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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, 2024
Dec. 31, 2023
Insurance in Force $ 54.3 $ 60.9
Gross Par Amount 27.6 31.2
U S [Member]    
Insurance in Force 52.3 58.4
Non-United States [Member]    
Insurance in Force 2.0 2.5
Transportation [Member] | Non-United States [Member]    
Insurance in Force 0.3 0.4
Gross Par Amount 0.2 0.4
Other Public Finance [Member] | Non-United States [Member]    
Insurance in Force [1] 0.1 0.1
Gross Par Amount [1] 0.1 0.1
Sovereign Related And Sub-Sovereign [Member] | Non-United States [Member]    
Insurance in Force [2] 1.1 1.3
Gross Par Amount [2] 0.9 1.0
Global Public Finance [Member]    
Insurance in Force 52.7 58.9
Gross Par Amount 26.5 29.8
Global Public Finance [Member] | U S [Member]    
Insurance in Force 51.2 57.1
Gross Par Amount 25.3 28.3
Global Public Finance [Member] | Non-United States [Member]    
Insurance in Force 1.5 1.8
Gross Par Amount 1.2 1.5
Global Public Finance [Member] | General Obligation [Member] | U S [Member]    
Insurance in Force [3] 14.6 16.8
Gross Par Amount [3] 7.0 8.0
Global Public Finance [Member] | General Obligation—Lease [Member] | U S [Member]    
Insurance in Force 0.8 1.0
Gross Par Amount 0.5 0.7
Global Public Finance [Member] | Municipal Utilities [Member] | U S [Member]    
Insurance in Force 5.4 6.4
Gross Par Amount 3.9 4.6
Global Public Finance [Member] | Tax-Backed [Member] | U S [Member]    
Insurance in Force 9.8 11.0
Gross Par Amount 4.2 4.9
Global Public Finance [Member] | Transportation [Member] | U S [Member]    
Insurance in Force 6.1 6.5
Gross Par Amount 1.9 2.1
Global Public Finance [Member] | Higher Education [Member] | U S [Member]    
Insurance in Force 0.8 1.0
Gross Par Amount 0.6 0.7
Global Public Finance [Member] | Health Care [Member] | U S [Member]    
Insurance in Force 0.6 0.7
Gross Par Amount 0.4 0.4
Global Public Finance [Member] | Military Housing [Member] | U S [Member]    
Insurance in Force 12.7 13.2
Gross Par Amount 6.5 6.6
Global Public Finance [Member] | Investor-Owned Utilities [Member] | U S [Member]    
Insurance in Force [4] 0.4 0.4
Gross Par Amount [4] 0.3 0.3
Global Public Finance [Member] | Other Public Finance [Member] | U S [Member]    
Insurance in Force [5] 0.0 0.1
Gross Par Amount [5] 0.0 0.0
Global Structured Finance [Member]    
Insurance in Force 1.6 2.0
Gross Par Amount 1.1 1.4
Global Structured Finance [Member] | Collateralized Debt Obligations [Member]    
Insurance in Force 0.0 0.1
Gross Par Amount 0.0 0.1
Global Structured Finance [Member] | Residential Mortgage Backed Securities [Member]    
Insurance in Force 0.8 0.9
Gross Par Amount 0.5 0.6
Global Structured Finance [Member] | Commercial Mortgage-Backed [Member]    
Insurance in Force 0.3 0.4
Gross Par Amount 0.1 0.2
Global Structured Finance [Member] | Consumer Asset Backed [Member]    
Insurance in Force 0.1 0.1
Gross Par Amount 0.1 0.1
Global Structured Finance [Member] | Corporate Asset Backed [Member]    
Insurance in Force 0.4 0.5
Gross Par Amount $ 0.4 $ 0.4
[1] Includes municipal owned entities backed by sponsoring local government, tax backed and utility transactions.
[2] 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.
[3] 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
[4] Includes investor owned utilities, industrial development and pollution control revenue bonds.
[5] Includes stadium related financings, municipal housing and certain non-profit enterprises.