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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, 2012
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Dec. 31, 2011
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Counterparty | $ 28,278,000,000 | [1],[2],[3] | $ 12,607,000,000 | [1],[2] | ||||||
| Outstanding Claims By Product Type | 28,278,000,000 | [1],[2],[3] | 12,607,000,000 | [1],[2] | ||||||
| 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 | 1,600,000,000 | 1,700,000,000 | ||||||||
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GSEs [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Counterparty | 13,530,000,000 | [1],[2],[3] | 6,221,000,000 | [1],[2] | ||||||
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Monoline [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Counterparty | 2,449,000,000 | [1],[2] | 3,082,000,000 | [1],[2] | ||||||
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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 | 12,299,000,000 | [1],[2] | 3,304,000,000 | [1],[2] | ||||||
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Prime loans [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | 8,793,000,000 | [1],[2] | 3,925,000,000 | [1],[2] | ||||||
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Alt [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | 5,428,000,000 | [1],[2] | 2,286,000,000 | [1],[2] | ||||||
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Home Equity [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | 2,394,000,000 | [1],[2] | 2,872,000,000 | [1],[2] | ||||||
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Pay option [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | 5,884,000,000 | [1],[2] | 1,993,000,000 | [1],[2] | ||||||
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Subprime [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | 3,687,000,000 | [1],[2] | 891,000,000 | [1],[2] | ||||||
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Other Product Type [Member]
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| Guarantor Obligations [Line Items] | ||||||||||
| Outstanding Claims By Product Type | 2,092,000,000 | [1],[2] | 640,000,000 | [1],[2] | ||||||
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Whole loan sale, private-label securitizations and other [Member]
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| Table Details [Abstract] | ||||||||||
| Repurchase Demands Received Excluded from Outstanding Claims | $ 1,400,000,000 | |||||||||
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