XML 17 R71.htm IDEA: XBRL DOCUMENT
v2.3.0.15

Derivative Instruments (Narrative) (Details) (USD $) | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Derivative [Line Items] |  |  |  |
Maximum amount of future guarantee payments | $ 92,700,000,000 |  |  |
Derivatives ceded under reinsurance agreements and capital market transactions | 177,000,000 |  |  |
Fair value of derivative assets before counterparty netting | 815,000,000 |  | 769,000,000 | [1]
Derivative assets after counterparty netting | 724,000,000 |  | 708,000,000 |
Fair value of derivative liabilities before counterparty netting |  |  | 6,798,000,000 | [1]
Derivative assets and derivative assets - VIEs after counterparty netting and embedded reclasses | 715,000,000 |  | 703,000,000 |
Derivative liabilities after counterparty netting | 7,200,000,000 |  | 6,700,000,000 |
Fair value of securities posted to derivative counterparties | 496,000,000 |  | 452,000,000 |
Fair value of Credit Support Annexes | 2,000,000 |  | 4,000,000 |
Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Fair value of derivative liabilities before counterparty netting | $ 7,272,000,000 | [1] |  |
[1] | In accordance with the accounting guidance for derivative instruments and hedging activities, the balance sheet location of the Company's embedded derivative instruments is determined by the location of the related host contract.

X
- Definition Derivative Fair Value Of Derivative Asset Net Of Counterparty Netting + Details
Name: | mbi_DerivativeFairValueOfDerivativeAssetNetOfCounterpartyNetting
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivative Fair Value Of Derivative Assets Reported In Derivative Assets And Derivative Assets VIEs Net Of Counterparty Netting And Embedded Reclasses + Details
Name: | mbi_DerivativeFairValueOfDerivativeAssetsReportedInDerivativeAssetsAndDerivativeAssetsVieNetOfCounterpartyNettingAndEmbeddedReclasses
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivative Fair Value Of Derivative Liability Net Of Counterparty Netting + Details
Name: | mbi_DerivativeFairValueOfDerivativeLiabilityNetOfCounterpartyNetting
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Derivatives Ceded Under Reinsurance Agreements + Details
Name: | mbi_DerivativesCededUnderReinsuranceAgreements
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair Value of Credit Support Annexes + Details
Name: | mbi_FairValueOfCreditSupportAnnexes
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees after (net of) reduction for potential recoveries under recourse or collateralization provisions. + Details
Name: | mbi_GuaranteeObligationsMaximumNetExposure
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Securities Pledged As Collateral To Derivative Counterparties + Details
Name: | mbi_SecuritiesPledgedAsCollateralToDerivativeCounterparties
Namespace Prefix: | mbi
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeAsset
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeLiability
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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_DerivativeLineItems
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration