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Loss And Loss Adjustment Expense Reserves (Loss And LAE Activity) (Narrative) (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Policyholder (Benefits) And Claims Incurred Net | $ 117,000,000 | $ 50,000,000 | $ (80,000,000)
Losses and loss adjustment expense payments, net of reinsurance | 433,000,000 |  |
Decrease in insurance loss recoverable related to paid losses | 3,000,000,000 |  |
Weighted average risk-free rate used to discount claim liability | 2.37% | 1.38% |
Loss and loss adjustment expense collections, net of reinsurance | 2,900,000,000 |  |
Losses and LAE related to actual and expected payments | 98,000,000 |  |
U S Public Finance Insurance [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Losses and loss adjustment expense payments, net of reinsurance | 143,000,000 |  |
Abs Cdo Portfolio [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
ABS CDO exposure decrease since December 31,2007 | 96.00% |  |
Policyholder (Benefits) And Claims Incurred Net | (24,000,000) |  |
Elimination Of Loss And LAE Expense As Result Of Consolidating VIE | 9,000,000 |  |
Rmbs And Heloc And Ces [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Reduction of excess interest cash flows from securitizations | 207,000,000 |  |
Losses and loss adjustment expense payments, net of reinsurance | 196,000,000 |  |
Loss and loss adjustment expense collections, net of reinsurance | 2,800,000,000 |  |
Rmbs And Heloc And Ces [Member] | Ineligible Loan Recoveries [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Change in recoveries of actual and expected payments primarily related to ineligible mortgages | 317,000,000 |  |
Second Lien Residential Mortgage Backed Securities And Reserves [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Policyholder (Benefits) And Claims Incurred Net | (2,000,000) |  |
Elimination Of Loss And LAE Expense As Result Of Consolidating VIE | 50,000,000 |  |
Insurance claim loss recoverable |  | 3,600,000,000 |
Losses and LAE related to actual and expected payments | 108,000,000 |  |
First Lien Residential Mortgage Backed Securities [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Policyholder (Benefits) And Claims Incurred Net | (70,000,000) |  |
Elimination Of Loss And LAE Expense As Result Of Consolidating VIE | 3,000,000 |  |
Losses and LAE related to actual and expected payments | (60,000,000) |  |
Financial Guarantee [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Aggregate ABS CDO Loss And LAE Reserves | 115,000,000 |  |
Financial Guarantee [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Aggregate ABS CDO Loss And LAE Reserves | 226,000,000 |  |
Loss And Lae Reserves [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Reserves for expected future claim payments | 847,000,000 | 1,200,000,000 |
Expected recoveries of future payments | 206,000,000 | 332,000,000 |
Recoveries On Unpaid Losses [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Expected recoveries of future payments | 206,000,000 | 332,000,000 | 562,000,000
Insurance Loss Recoverable [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Insurance loss recoverable | 694,000,000 | 3,648,000,000 | 3,046,000,000
Insurance Loss Recoverable [Member] | Classified [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Insurance claim loss recoverable | 694,000,000 | 3,610,000,000 |
Insurance loss recoverable | 694,000,000 | 3,648,000,000 |
Insurance Loss Recoverable [Member] | Second Lien Residential Mortgage Backed Securities And Reserves [Member] | Ineligible Loan Recoveries [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Insurance loss recoverable |  | 2,500,000,000 |
Loan Repurchase Commitments [Member] | Second Lien Residential Mortgage Backed Securities And Reserves [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Loan repurchase commitments |  | 1,100,000,000 |
Loan Repurchase Commitments [Member] | Second Lien Residential Mortgage Backed Securities And Reserves [Member] | Ineligible Loan Recoveries [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Total estimated insurance recoveries | $ 359,000,000 |  |

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- Definition ABS CDO exposure decrease. + References No definition available. + Details
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- Definition Aggregate ABS CDO loss and LAE reserves. + References No definition available. + Details
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- Definition Change In Recoveries Of Actual And Expected Payments Related To Ineligible Mortgages + References No definition available. + Details
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- Definition Elimination Of Loss And LAE Expense As Result Of Consolidating VIEs + References No definition available. + Details
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- Definition Excess Interest Cash Flows From Securitizations + References No definition available. + Details
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- Definition Gross reserve, recoveries on unpaid losses + References No definition available. + 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. + References No definition available. + 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. + References No definition available. + Details
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- Definition The fair value of financial instruments that represent the right of the Trust against the seller/servicer for loans that were not compliant with the representations and warranties of the loan underwriting. The Trust has the right to demand that the transferor replace ineligible loans with a compliant loan or repurchase the non-compliant loan. + References No definition available. + Details
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- Definition Loss And Loss Adjustment Expense Collections Net Of Reinsurance And Payments + References No definition available. + Details
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- Details
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- Definition This element represents losses and loss adjustments expense payments net of reinsurance. + References No definition available. + Details
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- Definition Losses And Loss Adjustment Expenses Related To Actual And Expected Payments + References No definition available. + Details
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- Definition Reserves For Expected Future Claim Payments + References No definition available. + Details
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- Definition Total Estimated Insurance 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 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + 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 -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 Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 5 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 + Details
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