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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, 2014
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Mar. 31, 2013
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Dec. 31, 2013
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Dec. 31, 2012
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| On Balance Sheet Assets [Abstract] | |||||||||||
| Loans and leases | $ 916,217,000,000 | $ 928,233,000,000 | |||||||||
| Allowance for loan and lease losses | (16,618,000,000) | (22,441,000,000) | (17,428,000,000) | (24,179,000,000) | |||||||
| All other Assets | 121,821,000,000 | 124,090,000,000 | |||||||||
| Total assets | 2,149,851,000,000 | [1] | 2,174,819,000,000 | [1] | 2,102,273,000,000 | [1] | |||||
| On Balance Sheet Liabilities [Abstract] | |||||||||||
| Long-term debt | 254,785,000,000 | 249,674,000,000 | |||||||||
| Total liabilities | 1,917,963,000,000 | 1,869,588,000,000 | |||||||||
| In Text Details [Abstract] | |||||||||||
| Remaining Borrowing Capacity On Home Equity Line | 84,000,000 | 82,000,000 | |||||||||
| Repurchase of loans from home equity securitization trusts | 102,000,000 | 39,000,000 | |||||||||
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Consolidated VIEs [Member]
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| On Balance Sheet Assets [Abstract] | |||||||||||
| Loans and leases | 104,556,000,000 | 109,118,000,000 | |||||||||
| Allowance for loan and lease losses | (2,614,000,000) | (2,674,000,000) | |||||||||
| All other Assets | 3,970,000,000 | 4,577,000,000 | |||||||||
| Total assets | 115,281,000,000 | 121,002,000,000 | |||||||||
| On Balance Sheet Liabilities [Abstract] | |||||||||||
| Long-term debt | 18,338,000,000 | 19,448,000,000 | |||||||||
| All other Liabilities | 179,000,000 | 253,000,000 | |||||||||
| Total liabilities | 19,693,000,000 | 20,851,000,000 | |||||||||
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Home Equity Line of Credit [Member]
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| Variable Interest Entity [Line Items] | |||||||||||
| Maximum loss exposure | 7,248,000,000 | [2] | 7,486,000,000 | [2] | |||||||
| On Balance Sheet Assets [Abstract] | |||||||||||
| Trading account assets | 11,000,000 | 12,000,000 | |||||||||
| Debt securities carried at fair value | 26,000,000 | 25,000,000 | |||||||||
| Loans and leases | 1,275,000,000 | 1,329,000,000 | |||||||||
| Allowance for loan and lease losses | (75,000,000) | (80,000,000) | |||||||||
| All other Assets | 23,000,000 | 20,000,000 | |||||||||
| Total assets | 1,260,000,000 | 1,306,000,000 | |||||||||
| On Balance Sheet Liabilities [Abstract] | |||||||||||
| Long-term debt | 1,391,000,000 | 1,450,000,000 | |||||||||
| All other Liabilities | 91,000,000 | 90,000,000 | |||||||||
| Total liabilities | 1,482,000,000 | 1,540,000,000 | |||||||||
| Principal balance outstanding | 8,639,000,000 | 8,871,000,000 | |||||||||
| In Text Details [Abstract] | |||||||||||
| Trust certificates outstanding | 7,400,000,000 | 7,600,000,000 | |||||||||
| Reserve For Losses For Home Equity Securitizations | 12,000,000 | 12,000,000 | |||||||||
| Servicing Fees, Net | 9,000,000 | 13,000,000 | |||||||||
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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 | 1,223,000,000 | [2] | 1,269,000,000 | [2] | |||||||
| On Balance Sheet Assets [Abstract] | |||||||||||
| Trading account assets | 0 | 0 | |||||||||
| Debt securities carried at fair value | 0 | 0 | |||||||||
| Loans and leases | 1,275,000,000 | 1,329,000,000 | |||||||||
| Allowance for loan and lease losses | (75,000,000) | (80,000,000) | |||||||||
| All other Assets | 23,000,000 | 20,000,000 | |||||||||
| Total assets | 1,223,000,000 | 1,269,000,000 | |||||||||
| On Balance Sheet Liabilities [Abstract] | |||||||||||
| Long-term debt | 1,391,000,000 | 1,450,000,000 | |||||||||
| All other Liabilities | 91,000,000 | 90,000,000 | |||||||||
| Total liabilities | 1,482,000,000 | 1,540,000,000 | |||||||||
| Principal balance outstanding | 1,275,000,000 | 1,329,000,000 | |||||||||
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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 | 6,025,000,000 | [2] | 6,217,000,000 | [2] | |||||||
| On Balance Sheet Assets [Abstract] | |||||||||||
| Trading account assets | 11,000,000 | 12,000,000 | |||||||||
| Debt securities carried at fair value | 26,000,000 | 25,000,000 | |||||||||
| Loans and leases | 0 | 0 | |||||||||
| Allowance for loan and lease losses | 0 | 0 | |||||||||
| All other Assets | 0 | 0 | |||||||||
| Total assets | 37,000,000 | 37,000,000 | |||||||||
| On Balance Sheet Liabilities [Abstract] | |||||||||||
| Long-term debt | 0 | 0 | |||||||||
| All other Liabilities | 0 | 0 | |||||||||
| Total liabilities | 0 | 0 | |||||||||
| Principal balance outstanding | $ 7,364,000,000 | $ 7,542,000,000 | |||||||||
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