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Business Developments, Risks And Uncertainties, And Liquidity (Tables) | 9 Months Ended
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Sep. 30, 2012
Change In Credit Spreads (Asset/Liability Products Business) |
|  | Change in Credit Spreads (Asset/Liability Products Business) |
In millions |  | 200 Basis Point Decrease |  |  | 50 Basis Point Decrease |  |  | 50 Basis Point Increase |  |  | 200 Basis Point Increase |
Estimated change in fair value |  | $ | 149 |  |  | $ | 41 |  |  | $ | (37) |  |  | $ | (130) |

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- Definition Asset Liability Products Credit Spread Sensitivity [Table Text Block] + References No definition available. + Details
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Namespace Prefix: | mbi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration