v3.26.1
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, 2026
USD ($)
Issue
Policy
Dec. 31, 2025
USD ($)
Issue
Policy
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | Policy 107 107
Number of issues | Issue [1] 83 83
Remaining weighted average contract period (in years) 5 years 4 months 24 days 5 years 7 months 6 days
Principal [2] $ 1,656 $ 1,685
Interest [2] 1,481 1,532
Total [2] 3,137 3,217
Gross claim liability [3] 762 786
Less: Gross potential recoveries [4] 279 281
Discount, net [5] 100 101
Net claim liability (recoverable) 383 404
Unearned premium revenue 7 9
Reinsurance recoverable on paid and unpaid losses [6] $ 15 $ 14
Caution List Low [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | Policy 20 20
Number of issues | Issue [1] 7 7
Remaining weighted average contract period (in years) 3 years 3 months 18 days 3 years 6 months
Principal [2] $ 348 $ 356
Interest [2] 1,028 1,054
Total [2] 1,376 1,410
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 $ 1
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 87 87
Number of issues | Issue [1] 76 76
Remaining weighted average contract period (in years) 6 years 6 years 1 month 6 days
Principal [2] $ 1,308 $ 1,329
Interest [2] 453 478
Total [2] 1,761 1,807
Gross claim liability [3] 762 786
Less: Gross potential recoveries [4] 279 281
Discount, net [5] 100 101
Net claim liability (recoverable) 383 404
Unearned premium revenue $ 7 $ 8
[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 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.