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Loss And Loss Adjustment Expense Reserves (Schedule Of Financial Guarantees And Related Claim Liability) (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
policy
issue
Dec. 31, 2013
issue
policy
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies 339 299
Number of issues 156 [1] 180 [1]
Remaining weighted average contract period (in years) 9 years 0 months 0 days 9 years 8 months 12 days
Principal $ 12,424 [2] $ 14,264 [2]
Interest 7,270 [2] 8,632 [2]
Total 19,694 [2] 22,896 [2]
Gross claim liability 841 1,235
Less: Gross potential recoveries 798 1,085
Discount, net 120 [3] 205 [3]
Net claim liability (recoverable) (77) (55)
Unearned premium revenue 213 227
Caution List Low [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies 46 83
Number of issues 21 [1] 26 [1]
Remaining weighted average contract period (in years) 8 years 8 months 12 days 11 years 0 months 0 days
Principal 2,648 [2] 5,290 [2]
Interest 2,137 [2] 3,829 [2]
Total 4,785 [2] 9,119 [2]
Gross claim liability 0 0
Less: Gross potential recoveries 0 0
Discount, net 0 [3] 0 [3]
Net claim liability (recoverable) 0 0
Unearned premium revenue 86 112
Caution List Medium [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies 102 19
Number of issues 10 [1] 14 [1]
Remaining weighted average contract period (in years) 11 years 4 months 24 days 4 years 10 months 24 days
Principal 1,735 [2] 1,073 [2]
Interest 957 [2] 253 [2]
Total 2,692 [2] 1,326 [2]
Gross claim liability 0 0
Less: Gross potential recoveries 0 0
Discount, net 0 [3] 0 [3]
Net claim liability (recoverable) 0 0
Unearned premium revenue 34 19
Caution List High [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies 6 5
Number of issues 5 [1] 4 [1]
Remaining weighted average contract period (in years) 10 years 0 months 0 days 11 years 6 months 0 days
Principal 162 [2] 40 [2]
Interest 87 [2] 24 [2]
Total 249 [2] 64 [2]
Gross claim liability 0 0
Less: Gross potential recoveries 0 0
Discount, net 0 [3] 0 [3]
Net claim liability (recoverable) 0 0
Unearned premium revenue 5 0
Classified List [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies 185 192
Number of issues 120 [1] 136 [1]
Remaining weighted average contract period (in years) 8 years 6 months 0 days 9 years 6 months 0 days
Principal 7,879 [2] 7,861 [2]
Interest 4,089 [2] 4,526 [2]
Total 11,968 [2] 12,387 [2]
Gross claim liability 841 1,235
Less: Gross potential recoveries 798 1,085
Discount, net 120 [3] 205 [3]
Net claim liability (recoverable) (77) (55)
Unearned premium revenue $ 88 $ 96
[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.