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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, 2013
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Mar. 31, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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| Variable Interest Entity [Line Items] | ||||||||
| Collection reinvested in revolving period securitizations | $ 0 | $ 0 | ||||||
| On Balance Sheet Assets [Abstract] | ||||||||
| Loans and leases | 911,592,000,000 | 907,819,000,000 | ||||||
| Allowance for loan and lease losses | (22,441,000,000) | (32,211,000,000) | (24,179,000,000) | (33,783,000,000) | ||||
| Total assets | 2,174,819,000,000 | 2,181,449,000,000 | 2,209,974,000,000 | |||||
| On Balance Sheet Liabilities [Abstract] | ||||||||
| Long-term debt | 279,641,000,000 | 275,585,000,000 | ||||||
| Total liabilities | 1,937,526,000,000 | 1,973,018,000,000 | ||||||
| In Text Details [Abstract] | ||||||||
| Remaining Borrowing Capacity On Home Equity Line | 111,000,000 | 196,000,000 | ||||||
| Repurchase of loans from home equity securitization trusts | 39,000,000 | 0 | ||||||
| Total assets of home equity securitization trusts transferred | 475,000,000 | |||||||
| Total liabilities of home equity securitization trusts transferred | (616,000,000) | |||||||
| Gains related to deconsolidation of home equity securitization trusts | 141,000,000 | |||||||
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Consolidated VIEs [Member]
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| On Balance Sheet Assets [Abstract] | ||||||||
| Loans and leases | 116,236,000,000 | 123,227,000,000 | ||||||
| Allowance for loan and lease losses | (3,310,000,000) | (3,658,000,000) | ||||||
| Total assets | 130,183,000,000 | 134,431,000,000 | ||||||
| On Balance Sheet Liabilities [Abstract] | ||||||||
| Long-term debt | 31,461,000,000 | 34,256,000,000 | ||||||
| Other Liabilities | 345,000,000 | 360,000,000 | ||||||
| Total liabilities | 34,345,000,000 | 38,347,000,000 | ||||||
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Home Equity [Member]
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| Variable Interest Entity [Line Items] | ||||||||
| Maximum loss exposure | 8,453,000,000 | 8,711,000,000 | ||||||
| On Balance Sheet Assets [Abstract] | ||||||||
| Trading account assets | 8,000,000 | 8,000,000 | ||||||
| AFS Debt Securities | 15,000,000 | 14,000,000 | ||||||
| Loans and leases | 1,566,000,000 | 2,197,000,000 | ||||||
| Allowance for loan and lease losses | 117,000,000 | 193,000,000 | ||||||
| Total assets | 1,472,000,000 | 2,026,000,000 | ||||||
| On Balance Sheet Liabilities [Abstract] | ||||||||
| Long-term debt | 1,649,000,000 | 2,331,000,000 | ||||||
| Other Liabilities | 85,000,000 | 92,000,000 | ||||||
| Total liabilities | 1,734,000,000 | 2,423,000,000 | ||||||
| Principal balance outstanding | 12,498,000,000 | 14,841,000,000 | ||||||
| In Text Details [Abstract] | ||||||||
| Trust certificates outstanding | 8,700,000,000 | 9,000,000,000 | ||||||
| Reserve For Losses For Home Equity Securitizations | 48,000,000 | 51,000,000 | ||||||
| Servicing Fees, Net | 13,000,000 | 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 | 1,449,000,000 | [1] | 2,004,000,000 | [1] | ||||
| On Balance Sheet Assets [Abstract] | ||||||||
| Trading account assets | 0 | 0 | ||||||
| AFS Debt Securities | 0 | 0 | ||||||
| Loans and leases | 1,566,000,000 | 2,197,000,000 | ||||||
| Allowance for loan and lease losses | (117,000,000) | (193,000,000) | ||||||
| Total assets | 1,449,000,000 | 2,004,000,000 | ||||||
| On Balance Sheet Liabilities [Abstract] | ||||||||
| Long-term debt | 1,649,000,000 | 2,331,000,000 | ||||||
| Other Liabilities | 85,000,000 | 92,000,000 | ||||||
| Total liabilities | 1,734,000,000 | 2,423,000,000 | ||||||
| Principal balance outstanding | 1,566,000,000 | 2,197,000,000 | ||||||
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Home Equity [Member] | Unconsolidated VIEs [Member]
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| Variable Interest Entity [Line Items] | ||||||||
| Maximum loss exposure | 7,004,000,000 | [1] | 6,707,000,000 | [1] | ||||
| On Balance Sheet Assets [Abstract] | ||||||||
| Trading account assets | 8,000,000 | 8,000,000 | ||||||
| AFS Debt Securities | 15,000,000 | 14,000,000 | ||||||
| Loans and leases | 0 | 0 | ||||||
| Allowance for loan and lease losses | 0 | 0 | ||||||
| Total assets | 23,000,000 | 22,000,000 | ||||||
| On Balance Sheet Liabilities [Abstract] | ||||||||
| Long-term debt | 0 | 0 | ||||||
| Other Liabilities | 0 | 0 | ||||||
| Total liabilities | 0 | 0 | ||||||
| Principal balance outstanding | $ 10,932,000,000 | $ 12,644,000,000 | ||||||
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