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Investments (Details 8) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Fair Value.    
Fixed income securities $ 78,414 $ 79,612
Equity securities 4,954 4,811
Short-term Investments 2,536 3,279
Derivative instruments (31) (17)
Gross unrealized Gains    
Fixed income securities 3,506 3,257
Equity securities 705 646
Derivatives   2
Gross unrealized Losses    
Fixed income securities (1,594) (2,431)
Equity securities (80) (63)
Derivatives (36) (24)
Unrealized net gains (losses)    
Fixed income securities 1,912 826
Equity securities 625 583
Derivative instruments (36) (22)
EMA limited partnership interests 7  
Unrealized net capital gains and losses, pre-tax 2,508 1,387
Amount recognized for:    
Insurance reserves (217) (41)
DAC and DSI (61) 97
Amounts recognized (278) 56
Deferred income taxes (784) (508)
Total unrealized net capital gains and losses 1,446 935
Fair value of derivative securities classified as assets, with unrealized net gains (losses) in AOCI (5) 2
Fair value of derivative securities classified as liabilities, with unrealized net gains (losses) in AOCI $ 26 $ 19