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Investments (Details 5) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Investments        
Impairment write-downs $ (16) $ (6) $ (18) $ (26)
Change in intent write-downs (1)   (8) (16)
Net other-than-temporary impairment losses recognized in earnings (17) (6) (26) (42)
Sales 63 9 84  
Valuation of derivative instruments 6 (11) 2 (3)
Settlements of derivative instruments 6 15 17 30
Total realized capital gains and losses 58 7 77 (15)
Fixed income securities
       
Investments        
Net other-than-temporary impairment losses recognized in earnings (3) (12) (36) (46)
Total realized capital gains and losses 24 (6) 6 (56)
Schedule of Available for Sale Securities        
Gross gains on sales of fixed income securities 42 32 66 77
Gross losses on sales of fixed income securities $ 15 $ 31 $ 24 $ 97