v2.4.0.8
Other Assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Components of other assets [Line Items]          
Cost method investments $ 6,519   $ 6,519   $ 6,799
Equity method investments 10,672   10,672   10,923
Fair value investments 595   595   0
Total nonmarketable equity investments 17,786   17,786   17,722
Corporate/bank-owned life insurance 18,692   18,692   18,649
Accounts receivable 25,845   25,845   25,828
Interest receivable 5,192   5,192   5,006
Customer relationship and other amortized intangibles 7,687   7,687   8,427
Operating lease assets 2,010   2,010   2,001
Due from customers on acceptances 353   353   282
Other 11,379   11,379   12,800
Other assets 90,908   90,908   93,578
Income Related to Nonmarketable Equity Investments [Abstract]          
Net realized gains from private equity investments 179 159 224 290  
All other (128) (45) (91) (24)  
Total 51 114 133 266  
Government Insured Or Guaranteed [Member]
          
Components of other assets [Line Items]          
Foreclosed assets 1,026   1,026   1,509
Non Government Insured Or Guaranteed [Member]
          
Components of other assets [Line Items]          
Foreclosed assets 2,114   2,114   2,514
Core deposit intangibles [Member]
          
Components of other assets [Line Items]          
Customer relationship and other amortized intangibles 5,294   5,294   5,915
Customer Relationships And Other [Member]
          
Components of other assets [Line Items]          
Customer relationship and other amortized intangibles 1,217   1,217   1,352
Federal Bank Stock [Member]
          
Components of other assets [Line Items]          
Cost method investments 4,100   4,100   4,227
Private Equity Investments Cost Method [Member]
          
Components of other assets [Line Items]          
Cost method investments 2,419   2,419   2,572
Low Income Housing Tax Credit Equity Method Investments [Member]
          
Components of other assets [Line Items]          
Equity method investments 4,931   4,931   4,767
Private Equity and Other Investments [Member]
          
Components of other assets [Line Items]          
Equity method investments $ 5,741   $ 5,741   $ 6,156