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Loss and Loss Adjustment Expense Reserves (Schedule Of Financial Guarantees And Related Claim Liability) (Detail)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Issue
Policy
Dec. 31, 2024
USD ($)
Issue
Policy
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | Policy 110 119
Number of issues | Issue [1] 83 86
Remaining weighted average contract period (in years) 5 years 6 months 6 years 2 months 12 days
Principal [2] $ 1,787 $ 2,226
Interest [2] 1,627 1,876
Total [2] 3,414 4,102
Gross claim liability [3] 782 906
Less: Gross potential recoveries [4] 277 467
Discount, net [5] 107 107
Net claim liability (recoverable) 398 332
Unearned premium revenue 9 13
Reinsurance recoverable on paid and unpaid losses [6] $ 14 $ 16
Caution List Low [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | Policy 23 29
Number of issues | Issue [1] 7 10
Remaining weighted average contract period (in years) 3 years 2 months 12 days 5 years 8 months 12 days
Principal [2] $ 425 $ 717
Interest [2] 1,128 1,307
Total [2] 1,553 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 $ 1 $ 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 87 90
Number of issues | Issue 76 76 [1]
Remaining weighted average contract period (in years) 6 years 3 months 18 days 6 years 4 months 24 days
Principal $ 1,362 $ 1,509 [2]
Interest 499 569 [2]
Total 1,861 2,078 [2]
Gross claim liability 782 906 [3]
Less: Gross potential recoveries 277 467 [4]
Discount, net 107 107 [5]
Net claim liability (recoverable) 398 332
Unearned premium revenue $ 8 $ 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.