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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, 2011
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Dec. 31, 2010
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Counterparty | $ 14,252,000,000 | [1],[2] | $ 10,687,000,000 | [1],[2] | ||||
| Outstanding Claims By Product Type | 14,252,000,000 | [2] | 10,687,000,000 | [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 | 1,700,000,000 | 1,700,000,000 | ||||||
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GSEs [Member]
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Counterparty | 6,258,000,000 | [2] | 2,821,000,000 | [2] | ||||
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Monoline [Member]
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Counterparty | 3,082,000,000 | [2] | 4,678,000,000 | [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 | 4,912,000,000 | [1],[2] | 3,188,000,000 | [1],[2] | ||||
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Prime loans [Member]
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Product Type | 3,928,000,000 | [2] | 2,040,000,000 | [2] | ||||
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Alt [Member]
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Product Type | 2,333,000,000 | [2] | 1,190,000,000 | [2] | ||||
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Home Equity [Member]
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Product Type | 2,872,000,000 | [2] | 3,658,000,000 | [2] | ||||
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Pay option [Member]
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Product Type | 3,588,000,000 | [2] | 2,889,000,000 | [2] | ||||
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Subprime [Member]
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Product Type | 891,000,000 | [2] | 734,000,000 | [2] | ||||
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Other Product Type [Member]
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Product Type | $ 640,000,000 | [2] | $ 176,000,000 | [2] | ||||
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