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Insurance Regulations And Dividends (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2011 | Dec. 31, 2010
Insurance Regulations And Dividends [Line Items] |  |  |
Percentage of policyholders' surplus |  | 10.00% |
Adjusted net investment income |  | 100.00% |
Declared and paid a dividend |  | $ 0 |
Net loss |  | 477,000,000 | 434,000,000
Qualifying asset shortfall | 582,000,000 | 582,000,000 |
Contingency reserve release to surplus | 582,000,000 | 900,000,000 |
National [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Dividend capacity |  | 142,000,000 | 91,000,000
Policyholders' surplus | 1,400,000,000 | 1,400,000,000 |
Contingency reserves | 1,400,000,000 | 1,400,000,000 |
Statutory net income |  | 478,000,000 | 409,000,000
Statutory capital |  | 2,800,000,000 | 2,400,000,000
MBIA Corp. [Member] |  |  |
Insurance Regulations And Dividends [Line Items] |  |  |
Policyholders' surplus | 1,600,000,000 | 1,600,000,000 |
Contingency reserves | 706,000,000 | 706,000,000 |
Statutory capital |  | $ 2,300,000,000 | $ 2,700,000,000

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- Definition Equity impact of aggregate cash, stock, and paid-in-kind dividends declared for all securities (common shares, preferred shares, etc.) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 14 -Subparagraph l -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 + Details
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