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Guarantee Arrangements and Pledged Assets (Details 2) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions $ 298,277
Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 251,379
Non-Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 46,898
Standby Letters of Credit [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Average Life in years 1 year 3 months 18 days
Credit Ratings of the Obligors or the Transactions 7,876
Standby Letters of Credit [Member] | Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 7,063
Standby Letters of Credit [Member] | Non-Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 813
Sell-protection Credit Derivatives [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 290,401
Sell-protection Credit Derivatives [Member] | Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 244,316
Sell-protection Credit Derivatives [Member] | Non-Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 46,085
Sell-protection Credit Derivatives [Member] | Single name CDS [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Average Life in years 2 years 6 months
Credit Ratings of the Obligors or the Transactions 188,999
Sell-protection Credit Derivatives [Member] | Single name CDS [Member] | Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 150,501
Sell-protection Credit Derivatives [Member] | Single name CDS [Member] | Non-Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 38,498
Sell-protection Credit Derivatives [Member] | Structured CDS [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Average Life in years 1 year 7 months 6 days
Credit Ratings of the Obligors or the Transactions 58,024
Sell-protection Credit Derivatives [Member] | Structured CDS [Member] | Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 53,932
Sell-protection Credit Derivatives [Member] | Structured CDS [Member] | Non-Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 4,092
Sell-protection Credit Derivatives [Member] | Index credit derivatives [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Average Life in years 3 years 3 months 18 days
Credit Ratings of the Obligors or the Transactions 29,301
Sell-protection Credit Derivatives [Member] | Index credit derivatives [Member] | Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 28,618
Sell-protection Credit Derivatives [Member] | Index credit derivatives [Member] | Non-Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 683
Sell-protection Credit Derivatives [Member] | Total return swaps [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Average Life in years 7 years 7 months 6 days
Credit Ratings of the Obligors or the Transactions 14,077
Sell-protection Credit Derivatives [Member] | Total return swaps [Member] | Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions 11,265
Sell-protection Credit Derivatives [Member] | Total return swaps [Member] | Non-Investment Grade [Member]
 
Summary of the credit ratings of credit risk related guarantees  
Credit Ratings of the Obligors or the Transactions $ 2,812