities rated A   8.38% in securities rated B    1.47% in securities not rated
Principal Risks
The Account may be an appropriate investment for investors seeking
diversification by investing in a fixed-income mutual fund, and who are willing
to accept the risks associated with investing in "junk bonds," foreign
securities, and real estate investment trust securities.

The value of your investment in the Account changes with the value of the
Account's investments. Many factors affect that value, and it is possible to
lose money by investing in the Account. 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. The principal risks of
investing in the Account, in alphabetical order, are:

Currency Risk.  Risks of investing in securities denominated in, or that trade
in, foreign (non-U.S.) currencies include changes in foreign exchange rates and
foreign exchange restrictions.

Emerging Market Risk. Investments in emerging market countries may have more
risk than those in developed market countries because the emerging markets are
less developed and more illiquid. Emerging market countries can also be subject
to increased social, economic, regulatory, and political uncertainties and can
be extremely volatile.

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).

High Yield Securities Risk. High yield fixed-income securities (commonly
referred to as "junk bonds") are subject to greater credit quality risk than
higher rated fixed-income securities and should be considered speculative.

Portfolio Duration Risk. Portfolio duration is a measure of the expected life of
a fixed-income security and its sensitivity to changes in interest rates. The
longer a fund's average portfolio duration, the more sensitive the fund will be
to changes in interest rates.

Prepayment Risk. Unscheduled prepayments on mortgage-backed and asset-backed
securities may have to be reinvested at lower rates. A reduction in prepayments
may increase the effective maturities of these securities, exposing them to the
risk of decline in market value over time (extension risk).

Real Estate Investment Trusts ("REITs") Risk. A REIT could fail to qualify for
tax-free pass-through of income under the Internal Revenue Code, and fund
shareholders will indirectly bear their proportionate share of the expenses of
REITs in which the fund invests.

Real Estate Securities Risk. Real estate securities are subject to the risks
associated with direct ownership of real estate, including declines in value,
adverse economic conditions, increases in expenses, regulatory changes and
environmental problems.

Risk of Being an Underlying Fund. An underlying fund of a fund of funds may
experience relatively large redemptions or investments as the fund of funds
periodically reallocates or rebalances its assets. These transactions may cause
the underlying fund to sell portfolio securities to meet such redemptions, or to
invest cash from such investments, at times it would not otherwise do so, and
may as a result increase transaction costs and adversely affect underlying fund
performance.

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.
Performance
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 reflects the performance of the predecessor fund. 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.
Calendar Year Total Returns (%) as of 12/31 each year (Class 1 Shares)
Bar Chart
Highest return for a quarter during the period of the bar              
chart above:                                                    Q2 '09     7.98%
Lowest return for a quarter during the period of the bar               
chart above:                                                    Q3 '08    -4.21%
Average Annual Total Returns (%) For the periods ended December 31, 2011
Average Annual Total Returns Income Account
Average Annual Returns, Label
Average Annual Returns, 1 Year
Average Annual Returns, 5 Years
Average Annual Returns, 10 Years
Average Annual Returns, Inception Date
Class 1
Income Account - Class 1 6.25% 6.91% 6.66% May 07, 1993
Class 2
Income Account - Class 2 6.05% 6.67% 6.40% Nov. 06, 2001
Barclays Capital Aggregate Bond Index
Barclays Capital Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) 7.84% 6.50% 5.78%