v2.4.0.6
Loans and Allowance for Credit Losses, Allowance for Credit Losses by Category (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance $ 23,463 $ 25,031 $ 21,711 $ 5,518 $ 3,964
Provision for credit losses 7,899 15,753 21,668 15,979 4,939
Interest income on certain impaired loans (1) (332) (266) 0 0 0
Loan charge-offs (13,615) (20,100) (19,825) (8,777) (4,449)
Loan recoveries 2,316 2,347 1,657 938 910
Net loan charge-offs (11,299) (17,753) (18,168) (7,839) (3,539)
Allowances related to business combinations/other (63) 698 (180) 8,053 154
Allowance for credit losses, ending balance 19,668 23,463 25,031 21,711 5,518
Total Commercial [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 8,169 8,141      
Provision for credit losses 365 4,913      
Interest income on certain impaired loans (1) (161) (139)      
Loan charge-offs (2,796) (5,433) (5,564) (2,170) (947)
Loan recoveries 777 678 363 184 211
Net loan charge-offs (2,019) (4,755)      
Allowances related to business combinations/other 4 9      
Allowance for credit losses, ending balance 6,358 8,169 8,141    
Total Consumer [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 15,294 16,890      
Provision for credit losses 7,534 10,840      
Interest income on certain impaired loans (1) (171) (127)      
Loan charge-offs (10,819) (14,667) (14,261) (6,607) (3,502)
Loan recoveries 1,539 1,669 1,294 754 699
Net loan charge-offs (9,280) (12,998)      
Allowances related to business combinations/other (67) 689      
Allowance for credit losses, ending balance $ 13,310 $ 15,294 $ 16,890