XML 103 R82.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Debt (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
MBIA Inc. Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage | 5.70% |
Long-term debt, maturity year | 2034 |
MBIA Corp Surplus Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate terms | Contractual interest rate is based on the three month LIBOR plus 11.26%. Callable on or after January 15, 2023 and every fifth anniversary thereafter at par. |
Mbia Inc. Debentures [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage | 7.00% |
Long-term debt, maturity year | 2025 |
Medium Term Notes [Member] |  |
Debt Instrument [Line Items] |  |
Repurchase of MTNs | $ 78 |
Weighted average interest rate | 3.23% | 2.90%
Percent of par | 89.00% |
Investment Agreement Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 5.83% | 5.75%
MBIA Corp Financing Facility [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage | 14.00% |
Long-term debt, maturity date | Jan. 20, 2020 |
Commitment fees | $ 10 |
MBIA Corp Financing Facility [Member] | Initial [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt principal amount owned | 366 |
Proceeds from subordinated financing | 38 |
MBIA Corp Financing Facility [Member] | Undrawn [Member] |  |
Debt Instrument [Line Items] |  |
Proceeds from subordinated financing | 50 |
MBIA Corp Financing Facility [Member] | Outstanding [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt principal amount owned | 373 | $ 330
Mbia Inc [Member] | MBIA Corp Surplus Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt principal amount owned | 13 |
National [Member] | MBIA Inc. Senior Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt principal amount purchased | 44 | $ 129
Long-term debt principal amount owned | 308 |
National [Member] | Mbia Inc. Debentures [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt principal amount purchased | 10 |
Long-term debt principal amount owned | $ 10 |
Variable Interest Entity [Member] |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 6.91% | 6.01%
Maximum [Member] | Medium Term Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage | 6.00% | 6.00%
Maximum [Member] | Investment Agreement Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage | 6.88% | 6.88%
Maximum [Member] | Variable Interest Entity [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage | 14.00% | 14.00%
Minimum [Member] | Medium Term Notes [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage | 0.00% | 0.00%
Minimum [Member] | Investment Agreement Obligations [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage | 4.78% | 4.74%
Minimum [Member] | Variable Interest Entity [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument Interest Rate Stated Percentage | 2.81% | 1.85%

X
- Definition Debt instrument maturity year. + References No definition available. + Details
Name: | mbi_DebtInstrumentMaturityYear
Namespace Prefix: | mbi_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt instruments repurchased weighted average percent of par value. + References No definition available. + Details
Name: | mbi_DebtInstrumentRepurchasedPercentOfParValue
Namespace Prefix: | mbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateTerms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value amount of debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Face (par) amount of the original debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the charge against earnings during the period for commitment fees and debt issuance expenses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
Name: | us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfSubordinatedLongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mbi_MbiaIncSeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mbi_MbiaCorpSurplusNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=mbi_MbiaIncDebenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_MediumTermNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=mbi_InvestmentAgreementObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=mbi_MBIACorpFinancingFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=mbi_InitialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=mbi_UndrawnMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=mbi_OutstandingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=mbi_MbiaIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=mbi_NationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |