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Guaranteed Benefit Features (Tables)
6 Months Ended
Jun. 30, 2011
Notes to Financial Statements [Abstract]  
Information on guaranteed death benefit features
        As of  As of  
       June 30,December 31, 
        2011  2010  
Return of Net Deposits           
Total account value $ 55,648  $ 52,211  
Net amount at risk (1)   591    816  
Average attained age of contract holders  58 years   58 years  
Minimum Return           
Total account value (2) $ 178  $ 187  
Net amount at risk (1)   40    46  
Average attained age of contract holders  71 years   70 years  
Guaranteed minimum return  5%   5%  
Anniversary Contract Value           
Total account value $ 23,757  $ 23,483  
Net amount at risk (1)   1,633    2,183  
Average attained age of contract holders  66 years   66 years  
Summary of guaranteed death benefit liabilities
         For the Six
         Months Ended
         June 30,
         2011 2010
Balance as of beginning-of-year$ 44 $ 71
 Changes in reserves  16   81
 Benefits paid  (19)   (46)
  Balance as of end-of-period$ 41 $ 106
Account balances of variable annuity contracts with guarantees invested in separate accounts
         As of  As of  
        June 30,December 31, 
         2011  2010  
Asset Type           
Domestic equity $ 37,280  $ 35,659  
International equity   14,763    14,172  
Bonds   17,256    15,913  
Money market   6,016    5,725  
 Total $ 75,315  $ 71,469  
                   
Percent of total variable annuity separate account values  98%   98%