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Securitizations and Other Variable Interest Entities - First Lien Mortgages (Details) (USD $)
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12 Months Ended | |||||||
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Dec. 31, 2011
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Dec. 31, 2010
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Commercial Mortgage Backed Securities [Member]
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| In Text Details [Abstract] | ||||||||
| Servicing Fee And Ancillary Fee Income | $ 12,000,000 | $ 21,000,000 | ||||||
| Servicing Advance | 152,000,000 | 156,000,000 | ||||||
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Consumer Mortgage [Member]
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| In Text Details [Abstract] | ||||||||
| Servicing Fee And Ancillary Fee Income | 5,800,000,000 | 6,400,000,000 | ||||||
| Servicing Advance | 26,000,000,000 | 24,300,000,000 | ||||||
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First Lien Mortgages [Member]
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| Table Details [Abstract] | ||||||||
| Gain on Sale of Mortgage Loans | 2,900,000,000 | 5,100,000,000 | ||||||
| In Text Details [Abstract] | ||||||||
| Loans repurchased from investors and securitization trusts | 9,000,000,000 | 14,500,000,000 | ||||||
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First Lien Mortgages [Member] | Residential Mortgage Backed Securities [Member]
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| In Text Details [Abstract] | ||||||||
| Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds | 545,000,000 | 23,700,000,000 | ||||||
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First Lien Mortgages [Member] | Agency Securities [Member]
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| Securitizations Related Information [Abstract] | ||||||||
| Cash proceeds from new securitizations | 142,910,000,000 | [1] | 243,901,000,000 | [1] | ||||
| Loss on securitizations, net of hedges | (373,000,000) | [2] | (473,000,000) | [2] | ||||
| Cash flows received on residual interests | 0 | 0 | ||||||
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First Lien Mortgages [Member] | Prime Loan [Member]
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| Securitizations Related Information [Abstract] | ||||||||
| Loss on securitizations, net of hedges | 0 | 0 | ||||||
| Cash flows received on residual interests | 3,000,000 | 18,000,000 | ||||||
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First Lien Mortgages [Member] | Subprime Loan [Member]
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| Securitizations Related Information [Abstract] | ||||||||
| Cash proceeds from new securitizations | 0 | 0 | ||||||
| Loss on securitizations, net of hedges | 0 | 0 | ||||||
| Cash flows received on residual interests | 38,000,000 | 58,000,000 | ||||||
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First Lien Mortgages [Member] | Alt-A Loan [Member]
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| Securitizations Related Information [Abstract] | ||||||||
| Cash proceeds from new securitizations | 36,000,000 | [1] | 7,000,000 | [1] | ||||
| Loss on securitizations, net of hedges | 0 | 0 | ||||||
| Cash flows received on residual interests | 6,000,000 | 2,000,000 | ||||||
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First Lien Mortgages [Member] | Commercial Mortgage Backed Securities [Member]
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| Securitizations Related Information [Abstract] | ||||||||
| Cash proceeds from new securitizations | 4,468,000,000 | [1] | 4,227,000,000 | [1] | ||||
| Loss on securitizations, net of hedges | 0 | 0 | ||||||
| Cash flows received on residual interests | $ 18,000,000 | $ 20,000,000 | ||||||
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