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Debt (Long-Term Debt) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jan. 16, 2008
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | $ 592 us-gaap_DebtInstrumentCarryingAmount |  | $ 592 us-gaap_DebtInstrumentCarryingAmount |  |
Surplus notes outstanding | 940 us-gaap_SurplusNotes | [1] | 940 us-gaap_SurplusNotes | [1] | 1,000 us-gaap_SurplusNotes
Total | 1,810 us-gaap_LongTermDebtNoncurrent |  | 1,702 us-gaap_LongTermDebtNoncurrent |  |
6.400% Senior Notes Due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 266 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_SixPointFourZeroZeroPercentageSeniorNotesDueTwoThousandTwentyTwoMember | [2] | 266 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_SixPointFourZeroZeroPercentageSeniorNotesDueTwoThousandTwentyTwoMember | [2] |
Long-term debt, interest rate | 6.40%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mbi_SixPointFourZeroZeroPercentageSeniorNotesDueTwoThousandTwentyTwoMember |  |  |  |
Long-term debt, maturity year | 2022 |  |  |  |
Initial Callable date | Aug. 15, 2006 |  |  |  |
7.000% Debentures Due 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 56 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_SevenPointZeroZeroZeroPercentageDebenturesDueTwoThousandTwentyFiveMember |  | 56 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_SevenPointZeroZeroZeroPercentageDebenturesDueTwoThousandTwentyFiveMember |  |
Long-term debt, interest rate | 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mbi_SevenPointZeroZeroZeroPercentageDebenturesDueTwoThousandTwentyFiveMember |  |  |  |
Long-term debt, maturity year | 2025 |  |  |  |
7.150% Debentures Due 2027 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 100 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_SevenPointOneFiveZeroPercentageDebenturesDueTwoThousandTwentySevenMember |  | 100 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_SevenPointOneFiveZeroPercentageDebenturesDueTwoThousandTwentySevenMember |  |
Long-term debt, interest rate | 7.15%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mbi_SevenPointOneFiveZeroPercentageDebenturesDueTwoThousandTwentySevenMember |  |  |  |
Long-term debt, maturity year | 2027 |  |  |  |
6.625% Debentures Due 2028 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 141 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_SixPointSixTwoFivePercentageDebenturesDuetwothousandtwentyEightMember |  | 141 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_SixPointSixTwoFivePercentageDebenturesDuetwothousandtwentyEightMember |  |
Long-term debt, interest rate | 6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mbi_SixPointSixTwoFivePercentageDebenturesDuetwothousandtwentyEightMember |  |  |  |
Long-term debt, maturity year | 2028 |  |  |  |
5.700% Senior Notes Due 2034 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, gross | 21 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_FivePointSevenZeroZeroPercentageSeniorNotesDueTwoThousandThirtyFourMember | [3] | 21 us-gaap_DebtInstrumentCarryingAmount / us-gaap_DebtInstrumentAxis = mbi_FivePointSevenZeroZeroPercentageSeniorNotesDueTwoThousandThirtyFourMember | [3] |
Long-term debt, interest rate | 5.70%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mbi_FivePointSevenZeroZeroPercentageSeniorNotesDueTwoThousandThirtyFourMember |  |  |  |
Long-term debt, maturity year | 2034 |  |  |  |
14% Surplus Notes Due 2033 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Accrued interest | 278 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mbi_FourteenPercentageSurplusNotesDueTwoThousandThirtyThreeMember |  | 170 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mbi_FourteenPercentageSurplusNotesDueTwoThousandThirtyThreeMember |  |
Long-term debt, interest rate | 14.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = mbi_FourteenPercentageSurplusNotesDueTwoThousandThirtyThreeMember |  |  |  |
Long-term debt, maturity year | 2033 |  |  |  |
Callable date for fifth anniversary of initial callable date | 2018-01-15 |  |  |  |
MBIA Inc Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Accrued interest | $ 8 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mbi_MbiaIncSeniorNotesMember |  | $ 8 us-gaap_InterestPayableCurrentAndNoncurrent / us-gaap_DebtInstrumentAxis = mbi_MbiaIncSeniorNotesMember |  |
[1] | Callable on or after January 15, 2018 and every fifth anniversary thereafter at 100.00.
[2] | Callable on or after August 15, 2006 at 100.00.
[3] | Callable anytime at the greater of 100.00 or the present value of the remaining scheduled payments of principal and interest.

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- Definition Earliest date before maturity when the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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