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Loss And Loss Adjustment Expense Reserves (Loss And LAE Activity) (Narrative) (Details) (USD $) | 12 Months Ended |  | 12 Months Ended | 48 Months Ended |  |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 Insured Issues Designated As Classified List [Member] | Dec. 31, 2011 ABS CDO Portfolio [Member] | Dec. 31, 2011 ABS CDO Portfolio [Member] | Dec. 31, 2011 Reviewed [Member] Classified [Member] | Dec. 31, 2011 Loss And LAE Reserves [Member] | Dec. 31, 2010 Loss And LAE Reserves [Member] | Dec. 31, 2011 Insurance Loss Recoverable [Member] Classified [Member] | Dec. 31, 2010 Insurance Loss Recoverable [Member] Classified [Member] | Dec. 31, 2011 Recoveries On Unpaid Losses [Member] Reviewed [Member] Classified [Member] | Dec. 31, 2011 Second-Lien RMBS [Member] | Dec. 31, 2010 Second-Lien RMBS [Member] | Dec. 31, 2011 Second-Lien RMBS [Member] Loan Repurchase Commitments [Member] | Dec. 31, 2011 Ineligible Mortgage Loans [Member] | Dec. 31, 2010 Ineligible Mortgage Loans [Member] | Dec. 31, 2011 RMBS And HELOC And CES [Member] | Dec. 31, 2011 Financial Guarantees [Member] | Dec. 31, 2011 Insured Credit Derivatives [Member]
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ABS CDO exposure decrease since December 31, 2007 |  |  |  |  | 83.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate ABS CDO loss and LAE reserves |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 171,000,000 |
ABS CDO aggregate loss and LAE benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 551,000,000
Estimated insurance recoveries |  |  |  |  |  |  |  |  | 3,032,000,000 | 2,531,000,000 |  | 3,100,000,000 |  | 835,000,000 | 3,100,000,000 | 2,500,000,000 |  |  |
Insurance loss recoverable on ineligible loans |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000 | 1,700,000,000 |  |  |  |  |  |
Insurance loss recoverable |  |  |  |  |  |  |  |  | 3,046,000,000 | 2,531,000,000 |  | 2,000,000,000 |  |  |  |  |  |  |
Estimated insured credit derivative impairments and LAE reserves, net of reinsurance and recoveries |  |  |  | 444,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses and loss adjustment |  |  |  | 32,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Elimination of loss and LAE expense as a result of consolidating VIEs |  |  |  | 44,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in recoveries of actual and expected payments related to ineligible mortgages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 448,000,000 |  |
Excess interest cash flows from securitizations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,000,000 |  |
Total paid losses, net of reinsurance and collections | 729,000,000 |  |  |  |  |  |  |  |  |  |  | 507,000,000 |  |  |  |  |  |  |
Increase in insurance loss recoverable related to paid losses | 507,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for expected future claim payments |  |  |  |  |  |  | 1,400,000,000 | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Expected recoveries of future payments |  |  |  |  |  |  | $ 562,000,000 | $ 896,000,000 |  |  |  |  |  |  |  |  |  |  |
Number of insured issues reviewed |  |  | 34 |  |  | 29 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of insured issues reviewed with recorded recoveries |  |  |  |  |  |  |  |  |  |  | 26 |  |  |  |  |  |  |  |
Weighted average risk-free rate used to discount claim liability | 1.53% | 2.73% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Estimated insured credit derivative impairments and loss adjustment expense reserves net of reinsurance and recoveries. + References No definition available. + 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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