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Securitizations and Other Variable Interest Entities - Home Equity Loans (Details) (USD $)
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12 Months Ended | |||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| On Balance Sheet Assets [Abstract] | ||||||||||
| Debt securities carried at fair value | $ 268,795,000,000 | $ 310,850,000,000 | ||||||||
| Loans and leases | 928,233,000,000 | 907,819,000,000 | ||||||||
| Allowance for loan and lease losses | (17,428,000,000) | (24,179,000,000) | (33,783,000,000) | (41,885,000,000) | ||||||
| All other assets | 124,090,000,000 | 150,112,000,000 | ||||||||
| Total assets | 2,102,273,000,000 | [1] | 2,209,974,000,000 | [1] | ||||||
| On Balance Sheet Liabilities [Abstract] | ||||||||||
| Long-term debt | 249,674,000,000 | 275,585,000,000 | ||||||||
| Total liabilities | 1,869,588,000,000 | 1,973,018,000,000 | ||||||||
| In Text Details [Abstract] | ||||||||||
| Remaining Borrowing Capacity On Home Equity Line | 82,000,000 | 196,000,000 | ||||||||
| Repurchase of loans from home equity securitization trusts | 287,000,000 | 87,000,000 | ||||||||
| Total assets of home equity securitization trusts transferred | 475,000,000 | |||||||||
| Total liabilities of home equity securitization trusts transferred | 616,000,000 | |||||||||
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Consolidated VIEs [Member]
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| On Balance Sheet Assets [Abstract] | ||||||||||
| Loans and leases | 109,118,000,000 | 123,227,000,000 | ||||||||
| Allowance for loan and lease losses | (2,674,000,000) | (3,658,000,000) | ||||||||
| All other assets | 4,577,000,000 | 4,654,000,000 | ||||||||
| Total assets | 121,002,000,000 | 134,431,000,000 | ||||||||
| On Balance Sheet Liabilities [Abstract] | ||||||||||
| Long-term debt | 19,448,000,000 | 34,256,000,000 | ||||||||
| All other liabilities | 253,000,000 | 360,000,000 | ||||||||
| Total liabilities | 20,851,000,000 | 38,347,000,000 | ||||||||
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Home Equity Line of Credit [Member]
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| Variable Interest Entity [Line Items] | ||||||||||
| Maximum loss exposure | 7,486,000,000 | [2] | 8,711,000,000 | [2] | ||||||
| On Balance Sheet Assets [Abstract] | ||||||||||
| Trading account assets | 12,000,000 | 8,000,000 | ||||||||
| Debt securities carried at fair value | 25,000,000 | 14,000,000 | ||||||||
| Loans and leases | 1,329,000,000 | 2,197,000,000 | ||||||||
| Allowance for loan and lease losses | (80,000,000) | (193,000,000) | ||||||||
| All other assets | 20,000,000 | 0 | ||||||||
| Total assets | 1,306,000,000 | 2,026,000,000 | ||||||||
| On Balance Sheet Liabilities [Abstract] | ||||||||||
| Long-term debt | 1,450,000,000 | 2,331,000,000 | ||||||||
| All other liabilities | 90,000,000 | 92,000,000 | ||||||||
| Total liabilities | 1,540,000,000 | 2,423,000,000 | ||||||||
| Principal balance outstanding | 8,871,000,000 | 14,841,000,000 | ||||||||
| In Text Details [Abstract] | ||||||||||
| Trust certificates outstanding | 7,600,000,000 | 9,000,000,000 | ||||||||
| Reserve For Losses For Home Equity Securitizations | 12,000,000 | 51,000,000 | ||||||||
| Servicing Fees, Net | 47,000,000 | 59,000,000 | ||||||||
| Gains (losses) related to deconsolidation of home equity securitization trusts | 141,000,000 | |||||||||
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Home Equity Line of Credit [Member] | Consolidated VIEs [Member]
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| Variable Interest Entity [Line Items] | ||||||||||
| Maximum loss exposure | 1,269,000,000 | [2] | 2,004,000,000 | [2] | ||||||
| On Balance Sheet Assets [Abstract] | ||||||||||
| Trading account assets | 0 | 0 | ||||||||
| Debt securities carried at fair value | 0 | 0 | ||||||||
| Loans and leases | 1,329,000,000 | 2,197,000,000 | ||||||||
| Allowance for loan and lease losses | (80,000,000) | (193,000,000) | ||||||||
| All other assets | 20,000,000 | 0 | ||||||||
| Total assets | 1,269,000,000 | 2,004,000,000 | ||||||||
| On Balance Sheet Liabilities [Abstract] | ||||||||||
| Long-term debt | 1,450,000,000 | 2,331,000,000 | ||||||||
| All other liabilities | 90,000,000 | 92,000,000 | ||||||||
| Total liabilities | 1,540,000,000 | 2,423,000,000 | ||||||||
| Principal balance outstanding | 1,329,000,000 | 2,197,000,000 | ||||||||
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Home Equity Line of Credit [Member] | Unconsolidated VIEs [Member]
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| Variable Interest Entity [Line Items] | ||||||||||
| Maximum loss exposure | 6,217,000,000 | [2] | 6,707,000,000 | [2] | ||||||
| On Balance Sheet Assets [Abstract] | ||||||||||
| Trading account assets | 12,000,000 | 8,000,000 | ||||||||
| Debt securities carried at fair value | 25,000,000 | 14,000,000 | ||||||||
| Loans and leases | 0 | 0 | ||||||||
| Allowance for loan and lease losses | 0 | 0 | ||||||||
| All other assets | 0 | 0 | ||||||||
| Total assets | 37,000,000 | 22,000,000 | ||||||||
| On Balance Sheet Liabilities [Abstract] | ||||||||||
| Long-term debt | 0 | 0 | ||||||||
| All other liabilities | 0 | 0 | ||||||||
| Total liabilities | 0 | 0 | ||||||||
| Principal balance outstanding | $ 7,542,000,000 | $ 12,644,000,000 | ||||||||
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