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Fair Value Option - Aggregate Differences (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Long-term debt    
Long-term debt $ 249,024 $ 256,775
Carrying value
   
Loans    
Nonaccrual loans 4,333 5,695
Total loans 50,628 45,312
Carrying value | Trading assets
   
Loans    
Nonaccrual loans 4,217 4,875
All other performing loans 44,084 37,481
Carrying value | Total loans
   
Loans    
Nonaccrual loans 116 820
All other performing loans 2,211 2,136
Carrying value | Principal Protected Debt
   
Long-term debt    
Long-term debt 16,541 19,417
Portion at Fair Value, Fair Value Disclosure [Member]
   
Loans    
Nonaccrual loans 1,024 1,197
Total loans 43,704 35,455
Long-term debt    
Long-term debt 30,788 34,720
Long-term beneficial interests    
Total long-term beneficial interests 1,170 1,250
Portion at Fair Value, Fair Value Disclosure [Member] | Trading assets
   
Loans    
Nonaccrual loans 960 1,141
All other performing loans 40,581 32,657
Portion at Fair Value, Fair Value Disclosure [Member] | Total loans
   
Loans    
Nonaccrual loans 64 56
All other performing loans 2,099 1,601
Portion at Fair Value, Fair Value Disclosure [Member] | Principal Protected Debt
   
Long-term debt    
Long-term debt 16,391 19,890
Portion at Fair Value, Fair Value Disclosure [Member] | Non Principal Protected Debt
   
Long-term debt    
Long-term debt 14,397 14,830
Long-term beneficial interests    
Total long-term beneficial interests 1,170 1,250
Change During Period, Fair Value Disclosure [Member]
   
Loans    
Nonaccrual loans (3,309) (4,498)
Total loans (6,924) (9,857)
Change During Period, Fair Value Disclosure [Member] | Trading assets
   
Loans    
Nonaccrual loans (3,257) (3,734)
All other performing loans (3,503) (4,824)
Change During Period, Fair Value Disclosure [Member] | Total loans
   
Loans    
Nonaccrual loans (52) (764)
All other performing loans (112) (535)
Change During Period, Fair Value Disclosure [Member] | Principal Protected Debt
   
Long-term debt    
Long-term debt (150) 473
Other Guarantees and Commitments [Member]
   
Long-term beneficial interests    
Guarantor Obligations, Maximum Exposure, Undiscounted 6,780 6,321
Guarantor Obligations, Current Carrying Value (75) (5)
Letters Of Credit Hedged By Derivative Transactions [Member] | Other Guarantees and Commitments [Member]
   
Long-term beneficial interests    
Guarantor Obligations, Maximum Exposure, Undiscounted 4,500 3,900
Guarantor Obligations, Current Carrying Value $ (75) $ (5)