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Guarantee Arrangements and Pledged Assets (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements    
Carrying Value $ (4,299) $ (7,759)
Notional/Maximum Exposure to Loss 299,419 338,865
Credit derivatives [Member]
   
Total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements    
Carrying Value (4,299) (7,759)
Notional/Maximum Exposure to Loss 290,401 330,395
Financial standby letters of credit, net of participations [Member]
   
Total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements    
Notional/Maximum Exposure to Loss 5,016 4,705
Performance (non-financial) guarantees [Member]
   
Total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements    
Notional/Maximum Exposure to Loss 2,860 3,088
Liquidity asset purchase agreements [Member]
   
Total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements    
Notional/Maximum Exposure to Loss $ 1,142 $ 677