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Financial Instruments Derivative Activities Table (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Credit default swaps [Member]
    
Primary underlying risk:    
Long Notional Exposure $ 8 $ 8
Short Notional Exposure 0 0
Foreign currency fowards [Member]
    
Primary underlying risk:    
Long Notional Exposure 77 0
Short Notional Exposure 1,428 (474)
Interest rate swap contracts [Member]
    
Primary underlying risk:    
Long Notional Exposure 1,253  
Short Notional Exposure 0  
Commodity contracts [Member]
    
Primary underlying risk:    
Long Notional Exposure 81 2
Short Notional Exposure 7 (150)
Equity Swap [Member]
    
Primary underlying risk:    
Long Notional Exposure 4 7
Short Notional Exposure 9,340 (2,055)
Futures Index Spread [Member]
    
Primary underlying risk:    
Long Notional Exposure   0
Short Notional Exposure   $ 0