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Loans and Allowance for Credit Losses, PCI Loans Outstanding (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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|---|---|---|---|---|---|
| PCI loans [Abstract] | |||||
| Purchased Credit Impaired Loans (carrying value) | $ 30,968 | $ 36,719 | $ 41,430 | $ 51,705 | $ 58,797 |
| Total PCI loans (unpaid principal balance) | 45,174 | 55,312 | 64,331 | 83,615 | 98,182 |
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Commercial and Industrial Loans [Member]
|
|||||
| PCI loans [Abstract] | |||||
| Purchased Credit Impaired Loans (carrying value) | 259 | 399 | 718 | 1,911 | 4,580 |
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Commercial Real Estate Mortgage [Member]
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|||||
| PCI loans [Abstract] | |||||
| Purchased Credit Impaired Loans (carrying value) | 1,970 | 3,270 | 2,855 | 4,137 | 5,803 |
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Commercial Real Estate Construction [Member]
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|||||
| PCI loans [Abstract] | |||||
| Purchased Credit Impaired Loans (carrying value) | 877 | 1,745 | 2,949 | 5,207 | 6,462 |
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Foreign Loans [Member]
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|||||
| PCI loans [Abstract] | |||||
| Purchased Credit Impaired Loans (carrying value) | 871 | 1,353 | 1,413 | 1,733 | 1,859 |
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Total Commercial [Member]
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|||||
| PCI loans [Abstract] | |||||
| Purchased Credit Impaired Loans (carrying value) | 3,977 | 6,767 | 7,935 | 12,988 | 18,704 |
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Real estate 1-4 family first mortgage [Member]
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|||||
| PCI loans [Abstract] | |||||
| Purchased Credit Impaired Loans (carrying value) | 26,839 | 29,746 | 33,245 | 38,386 | 39,214 |
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Real estate 1-4 family junior lien mortgage [Member]
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|||||
| PCI loans [Abstract] | |||||
| Purchased Credit Impaired Loans (carrying value) | 152 | 206 | 250 | 331 | 728 |
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Other revolving credit and installment [Member]
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|||||
| PCI loans [Abstract] | |||||
| Purchased Credit Impaired Loans (carrying value) | 0 | 0 | 0 | 0 | 151 |
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Total Consumer [Member]
|
|||||
| PCI loans [Abstract] | |||||
| Purchased Credit Impaired Loans (carrying value) | $ 26,991 | $ 29,952 | $ 33,495 | $ 38,717 | $ 40,093 |