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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2013
Text Block [Abstract]  
Quantitative Information Regarding The Significant Unobservable Inputs For Certain Assets And Liabilities Measured At Fair Value On A Recurring Basis
   Fair Value       
   as of     Range 
   June 30,     (Weighted 
In millions 2013 Valuation Techniques Unobservable Input Average) 
Assets of consolidated VIEs:          
 Loans receivable at fair value $1,790 Quoted market prices adjusted for financial Impact of financial guarantee 0% - 18% (4%) 
       guarantees provided to VIE obligations     
 Loan repurchase commitments  1,115 Discounted cash flow Recovery rates 10% - 66% (34%) 
        Breach rates 67% - 92% (77%) 
            
Liabilities of consolidated VIEs:          
 Variable interest entity notes  824 Quoted market prices of VIE assets Impact of financial guarantee 0% - 29% (10%) 
       adjusted for financial guarantees provided     
            
Credit derivative liabilities, net:          
 CMBS  1,024 BET Model Recovery rates 25% - 90% (60%) 
        Nonperformance risk 9% - 53% (23%) 
        Weighted average life (in years) 1.6 - 28.5 (3.8) 
        CMBS spreads 1.2% - 25.3% (12%) 
 Multi-sector CDO  15 Direct Price Model Nonperformance risk 53% - 53% (53%) 
 Other  609 BET Model Recovery rates 42% - 70% (47%) 
        Nonperformance risk 13% - 23% (21%) 
        Weighted average life (in years) 0.2 - 3.8 (2.3) 

   Fair Value       
   as of     Range 
   December 31,     (Weighted 
In millions 2012 Valuation Techniques Unobservable Input Average) 
Assets of consolidated VIEs:          
 Loans receivable at fair value $1,881 Quoted market prices adjusted for financial Impact of financial guarantee 0% - 14% (3%) 
       guarantees provided to VIE obligations     
 Loan repurchase commitments  1,086 Discounted cash flow Recovery rates 10% - 75% (47%) 
        Breach rates 66% - 94% (78%) 
            
Liabilities of consolidated VIEs:          
 Variable interest entity notes  1,932 Quoted market prices of VIE assets Impact of financial guarantee 0% - 23% (6%) 
       adjusted for financial guarantees provided     
            
Credit derivative liabilities, net:          
 CMBS  1,590 BET Model Recovery rates 21% - 90% (51%) 
        Nonperformance risk 19% - 59% (58%) 
        Weighted average life (in years) 0.1 - 5.6 (4.4) 
        CMBS spreads 1% - 23% (13%) 
 Multi-sector CDO  525 Direct Price Model Nonperformance risk 59% - 59% (59%) 
 Other  806 BET Model Recovery rates 42% - 75% (47%) 
        Nonperformance risk 42% - 59% (58%) 
        Weighted average life (in years) 0.1 - 19.6 (3.0) 
Company's Assets And Liabilities Measured At Fair Value On Recurring Basis
      Fair Value Measurements at Reporting Date Using   
      Quoted Prices in Significant          
      Active Markets Other Significant  Counterparty   
      for Identical Observable Unobservable  and Cash Balance as of
      Assets Inputs Inputs  Collateral June 30,
In millions (Level 1) (Level 2) (Level 3)  Netting 2013
Assets:                
Fixed-maturity investments:                
 U.S. Treasury and government agency $1,021 $220 $0  $0 $1,241
 State and municipal bonds  0  1,394  63 (1)  0  1,457
 Foreign governments  94  90  3 (1)  0  187
 Corporate obligations  0  1,119  63 (1)  0  1,182
 Mortgage-backed securities:                
  Residential mortgage-backed agency  0  907  3 (1)  0  910
  Residential mortgage-backed non-agency  0  80  1 (1)  0  81
  Commercial mortgage-backed  0  26  13 (1)  0  39
 Asset-backed securities:                
  Collateralized debt obligations  0  68  85 (1)  0  153
  Other asset-backed  0  85  64 (1)  0  149
   Total fixed-maturity investments  1,115  3,989  295   0  5,399
Money market securities  1,067  1  0   0  1,068
Perpetual debt and equity securities  26  14  10 (1)  0  50
Cash and cash equivalents  928  0  0   0  928
Derivative assets:                
 Non-insured derivative assets:                
  Interest rate derivatives  0  62  0   (59)  3
   Total derivative assets  0  62  0   (59)  3
                     
      Fair Value Measurements at Reporting Date Using   
      Quoted Prices in Significant          
      Active Markets Other Significant  Counterparty   
      for Identical Observable Unobservable  and Cash Balance as of
      Assets Inputs Inputs  Collateral June 30,
In millions (Level 1) (Level 2) (Level 3)  Netting 2013
Assets of consolidated VIEs:                
 Corporate obligations  0  48  48 (1)  0  96
 Mortgage-backed securities:                
  Residential mortgage-backed non-agency  0  265  2 (1)  0  267
  Commercial mortgage-backed  0  109  4 (1)  0  113
 Asset-backed securities:                
  Collateralized debt obligations  0  20  35 (1)  0  55
  Other asset-backed  0  69  63 (1)  0  132
 Money market securities  321  0  0   0  321
 Cash  78  0  0   0  78
 Loans receivable  0  0  1,790   0  1,790
 Loan repurchase commitments  0  0  1,115   0  1,115
 Interest rate derivatives  0  1  0   0  1
Total assets $3,535 $4,578 $3,362  $(59) $11,416
Liabilities:                
Medium-term notes $0 $0 $188 (1) $0 $188
Derivative liabilities:                
 Insured derivatives:                
  Credit derivatives  0  7  1,648   0  1,655
 Non-insured derivatives:                
  Interest rate derivatives  0  209  0   (209)  0
  Currency derivatives  0  1  0   (1)  0
Other liabilities:                
 Warrants  0  85  0   0  85
Liabilities of consolidated VIEs:                
 Variable interest entity notes  0  1,766  824   0  2,590
 Derivative liabilities:                
  Interest rate derivatives  0  2  0   0  2
  Currency derivatives  0  0  16 (1)  0  16
Total liabilities $0 $2,070 $2,676  $(210) $4,536
____________                
(1) - Unobservable inputs are either not developed by the Company or do not significantly impact the overall fair values of the aggregate financial assets and liabilities.
                     

      Fair Value Measurements at Reporting Date Using   
      Quoted Prices in Significant          
      Active Markets Other Significant  Counterparty   
      for Identical Observable Unobservable  and Cash Balance as of
      Assets Inputs Inputs  Collateral December 31,
In millions (Level 1) (Level 2) (Level 3)  Netting 2012
Assets:                
Fixed-maturity investments:                
 U.S. Treasury and government agency $784 $100 $0  $0 $884
 State and municipal bonds  0  1,429  103 (1)  0  1,532
 Foreign governments  86  107  3 (1)  0  196
 Corporate obligations  0  1,140  76 (1)  0  1,216
 Mortgage-backed securities:                
  Residential mortgage-backed agency  0  988  0   0  988
  Residential mortgage-backed non-agency  0  94  4 (1)  0  98
  Commercial mortgage-backed  0  20  28 (1)  0  48
 Asset-backed securities:                
  Collateralized debt obligations  0  65  31 (1)  0  96
  Other asset-backed  0  119  26 (1)  0  145
   Total fixed-maturity investments  870  4,062  271   0  5,203
Money market securities  585  8  0   0  593
Perpetual debt and equity securities  23  20  14 (1)  0  57
Cash and cash equivalents  814  0  0   0  814
Derivative assets:                
 Non-insured derivative assets:                
  Interest rate derivatives  0  89  5 (1)  (90)  4
   Total derivative assets  0  89  5   (90)  4
                     
      Fair Value Measurements at Reporting Date Using   
      Quoted Prices in Significant          
      Active Markets Other Significant  Counterparty   
      for Identical Observable Unobservable  and Cash Balance as of
      Assets Inputs Inputs  Collateral December 31,
In millions (Level 1) (Level 2) (Level 3)  Netting 2012
Assets of consolidated VIEs:                
 State and municipal bonds  0  41  0   0  41
 Corporate obligations  0  215  78 (1)  0  293
 Mortgage-backed securities:                
  Residential mortgage-backed non-agency  0  869  6 (1)  0  875
  Commercial mortgage-backed  0  410  7 (1)  0  417
 Asset-backed securities:                
  Collateralized debt obligations  0  215  125 (1)  0  340
  Other asset-backed  0  120  64 (1)  0  184
 Money market securities  210  0  0   0  210
 Cash  176  0  0   0  176
 Loans receivable  0  0  1,881   0  1,881
 Loan repurchase commitments  0  0  1,086   0  1,086
Total assets $2,678 $6,049 $3,537  $(90) $12,174
Liabilities:                
Medium-term notes $0 $0 $165 (1) $0 $165
Derivative liabilities:                
 Insured derivatives:                
  Credit derivatives  0  13  2,921   0  2,934
 Non-insured derivatives:                
  Interest rate derivatives  0  287  4 (1)  (293)  (2)
  Currency derivatives  0  1  1 (1)  0  2
Other liabilities:                
 Warrants  0  6  0   0  6
Liabilities of consolidated VIEs:                
 Variable interest entity notes  0  1,727  1,932   0  3,659
 Derivative liabilities:                
  Interest rate derivatives  0  141  0   0  141
  Currency derivatives  0  0  21 (1)  0  21
Total liabilities $0 $2,175 $5,044  $(293) $6,926
____________                
(1) - Unobservable inputs are either not developed by the Company or do not significantly impact the overall fair values of the aggregate financial assets and liabilities.
                     
Fair Value Hierarchy Table Presents The Company's Assets And Liabilities Not Recorded At Fair Value On The Company's Consolidated Balance Sheet
   Fair Value Measurements at Reporting Date Using       
   Quoted Prices in Significant Significant  Fair Value Carry Value 
    Active Markets for Other Observable Unobservable Balance as of  Balance as of  
    Identical Assets Inputs Inputs June 30, June 30, 
In millions  (Level 1)  (Level 2)  (Level 3) 2013 2013 
Assets:                
 Other investments $0 $0 $9 $9 $9 
 Accrued investment income(1)  42  0  0  42  42 
 Receivable for investments sold(1)  12  0  0  12  12 
 Net cash collateral pledged(1)  55  0  0  55  55 
Assets of consolidated VIEs:                
 Investments held-to-maturity  0  0  2,690  2,690  2,818 
Total assets $109 $0 $2,699 $2,808 $2,936 
Liabilities:                
 Investment agreements $0 $0 $931 $931 $775 
 Medium-term notes  0  0  1,018  1,018  1,373 
 Long-term debt  0  1,371  0  1,371  1,524 
 Payable for investments purchased(2)  43  0  0  43  43 
 Accrued interest expense(2)  9  100  0  109  125 
Liabilities of consolidated VIEs:                
 Variable interest entity notes  0  0  2,965  2,965  3,117 
Total liabilities $52 $1,471 $4,914 $6,437 $6,957 
Financial Guarantees:                
 Gross $0 $0 $3,677 $3,677 $2,507 
 Ceded  0  0  85  85  85 
__________                
(1) - Reported within "Other assets" on MBIA's consolidated balance sheets.
(2) - Reported within "Other liabilities" on MBIA's consolidated balance sheets.

   Fair Value Measurements at Reporting Date Using      
   Quoted Prices in Significant Significant  Fair Value Carry Value
    Active Markets for  Other Observable Unobservable Balance as of  Balance as of
    Identical Assets Inputs Inputs December 31, December 31,
In millions  (Level 1)  (Level 2)  (Level 3) 2012 2012
Assets:               
 Other investments $0 $0 $9 $9 $9
 Accrued investment income(1)  43  0  0  43  43
 Receivable for investments sold(1)  17  0  0  17  17
 Net cash collateral pledged(1)  66  0  0  66  66
Assets of consolidated VIEs:               
 Investments held-to-maturity  0  0  2,674  2,674  2,829
Total assets $126 $0 $2,683 $2,809 $2,964
Liabilities:               
 Investment agreements $0 $0 $1,175 $1,175 $944
 Medium-term notes  0  0  860  860  1,433
 Long-term debt  0  692  0  692  1,662
 Payable for investments purchased(2)  50  0  0  50  50
 Accrued interest expense(2)  9  10  0  19  70
Liabilities of consolidated VIEs:               
 Variable interest entity notes  0  0  3,147  3,147  3,465
Total liabilities $59 $702 $5,182 $5,943 $7,624
Financial Guarantees:               
 Gross $0 $0 $650 $650 $143
 Ceded  0  0  97  97  91
__________               
(1) - Reported within "Other assets" on MBIA's consolidated balance sheets.
(2) - Reported within "Other liabilities" on MBIA's consolidated balance sheets.
Changes In Level 3 Assets Measured At Fair Value On A Recurring Basis
Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Three Months Ended June 30, 2013
                                      Change in
                                      Unrealized
                                      Gains
                                      (Losses) for
                                      the Period
                                      Included in
        Unrealized                            Earnings
        Gains / Unrealized Foreign                      for Assets
        (Losses) Gains / Exchange                      still held
  Balance, Realized Included (Losses) Recognized             Transfers Transfers    as of
  Beginning Gains / in Included in OCI or             into out of Ending June 30,
In millions of Period (Losses) Earnings in OCI Earnings Purchases Issuances Settlements Sales Level 3(1) Level 3(1) Balance 2013
Assets:                                       
Foreign governments $8 $0 $0 $0 $0 $0 $0 $(8) $0 $3 $0 $3 $0
Corporate obligations  57  0  1  3  0  2  0  0  0  0  0  63  1
Residential mortgage-                                       
backed agency  0  0  0  0  0  0  0  0  0  3  0  3  0
Residential mortgage-                                       
backed non-agency  1  0  0  0  0  0  0  0  0  0  0  1  0
Commercial                                       
mortgage-backed  13  0  0  0  0  0  0  0  0  0  0  13  0
Collateralized debt                                       
obligations  37  (1)  0  2  0  61  0  (8)  (5)  9  (10)  85  1
Other asset-backed  67  0  0  (1)  0  3  0  (3)  0  2  (4)  64  0
State and municipal                                       
bonds  23  0  0  0  0  0  0  (2)  0  42  0  63  0
Perpetual debt and equity securities  10  0  0  0  0  0  0  0  0  0  0  10  0
Assets of                                       
consolidated VIEs:                                       
Corporate obligations  79  (4)  (6)  6  0  0  0  (2)  (25)  0  0  48  (1)
Residential mortgage-                                       
backed non-agency  6  0  (1)  0  0  0  0  0  0  0  (3)  2  0
Commercial                                       
mortgage-backed  28  0  0  0  0  0  0  0  (24)  0  0  4  0
Collateralized debt                                       
obligations  117  0  0  5  0  0  0  (1)  (86)  0  0  35  3
Other asset-backed  47  0  14  0  0  0  0  (6)  (2)  10  0  63  11
Loans receivable  1,819  0  212  0  0  0  0  (68)  (173)  0  0  1,790  212
Loan repurchase                                       
commitments  1,176  0  49  0  0  0  0  (110)  0  0  0  1,115  49
Total assets $3,488 $(5) $269 $15 $0 $66 $0 $(208) $(315) $69 $(17) $3,362 $276

Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Three Months Ended June 30, 2012
                                      Change in
                                      Unrealized
                                      Gains
                                      (Losses) for
                                      the Period
                                      Included in
        Unrealized                            Earnings for
        Gains / Unrealized Foreign                      Assets
        (Losses) Gains / Exchange                      still held
  Balance, Realized Included (Losses) Recognized             Transfers Transfers    as of
  Beginning Gains / in Included in OCI or             into out of Ending June 30,
In millions of Period (Losses) Earnings in OCI Earnings Purchases Issuances Settlements Sales Level 3(1) Level 3(1) Balance 2012
Assets:                                       
Foreign governments $12 $0 $0 $0 $(1) $7 $0 $(3) $(3) $0 $0 $12 $0
Corporate obligations  185  0  2  13  (2)  16  0  (15)  (115)  14  0  98  2
Residential mortgage-                                       
backed agency  9  0  0  0  0  0  0  0  0  4  (9)  4  0
Residential mortgage-                                       
backed non-agency  14  0  0  (4)  0  0  0  (5)  (1)  26  0  30  0
Commercial                                       
mortgage-backed  25  0  0  2  0  0  0  0  0  0  0  27  0
Collateralized debt                                       
obligations  35  (1)  0  3  0  0  0  (4)  (7)  4  (1)  29  0
Other asset-backed  115  (2)  0  10  0  2  0  (2)  (50)  4  (5)  72  0
State and municipal                                       
bonds  27  0  0  0  0  0  0  (2)  0  0  0  25  0
Perpetual debt and equity securities  10  0  0  0  0  0  0  0  0  3  0  13  0
Assets of                                       
consolidated VIEs:                                       
Corporate obligations  75  0  (6)  (6)  0  28  0  (2)  0  6  0  95  0
Residential mortgage-                                       
backed non-agency  25  0  1  0  0  0  0  (2)  (15)  1  0  10  0
Commercial                                       
mortgage-backed  15  0  1  0  0  0  0  (1)  (8)  5  0  12  1
Collateralized debt                                       
obligations  218  0  (2)  (3)  0  0  0  0  (75)  2  0  140  6
Other asset-backed  71  0  3  0  0  4  0  (3)  (36)  3  0  42  2
Loans receivable  2,025  0  (49)  0  0  0  0  (71)  (2)  0  0  1,903  (49)
Loan repurchase                                       
commitments  1,076  0  (44)  0  0  0  0  0  0  0  0  1,032  (44)
Total assets $3,937 $(3) $(94) $15 $(3) $57 $0 $(110) $(312) $72 $(15) $3,544 $(82)

Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Six Months Ended June 30, 2013
                                      Change in
                                      Unrealized
                                      Gains
                                      (Losses) for
                                      the Period
                                      Included in
        Unrealized                            Earnings for
        Gains / Unrealized Foreign                      Assets
        (Losses) Gains / Exchange                      still held
  Balance, Realized Included (Losses) Recognized             Transfers Transfers    as of
  Beginning Gains / in Included in OCI or             into out of Ending June 30,
In millions of Year (Losses) Earnings in OCI Earnings Purchases Issuances Settlements Sales Level 3(1) Level 3(1) Balance 2013
Assets:                                       
Foreign governments $3 $0 $0 $0 $0 $0 $0 $(8) $0 $11 $(3) $3 $0
Corporate obligations  76  2  5  4  (1)  2  0  (1)  (24)  0  0  63  5
Residential mortgage-                                       
backed agency  0  0  0  0  0  0  0  0  0  3  0  3  0
Residential mortgage-                                       
backed non-agency  4  0  0  0  0  0  0  (3)  0  0  0  1  0
Commercial                                       
mortgage-backed  28  0  0  4  0  0  0  0  (19)  1  (1)  13  0
Collateralized debt                                       
obligations  31  (2)  0  4  0  61  0  (12)  (5)  19  (11)  85  1
Other asset-backed  26  0  0  (1)  0  4  0  (5)  0  44  (4)  64  0
State and municipal                                       
bonds  103  2  0  (1)  0  0  0  (3)  (12)  42  (68)  63  0
Perpetual debt and equity securities  14  0  0  0  (1)  0  0  0  0  0  (3)  10  0
Assets of                                       
consolidated VIEs:                                       
Corporate obligations  78  (4)  (8)  6  0  0  0  (3)  (24)  3  0  48  (1)
Residential mortgage-                                       
backed non-agency  6  0  6  0  0  0  0  (7)  0  1  (4)  2  0
Commercial                                       
mortgage-backed  7  0  1  0  0  0  0  0  (24)  20  0  4  1
Collateralized debt                                       
obligations  125  0  (9)  5  0  0  0  (1)  (85)  1  (1)  35  4
Other asset-backed  64  0  0  0  0  0  0  (9)  (2)  10  0  63  4
Loans receivable  1,881  0  221  0  0  0  0  (137)  (175)  0  0  1,790  207
Loan repurchase                                       
commitments  1,086  0  139  0  0  0  0  (110)  0  0  0  1,115  139
Total assets $3,532 $(2) $355 $21 $(2) $67 $0 $(299) $(370) $155 $(95) $3,362 $360

Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis for the Six Months Ended June 30, 2012
                                      Change in
                                      Unrealized
                                      Gains
                                      (Losses) for
                                      the Period
                                      Included in
        Unrealized                            Earnings for
        Gains / Unrealized Foreign                      Assets
        (Losses) Gains / Exchange                      still held
  Balance, Realized Included (Losses) Recognized             Transfers Transfers    as of
  Beginning Gains / in Included in OCI or             into out of Ending June 30,
In millions of Year (Losses) Earnings in OCI Earnings Purchases Issuances Settlements Sales Level 3(1) Level 3(1) Balance 2012
Assets:                                       
Foreign governments $11 $0 $0 $0 $0 $13 $0 $(9) $(3) $0 $0 $12 $0
Corporate obligations  207  (15)  5  26  0  15  0  (16)  (138)  14  0  98  5
Residential mortgage-                                       
backed agency  8  0  0  1  0  0  0  0  0  4  (9)  4  0
Residential mortgage-                                       
backed non-agency  17  0  0  (3)  0  0  0  (7)  (1)  26  (2)  30  0
Commercial                                       
mortgage-backed  24  0  0  4  0  0  0  0  0  0  (1)  27  0
Collateralized debt                                       
obligations  60  (4)  0  9  0  0  0  (9)  (10)  10  (27)  29  0
Other asset-backed  317  (61)  0  73  0  4  0  (8)  (252)  6  (7)  72  0
State and municipal                                       
bonds  28  0  0  0  0  0  0  (3)  0  0  0  25  0
Perpetual debt and equity securities  11  0  0  0  0  0  0  0  0  4  (2)  13  0
Assets of                                       
consolidated VIEs:                                       
Corporate obligations  69  0  (5)  (6)  0  28  0  (3)  0  12  0  95  1
Residential mortgage-                                       
backed non-agency  21  0  6  0  0  0  0  (4)  (15)  3  (1)  10  5
Commercial                                       
mortgage-backed  22  0  2  0  0  0  0  (3)  (8)  5  (6)  12  1
Collateralized debt                                       
obligations  203  0  0  (2)  0  0  0  0  (75)  14  0  140  7
Other asset-backed  67  0  5  0  0  4  0  (3)  (36)  5  0  42  4
Loans receivable  2,046  0  (10)  0  0  0  0  (131)  (2)  0  0  1,903  (10)
Loan repurchase                                       
commitments  1,077  0  (45)  0  0  0  0  0  0  0  0  1,032  (45)
Total assets $4,188 $(80) $(42) $102 $0 $64 $0 $(196) $(540) $103 $(55) $3,544 $(32)
Changes In Level 3 Liabilities Measured At Fair Value On A Recurring Basis
                                      Change in
                                      Unrealized
                                      (Gains)
                                      Losses for
                                      the Period
                                      Included in
        Unrealized                            Earnings for
        (Gains) / Unrealized Foreign                      Liabilities
        Losses (Gains) / Exchange                      still held
  Balance, Realized Included Losses Recognized             Transfers Transfers    as of
  Beginning (Gains) / in Included in OCI or             into out of Ending June 30,
In millions of Period Losses Earnings in OCI Earnings Purchases Issuances Settlements Sales Level 3(1) Level 3(1) Balance 2013
Liabilities:                                       
Medium-term notes $181 $0 $5 $0 $2 $0 $0 $0 $0 $0 $0 $188 $7
Credit derivatives, net  2,994  1,532  (1,350)  0  0  0  0  (1,532)  0  4  0  1,648  162
Interest rate                                       
derivatives, net  (1)  0  1  0  1  0  0  0  0  0  (1)  0  (6)
Currency                                       
derivatives, net  1  0  (1)  0  1  0  0  0  0  0  (1)  0  0
Liabilities of                                       
consolidated VIEs:                                       
VIE notes  1,901  0  24  0  0  0  0  (26)  (1,075)  0  0  824  24
Currency                                       
derivatives, net  23  0  (4)  0  (3)  0  0  0  0  0  0  16  (7)
Total liabilities $5,099 $1,532 $(1,325) $0 $1 $0 $0 $(1,558) $(1,075) $4 $(2) $2,676 $180
_______________                          
(1) - Transferred in and out at the end of the period.

                                      Change in
                                      Unrealized
                                      (Gains)
                                      Losses for
                                      the Period
                                      Included in
        Unrealized                            Earnings for
        (Gains) / Unrealized Foreign                      Liabilities
        Losses (Gains) / Exchange                      still held
  Balance, Realized Included Losses Recognized             Transfers Transfers    as of
  Beginning (Gains) / in Included in OCI or             into out of Ending June 30,
In millions of Period Losses Earnings in OCI Earnings Purchases Issuances Settlements Sales Level 3(1) Level 3(1) Balance 2012
Liabilities:                                       
Medium-term notes $174 $0 $(16) $0 $(7) $0 $0 $0 $0 $0 $0 $151 $(16)
Credit derivatives, net  4,487  443  (1,202)  0  0  0  0  (443)  0  0  0  3,285  (641)
Interest rate                                       
derivatives, net  (4)  0  0  0  0  0  0  0  0  0  0  (4)  0
Liabilities of                                        
consolidated VIEs:                                       
VIE notes  2,864  0  62  0  0  0  0  (76)  (983)  0  0  1,867  62
Credit derivatives, net  82  0  0  0  0  0  0  0  (82)  0  0  0  0
Currency derivatives,                                       
net  19  0  2  0  0  0  0  0  0  0  0  21  2
Total liabilities $7,622 $443 $(1,154) $0 $(7) $0 $0 $(519) $(1,065) $0 $0 $5,320 $(593)
_______________                                       
(1) - Transferred in and out at the end of the period.

                                      Change in
                                      Unrealized
                                      (Gains)
                                      Losses for
                                      the Period
                                      Included in
        Unrealized                            Earnings for
        (Gains) / Unrealized Foreign                      Liabilities
        Losses (Gains) / Exchange                      still held
  Balance, Realized Included Losses Recognized             Transfers Transfers    as of
  Beginning (Gains) / in Included in OCI or             into out of Ending June 30,
In millions of Year Losses Earnings in OCI Earnings Purchases Issuances Settlements Sales Level 3(1) Level 3(1) Balance 2013
Liabilities:                                       
Medium-term notes $165 $0 $25 $0 $(2) $0 $0 $0 $0 $0 $0 $188 $23
Credit derivatives, net  2,921  1,521  (1,277)  0  0  0  0  (1,521)  0  4  0  1,648  218
Interest rate                                       
derivatives, net  (1)  0  2  0  0  0  0  0  0  0  (1)  0  (6)
Currency                                       
derivatives, net  1  0  0  0  0  0  0  0  0  0  (1)  0  0
Liabilities of                                        
consolidated VIEs:                                       
VIE notes  1,932  0  146  0  0  0  0  (178)  (1,076)  0  0  824  59
Currency derivatives,                                       
net  21  0  (5)  0  0  0  0  0  0  0  0  16  (5)
Total liabilities $5,039 $1,521 $(1,109) $0 $(2) $0 $0 $(1,699) $(1,076) $4 $(2) $2,676 $289
_______________                                       
(1) - Transferred in and out at the end of the period.

                                      Change in
                                      Unrealized
                                      (Gains)
                                      Losses for
                                      the Period
                                      Included in
        Unrealized                            Earnings for
        (Gains) / Unrealized Foreign                      Liabilities
        Losses (Gains) / Exchange                      still held
  Balance, Realized Included Losses Recognized             Transfers Transfers    as of
  Beginning (Gains) / in Included in OCI or             into out of Ending June 30,
In millions of Year Losses Earnings in OCI Earnings Purchases Issuances Settlements Sales Level 3(1) Level 3(1) Balance 2012
Liabilities:                                       
Medium-term notes $165 $0 $(11) $0 $(3) $0 $0 $0 $0 $0 $0 $151 $(11)
Credit derivatives, net  4,790  463  (1,505)  0  0  0  0  (463)  0  0  0  3,285  (571)
Interest rate                                       
derivatives, net  (3)  0  (1)  0  0  0  0  0  0  0  0  (4)  7
Liabilities of                                        
consolidated VIEs:                                       
VIE notes  2,889  0  221  0  0  0  0  (260)  (983)  0  0  1,867  165
Credit derivatives, net  80  0  2  0  0  0  0  0  (82)  0  0  0  0
Currency derivatives,                                       
net  17  0  4  0  0  0  0  0  0  0  0  21  4
Total liabilities $7,938 $463 $(1,290) $0 $(3) $0 $0 $(723) $(1,065) $0 $0 $5,320 $(406)
_______________                                       
(1) - Transferred in and out at the end of the period.
Gains And Losses (Realized And Unrealized) Included In Earnings Pertaining To Level 3 Assets And Liabilities
              
   Three Months Ended June 30, 2013 Three Months Ended June 30, 2012
      Change in     Change in
      Unrealized    Unrealized
      Gains (Losses)    Gains (Losses)
      for the     for the
      Period Included    Period Included
      in Earnings     in Earnings
      for Assets    for Assets
     and     and
   Total Gains Liabilities still  Total Gains Liabilities still
   (Losses) held as of  (Losses) held as of
   Included June 30, Included June 30,
In millions in Earnings 2013 in Earnings 2012
Revenues:            
 Unrealized gains (losses) on            
  insured derivatives $1,350 $(162) $1,202 $641
 Realized gains (losses) and other            
  settlements on insured derivatives  (1,532)  0  (443)  0
 Net gains (losses) on financial instruments            
  at fair value and foreign exchange  (8)  1  18  18
 Net investment losses related to             
  other-than-temporary impairments  0  0  (3)  0
 Revenues of consolidated VIEs:            
  Net gains (losses) on financial instruments             
  at fair value and foreign exchange  244  257  (160)  (148)
Total $54 $96 $614 $511

              
   Six Months Ended June 30, 2013 Six Months Ended June 30, 2012
      Change in     Change in
      Unrealized    Unrealized
      Gains (Losses)    Gains (Losses)
      for the     for the
      Period Included    Period Included
      in Earnings     in Earnings
      for Assets    for Assets
     and     and
   Total Gains Liabilities still  Total Gains Liabilities still
   (Losses) held as of  (Losses) held as of
   Included June 30, Included June 30,
In millions in Earnings 2013 in Earnings 2012
Revenues:            
 Net investment income  $0 $0 $(5) $0
 Unrealized gains (losses) on            
  insured derivatives  1,277  (218)  1,505  571
 Realized gains (losses) and other            
  settlements on insured derivatives  (1,521)  0  (463)  0
 Net gains (losses) on financial instruments            
  at fair value and foreign exchange  (18)  (11)  2  9
 Net investment losses related to             
  other-than-temporary impairments  0  0  (60)  0
 Revenues of consolidated VIEs:            
  Net gains (losses) on financial instruments             
  at fair value and foreign exchange  205  300  (274)  (206)
Total $(57) $71 $705 $374
Changes In Fair Value Included In The Company's Consolidated Statements Of Operations
   Net Gains (Losses) on Financial Instruments  
   at Fair Value and Foreign Exchange 
   Three Months Ended June 30, Six Months Ended June 30, 
In millions 2013 2012 2013 2012 
Fixed-maturity securities held at fair value $ (16) $ (56) $2 $(57) 
Loans receivable at fair value:             
 Residential mortgage loans   145   (117)  71  (99) 
 Other loans   -   (2)  13  (41) 
Loan repurchase commitments   50   44  139  43 
Long-term debt   (160)   135  (79)  128 
Difference Between Aggregate Fair Value And The Aggregate Remaining Contractual Principal Balance Outstanding
   As of June 30, 2013  As of December 31, 2012
   Contractual       Contractual      
   Outstanding Fair    Outstanding Fair   
In millions Principal Value Difference Principal Value Difference
Loans receivable at fair value:                  
 Residential mortgage loans $2,025 $1,704 $321 $2,307 $1,735 $572
 Residential mortgage loans (90 days or more past due)  228  86  142  244  54  190
 Other loans  0  0  0  22  22  0
 Other loans (90 days or more past due)  0  0  0  197  70  127
Total loans receivable at fair value $2,253 $1,790 $463 $2,770 $1,881 $889
                    
Variable interest entity notes $4,013 $2,590 $1,423 $9,021 $3,659 $5,362