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Loss And Loss Adjustment Expense Reserves (Loss And LAE Activity) (Narrative) (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2011 | Dec. 31, 2010
Losses and LAE related to actual and expected payments | $ (38,000,000) |
Recoveries of amounts expected to be paid from excess cash flows within securitizations | 88,000,000 |
Total paid losses, net of reinsurance and collections | 403,000,000 |
(Increase)/decrease in insurance loss recoverable | 122,000,000 |
Weighted average risk-free rate used to discount claim liability | 2.42% |
Increase decrease related to loss payments and changes in discount rates | 264,000,000 |
RMBS [Member] |  |
Losses and LAE related to actual and expected payments | 16,000,000 |
Number of insured issues reviewed | 32 |
Estimated insurance recoveries | 2,700,000,000 |
Total paid losses, net of reinsurance and collections | 333,000,000 |
Ineligible Mortgage Loans [Member] |  |
Estimated insurance recoveries | 2,700,000,000 |
Changes in Assumptions | 127,000,000 |
Loss and LAE Reserves [Member] |  |
Loss and loss adjustment expense reserves | 865,000,000 | 1,129,000,000
Reserves for expected future claim payments | 1,600,000,000 | 2,000,000,000
Expected recoveries of future payments | 701,000,000 | 896,000,000
Changes in Assumptions | 64,000,000 |
Loss and LAE Reserves [Member] | Classified [Member] |  |
Loss and loss adjustment expense reserves | 865,000,000 | 1,129,000,000
Insurance Loss Recoverable [Member] |  |
Estimated insurance recoveries | 1,800,000,000 |
Insurance Loss Recoverable [Member] | Classified [Member] |  |
Loss and loss adjustment expense reserves | 70,000,000 | 70,000,000
Estimated insurance recoveries | (2,655,000,000) | (2,531,000,000)
Loan Repurchase Commitments [Member] |  |
Estimated insurance recoveries | 905,000,000 |
Unpaid Losses [Member] |  |
Changes in Assumptions | $ 195,000,000 |
Reviewed [Member] | Classified [Member] |  |
Number of insured issues reviewed | 30 |

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- Definition Increase decrease in carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts related to recoveries related to commitments to repurchase ineligible loans within an (issue) and recoveries expected on paid claims. + Details
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- Definition Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Alternate concept name for the aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 13 -Subparagraph a + Details
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