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Securitizations and Other Variable Interest Entities - Real Estate and Other VIEs (Details) (USD $)
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12 Months Ended | |
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Dec. 31, 2012
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Dec. 31, 2011
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Derivative contracts | $ 24,851,000,000 | $ 35,091,000,000 |
| Investment securities | 5,903,000,000 | 6,684,000,000 |
| Other assets | 17,464,000,000 | 15,155,000,000 |
| Total Assets | 602,928,000,000 | 565,516,000,000 |
| Long-term borrowings | 92,249,000,000 | 106,929,000,000 |
| Other liabilities | 18,634,000,000 | 18,128,000,000 |
| Total Liabilities | 538,528,000,000 | 506,476,000,000 |
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Real Estate and Other Variable Risk Entities [Member]
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Maximum loss exposure | 2,473,000,000 | 6,452,000,000 |
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Real Estate and Other Variable Risk Entities [Member] | Consolidated VIE
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Maximum loss exposure | 215,000,000 | 1,821,000,000 |
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Real Estate and Other Variable Risk Entities [Member] | Unconsolidated VIEs
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Maximum loss exposure | 2,258,000,000 | 4,631,000,000 |
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Resecuritization Trusts [Member]
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Resecuritized securities | 45,600,000,000 | 13,500,000,000 |
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Other Asset Back Financing Arrangement [Member]
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Maximum loss exposure | 2,500,000,000 | 4,700,000,000 |
| Percentage of financing provided for asset backed financing arrangements | 75.00% | |
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Real Estate and Other Variable Risk Entities [Member]
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Long-term borrowings | 203,000,000 | 10,000,000 |
| Other liabilities | 12,000,000 | 450,000,000 |
| Total Liabilities | 215,000,000 | 460,000,000 |
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Real Estate and Other Variable Risk Entities [Member] | Consolidated VIE
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Long-term borrowings | 203,000,000 | 10,000,000 |
| Other liabilities | 11,000,000 | 185,000,000 |
| Total Liabilities | 214,000,000 | 195,000,000 |
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Real Estate and Other Variable Risk Entities [Member] | Unconsolidated VIEs
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Long-term borrowings | 0 | 0 |
| Other liabilities | 1,000,000 | 265,000,000 |
| Total Liabilities | 1,000,000 | 265,000,000 |
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Real Estate and Other Variable Risk Entities [Member]
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Trading assets | 1,625,000,000 | 2,980,000,000 |
| Derivative contracts | 460,000,000 | 440,000,000 |
| Investment securities | 80,000,000 | 224,000,000 |
| Loans, notes, and mortgages | 210,000,000 | 898,000,000 |
| Other assets | 303,000,000 | 1,919,000,000 |
| Total Assets | 2,678,000,000 | 6,461,000,000 |
| Total assets of VIEs | 18,477,000,000 | 28,562,000,000 |
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Real Estate and Other Variable Risk Entities [Member] | Consolidated VIE
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Trading assets | 328,000,000 | 0 |
| Derivative contracts | 0 | 0 |
| Investment securities | 41,000,000 | 162,000,000 |
| Loans, notes, and mortgages | 21,000,000 | 94,000,000 |
| Other assets | 27,000,000 | 1,575,000,000 |
| Total Assets | 417,000,000 | 1,831,000,000 |
| Total assets of VIEs, consolidated | 417,000,000 | 1,831,000,000 |
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Real Estate and Other Variable Risk Entities [Member] | Unconsolidated VIEs
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| Summary of Information Related to Real Estate and Other VIEs [Abstract] | ||
| Trading assets | 1,297,000,000 | 2,980,000,000 |
| Derivative contracts | 460,000,000 | 440,000,000 |
| Investment securities | 39,000,000 | 62,000,000 |
| Loans, notes, and mortgages | 189,000,000 | 804,000,000 |
| Other assets | 276,000,000 | 344,000,000 |
| Total Assets | 2,261,000,000 | 4,630,000,000 |
| Total assets of VIEs, unconsolidated | $ 18,060,000,000 | $ 26,731,000,000 |