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Business, Developments, Risks And Uncertainties, Liquidity (Change In Credit Spreads Asset/Liability Products Operations) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011
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200 Basis Point Decrease [Member] |
Estimated change in fair value | $ 266
50 Basis Point Decrease [Member] |
Estimated change in fair value | 75
50 Basis Point Increase [Member] |
Estimated change in fair value | (71)
200 Basis Point Increase [Member] |
Estimated change in fair value | $ (265)

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- Definition Estimated change in fair value + References No definition available. + Details
Name: | mbi_EstimatedChangeInFairValue
Namespace Prefix: | mbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant