v2.4.0.6
Loans and Allowance for Credit Losses, Allowance for Credit Losses (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
Components: Allowance for loan losses 19,372 23,022 24,516 21,013 5,307
Components: Reserve for unfunded credit commitments 296 441 515 698 211
Components: Allowance for credit losses 19,668 23,463 25,031 21,711 5,518
Net loan charge-offs as a percentage of average total loans 1.49% 2.30% 2.21% 1.97% 1.03%
Allowance for loan losses as a percentage of total loans 2.52% 3.04% 3.13% 2.43% 1.39%
Allowance for credit losses as a percentage of total loans 2.56% 3.10% 3.20% 2.51% 1.44%
Commercial and Industrial Loans [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (1,598) (2,775) (3,365) (1,653) (629)
Loan recoveries 419 427 254 114 119
Commercial Real Estate Mortgage [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (636) (1,151) (670) (29) (6)
Loan recoveries 143 68 33 5 8
Commercial Real Estate Construction [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (351) (1,189) (1,063) (178) (14)
Loan recoveries 146 110 16 3 2
Lease Financing [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (38) (120) (229) (65) (33)
Loan recoveries 24 20 20 13 17
Foreign Loans [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (173) (198) (237) (245) (265)
Loan recoveries 45 53 40 49 65
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    
Components: Allowance for credit losses 6,358 8,169 8,141    
Real estate 1-4 family first mortgage [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (3,883) (4,900) (3,318) (540) (109)
Loan recoveries 405 522 185 37 22
Real estate 1-4 family junior lien mortgage [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (3,763) (4,934) (4,812) (2,204) (648)
Loan recoveries 218 211 174 89 53
Credit Card [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (1,449) (2,396) (2,708) (1,563) (832)
Loan recoveries 251 218 180 147 120
Other revolving credit and installment [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (1,724) (2,437) (3,423) (2,300) (1,913)
Loan recoveries 665 718 755 481 504
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    
Components: Allowance for credit losses $ 13,310 $ 15,294 $ 16,890