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Recent Accounting Pronouncements (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2010
Retained Earnings [Member] |
Cumulative transition adjustment, net of tax, adjusted to beginning retained earnings, consolidated VIEs | $ 319
Cumulative transition adjustment, net of tax, adjusted to beginning retained earnings, deconsolidated VIEs | 3
Cumulative transition adjustment, net of deferred taxes, adjusted to accumulated other comprehensive loss | (322)
Accumulated Other Comprehensive Income (Loss) [Member] |
Cumulative transition adjustment, net of tax, adjusted to beginning retained earnings, consolidated VIEs | (264)
Cumulative transition adjustment, net of tax, adjusted to beginning retained earnings, deconsolidated VIEs | (85)
Cumulative transition adjustment, net of deferred taxes, adjusted to accumulated other comprehensive loss | $ 349

X
- Definition Transition adjustment related to consolidated variable interest entities, net of tax, included in retained earnings. + References No definition available. + Details
Name: | mbi_ConsolidatedVariableInterestEntityNetOfTax
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Transition adjustment related to deconsolidating variable interest entities, net of tax, included in retained earnings. + References No definition available. + Details
Name: | mbi_DeconsolidatedVariableInterestEntityNetOfTax
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Total accounting standards update transition adjustment. + References No definition available. + Details
Name: | mbi_TotalAccountingStandardsUpdateTransitionAdjustment
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration