v2.4.0.6
Other Assets (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Components of Other Assets [Line Items]      
Cost Method Investments $ 8,061 $ 8,494  
Principal investments 236 305  
Total nonmarketable equity investments 16,808 16,423  
Corporate/bank-owned life insurance 20,146 19,845  
Accounts receivable 25,939 23,763  
Interest receivable 5,296 4,895  
Customer relationship and other amortized intangibles 10,358 12,170  
Operating lease assets 1,825 1,873  
Due from customers on acceptances 225 229  
Other 17,172 15,993  
Other assets 101,022 99,781  
Income Related to Nonmarketable Equity Investments [Abstract]      
Net gains (losses) from private equity investments 813 492 (368)
Net gains (losses) from principal investments 29 42 79
Net gains (losses) from all other nonmarketable equity investments (298) (188) (234)
Net gains (losses) from nonmarketable equity investments 544 346 (523)
Government insured or guaranteed [Member]
      
Components of Other Assets [Line Items]      
Foreclosed assets 1,319 1,479  
Non-government insured or guaranteed [Member]
      
Components of Other Assets [Line Items]      
Foreclosed assets 3,342 4,530  
Core deposit intangibles [Member]
      
Components of Other Assets [Line Items]      
Customer relationship and other amortized intangibles 7,311 8,904  
Customer Relationships And Other [Member]
      
Components of Other Assets [Line Items]      
Customer relationship and other amortized intangibles 1,639 1,847  
Federal Bank Stock [Member]
      
Components of Other Assets [Line Items]      
Cost Method Investments 4,617 5,254  
Private Equity Investments Cost Method [Member]
      
Components of Other Assets [Line Items]      
Cost Method Investments 3,444 3,240  
Low Income Housing Tax Credit Equity Method Investments [Member]
      
Components of Other Assets [Line Items]      
Equity method 4,077 3,611  
Equity Investments Other [Member]
      
Components of Other Assets [Line Items]      
Equity method $ 4,434 $ 4,013