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Consolidated Statement Of Changes In Shareholders' Equity (Parenthetical) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
ASC 944-20 transition adjustment, tax |  |  | $ 27
ASC 320-10 transition adjustment, tax |  |  | 30
Consolidated variable interest entities, tax |  | 23 |
Deconsolidated variable interest entities, tax |  | 2 |
Change in unrealized gains and losses on investments, tax | 119 | 112 | 526
Change in fair value of derivative instruments, tax | 3 | (7) | 46
Change in foreign currency translation, tax | (1) | 2 | 4
Total Shareholders' Equity Of MBIA Inc. [Member] |  |  |
Change in unrealized gains and losses on investments, tax | 119 | 112 | 526
Portion of other-than-temporary impairment losses recognized in other comprehensive loss, tax | 3 | 4 | 50
Change in fair value of derivative instruments, tax | 3 | 7 | 46
Change in foreign currency translation, tax | 1 | 2 | 4
Share-based compensation, tax | $ 4 | $ 3 | $ 5

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- Definition Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 62 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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