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Investments (Details 5) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Investments    
Impairment write-downs $ (16) $ (10)
Change in intent write-downs (65) (27)
Net other-than-temporary impairment losses recognized in earnings (81) (37)
Sales 147 172
Valuation of derivative instruments (4) (4)
Settlements of derivative instruments (8)  
Total realized capital gains and losses 54 131
Fixed income and equity securities
   
Schedule of Available for Sale Securities    
Gross gains on sales of fixed income securities 166 183
Gross loss on sales of fixed income securities $ 36 $ 21