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Loss And Loss Adjustment Expense Reserves (Loss And LAE Activity) (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended |  |  |  | 9 Months Ended | 45 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 Second-Lien RMBS [Member] | Sep. 30, 2011 Ineligible Mortgage Loans [Member] | Sep. 30, 2011 RMBS And HELOC And CES [Member] | Sep. 30, 2011 Loss And LAE Reserves [Member] | Dec. 31, 2010 Loss And LAE Reserves [Member] | Sep. 30, 2011 Insurance Loss Recoverable [Member] | Sep. 30, 2011 Insurance Loss Recoverable [Member] Classified [Member] | Dec. 31, 2010 Insurance Loss Recoverable [Member] Classified [Member] | Sep. 30, 2011 Loan Repurchase Commitments [Member] | Sep. 30, 2011 Recoveries On Unpaid Losses [Member] Reviewed [Member] Classified [Member] | Sep. 30, 2011 Reviewed [Member] Classified [Member] | Sep. 30, 2011 Insured Issues Designated As Classified List [Member] | Sep. 30, 2011 ABS CDO Portfolio [Member] | Sep. 30, 2011 ABS CDO Portfolio [Member]
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ABS CDO exposure decrease since December 31,2007 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00%
Aggregate ABS CDO loss and LAE reserves | $ 179,000,000 |  | $ 179,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ABS CDO aggregate loss and LAE benefit |  |  | 484,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated insurance recoveries |  |  |  |  | 2,800,000,000 | 2,800,000,000 |  |  |  | 1,900,000,000 | (2,761,000,000) | (2,531,000,000) | 938,000,000 |  |  |  |  |
Insurance loss recoverable |  |  |  |  | 1,900,000,000 |  |  |  |  |  | (2,770,000,000) | (2,531,000,000) |  |  |  |  | 92,000,000 | 92,000,000
Estimated insured credit derivative impairments and LAE reserves, net of reinsurance and recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 511,000,000 |
Losses and loss adjustment | 190,000,000 | (20,000,000) | 204,000,000 | 122,000,000 | 35,000,000 |  |  |  |  |  |  |  |  |  |  |  | 51,000,000 |
Elimination of loss and LAE expense as a result of consolidating VIEs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 79,000,000 |
Recoveries of amounts from excess cash flows within securitizations |  |  |  |  |  |  | 198,000,000 |  |  |  |  |  |  |  |  |  |  |
Excess interest cash flows from securitizations |  |  |  |  |  |  | 76,000,000 |  |  |  |  |  |  |  |  |  |  |
Total paid losses, net of reinsurance and collections |  |  | 634,000,000 |  | 463,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in insurance loss recoverable related to paid losses |  |  | 231,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for expected future claim payments |  |  |  |  |  |  |  | 1,600,000,000 | 2,000,000,000 |  |  |  |  |  |  |  |  |
Expected recoveries of future payments |  |  |  |  |  |  |  | $ 687,000,000 | $ 896,000,000 |  |  |  |  |  |  |  |  |
Number of insured issues reviewed |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29 | 34 |  |
Number of insured issues reviewed with recorded recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |
Weighted average risk-free rate used to discount claim liability |  |  | 1.51% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition ABS CDO exposure decrease. + Details
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- Definition Aggregate ABS CDO loss and LAE reserves. + Details
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- Definition Elimination Of Loss And LAE Expense As Result Of Consolidating VIEs + Details
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- Definition Estimated Insured Credit Derivative Impairments And Loss Adjustment Expense Reserves Net Of Reinsurance And Recoveries + Details
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- Definition Excess Interest Cash Flows From Securitizations + Details
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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 recoveries on paid claims. + Details
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- Definition Carrying amount as of the balance sheet date of paid insurance policy claims and LAE expense expected to be recovered. + Details
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- Definition Loss And Loss Adjustment Expense Reserves [Line Items] + Details
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- Definition Number Of Insured Issues Reviewed With Recorded Recoveries + Details
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- Definition Reserves For Expected Future Claim Payments + Details
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- Definition Supplementary Insurance Information Paid Losses Net Of Reinsurance And Collections + 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 This element represents the weighted average risk free rate used to discount the claim liability related to financial guarantee insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Number 163 -Paragraph 30 -Subparagraph f(1) -Name Statement of Financial Accounting Standard (FAS) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6933314&loc=SL5749324-161292 + Details
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- Definition Provision for benefits, claims and claims settlement expenses incurred during the period net of the effects of contracts assumed and ceded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 5 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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