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Representations and Warranties Obligations and Corporate Guarantees - Outstanding Claims (Details) (USD $)
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12 Months Ended | |||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Counterparty | $ 19,655,000,000 | [1],[2],[3] | $ 28,101,000,000 | [1],[2],[3] | ||||||
| Outstanding Claims By Product Type | 19,655,000,000 | [1],[2],[3] | 28,101,000,000 | [1],[2],[3] | ||||||
| Table Details [Abstract] | ||||||||||
| Loss On Repurchase Or Reimbursement Of Repurchase Claims For First Lien Mortgages And Home Equity Loans From The Investor Or Securitization Trust | 1,200,000,000 | 1,600,000,000 | ||||||||
| Repurchase Demands Received Excluded from Outstanding Claims | 273,000,000 | |||||||||
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GSEs [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Counterparty | 170,000,000 | [1],[3] | 13,437,000,000 | [1],[3] | ||||||
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Monoline [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Counterparty | 1,532,000,000 | [1],[3] | 2,442,000,000 | [1],[3] | ||||||
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Whole loan sale, private-label securitizations and other [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Counterparty | 17,953,000,000 | [1],[2],[3] | 12,222,000,000 | [1],[2],[3] | ||||||
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Prime loans [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | 623,000,000 | [1],[3] | 8,724,000,000 | [1],[3] | ||||||
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Alt [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | 1,536,000,000 | [1],[3] | 5,422,000,000 | [1],[3] | ||||||
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Home Equity Line of Credit [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | 1,889,000,000 | [1],[3] | 2,390,000,000 | [1],[3] | ||||||
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Pay option [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | 5,776,000,000 | [1],[3] | 5,877,000,000 | [1],[3] | ||||||
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Subprime [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | 7,502,000,000 | [1],[3] | 4,227,000,000 | [1],[3] | ||||||
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Other Product Type [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | $ 2,329,000,000 | [1],[3] | $ 1,461,000,000 | [1],[3] | ||||||
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