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Securitizations and Other Variable Interest Entities - Real Estate and Other VIEs (Details) (USD $)
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3 Months Ended | |||||||||||||||||||||||
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Mar. 31, 2013
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Dec. 31, 2012
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Mar. 31, 2013
Real Estate and Other Variable Risk Entities [Member]
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Dec. 31, 2012
Real Estate and Other Variable Risk Entities [Member]
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Mar. 31, 2013
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Dec. 31, 2012
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Mar. 31, 2013
Real Estate and Other Variable Risk Entities [Member]
Unconsolidated VIEs
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Dec. 31, 2012
Real Estate and Other Variable Risk Entities [Member]
Unconsolidated VIEs
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Mar. 31, 2013
Resecuritization Trusts [Member]
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Mar. 31, 2012
Resecuritization Trusts [Member]
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Mar. 31, 2013
Other Asset Back Financing Arrangement [Member]
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Dec. 31, 2012
Other Asset Back Financing Arrangement [Member]
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Mar. 31, 2013
Real Estate and Other Variable Risk Entities [Member]
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Dec. 31, 2012
Real Estate and Other Variable Risk Entities [Member]
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Mar. 31, 2013
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Dec. 31, 2012
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Mar. 31, 2013
Real Estate and Other Variable Risk Entities [Member]
Unconsolidated VIEs
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Dec. 31, 2012
Real Estate and Other Variable Risk Entities [Member]
Unconsolidated VIEs
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Mar. 31, 2013
Real Estate and Other Variable Risk Entities [Member]
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Dec. 31, 2012
Real Estate and Other Variable Risk Entities [Member]
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Mar. 31, 2013
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Dec. 31, 2012
Real Estate and Other Variable Risk Entities [Member]
Consolidated VIE
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Mar. 31, 2013
Real Estate and Other Variable Risk Entities [Member]
Unconsolidated VIEs
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Dec. 31, 2012
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 | $ 3,424,000,000 | $ 2,473,000,000 | $ 1,331,000,000 | $ 215,000,000 | $ 2,093,000,000 | $ 2,258,000,000 | $ 2,000,000,000 | $ 2,500,000,000 | ||||||||||||||||
| Trading assets | 3,590,000,000 | 1,625,000,000 | 2,387,000,000 | 328,000,000 | 1,203,000,000 | 1,297,000,000 | ||||||||||||||||||
| Derivative contracts | 27,507,000,000 | 24,851,000,000 | 507,000,000 | 460,000,000 | 0 | 0 | 507,000,000 | 460,000,000 | ||||||||||||||||
| Investment securities | 13,087,000,000 | 13,625,000,000 | 74,000,000 | 80,000,000 | 38,000,000 | 41,000,000 | 36,000,000 | 39,000,000 | ||||||||||||||||
| Loans, notes and mortgages | 122,000,000 | 210,000,000 | 20,000,000 | 21,000,000 | 102,000,000 | 189,000,000 | ||||||||||||||||||
| Other assets | 17,235,000,000 | 17,464,000,000 | 259,000,000 | 303,000,000 | 14,000,000 | 27,000,000 | 245,000,000 | 276,000,000 | ||||||||||||||||
| Total Assets | 577,586,000,000 | 602,928,000,000 | 4,552,000,000 | 2,678,000,000 | 2,459,000,000 | 417,000,000 | 2,093,000,000 | 2,261,000,000 | ||||||||||||||||
| Long-term borrowings | 90,106,000,000 | 92,249,000,000 | 1,128,000,000 | 203,000,000 | 1,128,000,000 | 203,000,000 | 0 | 0 | ||||||||||||||||
| Other liabilities | 17,554,000,000 | 18,634,000,000 | 10,000,000 | 12,000,000 | 9,000,000 | 11,000,000 | 1,000,000 | 1,000,000 | ||||||||||||||||
| Total Liabilities | 513,265,000,000 | 538,528,000,000 | 1,138,000,000 | 215,000,000 | 1,137,000,000 | 214,000,000 | 1,000,000 | 1,000,000 | ||||||||||||||||
| Total assets of VIEs, consolidated | 2,459,000,000 | 417,000,000 | ||||||||||||||||||||||
| Total assets of VIEs, unconsolidated | 16,120,000,000 | 18,060,000,000 | ||||||||||||||||||||||
| Total assets of VIEs | 18,579,000,000 | 18,477,000,000 | ||||||||||||||||||||||
| Transfers of Financial Assets Accounted For as Sale Initial Fair Value of Assets Obtained as Proceeds, in Period | $ 6,900,000,000 | $ 9,900,000,000 | ||||||||||||||||||||||
| Financing Provided For Asset Backed Financing Arrangements Percentage | 75.00% | |||||||||||||||||||||||