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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, 2013
policy
issue
Dec. 31, 2012
issue
policy
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies 307 295
Number of issues 186 [1] 190 [1]
Remaining weighted average contract period (in years) 9 years 9 months 18 days 8 years 8 months 12 days
Principal $ 15,182 [2] $ 15,257 [2]
Interest 9,128 [2] 8,361 [2]
Total 24,310 [2] 23,618 [2]
Gross claim liability 1,504 1,589
Less: Gross potential recoveries 1,264 4,109
Discount, net 272 229
Net claim liability (recoverable) (32) (2,749)
Unearned premium revenue 251 278
Caution List Low [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies 89 54
Number of issues 31 [1] 29 [1]
Remaining weighted average contract period (in years) 10 years 9 months 18 days 8 years 1 month 6 days
Principal 5,686 [2] 4,250 [2]
Interest 3,998 [2] 2,721 [2]
Total 9,684 [2] 6,971 [2]
Gross claim liability 0 0
Less: Gross potential recoveries 0 0
Discount, net 0 0
Net claim liability (recoverable) 0 0
Unearned premium revenue 129 142
Caution List Medium [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies 20 25
Number of issues 15 [1] 15 [1]
Remaining weighted average contract period (in years) 5 years 3 months 18 days 4 years 0 months 0 days
Principal 1,099 [2] 1,176 [2]
Interest 279 [2] 256 [2]
Total 1,378 [2] 1,432 [2]
Gross claim liability 0 0
Less: Gross potential recoveries 0 0
Discount, net 0 0
Net claim liability (recoverable) 0 0
Unearned premium revenue 20 11
Caution List High [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies 6 10
Number of issues 5 [1] 10 [1]
Remaining weighted average contract period (in years) 9 years 7 months 6 days 7 years 7 months 6 days
Principal 65 [2] 373 [2]
Interest 32 [2] 120 [2]
Total 97 [2] 493 [2]
Gross claim liability 0 0
Less: Gross potential recoveries 0 0
Discount, net 0 0
Net claim liability (recoverable) 0 0
Unearned premium revenue 1 3
Classified List [Member]
    
Loss And Loss Adjustment Expense Reserves [Line Items]    
Number of policies 192 206
Number of issues 135 [1] 136 [1]
Remaining weighted average contract period (in years) 9 years 7 months 6 days 9 years 6 months 0 days
Principal 8,332 [2] 9,458 [2]
Interest 4,819 [2] 5,264 [2]
Total 13,151 [2] 14,722 [2]
Gross claim liability 1,504 1,589
Less: Gross potential recoveries 1,264 4,109
Discount, net 272 229
Net claim liability (recoverable) (32) (2,749)
Unearned premium revenue $ 101 $ 122
[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.