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Financial Instruments Gain (Loss) Recognized on Derivatives Not Designated as Hedging Table (Details) (Not Designated as Hedging Instrument [Member], Net Gain from Investment Activities [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Derivative [Line Items]        
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging $ 5 [1] $ 7 [1] $ (438) [1] $ 39 [1]
Equity Contract [Member]
        
Derivative [Line Items]        
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging (59) [1] 1 [1] (461) [1] 10 [1]
Foreign Exchange Contract [Member]
        
Derivative [Line Items]        
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging 66 [1] (2) [1] 25 [1] (13) [1]
Credit Risk Contract [Member]
        
Derivative [Line Items]        
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging 0 [1] (6) [1] 0 [1] 19 [1]
Futures Index Spread [Member]
        
Derivative [Line Items]        
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging 0 [1] 14 [1] 0 [1] 23 [1]
Commodity contracts [Member]
        
Derivative [Line Items]        
Gain (Loss) Recognized in Income, Derivatives Not Designated as Hedging $ (2) [1] $ 0 [1] $ (2) [1] $ 0 [1]
[1] Gains (losses) recognized on derivatives are classified in net gain from investment activities in our consolidated statements of operations.