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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, 2021
USD ($)
issue
policy
Dec. 31, 2020
USD ($)
issue
policy
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | policy 279 281
Number of issues | issue [1] 117 119
Remaining weighted average contract period (in years) 7 years 3 months 18 days 7 years 4 months 24 days
Principal [2] $ 4,764 $ 4,847
Interest [2] 3,356 3,469
Total [2] 8,120 8,316
Gross claim liability [3] 1,010 1,088
Less: Gross potential recoveries [4] 2,115 1,947
Discount, net [5] (464) (173)
Net claim liability (recoverable) (641) (686)
Unearned premium revenue 43 45
Reinsurance recoverables on paid and unpaid losses [6] $ 11 $ 11
Caution List Low [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | policy 46 46
Number of issues | issue [1] 16 16
Remaining weighted average contract period (in years) 6 years 3 months 18 days 6 years 4 months 24 days
Principal [2] $ 1,390 $ 1,422
Interest [2] 1,933 1,974
Total [2] 3,323 3,396
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 $ 9 $ 10
Caution List Medium [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | policy 16 16
Number of issues | issue [1] 3 3
Remaining weighted average contract period (in years) 6 years 1 month 6 days 6 years 4 months 24 days
Principal [2] $ 123 $ 123
Interest [2] 53 54
Total [2] 176 177
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 217 219
Number of issues | issue [1] 98 100
Remaining weighted average contract period (in years) 7 years 9 months 18 days 7 years 10 months 24 days
Principal [2] $ 3,251 $ 3,302
Interest [2] 1,370 1,441
Total [2] 4,621 4,743
Gross claim liability [3] 1,010 1,088
Less: Gross potential recoveries [4] 2,115 1,947
Discount, net [5] (464) (173)
Net claim liability (recoverable) (641) (686)
Unearned premium revenue $ 34 $ 35
[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.