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Insurance Regulations And Dividends (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012
Insurance Regulations And Dividends [Line Items] |  |  |
Percentage of policyholders' surplus | 10.00% |  |
Percentage of adjusted net investment income | 100.00% |  |
Maximum percentage of notional asset swap | 5.00% |  |
MBIA Corp [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Dividends from subsidiaries | $ 0 |  |
Aggregate risk limits exceeded | 233,000,000 |  |
Requested contingency reserve release to surplus |  |  | 1,100,000,000
Statutory net loss | 494,000,000 | 843,000,000 |
Statutory capital | 825,000,000 | 1,500,000,000 |
Policyholders' surplus | 403,000,000 |  |
Contingency reserves | 422,000,000 |  |
MBIA Corp [Member] | Minimum Surplus And Contingency Reserves [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Investments in certain qualifing assets | 100.00% |  |
MBIA Corp [Member] | Loss Reserves And Unearned Premium Reserves [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Investments in certain qualifing assets | 50.00% |  |
MBIA Corp [Member] | Policyholders Surplus [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Statutory surplus negative impact | 129,000,000 |  |
Maximum percentage of statutory admitted assets invested in subsidiaries | 50.00% |  |
MBIA Corp [Member] | Surplus [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Maximum percentage of statutory admitted assets invested in subsidiaries | 60.00% |  |
National [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Dividends from subsidiaries | 214,000,000 |  |
Unassigned surplus | 0 |  |
Statutory capital | 3,300,000,000 | 3,200,000,000 |
Policyholders' surplus | 2,100,000,000 |  |
Contingency reserves | 1,200,000,000 |  |
Statutory net income | $ 256,000,000 | $ 416,000,000 |

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- Definition This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.9-06) -URI http://asc.fasb.org/extlink&oid=6882215&loc=d3e537971-122884 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 06 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph b -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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