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Fair Values of Assets and Liabilities (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
GMWB and GMAB Embedded Derivatives
Mar. 31, 2012
GMWB and GMAB Embedded Derivatives
Mar. 31, 2013
Corporate Debt Securities
Mar. 31, 2012
Corporate Debt Securities
Mar. 31, 2013
Residential Mortgage Backed Securities
Mar. 31, 2012
Residential Mortgage Backed Securities
Mar. 31, 2013
Commercial Mortgage Backed Securities
Mar. 31, 2012
Commercial Mortgage Backed Securities
Dec. 31, 2011
Commercial Mortgage Backed Securities
Mar. 31, 2013
Asset Backed Securities
Mar. 31, 2012
Asset Backed Securities
Mar. 31, 2012
Other Structured Investments
Mar. 31, 2013
Available-for-Sale Securities: Fixed Maturities
Mar. 31, 2012
Available-for-Sale Securities: Fixed Maturities
Mar. 31, 2012
Common Stock
Available-for-Sale securities:                                  
Balance at the beginning of the period         $ 1,654 $ 1,342 $ 23 $ 58 $ 170 $ 16 $ 16 $ 156 $ 133 $ 14 $ 2,003 $ 1,563  
Net income               (2)       1     1 (2)  
Other comprehensive income           4   5 (2)     4   1 2 10  
Purchases         54 98   24             54 122 1
Settlements         (55) (51)   (3)       (1)     (56) (54)  
Transfers into Level 3                         7     7  
Transfers out of Level 3             (15)               (15)    
Balance at the end of the period         1,653 1,393 8 82 168 16 16 160 140 15 1,989 1,646 1
Future Policy Benefits:                                  
Balance at the beginning of the period     (833) (1,585)                          
Net income     618 784                          
Issues     50 (39)                          
Settlements     (1)                            
Balance at the end of the period     (266) (840)                          
Changes in unrealized gains (losses) relating to assets and liabilities held at the end of the period included in:                                  
Net investment income                       1     1    
Net realized investment gains (losses)               2               2  
Benefits, claims, losses and settlement expenses     609 769                          
Loss included in net realized investment gains (losses)   2                              
Gain included in net investment income 1                                
Cumulative embedded derivative liability     $ (65) $ (115)