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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 $ (43) $ (190) $ (131) $ (374)
Change in intent write-downs (3) (13) (48) (98)
Net other-than-temporary impairment losses recognized in earnings (46) (203) (179) (472)
Sales (24) 692 275 1,116
Valuation of derivative instruments   (254) 1 (282)
Settlements of derivative instruments (2) 20 26 (72)
EMA limited partnership income   9   127
Total realized capital gains and losses (72) 264 123 417
Fixed income securities
       
Investments        
Net other-than-temporary impairment losses recognized in earnings (18) (86) (109) (305)
Total realized capital gains and losses (50) 603 (73) 615
Schedule of Available for Sale Securities        
Gross gains on sales of fixed income securities 109 709 296 1,100
Gross loss on sales of fixed income securities $ 154 $ 32 $ 291 $ 218