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Derivative Instruments - Credit Derivatives (Details 9) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Credit Derivatives - supplemental information    
Tranche Credit Default Swap Realized Credit Loss Example Protection $ 1  
Tranche Credit Default Swap Example Portfolio of Exposure 10  
Total credit derivatives and credit-related notes    
Protection sold (2,696,805) (3,021,182)
Protection purchased with identical underlyings 2,656,119 2,884,754
Net protection (sold)/purchased (40,686) (136,428)
Other protection purchased 35,634 78,889
Total credit derivatives
   
Total credit derivatives and credit-related notes    
Protection sold (2,696,675) (3,020,949)
Protection purchased with identical underlyings 2,656,119 2,884,754
Net protection (sold)/purchased (40,556) (136,195)
Other protection purchased 32,914 75,634
Credit default swaps
   
Total credit derivatives and credit-related notes    
Protection sold (2,601,581) (2,954,705)
Protection purchased with identical underlyings 2,610,198 2,879,105
Net protection (sold)/purchased 8,617 (75,600)
Other protection purchased 8,722 42,460
Other credit derivatives
   
Total credit derivatives and credit-related notes    
Protection sold (95,094) (66,244)
Protection purchased with identical underlyings 45,921 5,649
Net protection (sold)/purchased (49,173) (60,595)
Other protection purchased 24,192 33,174
Credit-related notes
   
Total credit derivatives and credit-related notes    
Protection sold (130) (233)
Protection purchased with identical underlyings 0 0
Net protection (sold)/purchased (130) (233)
Other protection purchased $ 2,720 $ 3,255