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Business Segments (Summary Of Premiums Earned On Financial Guarantees And Insured Derivatives By Geographic Location Of Risk) (Details) (USD $) In Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | $ 199 | $ 169 | $ 544 | $ 537
United States [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | 161 | 133 | 413 | 416
United Kingdom [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | 10 | 5 | 27 | 26
Europe (Excluding United Kingdom) [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | 4 | 4 | 25 | 17
Internationally Diversified [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | 9 | 11 | 27 | 29
Central And South America [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | 9 | 10 | 28 | 30
Asia [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | 2 | 4 | 14 | 11
Other [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total premiums earned | $ 4 | $ 2 | $ 10 | $ 8

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- Definition Premiums Earned Net Financial Guarantee Insurance Contracts And Insured Derivatives + Details
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Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration