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Securitizations and Other Variable Interest Entities - Real Estate and Other VIEs (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||||||||||||||||||||||||||||
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Sep. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2012
Real Estate and Other Variable Risk Entities [Member]
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Dec. 31, 2011
Real Estate and Other Variable Risk Entities [Member]
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Sep. 30, 2012
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Dec. 31, 2011
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Sep. 30, 2012
Real Estate and Other Variable Risk Entities [Member]
Unconsolidated VIEs
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Dec. 31, 2011
Real Estate and Other Variable Risk Entities [Member]
Unconsolidated VIEs
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Sep. 30, 2012
Resecuritization Trusts [Member]
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Sep. 30, 2011
Resecuritization Trusts [Member]
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Sep. 30, 2012
Resecuritization Trusts [Member]
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Sep. 30, 2011
Resecuritization Trusts [Member]
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Sep. 30, 2012
Other Asset Back Financing Arrangement [Member]
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Dec. 31, 2011
Other Asset Back Financing Arrangement [Member]
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Sep. 30, 2012
Real Estate and Other Variable Risk Entities [Member]
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Dec. 31, 2011
Real Estate and Other Variable Risk Entities [Member]
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Sep. 30, 2012
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Dec. 31, 2011
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Sep. 30, 2012
Real Estate and Other Variable Risk Entities [Member]
Unconsolidated VIEs
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Dec. 31, 2011
Real Estate and Other Variable Risk Entities [Member]
Unconsolidated VIEs
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Sep. 30, 2012
Real Estate and Other Variable Risk Entities [Member]
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Dec. 31, 2011
Real Estate and Other Variable Risk Entities [Member]
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Sep. 30, 2012
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Dec. 31, 2011
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Sep. 30, 2012
Real Estate and Other Variable Risk Entities [Member]
Unconsolidated VIEs
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Dec. 31, 2011
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 | $ 3,681,000,000 | $ 6,452,000,000 | $ 639,000,000 | $ 1,821,000,000 | $ 3,042,000,000 | $ 4,631,000,000 | $ 3,400,000,000 | $ 4,700,000,000 | ||||||||||||||||||||||
| Trading assets | 3,213,000,000 | 2,980,000,000 | 1,401,000,000 | 0 | 1,812,000,000 | 2,980,000,000 | ||||||||||||||||||||||||
| Derivative contracts | 26,621,000,000 | 35,013,000,000 | 432,000,000 | 440,000,000 | 0 | 0 | 432,000,000 | 440,000,000 | ||||||||||||||||||||||
| Investment securities | 6,389,000,000 | 6,684,000,000 | 84,000,000 | 224,000,000 | 41,000,000 | 162,000,000 | 43,000,000 | 62,000,000 | ||||||||||||||||||||||
| Loans, notes and mortgages | 489,000,000 | 898,000,000 | 21,000,000 | 94,000,000 | 468,000,000 | 804,000,000 | ||||||||||||||||||||||||
| Other assets | 14,909,000,000 | 15,155,000,000 | 315,000,000 | 1,919,000,000 | 27,000,000 | 1,575,000,000 | 288,000,000 | 344,000,000 | ||||||||||||||||||||||
| Total Assets | 595,379,000,000 | 556,463,000,000 | 4,533,000,000 | 6,461,000,000 | 1,490,000,000 | 1,831,000,000 | 3,043,000,000 | 4,630,000,000 | ||||||||||||||||||||||
| Long-term borrowings | 93,548,000,000 | [1] | 106,929,000,000 | [1] | 852,000,000 | 10,000,000 | 852,000,000 | 10,000,000 | 0 | 0 | ||||||||||||||||||||
| Other liabilities | 18,553,000,000 | 18,099,000,000 | 173,000,000 | 450,000,000 | 171,000,000 | 185,000,000 | 2,000,000 | 265,000,000 | ||||||||||||||||||||||
| Total Liabilities | 546,226,000,000 | 506,495,000,000 | 1,025,000,000 | 460,000,000 | 1,023,000,000 | 195,000,000 | 2,000,000 | 265,000,000 | ||||||||||||||||||||||
| Total assets of VIEs, consolidated | 1,490,000,000 | 1,831,000,000 | ||||||||||||||||||||||||||||
| Total assets of VIEs, unconsolidated | 21,493,000,000 | 26,731,000,000 | ||||||||||||||||||||||||||||
| Total assets of VIEs | 22,983,000,000 | 28,562,000,000 | ||||||||||||||||||||||||||||
| Transfers of Financial Assets Accounted For as Sale Initial Fair Value of Assets Obtained as Proceeds, in Period | $ 12,200,000,000 | $ 600,000,000 | $ 36,500,000,000 | $ 8,100,000,000 | ||||||||||||||||||||||||||
| Financing Provided For Asset Backed Financing Arrangements Percentage | 75.00% | |||||||||||||||||||||||||||||
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