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Variable Interest Entities (Details 1) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Additional Information on Unconsolidated VIEs      
Variable Interests Held Classified as Assets $ 1,533 $ 1,392  
Variable Interests Held Classified as Liabilities 187 88  
Total Assets in Unconsolidated VIEs 20,817 21,594  
Maximum exposure to loss 3,211   2,470
Asset Backed Commercial Paper Conduits [Member]
     
Additional Information on Unconsolidated VIEs      
Total Assets in Unconsolidated VIEs 13,939 14,989  
Maximum exposure to loss 1,142 677  
Structured Note Vehicles [Member]
     
Additional Information on Unconsolidated VIEs      
Variable Interests Held Classified as Assets 1,533 1,392  
Variable Interests Held Classified as Liabilities 187 88  
Total Assets in Unconsolidated VIEs 6,878 6,605  
Maximum exposure to loss $ 2,069 $ 1,793