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Loss And Loss Adjustment Expense Reserves (Schedule Of Financial Guarantees And Related Claim Liability) (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) issue policy | Dec. 31, 2017 USD ($) issue policy
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Number of policies | policy |  | 367 | 375
Number of issues | issue | [1] | 139 | 144
Remaining weighted average contract period (in years) |  | 8 years 9 months 18 days | 8 years 10 months 24 days
Principal | [2] | $ 8,617 | $ 8,964
Interest | [2] | 8,248 | 8,481
Total | [2] | 16,865 | 17,445
Gross claim liability | [3] | 1,107 | 1,082
Less: Gross potential recoveries | [4] | 878 | 782
Discount, net | [5] | (248) | (178)
Net claim liability (recoverable) |  | 477 | 478
Unearned premium revenue |  | $ 86 | $ 90
Caution List Low [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Number of policies | policy |  | 72 | 89
Number of issues | issue | [1] | 18 | 20
Remaining weighted average contract period (in years) |  | 7 years | 7 years 4 months 24 days
Principal | [2] | $ 2,371 | $ 2,764
Interest | [2] | 2,451 | 2,676
Total | [2] | 4,822 | 5,440
Gross claim liability | [3] | 0 | 0
Less: Gross potential recoveries |  | 0 | 0
Discount, net | [5] | 0 | 0
Net claim liability (recoverable) |  | 0 | 0
Unearned premium revenue |  | $ 7 | $ 9
Caution List Medium [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Number of policies | policy |  | 19 | 5
Number of issues | issue | [1] | 5 | 4
Remaining weighted average contract period (in years) |  | 8 years 6 months | 4 years 3 months 18 days
Principal | [2] | $ 159 | $ 13
Interest | [2] | 93 | 3
Total | [2] | 252 | 16
Gross claim liability | [3] | 0 | 0
Less: Gross potential recoveries |  | 0 | 0
Discount, net | [5] | 0 | 0
Net claim liability (recoverable) |  | 0 | 0
Unearned premium revenue |  | $ 1 | $ 0
Caution List High [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Number of policies | policy |  | 1 | 1
Number of issues | issue | [1] | 1 | 1
Remaining weighted average contract period (in years) |  | 8 years 4 months 24 days | 8 years 8 months 12 days
Principal | [2] | $ 104 | $ 104
Interest | [2] | 46 | 46
Total | [2] | 150 | 150
Gross claim liability | [3] | 0 | 0
Less: Gross potential recoveries |  | 0 | 0
Discount, net | [5] | 0 | 0
Net claim liability (recoverable) |  | 0 | 0
Unearned premium revenue |  | $ 3 | $ 4
Classified List [Member] |  |  |
Loss And Loss Adjustment Expense Reserves [Line Items] |  |  |
Number of policies | policy |  | 275 | 280
Number of issues | issue | [1] | 115 | 119
Remaining weighted average contract period (in years) |  | 9 years 7 months 6 days | 9 years 8 months 12 days
Principal | [2] | $ 5,983 | $ 6,083
Interest | [2] | 5,658 | 5,756
Total | [2] | 11,641 | 11,839
Gross claim liability | [3] | 1,107 | 1,082
Less: Gross potential recoveries | [4] | 878 | 782
Discount, net | [5] | (248) | (178)
Net claim liability (recoverable) |  | 477 | 478
Unearned premium revenue |  | $ 75 | $ 77
[1] | An “issue” represents the aggregate of financial guarantee policies that share the same revenue source for purposes of making debt service payments on the insured debt.
[2] | Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA.
[3] | The gross claim liability with respect to Puerto Rico exposures are net of expected recoveries for policies in a net payable position.
[4] | Gross potential recoveries with respect to certain Puerto Rico exposures are net of the claim liability for policies in a net recoverable position.
[5] | Represents discount related to Gross Claim Liability and Gross Potential Recoveries.

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- Definition Number Of Policies + References No definition available. + Details
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- Definition Remaining weighted average contract period of financial guarantee insurance contracts, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82853773&loc=SL5749324-161292 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=96866959&loc=SL5751133-161288 + Details
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- Definition This element represents the gross claim liability for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=96866959&loc=SL5751133-161288 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(iv) -URI http://asc.fasb.org/extlink&oid=82853773&loc=SL5749324-161292 + Details
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- Definition This element represents the amount of insured contractual payments outstanding on the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=96866959&loc=SL5751133-161288 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(iii) -URI http://asc.fasb.org/extlink&oid=82853773&loc=SL5749324-161292 + Details
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- Definition This element represents the amount of insured contractual payments outstanding attributable to interest accrued on the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=96866959&loc=SL5751133-161288 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(iii) -URI http://asc.fasb.org/extlink&oid=82853773&loc=SL5749324-161292 + Details
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- Definition This element represents the amount of insured contractual payments outstanding attributable to the principal of the underlying insured obligations for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(iii) -URI http://asc.fasb.org/extlink&oid=82853773&loc=SL5749324-161292 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=96866959&loc=SL5751133-161288 + Details
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- Definition This element represents the net claim liability related to financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=96866959&loc=SL5751133-161288 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(vii) -URI http://asc.fasb.org/extlink&oid=82853773&loc=SL5749324-161292 + Details
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- Definition This element represents the number of issued and outstanding contracts for each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(i) -URI http://asc.fasb.org/extlink&oid=82853773&loc=SL5749324-161292 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=96866959&loc=SL5751133-161288 + Details
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- Definition This element represents the gross potential recoveries against the gross claim liability for financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=96866959&loc=SL5751133-161288 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(v) -URI http://asc.fasb.org/extlink&oid=82853773&loc=SL5749324-161292 + Details
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- Definition This element represents the net discount consisting of the difference between the discount related to the claim liability for and potential recoveries thereof related to financial guarantee insurance contracts presented in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(vi) -URI http://asc.fasb.org/extlink&oid=82853773&loc=SL5749324-161292 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=96866959&loc=SL5751133-161288 + Details
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- Definition This element represents the amount of unearned premium revenue, reported on or included in the statement of financial position, related to financial guarantee insurance contracts and presented in the schedule of insured financial obligations with credit deterioration in the context of each surveillance grouping or category used by management to monitor and track potential deterioration in the credit worthiness of the insured party's ability to meet its financial obligations related to the contracts underlying financial guarantee insurance contracts the entity has issued. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 55 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=96866959&loc=SL5751133-161288 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 9 -Subparagraph (a)(5)(ix) -URI http://asc.fasb.org/extlink&oid=82853773&loc=SL5749324-161292 + Details
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