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Loss and Loss Adjustment Expense Reserves (Tables)
 6 Months Ended
Jun. 30, 2013
Text Block [Abstract]  
Schedule Of Losses And Loss Adjustment Expenses
                
 Losses and LAE Six Months Ended June 30, 2013 
    Second-lien First-lien     
 In millions RMBS RMBS Other(1) Total 
 Losses and LAE related to actual and expected payments $99 $(2) $114 $211 
 Recoveries of actual and expected payments  (219)  (5)  9  (215) 
 Gross losses incurred  (120)  (7)  123  (4) 
 Reinsurance  0  0  (2)  (2) 
 Losses and LAE $(120) $(7) $121 $(6) 
 __________           
 (1) - Includes ABS CDOs, CMBS, U.S. public finance and other issues.
                
Schedule Of Financial Guarantees And Related Claim Liability
     Surveillance Categories
     Caution Caution Caution      
     List List List Classified   
$ in millions Low Medium High List Total
Number of policies  53  23  7  207  290
Number of issues(1)  28  16  6  139  189
Remaining weighted average contract                
 period (in years)  8.0  4.9  10.3  9.3  8.5
Gross insured contractual payments                
 outstanding:(2)               
  Principal $3,812 $1,263 $80 $8,653 $13,808
  Interest  2,580  322  44  4,807  7,753
   Total $6,392 $1,585 $124 $13,460 $21,561
Gross claim liability $0 $0 $0 $1,600 $1,600
Less:               
 Gross potential recoveries  0  0  0  1,496  1,496
 Discount, net  0  0  0  241  241
Net claim liability (recoverable) $0 $0 $0 $(137) $(137)
Unearned premium revenue $124 $20 $1 $105 $250
__________               
(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.

     Surveillance Categories
     Caution Caution Caution      
     List List List Classified   
$ in millions Low Medium High List Total
Number of policies  54  25  10  206  295
Number of issues(1)  29  15  10  136  190
Remaining weighted average contract                
 period (in years)  8.1  4.0  7.6  9.5  8.7
Gross insured contractual payments                
 outstanding:(2)               
  Principal $4,250 $1,176 $373 $9,458 $15,257
  Interest  2,721  256  120  5,264  8,361
   Total $6,971 $1,432 $493 $14,722 $23,618
Gross claim liability $0 $0 $0 $1,589 $1,589
Less:               
 Gross potential recoveries  0  0  0  4,109  4,109
 Discount, net  0  0  0  229  229
Net claim liability (recoverable) $0 $0 $0 $(2,749) $(2,749)
Unearned premium revenue $142 $11 $3 $122 $278
__________               
(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.
Present Value Of The Probability-Weighted Future Claim Payments And Recoveries
    As of As of 
 In millions June 30, 2013 December 31, 2012 
 Loss reserves (claim liability) $711 $790 
 LAE reserves  63  63 
  Loss and LAE reserves $774 $853 
          
 Insurance claim loss recoverable $(902) $(3,610) 
 LAE insurance loss recoverable  (5)  (38) 
  Insurance loss recoverable $(907) $(3,648) 
          
 Reinsurance recoverable on unpaid losses $13 $14 
 Reinsurance recoverable on LAE reserves  1  0 
 Reinsurance recoverable on paid losses  0  1 
  Reinsurance recoverable on paid and unpaid losses $14 $15 
Schedule Of Company's Second-Lien RMBS Exposure, Gross Undiscounted Claim Liability And Potential Recoveries, Excluding Amounts Related To Consolidated VIE's
Second-lien RMBS Exposure   Outstanding Gross Undiscounted
     Gross Gross Claim Potential
$ in billions Issues Principal Interest Liability Recoveries
Excluding Consolidated VIEs:              
 Non-consolidated VIEs 23 $3.7 $1.3 $0.2 $0.9
Consolidated VIEs:              
 Consolidated VIEs 11 $1.9 $0.7 $0.1 $1.4
Schedule Of Loss And Loss Adjustment Expenses Reserves
In millions Changes in Loss and LAE Reserves for the Six Months Ended June 30, 2013   
Gross Loss Loss                      Gross Loss
and LAE Payments Accretion       Changes in    Changes in    and LAE
Reserves as of for Cases of Claim Changes in Changes in Amount of   Unearned Changes in Reserves as of
December 31, with Liability Discount Timing of Net Changes in Premium LAE June 30,
2012 Reserves Discount Rates Payments Payments Assumptions Revenue Reserves 2013
$853 $(152) $6 $(62) $47 $52 $13 $17 $0 $774
Schedule Of Insurance Loss Recoverable And Changes In Recoveries On Unpaid Losses
       Changes in Insurance Loss Recoverable and Recoveries on Unpaid Losses   
       for the Six Months Ended June 30, 2013   
   Gross            Gross
   Reserve Collections          Reserve
   as of for Cases Accretion Changes in Changes in Changes in    Changes in as of
   December 31, with of Discount Timing of Amount of Changes in LAE June 30,
In millions 2012 Recoveries Recoveries Rates Collections Collections Assumptions Recoveries 2013
Insurance loss                           
 recoverable $3,648 $(2,852) $13 $(22) $0 $(1) $154 $(33) $907
Recoveries on unpaid                            
 losses  332  0  2  (22)  0  0  83  2  397
Total $3,980 $(2,852) $15 $(44) $0 $(1) $237 $(31) $1,304
Schedule Of Total Estimated Recoveries From Ineligible Second-Lien Mortgage Loans
In millions                  
Total Estimated                Total Estimated
Recoveries from                Recoveries from
Ineligible Mortgage Accretion Changes in    Changes in    Ineligible Mortgage
Loans as of of Future Discount Recoveries Amount of  Changes in Loans as of
December 31, 2012 Collections Rates (Collections) Collections Assumptions June 30, 2013
$ 3,583 $ 15 $ (3) $ (2,897) $ 1 $ 434 $ 1,133
Schedule Of Expenses Related To Remedial Actions For Insured Obligations
   Six Months Ended June 30, 
 In millions 2013 2012 
 Loss adjustment expense incurred, gross $33 $81