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Securitizations and Other Variable Interest Entities - Real Estate and Other VIEs (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||||||||||||||||||||||||
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Jun. 30, 2013
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Dec. 31, 2012
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Jun. 30, 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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Jun. 30, 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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Jun. 30, 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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Jun. 30, 2013
Resecuritization Trusts [Member]
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Jun. 30, 2012
Resecuritization Trusts [Member]
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Jun. 30, 2013
Resecuritization Trusts [Member]
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Jun. 30, 2012
Resecuritization Trusts [Member]
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Jun. 30, 2013
Other Asset Back Financing Arrangement [Member]
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Dec. 31, 2012
Other Asset Back Financing Arrangement [Member]
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Jun. 30, 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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Jun. 30, 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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Jun. 30, 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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Jun. 30, 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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Jun. 30, 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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Jun. 30, 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 | $ 2,688,000,000 | $ 2,473,000,000 | $ 437,000,000 | $ 215,000,000 | $ 2,251,000,000 | $ 2,258,000,000 | $ 1,500,000,000 | $ 2,500,000,000 | ||||||||||||||||||
| Trading assets | 2,223,000,000 | 1,625,000,000 | 717,000,000 | 328,000,000 | 1,506,000,000 | 1,297,000,000 | ||||||||||||||||||||
| Derivative contracts | 27,633,000,000 | 24,851,000,000 | 406,000,000 | 460,000,000 | 0 | 0 | 406,000,000 | 460,000,000 | ||||||||||||||||||
| Investment securities | 14,077,000,000 | 13,625,000,000 | 38,000,000 | 80,000,000 | 38,000,000 | 41,000,000 | 0 | 39,000,000 | ||||||||||||||||||
| Loans, notes and mortgages | 128,000,000 | 210,000,000 | 18,000,000 | 21,000,000 | 110,000,000 | 189,000,000 | ||||||||||||||||||||
| Other assets | 16,586,000,000 | 17,464,000,000 | 229,000,000 | 303,000,000 | 0 | 27,000,000 | 229,000,000 | 276,000,000 | ||||||||||||||||||
| Total Assets | 572,908,000,000 | 602,928,000,000 | 3,024,000,000 | 2,678,000,000 | 773,000,000 | 417,000,000 | 2,251,000,000 | 2,261,000,000 | ||||||||||||||||||
| Long-term borrowings | 81,551,000,000 | 92,249,000,000 | 336,000,000 | 203,000,000 | 336,000,000 | 203,000,000 | 0 | 0 | ||||||||||||||||||
| Other liabilities | 18,834,000,000 | 18,634,000,000 | 1,000,000 | 12,000,000 | 0 | 11,000,000 | 1,000,000 | 1,000,000 | ||||||||||||||||||
| Total Liabilities | 507,598,000,000 | 538,528,000,000 | 337,000,000 | 215,000,000 | 336,000,000 | 214,000,000 | 1,000,000 | 1,000,000 | ||||||||||||||||||
| Total assets of VIEs, consolidated | 773,000,000 | 417,000,000 | ||||||||||||||||||||||||
| Total assets of VIEs, unconsolidated | 22,482,000,000 | 18,060,000,000 | ||||||||||||||||||||||||
| Total assets of VIEs | 23,255,000,000 | 18,477,000,000 | ||||||||||||||||||||||||
| Transfers of Financial Assets Accounted For as Sale Initial Fair Value of Assets Obtained as Proceeds, in Period | $ 4,700,000,000 | $ 14,300,000,000 | $ 11,500,000,000 | $ 24,300,000,000 | ||||||||||||||||||||||
| Financing Provided For Asset Backed Financing Arrangements Percentage | 75.00% | |||||||||||||||||||||||||