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Investments (Details 5) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Investments    
Impairment write-downs $ (39) $ (114)
Change in intent write-downs (44) (69)
Net other-than-temporary impairment losses recognized in earnings (83) (183)
Sales 229 283
Valuation of derivative instruments 11 22
Settlements of derivative instruments 11 (89)
EMA limited partnership income   63
Total realized capital gains and losses 168 96
Fixed income securities
   
Investments    
Net other-than-temporary impairment losses recognized in earnings (64) (155)
Total realized capital gains and losses (29) (27)
Schedule of Available for Sale Securities    
Gross gains on sales of fixed income securities 115 211
Gross loss on sales of fixed income securities $ 90 $ 88