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Loss And Loss Adjustment Expense Reserves (Loss And LAE Activity) (Narrative) (Details) (USD $) | 3 Months Ended |  | 3 Months Ended | 63 Months Ended | 3 Months Ended |  |  |  |  |  | 3 Months Ended |  | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2012 Insured Issues Designated As "Classified List" [Member] | Mar. 31, 2012 ABS CDO Portfolio [Member] | Mar. 31, 2012 ABS CDO Portfolio [Member] | Mar. 31, 2012 Insured Credit Derivatives [Member] | Mar. 31, 2012 Reviewed [Member] Classified [Member] | Mar. 31, 2012 Loss And LAE Reserves [Member] | Dec. 31, 2011 Loss And LAE Reserves [Member] | Mar. 31, 2012 Insurance Loss Recoverable [Member] | Mar. 31, 2012 Insurance Loss Recoverable [Member] Classified [Member] | Dec. 31, 2011 Insurance Loss Recoverable [Member] Classified [Member] | Mar. 31, 2012 Loan Repurchase Commitments [Member] | Mar. 31, 2012 Recoveries On Unpaid Losses [Member] Reviewed [Member] Classified [Member] | Mar. 31, 2012 Financial Guarantees [Member] | Mar. 31, 2012 Second-Lien RMBS Reserves [Member] | Mar. 31, 2012 Ineligible Mortgage Loans [Member] | Mar. 31, 2012 RMBS And HELOC And CES [Member]
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ABS CDO exposure decrease since December 31,2007 |  |  |  | 84.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate ABS CDO loss and LAE reserves |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 168,000,000 |  |  |
ABS CDO aggregate loss and LAE benefit |  |  |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Total estimated recoveries from ineligible loans |  |  |  |  |  |  |  |  | 2,100,000,000 | (3,116,000,000) | (3,032,000,000) | 1,100,000,000 |  |  | 3,200,000,000 | 3,200,000,000 |
Insurance loss recoverable |  |  |  |  |  |  |  |  |  | (3,137,000,000) | (3,046,000,000) |  |  |  | 2,100,000,000 |  |
Estimated insured credit derivative impairments and LAE reserves, net of reinsurance and recoveries |  |  | 432,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses and loss adjustment | 97,000,000 |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  | 81,000,000 |  |
Elimination of loss and LAE expense as a result of consolidating VIEs |  |  | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess interest cash flows from securitizations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000
Total paid losses, net of reinsurance and collections | 156,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 128,000,000 |  |
Increase in insurance loss recoverable related to paid losses | 91,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for expected future claim payments |  |  |  |  |  |  | 1,400,000,000 | 1,400,000,000 |  |  |  |  |  |  |  |  |
Expected recoveries of future payments |  |  |  |  |  |  | $ 518,000,000 | $ 562,000,000 |  |  |  |  |  |  |  |  |
Number of insured issues reviewed |  | 34 |  |  |  | 29 |  |  |  |  |  |  |  |  |  |  |
Number of insured issues reviewed with recorded recoveries |  |  |  |  |  |  |  |  |  |  |  |  | 26 |  |  |  |
Number of transactions received consideration and excluded from loan files reviewed with potential recoveries | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average risk-free rate used to discount claim liability | 1.73% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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. + 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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- 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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