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Representations and Warranties Obligations and Corporate Guarantees - Outstanding Claims (Details) (USD $)
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3 Months Ended | |||||||
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Mar. 31, 2012
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Dec. 31, 2011
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Counterparty | $ 16,094,000,000 | [1],[2] | $ 12,607,000,000 | [1],[2] | ||||
| Outstanding Claims By Product Type | 16,094,000,000 | [1],[2] | 12,607,000,000 | [1],[2] | ||||
| Table Details [Abstract] | ||||||||
| Outstanding Claims, From Mortgage Insurance Recission Notices | 1,400,000,000 | 1,200,000,000 | ||||||
| Repurchase Demands Excluded from Outstanding Claims | 3,100,000,000 | 1,700,000,000 | ||||||
| Repurchase Demands Received Excluded from Outstanding Claims | 1,400,000,000 | |||||||
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GSEs [Member]
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Counterparty | 8,103,000,000 | [1],[2] | 6,258,000,000 | [1],[2] | ||||
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Monoline [Member]
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Counterparty | 3,136,000,000 | [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 | 4,855,000,000 | [1],[2] | 3,267,000,000 | [1],[2] | ||||
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Prime loans [Member]
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| Guarantor Obligations [Line Items] | ||||||||
| Outstanding Claims By Product Type | 4,996,000,000 | [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 | 3,009,000,000 | [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 | 2,932,000,000 | [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 | 3,343,000,000 | [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 | 1,028,000,000 | [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 | $ 786,000,000 | [1],[2] | $ 640,000,000 | [1],[2] | ||||
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