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Variable Interest Entities (Summary Of Nonconsolidated VIEs Assets And Liabilities) (Detail) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Insurance loss recoverable |  | $ 409 | $ 577
Global Structured Finance [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE Assets |  | 26,237 | 28,311
Maximum Exposure to Loss |  | 13,215 | 14,495
Investments | [1] | 73 | 74
Premiums receivable | [2] | 71 | 80
Insurance loss recoverable | [3] | 401 | 418
Unearned premium revenue | [4] | 68 | 78
Loss and loss adjustment expense reserves | [5] | 414 | 418
Derivative liabilities | [6] | 4 | 6
Global Structured Finance [Member] | Collateralized Debt Obligations [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE Assets |  | 5,071 | 5,712
Maximum Exposure to Loss |  | 2,554 | 3,046
Investments | [1] | 51 | 51
Premiums receivable | [2] | 6 | 9
Unearned premium revenue | [4] | 3 | 6
Loss and loss adjustment expense reserves | [5] | 71 | 108
Derivative liabilities | [6] | 4 | 6
Global Structured Finance [Member] | Residential Mortgage Backed Securities [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE Assets |  | 11,066 | 11,524
Maximum Exposure to Loss |  | 5,817 | 6,072
Investments | [1] | 22 | 23
Premiums receivable | [2] | 31 | 31
Insurance loss recoverable | [3] | 399 | 416
Unearned premium revenue | [4] | 30 | 30
Loss and loss adjustment expense reserves | [5] | 334 | 306
Global Structured Finance [Member] | Commercial Mortgage Backed Securities [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE Assets |  | 309 | 319
Maximum Exposure to Loss |  | 206 | 219
Premiums receivable | [2] | 1 | 1
Unearned premium revenue | [4] | 0 | 1
Global Structured Finance [Member] | Consumer Asset Backed [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE Assets |  | 5,370 | 5,538
Maximum Exposure to Loss |  | 1,535 | 1,712
Premiums receivable | [2] | 9 | 13
Unearned premium revenue | [4] | 7 | 11
Loss and loss adjustment expense reserves | [5] | 9 | 4
Global Structured Finance [Member] | Corporate Asset Backed [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE Assets |  | 4,421 | 5,218
Maximum Exposure to Loss |  | 3,103 | 3,446
Premiums receivable | [2] | 24 | 26
Insurance loss recoverable | [3] | 2 | 2
Unearned premium revenue | [4] | 28 | 30
Global Public Finance [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE Assets |  | 47,741 | 44,162
Maximum Exposure to Loss |  | 14,291 | 14,579
Premiums receivable | [2] | 154 | 160
Unearned premium revenue | [4] | 179 | 186
Total Insurance [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
VIE Assets |  | 73,978 | 72,473
Maximum Exposure to Loss |  | 27,506 | 29,074
Investments | [1] | 73 | 74
Premiums receivable | [2] | 225 | 240
Insurance loss recoverable | [3] | 401 | 418
Unearned premium revenue | [4] | 247 | 264
Loss and loss adjustment expense reserves | [5] | 414 | 418
Derivative liabilities | [6] | $ 4 | $ 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 Carrying amount as of the balance sheet date of paid insurance policy claims and LAE expense expected to be recovered. + References No definition available. + Details
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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 Sum of the carrying amounts as of the balance sheet date of all investments. + 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 210.7-03.1(h)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + 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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