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Securitizations and Other Variable Interest Entities - First Lien Mortgages (Details) (USD $)
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3 Months Ended | 9 Months Ended | |||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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Consumer Mortgage [Member]
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| In Text Details [Abstract] | |||||||||||||
| Servicing Fee And Ancillary Fee Income | $ 674,000,000 | $ 1,100,000,000 | $ 2,300,000,000 | $ 3,600,000,000 | |||||||||
| Servicing Advance | 15,500,000,000 | 15,500,000,000 | 23,200,000,000 | ||||||||||
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First Lien Mortgages [Member]
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| Table Details [Abstract] | |||||||||||||
| Gain on Sale of Mortgage Loans | 379,000,000 | 563,000,000 | 1,700,000,000 | 1,300,000,000 | |||||||||
| In Text Details [Abstract] | |||||||||||||
| Fair value of securities received in connection with first-lien mortgage securitizations | 490,000,000 | 315,000,000 | 3,000,000,000 | 2,500,000,000 | |||||||||
| Loans repurchased from investors and securitization trusts | 3,100,000,000 | 2,500,000,000 | 9,400,000,000 | 5,200,000,000 | |||||||||
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First Lien Mortgages [Member] | Agency Securities [Member]
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| Securitizations Related Information [Abstract] | |||||||||||||
| Cash proceeds from new securitizations | 14,068,000,000 | [1] | 12,461,000,000 | [1] | 41,444,000,000 | [1] | 27,688,000,000 | [1] | |||||
| Loss on securitizations, net of hedges | 36,000,000 | [2] | (89,000,000) | [2] | 92,000,000 | [2] | (151,000,000) | [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] | 335,000,000 | [1] | 208,000,000 | [1] | 660,000,000 | [1] | |||||
| Loss on securitizations, net of hedges | $ 0 | [2] | $ 0 | [2] | $ 0 | [2] | $ 0 | [2] | |||||
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