|
Loans and Allowance for Credit Losses, Loans by Credit Quality Indicator, Commercial (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2008
|
|---|---|---|---|
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Purchased Credit Impaired Loans | $ 29,729 | $ 30,968 | $ 58,797 |
| Loans | 799,966 | 799,574 | |
|
Total Commercial [Member]
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|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Purchased Credit Impaired Loans | 3,502 | 3,977 | 18,704 |
| Loans | 361,714 | 361,198 | |
|
Commercial and Industrial Loans [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Purchased Credit Impaired Loans | 191 | 259 | 4,580 |
| Loans | 185,623 | 187,759 | |
|
Commercial Real Estate Mortgage [Member]
|
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| Loans and Leases Receivable Disclosure [Abstract] | |||
| Purchased Credit Impaired Loans | 1,839 | 1,970 | 5,803 |
| Loans | 106,119 | 106,340 | |
|
Commercial Real Estate Construction [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Purchased Credit Impaired Loans | 767 | 877 | 6,462 |
| Loans | 16,650 | 16,904 | |
|
Lease Financing [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Purchased Credit Impaired Loans | 0 | 0 | |
| Loans | 12,402 | 12,424 | |
|
Foreign Loans [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Purchased Credit Impaired Loans | 705 | 871 | 1,859 |
| Loans | 40,920 | 37,771 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 358,212 | 357,221 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member] | Pass [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 319,902 | 315,867 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Total Commercial [Member] | Criticized [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 38,310 | 41,354 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 185,432 | 187,500 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member] | Pass [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 167,516 | 169,293 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial and Industrial Loans [Member] | Criticized [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 17,916 | 18,207 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Mortgage [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 104,280 | 104,370 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Mortgage [Member] | Pass [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 88,613 | 87,183 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Mortgage [Member] | Criticized [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 15,667 | 17,187 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 15,883 | 16,027 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member] | Pass [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 12,983 | 12,224 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Commercial Real Estate Construction [Member] | Criticized [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 2,900 | 3,803 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Lease Financing [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 12,402 | 12,424 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Lease Financing [Member] | Pass [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 11,776 | 11,787 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Lease Financing [Member] | Criticized [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 626 | 637 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Foreign Loans [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 40,215 | 36,900 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Foreign Loans [Member] | Pass [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | 39,014 | 35,380 | |
|
Loans Excluding Purchased Credit-Impaired Loans [Member] | Foreign Loans [Member] | Criticized [Member]
|
|||
| Loans and Leases Receivable Disclosure [Abstract] | |||
| Loans, excluding Purchased Credit Impaired Loans | $ 1,201 | $ 1,520 |