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Variable Interest Entities (Summary Of Nonconsolidated VIEs Assets And Liabilities) (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Collateralized Debt Obligations [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | $ 13,564 |  | $ 16,925 |
Maximum Exposure to Loss | 7,972 |  | 10,873 |
Investments | 118 | [1] | 0 | [1]
Premiums receivable | 45 | [2] | 62 | [2]
Insurance loss recoverable | 5 | [3] | 5 | [3]
Unearned premium revenue | 38 | [4] | 55 | [4]
Loss and loss adjustment expense reserves | 26 | [5] | 37 | [5]
Derivative liabilities | 94 | [6] | 74 | [6]
Residential Mortgage Backed Securities [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 22,400 |  | 34,061 |
Maximum Exposure to Loss | 9,915 |  | 13,075 |
Investments | 11 | [1] | 11 | [1]
Premiums receivable | 57 | [2] | 77 | [2]
Insurance loss recoverable | 696 | [3] | 3,278 | [3]
Unearned premium revenue | 56 | [4] | 75 | [4]
Loss and loss adjustment expense reserves | 374 | [5] | 440 | [5]
Derivative liabilities | 5 | [6] | 4 | [6]
Commercial Mortgage Backed Securities [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 2,010 |  | 4,801 |
Maximum Exposure to Loss | 1,102 |  | 2,432 |
Investments | 0 | [1] | 0 | [1]
Premiums receivable | 1 | [2] | 2 | [2]
Insurance loss recoverable | 0 | [3] | 0 | [3]
Unearned premium revenue | 1 | [4] | 2 | [4]
Loss and loss adjustment expense reserves | 0 | [5] | 0 | [5]
Derivative liabilities | 0 | [6] | 0 | [6]
Consumer Asset Backed [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 6,788 |  | 5,820 |
Maximum Exposure to Loss | 2,888 |  | 3,086 |
Investments | 9 | [1] | 10 | [1]
Premiums receivable | 21 | [2] | 19 | [2]
Insurance loss recoverable | 0 | [3] | 0 | [3]
Unearned premium revenue | 20 | [4] | 19 | [4]
Loss and loss adjustment expense reserves | 17 | [5] | 21 | [5]
Derivative liabilities | 0 | [6] | 0 | [6]
Corporate Asset Backed [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 14,258 |  | 19,980 |
Maximum Exposure to Loss | 7,817 |  | 9,981 |
Investments | 0 | [1] | 0 | [1]
Premiums receivable | 87 | [2] | 123 | [2]
Insurance loss recoverable | 19 | [3] | 13 | [3]
Unearned premium revenue | 103 | [4] | 140 | [4]
Loss and loss adjustment expense reserves | 0 | [5] | 0 | [5]
Derivative liabilities | 0 | [6] | 0 | [6]
Global Structured Finance [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 59,020 |  | 81,587 |
Maximum Exposure to Loss | 29,694 |  | 39,447 |
Investments | 138 | [1] | 21 | [1]
Premiums receivable | 211 | [2] | 283 | [2]
Insurance loss recoverable | 720 | [3] | 3,296 | [3]
Unearned premium revenue | 218 | [4] | 291 | [4]
Loss and loss adjustment expense reserves | 417 | [5] | 498 | [5]
Derivative liabilities | 99 | [6] | 78 | [6]
Global Public Finance [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 51,060 |  | 39,259 |
Maximum Exposure to Loss | 20,258 |  | 21,346 |
Investments | 0 | [1] | 0 | [1]
Premiums receivable | 205 | [2] | 220 | [2]
Insurance loss recoverable | 0 | [3] | 0 | [3]
Unearned premium revenue | 250 | [4] | 267 | [4]
Loss and loss adjustment expense reserves | 5 | [5] | 4 | [5]
Derivative liabilities | 0 | [6] | 0 | [6]
Total Insurance [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets | 110,080 |  | 120,846 |
Maximum Exposure to Loss | 49,952 |  | 60,793 |
Investments | 138 | [1] | 21 | [1]
Premiums receivable | 416 | [2] | 503 | [2]
Insurance loss recoverable | 720 | [3] | 3,296 | [3]
Unearned premium revenue | 468 | [4] | 558 | [4]
Loss and loss adjustment expense reserves | 422 | [5] | 502 | [5]
Derivative liabilities | $ 99 | [6] | $ 78 | [6]
[1] | Reported within "Investments" on MBIA's consolidated balance sheets.
[2] | Reported within "Premiums receivable" on MBIA's consolidated balance sheets.
[3] | Reported within "Insurance loss recoverable" on MBIA's consolidated balance sheets.
[4] | Reported within "Unearned premium revenue" on MBIA's consolidated balance sheets.
[5] | Reported within "Loss and loss adjustment expense reserves" on MBIA's consolidated balance sheets.
[6] | Reported within "Derivative liabilities" on MBIA's consolidated balance sheets.

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + 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=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
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- Definition The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts. + References Reference 1: 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.(a),5) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 5 -Article 7 + Details
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