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Loss and Loss Adjustment Expense Reserves (Schedule Of Financial Guarantees And Related Claim Liability) (Detail)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
USD ($)
Issue
Policy
Dec. 31, 2024
USD ($)
Issue
Policy
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | Policy 120 119
Number of issues | Issue [1] 87 86
Remaining weighted average contract period (in years) 5 years 9 months 18 days 6 years 2 months 12 days
Principal [2] $ 2,297 $ 2,226
Interest [2] 1,808 1,876
Total [2] 4,105 4,102
Gross claim liability [3] 881 906
Less: Gross potential recoveries [4] 460 467
Discount, net [5] 101 107
Net claim liability (recoverable) 320 332
Unearned premium revenue 13 13
Reinsurance recoverable on paid and unpaid losses [6] $ 16 $ 16
Caution List Low [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | Policy 29 29
Number of issues | Issue [1] 10 10
Remaining weighted average contract period (in years) 5 years 7 months 6 days 5 years 8 months 12 days
Principal [2] $ 699 $ 717
Interest [2] 1,267 1,307
Total [2] 1,966 2,024
Gross claim liability [3] 0 0
Less: Gross potential recoveries [4] 0 0
Discount, net [5] 0 0
Net claim liability (recoverable) 0 0
Unearned premium revenue $ 4 $ 4
Caution List Medium [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | Policy 0 0
Number of issues | Issue [1] 0 0
Principal [2] $ 0 $ 0
Interest [2] 0 0
Total [2] 0 0
Gross claim liability [3] 0 0
Less: Gross potential recoveries [4] 0 0
Discount, net [5] 0 0
Net claim liability (recoverable) 0 0
Unearned premium revenue $ 0 $ 0
Caution List High [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | Policy 0 0
Number of issues | Issue [1] 0 0
Principal [2] $ 0 $ 0
Interest [2] 0 0
Total [2] 0 0
Gross claim liability [3] 0 0
Less: Gross potential recoveries [4] 0 0
Discount, net [5] 0 0
Net claim liability (recoverable) 0 0
Unearned premium revenue $ 0 $ 0
Classified List [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | Policy 91 90
Number of issues | Issue [1] 77 76
Remaining weighted average contract period (in years) 5 years 10 months 24 days 6 years 4 months 24 days
Principal [2] $ 1,598 $ 1,509
Interest [2] 541 569
Total [2] 2,139 2,078
Gross claim liability [3] 881 906
Less: Gross potential recoveries [4] 460 467
Discount, net [5] 101 107
Net claim liability (recoverable) 320 332
Unearned premium revenue $ 9 $ 9
[1] An “issue” represents the aggregate of financial guarantee policies that share the same revenue source for purposes of making debt service payments on the insured debt.
[2] Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA.
[3] The gross claim liability with respect to Puerto Rico exposures are net of expected recoveries for policies in a net payable position.
[4] Gross potential recoveries with respect to certain Puerto Rico exposures are net of the claim liability for policies in a net recoverable position.
[5] Represents discount related to Gross Claim Liability and Gross Potential Recoveries.
[6] Included in "Other assets" on the Company's consolidated balance sheets.