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Investments (Tables)
12 Months Ended
Dec. 31, 2013
Text Block [Abstract]  
Amortized Cost And Fair Value Of Available-For-Sale And Held-To-Maturity Investment Portfolios
      December 31, 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 $528 $16 $(9) $535 $0
 State and municipal bonds  1,831  22  (73)  1,780  0
 Foreign governments  184  5  0  189  0
 Corporate obligations  1,682  24  (38)  1,668  0
 Mortgage-backed securities:               
  Residential mortgage-backed agency  1,167  10  (31)  1,146  0
  Residential mortgage-backed non-agency  79  13  (5)  87  4
  Commercial mortgage-backed  34  1  (1)  34  0
 Asset-backed securities:               
  Collateralized debt obligations  205  3  (57)  151  (14)
  Other asset-backed  187  2  (15)  174  0
   Total fixed-maturity investments  5,897  96  (229)  5,764  (10)
Money market securities  781  0  0  781  0
Perpetual debt and equity securities  10  1  0  11  0
Assets of consolidated VIEs:               
 Money market securities  136  0  0  136  0
Total AFS investments $6,824 $97 $(229) $6,692 $(10)
                    
HTM Investments               
Assets of consolidated VIEs:               
 Corporate obligations $2,801 $31 $(181) $2,651 $0
Total HTM investments $2,801 $31 $(181) $2,651 $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 $521 $521 $0 $0
Due after one year through five years  992  1,006  0  0
Due after five years through ten years  1,021  1,006  0  0
Due after ten years  1,691  1,639  2,801  2,651
Mortgage-backed and asset-backed  1,672  1,592  0  0
Total fixed-maturity investments $5,897 $5,764 $2,801 $2,651
Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments
      December 31, 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 $269 $(9) $1 $0 $270 $(9)
 State and municipal bonds  1,112  (65)  49  (8)  1,161  (73)
 Foreign governments  36  0  0  0  36  0
 Corporate obligations  788  (30)  82  (8)  870  (38)
 Mortgage-backed securities:                  
  Residential mortgage-backed agency  713  (23)  144  (8)  857  (31)
  Residential mortgage-backed non-agency  17  0  22  (5)  39  (5)
  Commercial mortgage-backed  11  (1)  0  0  11  (1)
 Asset-backed securities:                  
  Collateralized debt obligations  6  0  124  (57)  130  (57)
  Other asset-backed  21  0  57  (15)  78  (15)
   Total fixed-maturity investments  2,973  (128)  479  (101)  3,452  (229)
Perpetual debt and equity securities  5  0  0  0  5  0
Total AFS investments $2,978 $(128) $479 $(101) $3,457 $(229)
                       
HTM Investments                  
Assets of consolidated VIEs:                  
 Corporate obligations $0 $0 $1,244 $(181) $1,244 $(181)
Total HTM investments $0 $0 $1,244 $(181) $1,244 $(181)

      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%  25 $263 $244  - $0 $0
 > 15% to 25%  9  53  42  -  0  0
 > 25% to 50%  8  71  50  1  575  406
 > 50%  7  57  11  -  0  0
 Total  49 $444 $347  1 $575 $406
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  $16 $0 $62 $(4) $1 $0 $2 $0 $126 $(68) $1 $0 $208 $(72)
MBS  868  (31)  7  0  4  0  6  (1)  7  (1)  15  (4)  907  (37)
Corporate obligations  151  (1)  238  (9)  275  (12)  76  (5)  17  (1)  113  (10)  870  (38)
 Total $1,035 $(32) $307 $(13) $280 $(12) $84 $(6) $150 $(70) $129 $(14) $1,985 $(147)
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 $97 63%
MBS Below Investment Grade Below Investment Grade  7 81%
Corporate obligations Baa Baa  0 0%
Significant Inputs Used In Measurement Of Credit Losses On Securities
    Years Ended December 31,
Significant Inputs  2012 2011
Expected size of losses(1):     
 Range(2)  12.13% to 97.70% 2.48% to 100.00%
 Weighted average(3)  87.67% 55.40%
Current subordination levels(4):     
 Range(2)  0.00% to 0.00% 0.00% to 35.46%
 Weighted average(3)  0.00% 1.53%
Prepayment speed (annual CPR)(5):     
 Range(2)  0.00% to 30.91% 0.00% to 100.00%
 Weighted average(3)  11.93% 12.67%
_______________     
(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) $144 $(55) $16 
  Other  9  (4)  0 
   Total asset-backed  153  (59)  16 
 Mortgage-backed:          
  MBIA(1)  5  0  0 
  Other  4  0  0 
   Total mortgage-backed  9  0  0 
 Corporate obligations:          
  Other  6  (2)  0 
   Total corporate obligations  6  (2)  0 
 Other:          
  MBIA(1)  102  (10)  0 
  Other  31  (1)  0 
   Total other  133  (11)  0 
 Total $301 $(72) $16 
 _______________          
 (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 Years Ended December 31, 
Credit Losses Recognized in Earnings Related to OTTI 2013 2012 2011 
Beginning balance $197 $341 $262 
Additions for credit loss impairments recognized in the          
 current period on securities not previously impaired  0  0  63 
Additions for credit loss impairments recognized in the          
 current period on securities previously impaired  0  8  31 
Additions for credit loss impairments recognized in prior periods for securities          
Reductions for credit loss impairments previously recognized          
 on securities sold during the period  (16)  (41)  (15) 
Reductions for credit loss impairments previously recognized on securities          
 impaired to fair value during the period(1)  0  (111)  0 
Reductions for increases in cash flows expected to be collected over the          
 remaining life of the security  (6)  0  0 
Ending balance $175 $197 $341 
_______________          
(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
    Years Ended December 31, 
 In millions 2013 2012 2011 
 Proceeds from sales $3,965 $8,724 $9,866 
 Gross realized gains  $57 $196 $239 
 Gross realized losses $(29) $(127) $(104)