XML 83 R99.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Income Taxes (Income before Income Taxes) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income (loss) before income taxes | $ 641 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | $ 416 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | $ 1,598 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Domestic [Member] |  |  |
Income (loss) before income taxes | 574 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / mbi_IncomeBeforeIncomeTaxesAxis = mbi_DomesticMember | 435 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / mbi_IncomeBeforeIncomeTaxesAxis = mbi_DomesticMember | 1,486 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / mbi_IncomeBeforeIncomeTaxesAxis = mbi_DomesticMember
Foreign [Member] |  |  |
Income (loss) before income taxes | $ 67 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / mbi_IncomeBeforeIncomeTaxesAxis = mbi_ForeignMember | $ (19)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / mbi_IncomeBeforeIncomeTaxesAxis = mbi_ForeignMember | $ 112 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / mbi_IncomeBeforeIncomeTaxesAxis = mbi_ForeignMember

X
- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | mbi_IncomeBeforeIncomeTaxesAxis=mbi_DomesticMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mbi_IncomeBeforeIncomeTaxesAxis=mbi_ForeignMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |