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Securitizations and Other Variable Interest Entities - First Lien Mortgages (Details) (USD $)
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3 Months Ended | ||||||||
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Mar. 31, 2014
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Mar. 31, 2013
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Dec. 31, 2013
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Consumer Mortgage [Member]
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| In Text Details [Abstract] | |||||||||
| Servicing Fee And Ancillary Fee Income | $ 494,000,000 | $ 897,000,000 | |||||||
| Servicing Advance | 12,700,000,000 | 14,100,000,000 | |||||||
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First Lien Mortgages [Member]
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| Table Details [Abstract] | |||||||||
| Gain on Sale of Mortgage Loans | 198,000,000 | 613,000,000 | |||||||
| In Text Details [Abstract] | |||||||||
| Transfers of Financial Assets Accounted for as Sale, Initial Fair Value of Assets Obtained as Proceeds | 506,000,000 | 968,000,000 | |||||||
| Loans repurchased from investors and securitization trusts | 1,300,000,000 | 3,200,000,000 | |||||||
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First Lien Mortgages [Member] | Agency MBS [Member]
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| Securitizations Related Information [Abstract] | |||||||||
| Cash proceeds from new securitizations | 7,466,000,000 | [1] | 12,013,000,000 | [1] | |||||
| Gain (loss) on securitizations | (11,000,000) | [2] | 29,000,000 | [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 | 704,000,000 | [1] | 0 | [1] | |||||
| Gain (loss) on securitizations | $ 27,000,000 | [2] | $ 0 | [2] | |||||
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