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Insurance In Force (Schedule Of Insurance In Force By Type Of Bond, Excluding Transactions Guaranteed By MBIA Corp. On Behalf Of Various Investment Management Services Affiliated Companies) (Details) (USD $) In Billions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | $ 840.1 |  | $ 1,025.0 |
% of Insurance in Force | 100.00% |  | 100.00% |
United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 752.5 |  | 919.1 |
% of Insurance in Force | 89.60% |  | 89.70% |
Non-United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 87.6 |  | 105.9 |
% of Insurance in Force | 10.40% |  | 10.30% |
Global Public Finance [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 707.2 |  | 833.0 |
% of Insurance in Force | 84.20% |  | 81.30% |
Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 656.6 |  | 777.4 |
% of Insurance in Force | 78.20% |  | 75.80% |
Global Public Finance [Member] | Non-United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 50.6 |  | 55.6 |
% of Insurance in Force | 6.00% |  | 5.50% |
Global Structured Finance [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 132.9 |  | 192.0 |
% of Insurance in Force | 15.80% |  | 18.70% |
General Obligation [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 234.3 |  | 278.7 |
% of Insurance in Force | 27.90% |  | 27.20% |
General Obligation - Lease [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 51.7 |  | 60.2 |
% of Insurance in Force | 6.20% |  | 5.90% |
Municipal Utilities [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 117.0 |  | 138.8 |
% of Insurance in Force | 13.90% |  | 13.50% |
Tax-Backed [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 86.3 |  | 98.9 |
% of Insurance in Force | 10.30% |  | 9.60% |
Tax-Backed [Member] | Global Public Finance [Member] | Non-United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 0.2 |  | 0.2 |
% of Insurance in Force | 0.00% |  | 0.00% |
Transportation [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 68.3 |  | 84.5 |
% of Insurance in Force | 8.10% |  | 8.20% |
Transportation [Member] | Global Public Finance [Member] | Non-United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 15.0 |  | 15.9 |
% of Insurance in Force | 1.80% |  | 1.60% |
Higher Education [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 36.9 |  | 42.5 |
% of Insurance in Force | 4.40% |  | 4.10% |
Health Care [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 16.9 |  | 21.4 |
% of Insurance in Force | 2.00% |  | 2.10% |
Health Care [Member] | Global Public Finance [Member] | Non-United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 0.1 |  | 0 |
% of Insurance in Force | 0.00% |  | 0.00% |
Military Housing [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 19.4 |  | 20.5 |
% of Insurance in Force | 2.30% |  | 2.00% |
Investor-Owned Utilities [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 11.5 | [1] | 13.5 | [1]
% of Insurance in Force | 1.40% | [1] | 1.30% | [1]
Municipal Housing [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 9.4 |  | 11.0 |
% of Insurance in Force | 1.10% |  | 1.10% |
Student Loans [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 2.1 |  | 3.6 |
% of Insurance in Force | 0.30% |  | 0.40% |
Other Public Finance [Member] | Global Public Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 2.8 | [2] | 3.8 | [2]
% of Insurance in Force | 0.30% | [2] | 0.40% | [2]
International Utilities [Member] | Global Public Finance [Member] | Non-United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 16.2 |  | 18.6 |
% of Insurance in Force | 1.90% |  | 1.80% |
Sovereign Related And Sub-Sovereign [Member] | Global Public Finance [Member] | Non-United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 18.6 | [3] | 20.3 | [3]
% of Insurance in Force | 2.20% | [3] | 2.00% | [3]
Local Governments [Member] | Global Public Finance [Member] | Non-United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 0.5 | [4] | 0.6 | [4]
% of Insurance in Force | 0.10% | [4] | 0.10% | [4]
Collateralized Debt Obligations [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 78.7 |  | 123.5 |
% of Insurance in Force | 9.40% |  | 12.10% |
Residential Mortgage-Backed Securities [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 21.1 |  | 24.1 |
% of Insurance in Force | 2.50% |  | 2.40% |
Commercial Mortgage Backed [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 4.4 |  | 5.4 |
% of Insurance in Force | 0.50% |  | 0.50% |
Consumer Asset-Backed, Auto Loans [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 0.7 |  | 2.2 |
% of Insurance in Force | 0.10% |  | 0.20% |
Consumer Asset-Backed, Student Loans [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 1.7 |  | 1.9 |
% of Insurance in Force | 0.20% |  | 0.20% |
Consumer Asset-Backed, Manufactured Housing [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 2.2 |  | 2.5 |
% of Insurance in Force | 0.30% |  | 0.20% |
Other Consumer Asset-Backed [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 0.2 |  | 0.4 |
% of Insurance in Force | 0.00% |  | 0.00% |
Corporate Asset-Backed, Aircraft Portfolio Lease Securitizations [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 3.2 |  | 4.5 |
% of Insurance in Force | 0.40% |  | 0.40% |
Corporate Asset-Backed, Rental Car Fleets [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force |  |  | 0.3 |
% of Insurance in Force | 0.00% |  | 0.00% |
Corporate Asset-Backed, Secured Airline Equipment Securitization (EETC) [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 3.2 |  | 3.5 |
% of Insurance in Force | 0.30% |  | 0.30% |
Corporate Asset-Backed, Other Operating Assets [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 0.7 |  | 0.9 |
% of Insurance in Force | 0.10% |  | 0.10% |
Corporate Asset-Backed, Structured Insurance Securitizations [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 7.5 |  | 9.2 |
% of Insurance in Force | 0.90% |  | 0.90% |
Corporate Asset-Backed, Franchise Assets [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 1.3 |  | 1.6 |
% of Insurance in Force | 0.20% |  | 0.20% |
Corporate Asset-Backed, Intellectual Property [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 1.9 |  | 3.7 |
% of Insurance in Force | 0.20% |  | 0.40% |
Corporate Asset-Backed, Future Flow [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | 0.4 |  | 1.2 |
% of Insurance in Force | 0.00% |  | 0.10% |
Other Corporate Asset-Backed [Member] | Global Structured Finance [Member] | United States [Member] |  |  |  |
Insurance In Force [Line Items] |  |  |  |
Insurance in Force | $ 5.7 |  | $ 7.1 |
% of Insurance in Force | 0.70% |  | 0.70% |
[1] | Includes investor owned utilities, industrial development and pollution control revenue bonds.
[2] | Includes certain non-profit enterprises and stadium related financing.
[3] | Includes regions, departments or their equivalent in each jurisdiction as well as sovereign owned entities that are supported by a sovereign state, region or department.
[4] | Includes municipal owned entities backed by sponsoring local government.

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- Definition The amount as of the balance sheet date of the participating business in force. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 50 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6483535&loc=d3e16392-158451 + Details
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- Definition This percent places participating policies in the numerator and insurance contracts in force in the denominator. Participating insurance contracts allow policyholders to share in the experience of the entity, primarily through policy dividends. + 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 210.7-03.14(b)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 60 -Paragraph 60 -Subparagraph g -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 SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 14 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 50 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6483535&loc=d3e16392-158451 + Details
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