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Loss And Loss Adjustment Expense Reserves (RMBS Reserves) (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  |  |  |  | 3 Months Ended |  |  | 3 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 24 Months Ended | 6 Months Ended |  |  | 3 Months Ended |  |  |  |  |  |  |  |  |
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Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Loss And Lae Reserves [Member] | Dec. 31, 2013 Loss And Lae Reserves [Member] | Mar. 31, 2014 Classified [Member] Loss And Lae Reserves [Member] | Dec. 31, 2013 Classified [Member] Loss And Lae Reserves [Member] | Mar. 31, 2014 First Lien R M B S Reserves [Member] | Mar. 31, 2014 First Lien R M B S Reserves [Member] Loss And Lae Reserves [Member] | Dec. 31, 2013 First Lien R M B S Reserves [Member] Loss And Lae Reserves [Member] | Dec. 31, 2013 First Lien R M B S Reserves [Member] Variable Interest Entity Primary Beneficiary [Member] | Mar. 31, 2014 First Lien R M B S Reserves [Member] ALT-A [Member] | Mar. 31, 2014 First Lien R M B S Reserves [Member] Foreclosure [Member] | Mar. 31, 2014 First Lien R M B S Reserves [Member] Real Estate Owned [Member] | Mar. 31, 2014 First Lien R M B S Reserves [Member] Bankruptcy [Member] | Feb. 28, 2014 Rmbs And Heloc And Ces [Member] | Mar. 31, 2014 Rmbs And Heloc And Ces [Member] | Aug. 31, 2014 Rmbs And Heloc And Ces [Member] | Sep. 30, 2014 Rmbs And Heloc And Ces [Member] Scenario Forecast [Member] | Aug. 31, 2014 Rmbs And Heloc And Ces [Member] Scenario Forecast [Member] | Aug. 31, 2014 Rmbs And Heloc And Ces [Member] Scenario Forecast [Member] Minimum [Member] | Feb. 29, 2016 Rmbs And Heloc And Ces [Member] Scenario Forecast [Member] Maximum [Member] | Aug. 31, 2014 Rmbs And Heloc And Ces [Member] Scenario Forecast [Member] Rate Reduction [Member] | Mar. 31, 2014 Rmbs And Heloc And Ces [Member] Excess Spread [Member] | Dec. 31, 2013 Rmbs And Heloc And Ces [Member] Excess Spread [Member] | Mar. 31, 2014 U S Public Finance Insurance [Member] | Dec. 31, 2013 U S Public Finance Insurance [Member] | Mar. 31, 2014 U S Public Finance Insurance [Member] General obligations | Dec. 31, 2013 U S Public Finance Insurance [Member] General obligations | Mar. 31, 2014 U S Public Finance Insurance [Member] General obligations Classified [Member] | Dec. 31, 2013 U S Public Finance Insurance [Member] General obligations Classified [Member] | Mar. 31, 2014 Second Lien R M B S Securitizations [Member] Loss And Lae Reserves [Member] | Dec. 31, 2013 Second Lien R M B S Securitizations [Member] Loss And Lae Reserves [Member] | Mar. 31, 2014 Second Lien R M B S Securitizations [Member] Variable Interest Entity Primary Beneficiary [Member] | Dec. 31, 2013 Second Lien R M B S Securitizations [Member] Variable Interest Entity Primary Beneficiary [Member]
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss and loss adjustment expense reserves |  |  |  |  |  | $ 602 | $ 641 | $ 602 | $ 641 |  | $ 246 | $ 241 | $ 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 62 | $ 87 |  |  |  |  | $ 109 | $ 126 | $ 38 | $ 43
Insurance loss recoverable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 626 | 647 | 9 | 13 |  |  |  |  |  |  |  |
Schedule Of Insured Financial Obligations With Credit Deterioration Insured Contractual Payments Outstanding Principal | 16,032 | [1] |  | 14,264 | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,100 | 124,900 | 161 | 161 |  |  |  |
Policyholder (Benefits) And Claims Incurred Net | 50 |  | (194) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14) |  |  |  |  |  |  |  |  |
Charged-off loans recovery values | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total excess spread recoveries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 651 | 681 |  |  |  |  |  |  |  |  |  |
Expected recoveries of future payments |  |  |  |  |  | 182 | 206 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 | 34 |  |  |  |  |  |  |  |  |  |
Assumed roll rate for loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% | 90.00% | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
90+ day roll rate to loss set stress scenario |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of roll to loss after declining over a 24-month period |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumed roll rate for ninety plus day delinquent loans excluding foreclosure and real estate owned |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of elevated delinquency and loss for base case, beginning, months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loans in 30-59 days delinquent bucket |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loans charged-off |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Current Roll to Loss for the transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in percentage of Current Roll to Loss for transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |  |
Current Roll to Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period of elevated delinquency and loss for stress case, additional months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 24 |  |  |  |  |  |  |  |  |  |  |  |  |
Addition to case basis reserves if losses remain at peak levels |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA.

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- Definition Assumed Roll Rate For Loans + References No definition available. + Details
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Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Assumed roll rate for ninety plus day delinquent loans exluding foreclosure and real estate owned + References No definition available. + Details
Name: | mbi_AssumedRollRateForNinetyPlusDayDelinquentLoansExcludingForeclosureAndRealEstateOwned
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Charged Off Loan Recovery Value + References No definition available. + Details
Name: | mbi_ChargedOffLoanRecoveryValue
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Decrease In Percentage Of Current Roll To Loss For Transaction + References No definition available. + Details
Name: | mbi_DecreaseInPercentageOfCurrentRollToLossForTransaction
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross reserve, recoveries on unpaid losses + References No definition available. + Details
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Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Increase Decrease To Case Basis Reserves + References No definition available. + Details
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Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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
Name: | mbi_InsuranceLossRecoverable
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | mbi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Current Roll To Loss For Transaction + References No definition available. + Details
Name: | mbi_PercentageOfCurrentRollToLossForTransaction
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Further Reduction Of Current Roll To Loss For Transaction + References No definition available. + Details
Name: | mbi_PercentageOfFurtherReductionOfCurrentRollToLossForTransaction
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Loans Charged Off + References No definition available. + Details
Name: | mbi_PercentageOfLoansChargedOff
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Loans In 30-59 Day Delinquent Bucket + References No definition available. + Details
Name: | mbi_PercentageOfLoansInThirtyToFiftyNineDayDelinquentBucket
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Loss After Declining Over Twenty Four Month Period + References No definition available. + Details
Name: | mbi_PercentageOfLossAfterDecliningOverTwentyFourMonthPeriod
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage Of Roll Rate To Loss Set + References No definition available. + Details
Name: | mbi_PercentageOfRollRateToLossSet
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Period Of Elevated Delinquency And Loss For Base Case, Beginning, Months + References No definition available. + Details
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Namespace Prefix: | mbi_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- Definition Period Of Elevated Delinquency And Loss For Stress Case, Additional Months + References No definition available. + Details
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Namespace Prefix: | mbi_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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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
Name: | us-gaap_EstimatedInsuranceRecoveries
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition This element represents the amount of insured contractual payments outstanding attributable to the principal of the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6933462&loc=SL5751133-161288 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)(5)(iii) -URI http://asc.fasb.org/extlink&oid=6933314&loc=SL5749324-161292 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant