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Guaranteed Benefit Features (Tables)
6 Months Ended
Jun. 30, 2012
Notes to Financial Statements [Abstract]  
Information on guaranteed death benefit features
        As of  As of  
        June 30, December 31, 
        2012  2011  
Return of Net Deposits           
Total account value $ 58,260  $ 54,004  
Net amount at risk (1)   812    1,379  
Average attained age of contract holders  59 years   59 years  
Minimum Return           
Total account value $ 151  $ 155  
Net amount at risk (1)   42    48  
Average attained age of contract holders  72 years   72 years  
Guaranteed minimum return  5%   5%  
Anniversary Contract Value           
Total account value $ 22,255  $ 21,648  
Net amount at risk (1)   1,963    2,939  
Average attained age of contract holders  67 years   67 years  
Summary of guaranteed death benefit liabilities
         For the Six
         Months Ended
         June 30,
         2012 2011
Balance as of beginning-of-year$ 84 $ 44
 Changes in reserves  7   16
 Benefits paid  (24)   (19)
  Balance as of end-of-period$ 67 $ 41
Account balances of variable annuity contracts with guarantees invested in separate accounts
         As of  As of  
        June 30, December 31, 
         2012  2011  
Asset Type           
Domestic equity $ 34,700  $ 34,286  
International equity   13,194    13,095  
Bonds   18,148    17,735  
Money market   5,948    5,892  
 Total $ 71,990  $ 71,008  
                   
Percent of total variable annuity separate account values  93%   98%