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Securitizations and Other Variable Interest Entities - Home Equity Loans (Details) (USD $)
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3 Months Ended | ||||||||||
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Mar. 31, 2012
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Dec. 31, 2011
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Mar. 31, 2011
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Dec. 31, 2010
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| Variable Interest Entity [Line Items] | |||||||||||
| Collection reinvested in revolving period securitizations | $ 0 | ||||||||||
| On Balance Sheet Assets [Abstract] | |||||||||||
| AFS Debt Securities | 297,040,000,000 | 276,151,000,000 | |||||||||
| Loans and leases | 902,294,000,000 | 926,200,000,000 | |||||||||
| Allowance for loan and lease losses | (32,211,000,000) | (33,783,000,000) | (39,843,000,000) | (41,885,000,000) | |||||||
| Total assets | 2,181,449,000,000 | 2,129,046,000,000 | 2,274,532,000,000 | [1] | |||||||
| On Balance Sheet Liabilities [Abstract] | |||||||||||
| Long-term debt | 354,912,000,000 | 372,265,000,000 | |||||||||
| Total liabilities | 1,948,950,000,000 | 1,898,945,000,000 | |||||||||
| In Text Details [Abstract] | |||||||||||
| Remaining Borrowing Capacity On Home Equity Line | 417,000,000 | 460,000,000 | |||||||||
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Consolidated VIEs [Member]
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| On Balance Sheet Assets [Abstract] | |||||||||||
| Loans and leases | 133,742,000,000 | 140,194,000,000 | |||||||||
| Allowance for loan and lease losses | (4,509,000,000) | (5,066,000,000) | |||||||||
| Total assets | 143,957,000,000 | 151,761,000,000 | |||||||||
| On Balance Sheet Liabilities [Abstract] | |||||||||||
| Long-term debt | 44,267,000,000 | 49,054,000,000 | |||||||||
| Other Liabilities | 978,000,000 | 1,116,000,000 | |||||||||
| Total liabilities | 50,843,000,000 | 55,947,000,000 | |||||||||
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Home Equity [Member]
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| Variable Interest Entity [Line Items] | |||||||||||
| Maximum loss exposure | 9,828,000,000 | [2] | 10,235,000,000 | [2] | |||||||
| On Balance Sheet Assets [Abstract] | |||||||||||
| Trading account assets | 5,000,000 | 5,000,000 | |||||||||
| AFS Debt Securities | 14,000,000 | 13,000,000 | |||||||||
| Loans and leases | 2,859,000,000 | 2,975,000,000 | |||||||||
| Allowance for loan and lease losses | (267,000,000) | (303,000,000) | |||||||||
| Total assets | 2,611,000,000 | 2,690,000,000 | |||||||||
| On Balance Sheet Liabilities [Abstract] | |||||||||||
| Long-term debt | 2,966,000,000 | 3,081,000,000 | |||||||||
| Other Liabilities | 76,000,000 | 66,000,000 | |||||||||
| Total liabilities | 3,042,000,000 | 3,147,000,000 | |||||||||
| Principal balance outstanding | 16,730,000,000 | 17,397,000,000 | |||||||||
| In Text Details [Abstract] | |||||||||||
| Trust certificates outstanding | 10,200,000,000 | 10,700,000,000 | |||||||||
| Reserve For Losses For Home Equity Securitizations | 63,000,000 | 69,000,000 | |||||||||
| Servicing Fees, Net | 17,000,000 | ||||||||||
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Home Equity [Member] | Consolidated VIEs [Member]
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| Variable Interest Entity [Line Items] | |||||||||||
| Maximum loss exposure | 2,592,000,000 | [2] | 2,672,000,000 | [2] | |||||||
| On Balance Sheet Assets [Abstract] | |||||||||||
| Trading account assets | 0 | 0 | |||||||||
| AFS Debt Securities | 0 | 0 | |||||||||
| Loans and leases | 2,859,000,000 | 2,975,000,000 | |||||||||
| Allowance for loan and lease losses | (267,000,000) | (303,000,000) | |||||||||
| Total assets | 2,592,000,000 | 2,672,000,000 | |||||||||
| On Balance Sheet Liabilities [Abstract] | |||||||||||
| Long-term debt | 2,966,000,000 | 3,081,000,000 | |||||||||
| Other Liabilities | 76,000,000 | 66,000,000 | |||||||||
| Total liabilities | 3,042,000,000 | 3,147,000,000 | |||||||||
| Principal balance outstanding | 2,859,000,000 | 2,975,000,000 | |||||||||
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Home Equity [Member] | Unconsolidated VIEs [Member]
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| Variable Interest Entity [Line Items] | |||||||||||
| Maximum loss exposure | 7,236,000,000 | [2] | 7,563,000,000 | [2] | |||||||
| On Balance Sheet Assets [Abstract] | |||||||||||
| Trading account assets | 5,000,000 | 5,000,000 | |||||||||
| AFS Debt Securities | 14,000,000 | 13,000,000 | |||||||||
| Loans and leases | 0 | 0 | |||||||||
| Allowance for loan and lease losses | 0 | 0 | |||||||||
| Total assets | 19,000,000 | 18,000,000 | |||||||||
| On Balance Sheet Liabilities [Abstract] | |||||||||||
| Long-term debt | 0 | 0 | |||||||||
| Other Liabilities | 0 | 0 | |||||||||
| Total liabilities | 0 | 0 | |||||||||
| Principal balance outstanding | $ 13,871,000,000 | $ 14,422,000,000 | |||||||||
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