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Fair Value Of Financial Instruments (Fair Value And Carrying Value Of Assets And Liabilities That Are Disclosed At Fair Value But Not Reported At Fair Value On Company's Consolidated Balance Sheets) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Variable Interest Entity [Member] |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Variable interest entity notes | $ 7,124 | [1] | $ 8,697 |
Long-term debt |  |  | 360 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Other investments | 9 |  | 11 |
Accrued investment income | 43 | [2] | 63 | [2]
Receivable for investments sold | 17 | [2] | 32 | [2]
Net cash collateral pledged | 66 | [2] |  |
Total assets | 2,809 |  | 3,595 |
Investment agreements | 1,175 |  | 1,853 |
Medium-term notes | 1,026 |  | 1,187 |
Securities sold under agreements to repurchase |  |  | 286 |
Long-term debt | 692 |  | 1,117 |
Payable for investments purchased | 50 | [3] | 3 | [3]
Accrued interest payable |  |  | 71 | [3]
Accrued interest expense | 19 | [3] |  |
Total liabilities | 6,109 |  | 8,182 |
Gross | 650 |  | 1,451 |
Ceded | 97 |  | 94 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Variable Interest Entity [Member] |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Variable interest entity notes | 3,147 |  | 3,297 |
Investments held-to-maturity | 2,674 |  | 3,489 |
Long-term debt |  |  | 368 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Accrued investment income | 43 | [2] | 63 | [2]
Receivable for investments sold | 17 | [2] | 32 | [2]
Net cash collateral pledged | 66 | [2] |  |
Total assets | 126 |  | 95 |
Payable for investments purchased | 50 | [3] | 3 | [3]
Accrued interest payable |  |  | 10 | [3]
Accrued interest expense | 9 | [3] |  |
Total liabilities | 59 |  | 13 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Securities sold under agreements to repurchase |  |  | 286 |
Long-term debt | 692 |  | 1,117 |
Accrued interest payable |  |  | 61 | [3]
Accrued interest expense | 10 | [3] |  |
Total liabilities | 702 |  | 1,464 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Other investments | 9 |  | 11 |
Total assets | 2,683 |  | 3,500 |
Investment agreements | 1,175 |  | 1,853 |
Medium-term notes | 1,026 |  | 1,187 |
Total liabilities | 5,348 |  | 6,705 |
Gross | 650 |  | 1,451 |
Ceded | 97 |  | 94 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] | Variable Interest Entity [Member] |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Variable interest entity notes | 3,147 |  | 3,297 |
Investments held-to-maturity | 2,674 |  | 3,489 |
Long-term debt |  |  | 368 |
Carrying Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Other investments | 9 |  | 11 |
Accrued investment income | 43 | [2] | 63 | [2]
Receivable for investments sold | 17 | [2] | 32 | [2]
Net cash collateral pledged | 66 | [2] |  |
Total assets | 2,964 |  | 3,949 |
Investment agreements | 944 |  | 1,578 |
Medium-term notes | 1,598 |  | 1,491 |
Securities sold under agreements to repurchase |  |  | 287 |
Long-term debt | 1,662 |  | 1,840 |
Payable for investments purchased | 50 | [3] | 3 | [3]
Accrued interest payable |  |  | 71 | [3]
Accrued interest expense | 70 | [3] |  |
Total liabilities | 7,789 |  | 9,573 |
Gross | 143 |  | 1,305 |
Ceded | 91 |  | 104 |
Carrying Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Variable Interest Entity [Member] |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |
Variable interest entity notes | 3,465 |  | 3,943 |
Investments held-to-maturity | 2,829 |  | 3,843 |
Long-term debt |  |  | $ 360 |
[1] | Includes $3.7 billion of VIE notes accounted for at fair value as of December 31, 2012.
[2] | Reported within "Other assets" on MBIA's consolidated balance sheets.
[3] | Reported within "Other liabilities" on MBIA's consolidated balance sheets.

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- Definition The fair value of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities more than one year from the balance sheet date or operating cycle, if longer; such investments are normally measured at amortized cost (carrying value) unless circumstances indicate that the value to be recovered from the investment is less than its carried amount. The held-to-maturity category is for those securities that the Company has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 7-11 -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
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. The amount of securities that an institution sells and agrees to repurchase (seller-borrower) at a specified date for a specified price, net of any reductions or offsets. Most repurchase agreements involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit (CDs), are sometimes used in repurchase agreements. A repurchase agreement is similar to the seller-borrower's borrowing funds equal to the sales price of the related securities with the securities as collateral. Maturities of such agreements are flexible and generally vary from one day to 270 days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 4 -IssueDate 2006-05-01 -Chapter 14 -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
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