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Securitizations and Other Variable Interest Entities - CDO Vehicle (Details) (USD $)
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Sep. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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| On Balance Sheet Assets [Abstract] | |||
| Derivative assets | $ 57,865,000,000 | $ 73,023,000,000 | |
| AFS Debt Securities | 305,949,000,000 | 276,151,000,000 | |
| Other Assets | 150,698,000,000 | 145,686,000,000 | |
| Total assets | 2,166,162,000,000 | 2,129,046,000,000 | 2,219,628,000,000 |
| On Balance Sheet Liabilities [Abstract] | |||
| Derivative Liabilities | 51,369,000,000 | 59,520,000,000 | |
| Long-term debt | 286,534,000,000 | 372,265,000,000 | |
| Total liabilities | 1,927,556,000,000 | 1,898,945,000,000 | |
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Collateralized Debt Obligations [Member]
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| Variable Interest Entity [Line Items] | |||
| Maximum loss exposure | 3,775,000,000 | 3,967,000,000 | |
| On Balance Sheet Assets [Abstract] | |||
| Trading account assets | 2,337,000,000 | 1,853,000,000 | |
| Derivative assets | 567,000,000 | 1,130,000,000 | |
| Other Assets | 79,000,000 | 96,000,000 | |
| Total assets | 2,983,000,000 | 3,079,000,000 | |
| On Balance Sheet Liabilities [Abstract] | |||
| Derivative Liabilities | 7,000,000 | 11,000,000 | |
| Long-term debt | 2,841,000,000 | 2,714,000,000 | |
| Total liabilities | 2,848,000,000 | 2,725,000,000 | |
| Total assets of VIEs | 29,860,000,000 | 34,747,000,000 | |
| In Text Details [Abstract] | |||
| Notional Amount Of Liquidity Exposure | 1,600,000,000 | ||
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Consolidated VIEs [Member]
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| On Balance Sheet Assets [Abstract] | |||
| Derivative assets | 546,000,000 | 1,634,000,000 | |
| Other Assets | 3,754,000,000 | 4,769,000,000 | |
| Total assets | 137,656,000,000 | 151,761,000,000 | |
| On Balance Sheet Liabilities [Abstract] | |||
| Long-term debt | 38,055,000,000 | 49,054,000,000 | |
| Total liabilities | 42,552,000,000 | 55,947,000,000 | |
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Consolidated VIEs [Member] | Collateralized Debt Obligations [Member]
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| Variable Interest Entity [Line Items] | |||
| Maximum loss exposure | 2,212,000,000 | 1,695,000,000 | |
| On Balance Sheet Assets [Abstract] | |||
| Trading account assets | 2,025,000,000 | 1,392,000,000 | |
| Derivative assets | 187,000,000 | 452,000,000 | |
| Other Assets | 0 | 0 | |
| Total assets | 2,212,000,000 | 1,844,000,000 | |
| On Balance Sheet Liabilities [Abstract] | |||
| Derivative Liabilities | 0 | 0 | |
| Long-term debt | 2,839,000,000 | 2,712,000,000 | |
| Total liabilities | 2,839,000,000 | 2,712,000,000 | |
| Consolidated, Total assets of VIEs | 2,212,000,000 | 1,844,000,000 | |
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Unconsolidated VIEs [Member] | Collateralized Debt Obligations [Member]
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| Variable Interest Entity [Line Items] | |||
| Maximum loss exposure | 1,563,000,000 | 2,272,000,000 | |
| On Balance Sheet Assets [Abstract] | |||
| Trading account assets | 312,000,000 | 461,000,000 | |
| Derivative assets | 380,000,000 | 678,000,000 | |
| Other Assets | 79,000,000 | 96,000,000 | |
| Total assets | 771,000,000 | 1,235,000,000 | |
| On Balance Sheet Liabilities [Abstract] | |||
| Derivative Liabilities | 7,000,000 | 11,000,000 | |
| Long-term debt | 2,000,000 | 2,000,000 | |
| Total liabilities | 9,000,000 | 13,000,000 | |
| Unconsolidated, Total assets of VIEs | 27,648,000,000 | 32,903,000,000 | |
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Super Senior Collateralized Debt Obligation [Member] | Collateralized Debt Obligations [Member]
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| Variable Interest Entity [Line Items] | |||
| Maximum loss exposure | 187,000,000 | ||
| In Text Details [Abstract] | |||
| Notional Amount Of Liquidity Exposure | 116,000,000 | ||
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Collateralized Debt Obligation Financing Facilities [Member] | Collateralized Debt Obligations [Member]
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| Variable Interest Entity [Line Items] | |||
| Maximum loss exposure | 2,200,000,000 | ||
| In Text Details [Abstract] | |||
| C D O Financing Facilities Long Term Debt | 2,800,000,000 | ||
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Non-Super Senior Collateralized Debt Obligation [Member] | Collateralized Debt Obligations [Member]
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| Variable Interest Entity [Line Items] | |||
| Maximum loss exposure | 1,400,000,000 | ||
| In Text Details [Abstract] | |||
| Notional Amount Of Liquidity Exposure | $ 1,500,000,000 |