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Derivatives and Hedging Activities (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Derivatives and Hedging Activities (Textuals) [Abstract]    
Netting of derivative assets and derivative liabilities $ 21 $ 18
Other Assets [Member]
   
Derivative Asset, Fair Value [Abstract]    
Derivatives assets designated as hedging instruments 1,005 977
Derivatives assets not designated as hedging instruments 66 112
Total fair value of derivatives assets 1,071 1,089
Other Assets [Member] | Fair Value Hedging [Member]
   
Derivative Asset, Fair Value [Abstract]    
Derivatives assets designated as hedging instruments 864 909
Other Assets [Member] | Cash flow hedges [Member]
   
Derivative Asset, Fair Value [Abstract]    
Derivatives assets designated as hedging instruments 0 2
Other Assets [Member] | Net investment hedges [Member]
   
Derivative Asset, Fair Value [Abstract]    
Derivatives assets designated as hedging instruments 141 66
Other Assets [Member] | Interest rate contracts [Member]
   
Derivative Asset, Fair Value [Abstract]    
Derivatives assets not designated as hedging instruments 2 3
Other Assets [Member] | Foreign exchange contracts [Member]
   
Derivative Asset, Fair Value [Abstract]    
Derivatives assets not designated as hedging instruments 64 109
Other Assets [Member] | Equity-linked contract [Member]
   
Derivative Asset, Fair Value [Abstract]    
Derivatives assets not designated as hedging instruments 0 0
Other Liabilities [Member]
   
Derivative Liability, Fair Value [Abstract]    
Derivatives liabilities designated as hedging instruments 109 323
Derivatives liabilities not designated as hedging instruments 95 96
Total fair value of derivatives liabilties 204 419
Other Liabilities [Member] | Fair Value Hedging [Member]
   
Derivative Liability, Fair Value [Abstract]    
Derivatives liabilities designated as hedging instruments 9 38
Other Liabilities [Member] | Cash flow hedges [Member]
   
Derivative Liability, Fair Value [Abstract]    
Derivatives liabilities designated as hedging instruments 0 13
Other Liabilities [Member] | Net investment hedges [Member]
   
Derivative Liability, Fair Value [Abstract]    
Derivatives liabilities designated as hedging instruments 100 272
Other Liabilities [Member] | Interest rate contracts [Member]
   
Derivative Liability, Fair Value [Abstract]    
Derivatives liabilities not designated as hedging instruments 3 3
Other Liabilities [Member] | Foreign exchange contracts [Member]
   
Derivative Liability, Fair Value [Abstract]    
Derivatives liabilities not designated as hedging instruments 90 91
Other Liabilities [Member] | Equity-linked contract [Member]
   
Derivative Liability, Fair Value [Abstract]    
Derivatives liabilities not designated as hedging instruments $ 2 $ 2