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Investments (Details 5) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Investments        
Impairment write-downs $ (12) $ (85) $ (38) $ (174)
Change in intent write-downs (1) (3) (17) (50)
Net other-than-temporary impairment losses recognized in earnings (13) (88) (55) (224)
Sales (52) 481 (52) 705
Valuation of derivative instruments (3) (196) (6) (227)
Settlements of derivative instruments 11 10 41 20
EMA limited partnership income   11   61
Total realized capital gains and losses (57) 218 (72) 335
Fixed income securities
       
Investments        
Net other-than-temporary impairment losses recognized in earnings (9) (54) (55) (173)
Total realized capital gains and losses (60) 429 (116) 494
Schedule of Available for Sale Securities        
Gross gains on sales of fixed income securities 51 491 128 748
Gross losses on sales of fixed income securities $ 112 $ 17 $ 209 $ 117