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Securitizations and Other Variable Interest Entities - First Lien Mortgages (Details) (USD $)
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3 Months Ended | 6 Months Ended | |||||||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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| Variable Interest Entity [Line Items] | |||||||||||||
| Weighted average remaining life of bonds held in the trusts in years | 8 years 10 months 24 days | ||||||||||||
| In Text Details [Abstract] | |||||||||||||
| Fair value of securities connection with agency first lien residential mortgage securitizations | $ 21,000,000 | $ 455,000,000 | $ 21,000,000 | $ 455,000,000 | |||||||||
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Commercial Mortgage Backed Securities [Member]
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| In Text Details [Abstract] | |||||||||||||
| Servicing Fee And Ancillary Fee Income | 8,000,000 | (1,000,000) | 9,000,000 | 2,000,000 | |||||||||
| Servicing Advance | 173,000,000 | 173,000,000 | 152,000,000 | ||||||||||
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Consumer Mortgage [Member]
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| In Text Details [Abstract] | |||||||||||||
| Servicing Fee And Ancillary Fee Income | 1,200,000,000 | 1,500,000,000 | 2,500,000,000 | 3,100,000,000 | |||||||||
| Servicing Advance | 24,600,000,000 | 24,600,000,000 | 26,000,000,000 | ||||||||||
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First Lien Mortgages [Member]
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| Table Details [Abstract] | |||||||||||||
| Gain on Sale of Mortgage Loans | 395,000,000 | 765,000,000 | 714,000,000 | 1,800,000,000 | |||||||||
| In Text Details [Abstract] | |||||||||||||
| Loans repurchased from investors and securitization trusts | 2,500,000,000 | 1,800,000,000 | 2,700,000,000 | 7,600,000,000 | |||||||||
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First Lien Mortgages [Member] | Agency Securities [Member]
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| Securitizations Related Information [Abstract] | |||||||||||||
| Cash proceeds from new securitizations | 8,889,000,000 | [1] | 36,222,000,000 | [1] | 15,227,000,000 | [1] | 96,976,000,000 | [1] | |||||
| Loss on securitizations, net of hedges | (45,000,000) | [2] | (227,000,000) | [2] | (62,000,000) | [2] | (55,000,000) | [2] | |||||
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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 | 0 | [1] | 1,802,000,000 | [1] | 325,000,000 | [1] | 1,802,000,000 | [1] | |||||
| Loss on securitizations, net of hedges | $ 0 | [2] | $ 0 | [2] | $ 0 | [2] | $ 0 | [2] | |||||
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