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Securitizations and Other Variable Interest Entities - CDO Vehicle (Details) (USD $)
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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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| On Balance Sheet Assets [Abstract] | ||||||
| Derivative assets | $ 59,051,000,000 | $ 73,023,000,000 | ||||
| AFS Debt Securities | 297,040,000,000 | 276,151,000,000 | ||||
| Other Assets | 150,410,000,000 | 145,686,000,000 | ||||
| Total assets | 2,181,449,000,000 | 2,129,046,000,000 | 2,274,532,000,000 | [1] | ||
| On Balance Sheet Liabilities [Abstract] | ||||||
| Derivative Liabilities | 49,172,000,000 | 59,520,000,000 | ||||
| Long-term debt | 354,912,000,000 | 372,265,000,000 | ||||
| Total liabilities | 1,948,950,000,000 | 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 | 4,258,000,000 | 3,967,000,000 | ||||
| On Balance Sheet Assets [Abstract] | ||||||
| Trading account assets | 2,388,000,000 | 1,853,000,000 | ||||
| Derivative assets | 805,000,000 | 1,130,000,000 | ||||
| Other Assets | 89,000,000 | 96,000,000 | ||||
| Total assets | 3,282,000,000 | 3,079,000,000 | ||||
| On Balance Sheet Liabilities [Abstract] | ||||||
| Derivative Liabilities | 14,000,000 | 11,000,000 | ||||
| Long-term debt | 2,885,000,000 | 2,714,000,000 | ||||
| Total liabilities | 2,899,000,000 | 2,725,000,000 | ||||
| Total assets of VIEs | 32,577,000,000 | 34,747,000,000 | ||||
| In Text Details [Abstract] | ||||||
| Notional Amount Of Liquidity Exposure | 2,200,000,000 | |||||
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Consolidated VIEs [Member]
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| On Balance Sheet Assets [Abstract] | ||||||
| Derivative assets | 1,109,000,000 | 1,634,000,000 | ||||
| Other Assets | 3,118,000,000 | 4,769,000,000 | ||||
| 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 | ||||
| Total liabilities | 50,843,000,000 | 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 | 2,249,000,000 | 1,695,000,000 | ||||
| On Balance Sheet Assets [Abstract] | ||||||
| Trading account assets | 1,975,000,000 | 1,392,000,000 | ||||
| Derivative assets | 274,000,000 | 452,000,000 | ||||
| Other Assets | 0 | 0 | ||||
| Total assets | 2,249,000,000 | 1,844,000,000 | ||||
| On Balance Sheet Liabilities [Abstract] | ||||||
| Derivative Liabilities | 0 | 0 | ||||
| Long-term debt | 2,883,000,000 | 2,712,000,000 | ||||
| Total liabilities | 2,883,000,000 | 2,712,000,000 | ||||
| Consolidated, Total assets of VIEs | 2,249,000,000 | 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 | 2,009,000,000 | 2,272,000,000 | ||||
| On Balance Sheet Assets [Abstract] | ||||||
| Trading account assets | 413,000,000 | 461,000,000 | ||||
| Derivative assets | 531,000,000 | 678,000,000 | ||||
| Other Assets | 89,000,000 | 96,000,000 | ||||
| Total assets | 1,033,000,000 | 1,235,000,000 | ||||
| On Balance Sheet Liabilities [Abstract] | ||||||
| Derivative Liabilities | 14,000,000 | 11,000,000 | ||||
| Long-term debt | 2,000,000 | 2,000,000 | ||||
| Total liabilities | 16,000,000 | 13,000,000 | ||||
| Unconsolidated, Total assets of VIEs | 30,328,000,000 | 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 | 305,000,000 | |||||
| In Text Details [Abstract] | ||||||
| Notional Amount Of Liquidity Exposure | 557,000,000 | |||||
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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 | 2,100,000,000 | |||||
| In Text Details [Abstract] | ||||||
| C D O Financing Facilities Long Term Debt | 2,900,000,000 | |||||
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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 | 1,900,000,000 | |||||
| In Text Details [Abstract] | ||||||
| Notional Amount Of Liquidity Exposure | $ 1,700,000,000 | |||||
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