v2.4.0.6
Other Assets (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components of other assets [Line Items]      
Cost method investments $ 6,799 $ 8,061  
Equity method investments 10,923 8,747  
Total nonmarketable equity investments 17,722 16,808  
Corporate/bank-owned life insurance 18,649 20,146  
Accounts receivable 25,828 25,939  
Interest receivable 5,006 5,296  
Customer relationship and other amortized intangibles 8,427 10,358  
Operating lease assets 2,001 1,825  
Due from customers on acceptances 282 225  
Other 12,800 17,172  
Other assets 93,578 101,022  
Income Related to Nonmarketable Equity Investments [Abstract]      
Net realized gains from private equity investments 1,086 842 534
All other (185) (298) (188)
Total 901 544 346
Government Insured Or Guaranteed [Member]
      
Components of other assets [Line Items]      
Foreclosed assets 1,509 1,319  
Non Government Insured Or Guaranteed [Member]
      
Components of other assets [Line Items]      
Foreclosed assets 2,514 3,342  
Core deposit intangibles [Member]
      
Components of other assets [Line Items]      
Customer relationship and other amortized intangibles 5,915 7,311  
Customer Relationships And Other [Member]
      
Components of other assets [Line Items]      
Customer relationship and other amortized intangibles 1,352 1,639  
Federal Bank Stock [Member]
      
Components of other assets [Line Items]      
Cost method investments 4,227 4,617  
Private Equity Investments Cost Method [Member]
      
Components of other assets [Line Items]      
Cost method investments 2,572 3,444  
Low Income Housing Tax Credit Equity Method Investments [Member]
      
Components of other assets [Line Items]      
Equity method investments 4,767 4,077  
Private Equity and Other Investments [Member]
      
Components of other assets [Line Items]      
Equity method investments $ 6,156 $ 4,670