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Investments (Details 5) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Investments    
Impairment write-downs $ (2) $ (20)
Change in intent write-downs (7) (16)
Net other-than-temporary impairment losses recognized in earnings (9) (36)
Sales 21 (9)
Valuation of derivative instruments (4) 8
Settlements of derivative instruments 11 15
Total realized capital gains and losses 19 (22)
Fixed income securities
   
Investments    
Net other-than-temporary impairment losses recognized in earnings (33) (34)
Total realized capital gains and losses (18) (50)
Schedule of Available for Sale Securities    
Gross gains on sales of fixed income securities 24 45
Gross losses on sales of fixed income securities $ 9 $ 66