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Variable Interest Entities (Summary Of Nonconsolidated VIEs Assets And Liabilities) (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |
Premiums receivable |  | $ 409 | $ 792 | $ 875
Derivative liabilities |  | 66 | 88 |
Global Structured Finance [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets |  | 20,088 | 28,311 |
Maximum Exposure to Loss |  | 10,391 | 14,495 |
Investments | [1] | 76 | 74 |
Premiums receivable | [2] | 55 | 80 |
Insurance loss recoverable | [3] | 306 | 418 |
Unearned premium revenue | [4] | 52 | 78 |
Loss and loss adjustment expense reserves | [5] | 406 | 418 |
Derivative liabilities | [6] | 0 | 6 |
Global Structured Finance [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets |  | 3,167 | 5,712 |
Maximum Exposure to Loss |  | 1,914 | 3,046 |
Investments | [1] | 51 | 51 |
Premiums receivable | [2] | 2 | 9 |
Unearned premium revenue | [4] | 0 | 6 |
Loss and loss adjustment expense reserves | [5] | 73 | 108 |
Derivative liabilities | [6] | 0 | 6 |
Global Structured Finance [Member] | Residential Mortgage Backed Securities [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets |  | 9,146 | 11,524 |
Maximum Exposure to Loss |  | 4,796 | 6,072 |
Investments | [1] | 20 | 23 |
Premiums receivable | [2] | 28 | 31 |
Insurance loss recoverable | [3] | 304 | 416 |
Unearned premium revenue | [4] | 27 | 30 |
Loss and loss adjustment expense reserves | [5] | 325 | 306 |
Global Structured Finance [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets |  | 257 | 319 |
Maximum Exposure to Loss |  | 145 | 219 |
Premiums receivable | [2] | 0 | 1 |
Unearned premium revenue | [4] | 0 | 1 |
Global Structured Finance [Member] | Consumer Asset Backed [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets |  | 4,893 | 5,538 |
Maximum Exposure to Loss |  | 1,331 | 1,712 |
Premiums receivable | [2] | 7 | 13 |
Insurance loss recoverable | [3] | 2 |  |
Unearned premium revenue | [4] | 5 | 11 |
Loss and loss adjustment expense reserves | [5] | 8 | 4 |
Global Structured Finance [Member] | Corporate Asset Backed [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets |  | 2,625 | 5,218 |
Maximum Exposure to Loss |  | 2,205 | 3,446 |
Investments | [1] | 5 |  |
Premiums receivable | [2] | 18 | 26 |
Insurance loss recoverable | [3] | 0 | 2 |
Unearned premium revenue | [4] | 20 | 30 |
Global Public Finance [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets |  | 44,306 | 44,162 |
Maximum Exposure to Loss |  | 12,051 | 14,579 |
Premiums receivable | [2] | 11 | 160 |
Unearned premium revenue | [4] | 18 | 186 |
Total Insurance [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
VIE Assets |  | 64,394 | 72,473 |
Maximum Exposure to Loss |  | 22,442 | 29,074 |
Investments | [1] | 76 | 74 |
Premiums receivable | [2] | 66 | 240 |
Insurance loss recoverable | [3] | 306 | 418 |
Unearned premium revenue | [4] | 70 | 264 |
Loss and loss adjustment expense reserves | [5] | 406 | 418 |
Derivative liabilities | [6] | $ 0 | $ 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 liabilities 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 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: 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=49121117&loc=d3e13495-108611 Reference 3: 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=51824906&loc=SL20225862-175312 Reference 4: 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=49121117&loc=d3e13433-108611 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 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + 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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