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Loss And Loss Adjustment Expense Reserves (Schedule Of Financial Guarantees And Related Claim Liability) (Detail)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
issue
policy
Dec. 31, 2015
USD ($)
issue
policy
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | policy 412 411
Number of issues | issue [1] 145 140
Remaining weighted average contract period (in years) 7 years 3 months 18 days 7 years 4 months 24 days
Principal [2] $ 10,642 $ 11,160
Interest [2] 5,989 6,247
Total [2] 16,631 17,407
Gross claim liability 738 797
Less: Gross potential recoveries 499 752
Discount, net [3] 75 116
Net claim liability (recoverable) 164 (71)
Unearned premium revenue $ 92 $ 98
Caution List Low [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | policy 56 57
Number of issues | issue [1] 13 12
Remaining weighted average contract period (in years) 8 years 1 month 6 days 7 years 7 months 6 days
Principal [2] $ 2,440 $ 2,591
Interest [2] 2,679 2,733
Total [2] 5,119 5,324
Gross claim liability   0
Less: Gross potential recoveries   0
Discount, net [3]   0
Net claim liability (recoverable)   0
Unearned premium revenue $ 7 $ 8
Caution List Medium [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | policy 7 18
Number of issues | issue [1] 4 6
Remaining weighted average contract period (in years) 5 years 6 months 6 years 8 months 12 days
Principal [2] $ 55 $ 147
Interest [2] 16 57
Total [2] 71 204
Gross claim liability   0
Less: Gross potential recoveries   0
Discount, net [3]   0
Net claim liability (recoverable)   0
Unearned premium revenue $ 1 $ 2
Caution List High [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | policy 5 171
Number of issues | issue [1] 3 5
Remaining weighted average contract period (in years) 7 years 4 months 24 days 9 years 7 months 6 days
Principal [2] $ 352 $ 1,996
Interest [2] 121 1,038
Total [2] 473 3,034
Gross claim liability   0
Less: Gross potential recoveries   0
Discount, net [3]   0
Net claim liability (recoverable)   0
Unearned premium revenue $ 9 $ 33
Classified List [Member]    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies | policy 344 165
Number of issues | issue [1] 125 117
Remaining weighted average contract period (in years) 7 years 1 month 6 days 6 years 8 months 12 days
Principal [2] $ 7,795 $ 6,426
Interest [2] 3,173 2,419
Total [2] 10,968 8,845
Gross claim liability 738 797
Less: Gross potential recoveries 499 752
Discount, net [3] 75 116
Net claim liability (recoverable) 164 (71)
Unearned premium revenue $ 75 $ 55
[1] An issue represents the aggregate of financial guarantee policies that share the same revenue source for purposes of making debt service payments.
[2] Represents contractual principal and interest payments due by the issuer of the obligations insured by MBIA.
[3] Represents discount related to Gross Claim Liability and Gross Potential Recoveries.