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Fair Value Of Financial Instruments (Fair Value Hierarchy Table Presents The Company's Assets And Liabilities At Fair Value Not Recorded On The Company's Consolidated Balance Sheet) (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Investments held-to-maturity, fair value | $ 2,566 |  | $ 2,674 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 1 [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Other investments | 0 |  | 0 |
Accrued investment income | 44 | [1] | 43 | [1]
Receivable for investments sold | 23 | [1] | 17 | [1]
Net cash collateral pledged | 62 | [1] | 66 | [1]
Total assets | 129 |  | 126 |
Investment agreements | 0 |  | 0 |
Medium-term notes | 0 |  | 0 |
Securities Loaned Or Sold Under Agreements To Repurchase | 0 |  | 0 |
Long-term debt | 10 |  | 9 |
Payable for investments purchased | 150 | [2] | 50 | [2]
Secured loan | 0 | [3] |  |
Total liabilities | 160 |  | 59 |
Gross | 0 |  | 0 |
Ceded | 0 |  | 0 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 1 [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Variable interest entity notes | 0 |  | 0 |
Investments held-to-maturity, fair value | 0 |  | 0 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 2 [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Other investments | 0 |  | 0 |
Accrued investment income | 0 | [1] | 0 | [1]
Receivable for investments sold | 0 | [1] | 0 | [1]
Net cash collateral pledged | 0 | [1] | 0 | [1]
Total assets | 0 |  | 0 |
Investment agreements | 0 |  | 0 |
Medium-term notes | 0 |  | 0 |
Securities Loaned Or Sold Under Agreements To Repurchase | 0 |  | 0 |
Long-term debt | 1,282 |  | 702 |
Payable for investments purchased | 0 | [2] | 0 | [2]
Secured loan | 0 | [3] |  |
Total liabilities | 1,282 |  | 702 |
Gross | 0 |  | 0 |
Ceded | 0 |  | 0 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 2 [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Variable interest entity notes | 0 |  | 0 |
Investments held-to-maturity, fair value | 0 |  | 0 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 3 [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Other investments | 6 |  | 9 |
Accrued investment income | 0 | [1] | 0 | [1]
Receivable for investments sold | 0 | [1] | 0 | [1]
Net cash collateral pledged | 0 | [1] | 0 | [1]
Total assets | 2,572 |  | 2,683 |
Investment agreements | 902 |  | 1,175 |
Medium-term notes | 1,035 |  | 860 |
Securities Loaned Or Sold Under Agreements To Repurchase | 0 |  | 0 |
Long-term debt | 0 |  | 0 |
Payable for investments purchased | 0 | [2] | 0 | [2]
Secured loan | 50 | [3] |  |
Total liabilities | 4,676 |  | 5,182 |
Gross | 3,097 |  | 650 |
Ceded | 69 |  | 97 |
Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Fair Value Inputs Level 3 [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Variable interest entity notes | 2,689 |  | 3,147 |
Investments held-to-maturity, fair value | 2,566 |  | 2,674 |
Carrying Reported Amount Fair Value Disclosure [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Other investments | 6 |  | 9 |
Accrued investment income | 44 | [1] | 43 | [1]
Receivable for investments sold | 23 | [1] | 17 | [1]
Net cash collateral pledged | 62 | [1] | 66 | [1]
Total assets | 2,944 |  | 2,964 |
Investment agreements | 760 |  | 944 |
Medium-term notes | 1,350 |  | 1,433 |
Securities Loaned Or Sold Under Agreements To Repurchase | 0 |  | 0 |
Long-term debt | 1,677 |  | 1,732 |
Payable for investments purchased | 150 | [2] | 50 | [2]
Secured loan | 50 | [3] |  |
Total liabilities | 6,946 |  | 7,624 |
Gross | 2,490 |  | 143 |
Ceded | 77 |  | 91 |
Carrying Reported Amount Fair Value Disclosure [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Variable interest entity notes | 2,959 |  | 3,465 |
Investments held-to-maturity, fair value | 2,809 |  | 2,829 |
Fair 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 | 6 |  | 9 |
Accrued investment income | 44 | [1] | 43 | [1]
Receivable for investments sold | 23 | [1] | 17 | [1]
Net cash collateral pledged | 62 | [1] | 66 | [1]
Total assets | 2,701 |  | 2,809 |
Investment agreements | 902 |  | 1,175 |
Medium-term notes | 1,035 |  | 860 |
Securities Loaned Or Sold Under Agreements To Repurchase | 0 |  | 0 |
Long-term debt | 1,292 |  | 711 |
Payable for investments purchased | 150 | [2] | 50 | [2]
Secured loan | 50 | [3] |  |
Total liabilities | 6,118 |  | 5,943 |
Gross | 3,097 |  | 650 |
Ceded | 69 |  | 97 |
Fair Value [Member] | Value Disclosed At Fair Value Not Recorded At Fair Value [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |  |  |
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items] |  |  |  |
Variable interest entity notes | 2,689 |  | 3,147 |
Investments held-to-maturity, fair value | $ 2,566 |  | $ 2,674 |
[1] | Reported within "Other assets" on MBIA's consolidated balance sheets.
[2] | Reported within "Other liabilities" on MBIA's consolidated balance sheets.
[3] | Unobservable inputs are either not developed by the Company or do not significantly impact the overall fair values of the aggregate financial assets and liabilities.

X
- Definition Cash Collateral Pledge + References No definition available. + Details
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- Definition Represents the Company's balance sheet carrying amount of the financial guarantee insurance contracts ceded to third party reinsurers. The balance sheet carrying amount comprises the prepaid reinsurance premiums and reinsurance recoverable on paid and unpaid losses + References No definition available. + Details
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- Definition Represents the Company's balance sheet carrying amount of the financial guarantee insurance contract obligations with third parties. The gross balance sheet carrying amount comprises the unearned premium revenue and the loss and loss adjustment expense reserves balances + References No definition available. + Details
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- Definition Payable for investments purchased fair value disclosure + References No definition available. + Details
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- Definition Receivable for investments sold. + References No definition available. + Details
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- Definition Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 7 + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a nonrecurring basis by the entity. + References No definition available. + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fair value amount of long-term debt 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. + References No definition available. + Details
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- Definition Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + 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 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 + Details
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- Definition Other investments not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
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