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, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance $ 19,668 $ 23,463 $ 25,031 $ 21,711 $ 5,518
Provision for credit losses 7,217 7,899 15,753 21,668 15,979
Interest income on certain impaired loans (315) (332) (266) 0 0
Loan charge-offs (10,973) (13,615) (20,100) (19,825) (8,777)
Loan recoveries 1,939 2,316 2,347 1,657 938
Net loan charge-offs (9,034) (11,299) (17,753) (18,168) (7,839)
Allowances related to business combinations/other (59) (63) 698 (180) 8,053
Allowance for credit losses, ending balance 17,477 19,668 23,463 25,031 21,711
Components: Allowance for loan losses 17,060 19,372 23,022 24,516 21,013
Components: Allowance for unfunded credit commitments 417 296 441 515 698
Components: Allowance for credit losses 17,477 19,668 23,463 25,031 21,711
Net loan charge-offs as a percentage of average total loans 1.17% 1.49% 2.30% 2.21% 1.97%
Allowance for loan losses as a percentage of total loans 2.13% 2.52% 3.04% 3.13% 2.43%
Allowance for credit losses as a percentage of total loans 2.19% 2.56% 3.10% 3.20% 2.51%
Commercial and Industrial Loans [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (1,306) (1,598) (2,775) (3,365) (1,653)
Loan recoveries 461 419 427 254 114
Commercial Real Estate Mortgage [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (382) (636) (1,151) (670) (29)
Loan recoveries 163 143 68 33 5
Commercial Real Estate Construction [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (191) (351) (1,189) (1,063) (178)
Loan recoveries 124 146 110 16 3
Lease Financing [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (24) (38) (120) (229) (65)
Loan recoveries 19 24 20 20 13
Foreign Loans [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (111) (173) (198) (237) (245)
Loan recoveries 32 45 53 40 49
Total Commercial [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 6,358 8,169      
Provision for credit losses 666 365      
Interest income on certain impaired loans (95) (161)      
Loan charge-offs (2,014) (2,796) (5,433) (5,564) (2,170)
Loan recoveries 799 777 678 363 184
Net loan charge-offs (1,215) (2,019)      
Allowances related to business combinations/other 0 4      
Allowance for credit losses, ending balance 5,714 6,358 8,169    
Components: Allowance for credit losses 5,714 6,358 8,169    
Real estate 1-4 family first mortgage [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (3,013) (3,883) (4,900) (3,318) (540)
Loan recoveries 157 405 522 185 37
Real estate 1-4 family junior lien mortgage [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (3,437) (3,763) (4,934) (4,812) (2,204)
Loan recoveries 259 218 211 174 89
Credit Card [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (1,101) (1,449) (2,396) (2,708) (1,563)
Loan recoveries 185 251 218 180 147
Other revolving credit and installment [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Loan charge-offs (1,408) (1,724) (2,437) (3,423) (2,300)
Loan recoveries 539 665 718 755 481
Total Consumer [Member]
          
Financing Receivable, Allowance for Credit Losses [Roll Forward]          
Allowance for credit losses, beginning balance 13,310 15,294      
Provision for credit losses 6,551 7,534      
Interest income on certain impaired loans (220) (171)      
Loan charge-offs (8,959) (10,819) (14,667) (14,261) (6,607)
Loan recoveries 1,140 1,539 1,669 1,294 754
Net loan charge-offs (7,819) (9,280)      
Allowances related to business combinations/other (59) (67)      
Allowance for credit losses, ending balance 11,763 13,310 15,294    
Components: Allowance for credit losses $ 11,763 $ 13,310 $ 15,294