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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 $ (4) $ (2)
Change in intent write-downs (5) (7)
Net other-than-temporary impairment losses recognized in earnings (9) (9)
Sales 7 21
Valuation of derivative instruments 3 (4)
Settlements of derivative instruments (1) 11
Total realized capital gains and losses   19
Fixed income securities
   
Investments    
Net other-than-temporary impairment losses recognized in earnings (2) (33)
Total realized capital gains and losses (5) (18)
Schedule of Available for Sale Securities    
Gross gains on sales of fixed income securities 17 25
Gross losses on sales of fixed income securities $ 14 $ 9