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Business Developments, Risks And Uncertainties, And Liquidity (Narrative) (Detail) (USD $) | 1 Months Ended | 9 Months Ended | 12 Months Ended | 6 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  | 9 Months Ended |  |  |  |  |  | 9 Months Ended |  |  |  | 9 Months Ended |  | 9 Months Ended
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Sep. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | Jun. 30, 2012 MBIA Corp [Member] | Sep. 30, 2012 MBIA Corp [Member] | Dec. 31, 2011 MBIA Corp [Member] | Sep. 30, 2012 National [Member] | Dec. 31, 2011 National [Member] | Dec. 31, 2010 National [Member] | Sep. 30, 2012 MBIA Inc. [Member] | Dec. 31, 2011 MBIA Inc. [Member] | Sep. 30, 2012 MBIA Inc General Corporate Purposes [Member] | Dec. 31, 2011 MBIA Inc General Corporate Purposes [Member] | Sep. 30, 2012 MBIA Inc Total [Member] | Dec. 31, 2011 MBIA Inc Total [Member] | Sep. 30, 2012 Maximum Amount [Member] | Sep. 30, 2012 Utilized Amount [Member] MBIA Inc. [Member] | Sep. 30, 2012 October One Two Thousand And Seven To September Thirty Two Thousand And Twelve [Member] | Sep. 30, 2012 October One Two Thousand And Seven To September Thirty Two Thousand And Twelve [Member] MBIA Corp [Member] | Sep. 30, 2012 Asset Swap [Member] MBIA Inc. [Member] | Sep. 30, 2012 Asset/Liability Products [Member] | Dec. 31, 2011 Asset/Liability Products [Member] | Sep. 30, 2012 Asset/Liability Products [Member] MBIA Inc. [Member] | Dec. 31, 2011 Asset/Liability Products [Member] MBIA Inc. [Member] | Sep. 30, 2012 CMBS Pool Insured Gross Par [Member] | Sep. 30, 2012 CRE CDO [Member] | Sep. 30, 2012 CRE Loan Pools [Member] | Sep. 30, 2012 CMBS Pool And CRE CDO Gross Par Exposure Decrease Since 2007 [Member] | Sep. 30, 2012 ABS CDO [Member] | Sep. 30, 2012 ABS CDO Gross Par Exposure Decrease Since 2007 [Member] | Sep. 30, 2012 Fair Value Of The Collateral Pledged By MBIA Inc [Member] | Sep. 30, 2012 Net Average Interest Rate [Member] | Sep. 30, 2011 Net Average Interest Rate [Member] | Sep. 30, 2012 Fair Value Of Collateral Pledged By National [Member] Asset Swap [Member] | Sep. 30, 2012 Notional Amount Utilized [Member] | Dec. 31, 2008 Maximum Amount At Inception [Member] | Sep. 30, 2012 Maximum Amount At Inception [Member] MBIA Corp [Member] | Sep. 30, 2012 Interest Rate [Member] MBIA Corp [Member] | Sep. 30, 2012 Borrowing Limit [Member] | Sep. 30, 2012 Consolidated VIEs [Member] October One Two Thousand And Seven To September Thirty Two Thousand And Twelve [Member] MBIA Corp [Member] | Sep. 30, 2012 Second-Lien RMBS Securitizations [Member] October One Two Thousand And Seven To September Thirty Two Thousand And Twelve [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liquid asset |  |  |  |  |  | $ 386,000,000 | $ 534,000,000 | $ 318,000,000 | $ 703,000,000 |  | $ 432,000,000 | $ 386,000,000 | $ 335,000,000 | $ 226,000,000 | $ 432,000,000 | $ 386,000,000 |  |  |  |  |  | $ 97,000,000 | $ 160,000,000 | $ 97,000,000 | $ 160,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Claims payments |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commuted gross insured exposure |  |  |  |  | 12,800,000,000 | 13,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of recognized estimated recoveries in relationship to consolidated total shareholders equity | 82.00% | 82.00% |  | 119.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal statutory rate |  | 35.00% | 35.00% | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ineligible mortgage loan recoveries of statutory capital | 144.00% | 144.00% |  | 89.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated insurance recoveries, after income taxes | 2,100,000,000 | 2,100,000,000 |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance par exposure | 33,100,000,000 | 33,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,700,000,000 | 2,200,000,000 | 2,800,000,000 | 36,100,000,000 | 4,400,000,000 | 32,900,000,000 |  |  |  |  |  |  |  |  |  |  |
Shareholders equity | 2,565,000,000 | 2,565,000,000 |  | 1,700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Statutory capital |  |  |  |  |  | 1,500,000,000 |  | 3,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingency reserve release to surplus | 196,000,000 | 196,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Qualifying asset shortfall | 97,000,000 | 97,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate risk limits exceeded under NYIL |  | 47,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Secured Loan |  |  |  |  |  |  |  | 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MBIA Secured Loan, average interest rate |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.51% |  |  |
MBIA Corp Secured Loan |  |  |  |  |  |  |  | 1,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000 |  |  |  |
Additional borrowing under National Secured Loan |  |  |  |  |  |  |  | 443,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of collateral pledged |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 558,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 535,000,000 |  |  |  |  |  |  |
National Asset Swap |  |  |  |  |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 522,000,000 |  |  |  |  |  |
National asset swap, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.56% | 0.34% |  |  |  |  |  |  |  |
Secured loan balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  |
Approved secured loan maximum outstanding amount | 450,000,000 | 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 450,000,000 |  |
Conduit Repurchase Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000 | 51,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 63,000,000 |  |  |  |  |  |  |  |  |  |
Conduit Repurchase Agreement, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.48% |  |  |  |  |  |  |  |  |
Payment on tax agreement related to estimated taxes |  | 95,000,000 |  |  |  |  |  |  | 11,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Escrow through tax years | 365,000,000 | 365,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Invested assets at amortized cost to liabilities at amortized cost issued to third-parties and affiliates at amortized cost | 980,000,000 | 980,000,000 |  | 591,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of sensitivity range | The table presents hypothetical increases and decreases in credit spreads of 50 and 200 basis points |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payments for second lien RMBS securitizations and CDS contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 893,000,000 |
Cash payments for second lien RMBS securitization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,600,000,000
Gross settlement and claim payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess interest cash flows from securitizations |  | 185,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ineligible mortgage loans from securitizations, related expected recoveries | 3,200,000,000 | 3,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held cash and available-for-sale investments |  |  |  |  |  | 1,400,000,000 | 1,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and short-term investments |  |  |  |  |  |  |  | $ 356,000,000 | $ 771,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate risk limits exceeded under New York Insurance Law (NYIL). + References No definition available. + Details
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- Definition Invested assets at amortized cost to debt issued to third-parties and affiliates at amortized cost. + References No definition available. + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -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 Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=6889476&loc=d3e330036-122817 + Details
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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