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Investments (Tables)
9 Months Ended
Sep. 30, 2013
Text Block [Abstract]  
Amortized Cost And Fair Value Of Available-For-Sale And Held-To-Maturity Investment Portfolios
      September 30, 2013
         Gross Gross    Other-Than-
      Amortized Unrealized Unrealized Fair Temporary
In millions Cost Gains Losses Value Impairments(1)
AFS Investments               
Fixed-maturity investments:               
 U.S. Treasury and government agency $526 $19 $(8) $537 $0
 State and municipal bonds  1,632  30  (52)  1,610  0
 Foreign governments  192  9  0  201  0
 Corporate obligations  1,616  32  (26)  1,622  0
 Mortgage-backed securities:               
  Residential mortgage-backed agency  942  10  (18)  934  0
  Residential mortgage-backed non-agency  67  13  (6)  74  3
  Commercial mortgage-backed  34  1  (1)  34  0
 Asset-backed securities:               
  Collateralized debt obligations  210  2  (57)  155  (12)
  Other asset-backed  148  2  (17)  133  0
   Total fixed-maturity investments  5,367  118  (185)  5,300  (9)
Money market securities  911  0  0  911  0
Perpetual debt and equity securities  9  1  0  10  0
Assets of consolidated VIEs:               
 Money market securities  156  0  0  156  0
Total AFS investments $6,443 $119 $(185) $6,377 $(9)
                    
HTM Investments               
Assets of consolidated VIEs:               
 Corporate obligations $2,809 $8 $(251) $2,566 $0
Total HTM investments $2,809 $8 $(251) $2,566 $0
_______________               
(1) - Represents unrealized gains or losses on other than temporarily impaired securities recognized in AOCI, which includes the non-credit component of impairments, as well as all subsequent changes in fair value of such impaired securities reported in AOCI.

      December 31, 2012
         Gross Gross    Other-Than-
      Amortized Unrealized Unrealized Fair Temporary
In millions Cost Gains Losses Value Impairments(1)
AFS Investments               
Fixed-maturity investments:               
 U.S. Treasury and government agency $819 $40 $(1) $858 $0
 State and municipal bonds  1,446  97  (12)  1,531  0
 Foreign governments  183  13  0  196  0
 Corporate obligations  1,058  54  (20)  1,092  5
 Mortgage-backed securities:               
  Residential mortgage-backed agency  939  19  (1)  957  0
  Residential mortgage-backed non-agency  86  11  (8)  89  0
  Commercial mortgage-backed  46  0  (4)  42  0
 Asset-backed securities:               
  Collateralized debt obligations  161  1  (71)  91  (25)
  Other asset-backed  145  3  (11)  137  0
   Total fixed-maturity investments  4,883  238  (128)  4,993  (20)
Money market securities  580  0  0  580  0
Perpetual debt and equity securities   22  1  0  23  0
Assets of consolidated VIEs:               
 State and municipal bonds  38  3  0  41  0
 Corporate obligations  177  9  (6)  180  0
 Mortgage-backed securities:               
  Residential mortgage-backed non-agency  92  0  (10)  82  0
 Asset-backed securities:               
  Collateralized debt obligations  97  0  (8)  89  0
  Other asset-backed  23  0  0  23  0
 Money market securities  210  0  0  210  0
Total AFS investments $6,122 $251 $(152) $6,221 $(20)
                    
HTM Investments               
Assets of consolidated VIEs:               
 Corporate obligations $2,829 $2 $(157) $2,674 $0
Total HTM investments $2,829 $2 $(157) $2,674 $0
_______________               
(1) - Represents unrealized gains or losses on other than temporarily impaired securities recognized in AOCI, which includes the non-credit component of impairments, as well as all subsequent changes in fair value of such impaired securities reported in AOCI.
Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments
  AFS Securities HTM Securities
        Consolidated VIEs
  Amortized     Amortized    
In millions Cost Fair Value Cost Fair Value
Due in one year or less $551 $552 $0 $0
Due after one year through five years  913  929  0  0
Due after five years through ten years  926  925  0  0
Due after ten years  1,576  1,564  2,809  2,566
Mortgage-backed and asset-backed  1,401  1,330  0  0
Total fixed-maturity investments $5,367 $5,300 $2,809 $2,566
Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments
      September 30, 2013
      Less than 12 Months 12 Months or Longer Total
      Fair Unrealized Fair Unrealized Fair Unrealized
In millions Value Losses Value Losses Value Losses
AFS Investments                  
Fixed-maturity investments:                  
 U.S. Treasury and government agency $208 $(8) $2 $0 $210 $(8)
 State and municipal bonds  730  (48)  58  (4)  788  (52)
 Foreign governments  12  0  0  0  12  0
 Corporate obligations  610  (23)  20  (3)  630  (26)
 Mortgage-backed securities:                  
  Residential mortgage-backed agency  528  (18)  32  0  560  (18)
  Residential mortgage-backed non-agency  5  0  23  (6)  28  (6)
  Commercial mortgage-backed  22  (1)  1  0  23  (1)
 Asset-backed securities:                  
  Collateralized debt obligations  9  (1)  128  (56)  137  (57)
  Other asset-backed  22  0  56  (17)  78  (17)
   Total fixed-maturity investments  2,146  (99)  320  (86)  2,466  (185)
Perpetual debt and equity securities  4  0  0  0  4  0
Total AFS investments $2,150 $(99) $320 $(86) $2,470 $(185)
                       
HTM Investments                  
Assets of consolidated VIEs:                  
 Corporate obligations $0 $0 $1,174 $(251) $1,174 $(251)
Total HTM investments $0 $0 $1,174 $(251) $1,174 $(251)

      December 31, 2012
      Less than 12 Months 12 Months or Longer Total
      Fair Unrealized Fair Unrealized Fair Unrealized
In millions Value Losses Value Losses Value Losses
AFS Investments                  
Fixed-maturity investments:                  
 U.S. Treasury and government agency $234 $(1) $0 $0 $234 $(1)
 State and municipal bonds  69  0  87  (12)  156  (12)
 Foreign governments  11  0  1  0  12  0
 Corporate obligations  202  (2)  57  (18)  259  (20)
 Mortgage-backed securities:                  
  Residential mortgage-backed agency  173  (1)  38  0  211  (1)
  Residential mortgage-backed non-agency  4  0  28  (8)  32  (8)
  Commercial mortgage-backed  3  0  27  (4)  30  (4)
 Asset-backed securities:                  
  Collateralized debt obligations  1  0  80  (71)  81  (71)
  Other asset-backed  4  0  65  (11)  69  (11)
   Total fixed-maturity investments  701  (4)  383  (124)  1,084  (128)
Perpetual debt and equity securities  1  0  1  0  2  0
Assets of consolidated VIEs:                  
 Corporate obligations  0  0  31  (6)  31  (6)
 Mortgage-backed securities:                  
  Residential mortgage-backed non-agency  0  0  82  (10)  82  (10)
 Asset-backed securities:                  
  Collateralized debt obligations  0  0  85  (8)  85  (8)
Total AFS investments $702 $(4) $582 $(148) $1,284 $(152)
                       
HTM Investments                  
Assets of consolidated VIEs:                  
 Corporate obligations $297 $(19) $1,287 $(138) $1,584 $(157)
Total HTM investments $297 $(19) $1,287 $(138) $1,584 $(157)
Distribution Of Securities By Percentage Of Fair Value Below Book Value By More Than 5%
   AFS Securities HTM Securities
 Percentage of Fair Value Number of Book Value Fair Value Number of Book Value Fair Value
  Below Book Value Securities  (in millions)  (in millions) Securities  (in millions)  (in millions)
 > 5% to 15%  13 $110 $101  - $0 $0
 > 15% to 25%  12  66  52  -  0  0
 > 25% to 50%  5  53  36  1  575  345
 > 50%  8  52  9  -  0  0
 Total  38 $281 $198  1 $575 $345
Fair Values And Gross Unrealized Losses By Credit Rating Category Of ABS, MBS and Corporate Obligations
                           Below            
In millions Aaa Aa A Baa Investment Grade Not Rated Total
   Fair Unrealized Fair Unrealized Fair Unrealized Fair Unrealized Fair Unrealized Fair Unrealized Fair Unrealized
Asset Type Value Loss Value Loss Value Loss Value Loss Value Loss Value Loss Value Loss
ABS  $13 $0 $59 $(5) $1 $0 $3 $0 $135 $(69) $4 $0 $215 $(74)
MBS  558  (18)  8  0  4  0  17  (1)  9  (1)  15  (5)  611  (25)
Corporate obligations  129  (1)  205  (8)  205  (12)  74  (4)  17  (1)  0  0  630  (26)
 Total $700 $(19) $272 $(13) $210 $(12) $94 $(5) $161 $(71) $19 $(5) $1,456 $(125)
Average Credit Ratings and Fair Value and Percentage Of Guaranteed ABS MBS and Corporate Obligations Below Investment Grade
      Insured Securities Rated Below
      Investment Grade without the
      Effect of Guarantee
  Average Credit Rating with the Average Credit Rating without the (in millions)   
Asset Type Effect of Guarantee Effect of Guarantee Fair Value Percentage
ABS Below investment grade Below investment grade $101 64%
MBS Baa Below investment grade  20 99%
Corporate obligations A A  0 0%
Significant Inputs Used In Measurement Of Credit Losses On Securities
    Nine Months Ended September 30,
Asset-backed Securities  2012
Expected size of losses(1):   
 Range(2)  12.13% to 97.70%
 Weighted average(3)  88.48%
Current subordination levels(4):   
 Range(2)  0.00% to 0.00%
 Weighted average(3)  0.00%
Prepayment speed (annual constant prepayment rate)(5):   
 Range(2)  0.00% to 30.91%
 Weighted average(3)  12.16%
_______________   
(1) - Represents future expected credit losses on impaired assets expressed as a percentage of total outstanding balance.
(2) - Represents the range of inputs/assumptions based upon the individual securities within each category.
(3) - Calculated by weighting the relevant input/assumption for each individual security by the outstanding notional of the security.
(4) - Represents current level of credit protection (subordination) for the securities, expressed as a percentage of the balance of the collateral group backing the bond.
(5) - Values represent high and low points of lifetime vectors of constant prepayment rates.
Securities Held In Unrealized Loss Position And Insured By Financial Guarantor and The Related Insurance Loss Reserve On Company Insured Investments
       Unrealized Insurance Loss 
 In millions Fair Value Loss Reserve (2) 
 Asset-backed:          
  MBIA(1) $148 $(58) $15 
  Other  9  (5)  0 
   Total asset-backed  157  (63)  15 
 Mortgage-backed:          
  MBIA(1)  5  0  0 
  Other  15  0  0 
   Total mortgage-backed  20  0  0 
 Corporate obligations:          
  Other  6  (2)  0 
   Total corporate obligations  6  (2)  0 
 Other:          
  MBIA(1)  104  (6)  0 
  Other  19  0  0 
   Total other  123  (6)  0 
 Total $306 $(71) $15 
 _______________          
 (1) - Includes investments insured by MBIA Corp. and National. 
 (2) - Insurance loss reserve estimates are based on the proportion of par value owned to the total amount of par value insured. 
Credit Losses Recognized In Earnings Related To OTTI Losses Recognized In Accumulated Other Comprehensive Income (Loss)
In millions Three Months Ended September 30, Nine Months Ended September 30,
Credit Losses Recognized in Earnings Related to Other-Than-Temporary Impairments 2013  2012 2013  2012
Beginning balance $186 $269 $197 $341
Additions for credit loss impairments recognized in the current period on securities             
 previously impaired  0  5  0  8
Reductions for credit loss impairments previously recognized on securities sold during            
 the period  (4)  (2)  (14)  (18)
Reductions for credit loss impairments previously recognized on securities impaired to            
 fair value during the period(1)  0  (52)  0  (111)
Reductions for increases in cash flows expected to be collected over the remaining             
 life of the security  (4)  0  (5)  0
Ending balance $178 $220 $178 $220
_______________            
(1) - Represents circumstances where the Company determined in the current period that it intends to sell the security or it is more likely than not that it will be required to sell the security
before recovery of the security's amortized cost.      
              
Gross Realized Gains and Losses From Sales Of Available-For-Sale Securities
    Three Months Ended September 30, Nine Months Ended September 30, 
 In millions 2013 2012 2013 2012 
 Proceeds from sales  $695 $1,163 $3,009 $5,697 
               
 Gross realized gains $4 $42 $52 $100 
                
 Gross realized losses $(15) $(6) $(25) $(101)