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Loss And Loss Adjustment Expense Reserves (Loss And LAE Activity) (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Abs Cdo Portfolio [Member] | Jun. 30, 2014 Second Lien Residential Mortgage Backed Securities And Reserves [Member] | Jun. 30, 2014 First Lien Residential Mortgage Backed Securities [Member] | Jun. 30, 2014 Financial Guarantee [Member] | Dec. 31, 2013 Financial Guarantee [Member] | Jun. 30, 2014 Financial Guarantee [Member] Variable Interest Entity Primary Beneficiary [Member] | Dec. 31, 2013 Financial Guarantee [Member] Variable Interest Entity Primary Beneficiary [Member] | Jun. 30, 2014 Loss And Lae Reserves [Member] | Dec. 31, 2013 Loss And Lae Reserves [Member] | Jun. 30, 2014 Recoveries On Unpaid Losses [Member] | Dec. 31, 2013 Recoveries On Unpaid Losses [Member] | Jun. 30, 2014 Insurance Loss Recoverable [Member] | Dec. 31, 2013 Insurance Loss Recoverable [Member] | Jun. 30, 2014 Insurance Loss Recoverable [Member] Classified [Member] | Dec. 31, 2013 Insurance Loss Recoverable [Member] Classified [Member] | Jun. 30, 2014 Loan Repurchase Commitments [Member] Second Lien Residential Mortgage Backed Securities And Reserves [Member] Ineligible Loan Recoveries [Member] | Dec. 31, 2013 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ABS CDO exposure decrease since December 31,2007 |  |  |  |  | 97.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate ABS CDO Loss And LAE Reserves |  |  |  |  |  |  |  | $ 92 | $ 115 | $ 235 | $ 226 |  |  |  |  |  |  |  |  |  |
Policyholder (Benefits) And Claims Incurred Net | 12 | 188 | 62 | (6) | (17) | 72 | 27 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Elimination of loss and LAE expense (benefit) as result of consolidating VIE |  |  |  |  | 9 | (1) | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves for expected future claim payments |  |  |  |  |  |  |  |  |  |  |  | 713 | 847 |  |  |  |  |  |  |  |
Expected recoveries of future payments |  |  |  |  |  |  |  |  |  |  |  | 159 | 206 | 159 | 206 |  |  |  |  |  |
Weighted average risk-free rate used to discount claim liability |  |  | 2.01% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total estimated insurance recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 363 | 359
Insurance claim loss recoverable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 619 | 694 |  |
Insurance loss recoverable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 624 | 694 | 624 | 694 |  |
Losses and LAE related to expected payments |  |  | $ 2 |  |  | $ 19 | $ 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Elimination Of Loss And LAE Expense As Result Of Consolidating VIEs + 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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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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Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- 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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