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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 And Other Affiliated Companies) (Detail) - USD ($) $ in Billions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Insurance in Force |  | $ 154.9 | $ 235.9
Gross Par Amount |  | 87.0 | 141.2
U S [Member] |  |  |
Insurance in Force |  | 143.4 | 205.5
Non-United States [Member] |  |  |
Insurance in Force |  | 11.5 | 30.4
Global Public Finance [Member] |  |  |
Insurance in Force |  | 144.2 | 220.3
Gross Par Amount |  | 79.7 | 129.8
Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force |  | 134.0 | 191.5
Gross Par Amount |  | 71.9 | 110.4
Global Public Finance [Member] | Non-United States [Member] |  |  |
Insurance in Force |  | 10.2 | 28.8
Gross Par Amount |  | 7.8 | 19.4
Global Structured Finance [Member] |  |  |
Insurance in Force |  | 10.7 | 15.6
Gross Par Amount |  | 7.3 | 11.4
General Obligation [Member] | Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force | [1] | 42.8 | 64.6
Gross Par Amount | [1] | 22.9 | 38.3
General Obligation - Lease [Member] | Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force |  | 5.1 | 12.2
Gross Par Amount |  | 3.8 | 8.7
Municipal Utilities [Member] | Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force |  | 17.7 | 26.1
Gross Par Amount |  | 11.8 | 17.4
Tax-Backed [Member] | Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force |  | 26.5 | 33.0
Gross Par Amount |  | 12.4 | 16.7
Transportation [Member] | Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force |  | 15.2 | 21.7
Gross Par Amount |  | 6.9 | 11.1
Transportation [Member] | Global Public Finance [Member] | Non-United States [Member] |  |  |
Insurance in Force |  | 4.5 | 7.1
Gross Par Amount |  | 3.6 | 5.2
Higher Education [Member] | Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force |  | 3.2 | 6.8
Gross Par Amount |  | 2.1 | 4.5
Health Care [Member] | Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force |  | 2.6 | 4.2
Gross Par Amount |  | 1.8 | 2.7
Military Housing [Member] | Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force |  | 16.3 | 16.8
Gross Par Amount |  | 7.3 | 7.4
Investor-Owned Utilities [Member] | Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force | [2] | 3.1 | 3.7
Gross Par Amount | [2] | 2.0 | 2.3
Municipal Housing [Member] | Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force |  | 0.4 | 0.7
Gross Par Amount |  | 0.3 | 0.4
Other Public Finance [Member] | Global Public Finance [Member] | U S [Member] |  |  |
Insurance in Force | [3] | 1.1 | 1.7
Gross Par Amount | [3] | 0.6 | 0.9
Other Public Finance [Member] | Global Public Finance [Member] | Non-United States [Member] |  |  |
Insurance in Force | [4] | 0.2 | 0.3
Gross Par Amount | [4] | 0.1 | 0.2
International Utilities [Member] | Global Public Finance [Member] | Non-United States [Member] |  |  |
Insurance in Force |  | 1.7 | 10.1
Gross Par Amount |  | 1.4 | 6.5
Sovereign Related And Sub-Sovereign [Member] | Global Public Finance [Member] | Non-United States [Member] |  |  |
Insurance in Force | [5] | 3.8 | 11.3
Gross Par Amount | [5] | 2.7 | 7.5
Collateralized Debt Obligations [Member] | Global Structured Finance [Member] |  |  |
Insurance in Force | [6] | 0.5 | 2.7
Gross Par Amount | [6] | 0.4 | 2.6
Residential Mortgage Backed Securities [Member] | Global Structured Finance [Member] |  |  |
Insurance in Force |  | 4.7 | 6.3
Gross Par Amount |  | 3.6 | 4.7
Commercial Mortgage Backed Securities [Member] | Global Structured Finance [Member] |  |  |
Insurance in Force |  | 0.7 | 0.7
Gross Par Amount |  | 0.3 | 0.3
Consumer Asset Backed [Member] | Global Structured Finance [Member] |  |  |
Insurance in Force |  | 0.9 | 1.2
Gross Par Amount |  | 0.7 | 0.9
Corporate Asset Backed [Member] | Global Structured Finance [Member] |  |  |
Insurance in Force | [7] | 3.9 | 4.7
Gross Par Amount | [7] | 2.3 | 2.9
Structured Insurance Securitizations [Member] | Global Structured Finance [Member] |  |  |
Insurance in Force |  | 2.3 | 2.6
Gross Par Amount |  | $ 1.1 | $ 1.3
[1] | Includes general obligation unlimited and limited (property) tax bonds, general fund obligation bonds and pension obligation bonds of states, cities, counties, schools and special districts.
[2] | Includes investor owned utilities, industrial development and pollution control revenue bonds.
[3] | Includes certain non-profit enterprises, stadium related financing and student loans.
[4] | Includes municipal owned entities backed by sponsoring local government and tax backed transactions.
[5] | 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.
[6] | Includes a transaction (represented by structured pools of CRE assets) that does not include typical CDO structuring characteristics, such as tranched credit risk, cash flow waterfalls, or interest and over-collateralization coverage tests.
[7] | As of December 31, 2017, includes structured insurance securitizations of $2.3 billion and $1.1 billion of insurance in force and gross par amount, respectively. As of December 31, 2016, includes structured insurance securitizations of $2.6 billion and $1.3 billion of insurance in force and gross par amount, respectively.

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