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Loans and Allowance for Credit Losses Textual (Details) (USD $)
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3 Months Ended | 12 Months Ended | 3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2008
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Mar. 31, 2012
Purchased Credit-Impaired Loans [Member]
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Dec. 31, 2011
Purchased Credit-Impaired Loans [Member]
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Mar. 31, 2011
Purchased Credit-Impaired Loans [Member]
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Mar. 31, 2012
Trial modifications [Member]
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Dec. 31, 2011
Trial modifications [Member]
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Mar. 31, 2012
Trial modifications [Member]
Home Affordable Modification Program [Member]
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Dec. 31, 2011
Trial modifications [Member]
Home Affordable Modification Program [Member]
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Mar. 31, 2012
Trial modifications [Member]
Second Lien Modification Program [Member]
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Dec. 31, 2011
Trial modifications [Member]
Second Lien Modification Program [Member]
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Mar. 31, 2012
Trial modifications [Member]
Proprietary Program [Member]
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Dec. 31, 2011
Trial modifications [Member]
Proprietary Program [Member]
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Mar. 31, 2012
Trial modifications [Member]
Financing Receivable Accruing [Member]
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Dec. 31, 2011
Trial modifications [Member]
Financing Receivable Accruing [Member]
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Mar. 31, 2012
Trial modifications [Member]
Financing Receivable Nonaccruing [Member]
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Dec. 31, 2011
Trial modifications [Member]
Financing Receivable Nonaccruing [Member]
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Mar. 31, 2012
Commercial and Industrial Loans [Member]
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Dec. 31, 2011
Commercial and Industrial Loans [Member]
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Dec. 31, 2011
Commercial and Industrial Loans [Member]
Financing Receivable, fully charged off, no recorded investment [Member]
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Mar. 31, 2012
Commercial and Industrial Loans [Member]
Purchased Credit-Impaired Loans [Member]
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Dec. 31, 2011
Commercial and Industrial Loans [Member]
Purchased Credit-Impaired Loans [Member]
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Mar. 31, 2012
Commercial Real Estate Mortgage [Member]
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Dec. 31, 2011
Commercial Real Estate Mortgage [Member]
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Dec. 31, 2011
Commercial Real Estate Mortgage [Member]
Financing Receivable, fully charged off, no recorded investment [Member]
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Mar. 31, 2012
Commercial Real Estate Mortgage [Member]
Purchased Credit-Impaired Loans [Member]
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Dec. 31, 2011
Commercial Real Estate Mortgage [Member]
Purchased Credit-Impaired Loans [Member]
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Mar. 31, 2012
Commercial Real Estate Construction [Member]
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Dec. 31, 2011
Commercial Real Estate Construction [Member]
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Dec. 31, 2011
Commercial Real Estate Construction [Member]
Financing Receivable, fully charged off, no recorded investment [Member]
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Mar. 31, 2012
Commercial Real Estate Construction [Member]
Purchased Credit-Impaired Loans [Member]
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Dec. 31, 2011
Commercial Real Estate Construction [Member]
Purchased Credit-Impaired Loans [Member]
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Mar. 31, 2012
Commercial Real Estate Mortgage and Construction Loans [Member]
Criticized [Member]
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Dec. 31, 2011
Lease Financing and Foreign [Member]
Financing Receivable, fully charged off, no recorded investment [Member]
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Mar. 31, 2012
Total Commercial [Member]
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Dec. 31, 2011
Total Commercial [Member]
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Dec. 31, 2008
Total Commercial [Member]
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Mar. 31, 2012
Total Commercial [Member]
Loans held for sale [Member]
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Dec. 31, 2011
Total Commercial [Member]
Loans held for sale [Member]
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Dec. 31, 2011
Total Commercial [Member]
Financing Receivable, fully charged off, no recorded investment [Member]
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Mar. 31, 2012
Total Commercial [Member]
Purchased Credit-Impaired Loans [Member]
|
Dec. 31, 2011
Total Commercial [Member]
Purchased Credit-Impaired Loans [Member]
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Mar. 31, 2012
Total Consumer [Member]
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Dec. 31, 2011
Total Consumer [Member]
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Mar. 31, 2012
Total Consumer [Member]
Financing Receivable Accruing [Member]
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Dec. 31, 2011
Total Consumer [Member]
Financing Receivable Accruing [Member]
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Mar. 31, 2012
Real estate 1-4 family first mortgage [Member]
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Dec. 31, 2011
Real estate 1-4 family first mortgage [Member]
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Mar. 31, 2012
Real estate 1-4 family first mortgage [Member]
Mortgages held for sale [Member]
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Dec. 31, 2011
Real estate 1-4 family first mortgage [Member]
Mortgages held for sale [Member]
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Mar. 31, 2012
Real estate 1-4 family junior lien mortgage [Member]
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Dec. 31, 2011
Real estate 1-4 family junior lien mortgage [Member]
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Mar. 31, 2012
Real estate 1-4 family junior lien mortgage [Member]
Implementation of Interagency Guidance, Effect [Member]
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Mar. 31, 2012
FHA Insured/VA Guaranteed [Member]
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Mar. 31, 2011
FHA Insured/VA Guaranteed [Member]
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Dec. 31, 2011
FHA Insured/VA Guaranteed [Member]
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Mar. 31, 2012
FHA Insured/VA Guaranteed [Member]
Financing Receivable, 90 Days or More Past Due [Member]
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Dec. 31, 2011
FHA Insured/VA Guaranteed [Member]
Financing Receivable, 90 Days or More Past Due [Member]
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Mar. 31, 2012
FHA Insured, VA Or FFELP Guaranteed [Member]
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Dec. 31, 2011
FHA Insured, VA Or FFELP Guaranteed [Member]
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| Accounts Notes Loans And Financing Receivable (Textual) [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Unearned income, net deferred loan fees and unamortized discount and premium | $ 8,900,000,000 | $ 9,300,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financing Receivable, certain purchases net of certain transfers to held for sale | 3,500,000,000 | 2,200,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Allowance for loan losses and credit losses, PCI loans | 245,000,000 | 231,000,000 | 0 | 257,000,000 | 177,000,000 | 165,000,000 | 0 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Loans, excluding Purchased Credit Impaired Loans | 28,000,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Government insured/guaranteed loans | 19,000,000,000 | 18,500,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financing Receivable, Recorded Investment, equal to or greater than 90 days past due | 10,800,000,000 | 11,500,000,000 | 1,200,000,000 | 1,500,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financing Receivables equal to or greater than 180 days past due, Percentage of Portfolio | 3.30% | 3.30% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financing Receivable, Recorded Investment, nonaccrual status | 22,026,000,000 | 21,304,000,000 | 1,726,000,000 | 2,142,000,000 | 4,081,000,000 | 4,085,000,000 | 1,709,000,000 | 1,890,000,000 | 5,800,000,000 | 7,599,000,000 | 8,217,000,000 | 9,000,000 | 25,000,000 | 14,427,000,000 | 13,087,000,000 | 10,683,000,000 | 10,913,000,000 | 287,000,000 | 301,000,000 | 3,558,000,000 | 1,975,000,000 | 1,700,000,000 | |||||||||||||||||||||||||||||||||||||||
| 90 days past due but still accruing | 22,555,000,000 | 22,569,000,000 | 7,100,000,000 | 8,700,000,000 | 104,000,000 | 153,000,000 | 27,000,000 | 18,000,000 | 289,000,000 | 256,000,000 | 283,000,000 | 225,000,000 | 25,000,000 | 89,000,000 | 459,000,000 | 467,000,000 | 425,000,000 | 504,000,000 | 900,000,000 | 885,000,000 | 19,681,000,000 | 19,240,000,000 | 20,900,000,000 | 20,500,000,000 | |||||||||||||||||||||||||||||||||||||
| Financing Receivable, reclassification from 90 days past due to nonaccrual | 43,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Impaired loans, Recorded Investment | 27,687,000,000 | 28,010,000,000 | 723,000,000 | 651,000,000 | 391,000,000 | 421,000,000 | 46,000,000 | 46,000,000 | 286,000,000 | 184,000,000 | 339,000,000 | 310,000,000 | 384,000,000 | 341,000,000 | 2,759,000,000 | 3,072,000,000 | 5,154,000,000 | 5,114,000,000 | 2,111,000,000 | 2,281,000,000 | 10,113,000,000 | 10,566,000,000 | 17,574,000,000 | 17,444,000,000 | 14,602,000,000 | 14,486,000,000 | 2,093,000,000 | 2,079,000,000 | |||||||||||||||||||||||||||||||||
| Unpaid principal balance | 33,481,000,000 | 39,332,000,000 | 4,224,000,000 | 7,191,000,000 | 2,500,000,000 | 6,404,000,000 | 7,490,000,000 | 1,100,000,000 | 2,875,000,000 | 4,733,000,000 | 1,800,000,000 | 157,000,000 | 13,654,000,000 | 19,726,000,000 | 5,600,000,000 | 19,827,000,000 | 19,606,000,000 | 16,703,000,000 | 16,494,000,000 | 2,243,000,000 | 2,232,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Total unfunded loan commitments on troubled debt restructurings | 449,000,000 | 3,800,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Financing Receivable Modifications, principal forgiven | $ 92,000,000 | $ 128,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||