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Investments (Tables)
 3 Months Ended
Mar. 31, 2014
Text Block [Abstract]  
Amortized Cost And Fair Value Of Available-For-Sale And Held-To-Maturity Investment Portfolios
      March 31, 2014
         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 $537 $24 $(7) $554 $0
 State and municipal bonds  1,860  49  (32)  1,877  0
 Foreign governments  266  6  0  272  0
 Corporate obligations  1,863  33  (34)  1,862  0
 Mortgage-backed securities:               
  Residential mortgage-backed agency  1,138  10  (22)  1,126  0
  Residential mortgage-backed non-agency  72  12  (4)  80  4
  Commercial mortgage-backed  38  1  (1)  38  0
 Asset-backed securities:               
  Collateralized debt obligations  202  4  (55)  151  (11)
  Other asset-backed  217  5  (12)  210  0
   Total fixed-maturity investments  6,193  144  (167)  6,170  (7)
Money market securities  576  0  0  576  0
Perpetual debt and equity securities  11  1  0  12  0
Assets of consolidated VIEs:               
 Money market securities  35  0  0  35  0
Total AFS investments $6,815 $145 $(167) $6,793 $(7)
                    
HTM Investments               
Assets of consolidated VIEs:               
 Corporate obligations $2,793 $57 $(155) $2,695 $0
Total HTM investments $2,793 $57 $(155) $2,695 $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, 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.
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 $664 $665 $0 $0
Due after one year through five years  1,259  1,280  0  0
Due after five years through ten years  919  923  0  0
Due after ten years  1,684  1,697  2,793  2,695
Mortgage-backed and asset-backed  1,667  1,605  0  0
Total fixed-maturity investments $6,193 $6,170 $2,793 $2,695
Gross Unrealized Losses Related To Available-For-Sale And Held-To-Maturity Investments
      March 31, 2014
      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 $261 $(7) $1 $0 $262 $(7)
 State and municipal bonds  639  (26)  54  (6)  693  (32)
 Foreign governments  110  0  0  0  110  0
 Corporate obligations  812  (29)  85  (5)  897  (34)
 Mortgage-backed securities:                  
  Residential mortgage-backed agency  592  (13)  193  (9)  785  (22)
  Residential mortgage-backed non-agency  5  0  22  (4)  27  (4)
  Commercial mortgage-backed  14  (1)  2  0  16  (1)
 Asset-backed securities:                  
  Collateralized debt obligations  2  0  127  (55)  129  (55)
  Other asset-backed  20  0  50  (12)  70  (12)
   Total fixed-maturity investments  2,455  (76)  534  (91)  2,989  (167)
Perpetual debt and equity securities  2  0  0  0  2  0
Total AFS investments $2,457 $(76) $534 $(91) $2,991 $(167)
                       
HTM Investments                  
Assets of consolidated VIEs:                  
 Corporate obligations $0 $0 $420 $(155) $420 $(155)
Total HTM investments $0 $0 $420 $(155) $420 $(155)

      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)
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 $245  - $0 $0
 > 15% to 25%  11  105  83  -  0  0
 > 25% to 50%  4  21  15  1  575  420
 > 50%  7  49  8  -  0  0
 Total  47 $438 $351  1 $575 $420
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 $61 $(3) $2 $0 $0 $0 $118 $(63) $2 $(1) $199 $(67)
MBS  787  (22)  9  0  2  0  6  0  9  (1)  15  (4)  828  (27)
Corporate obligations  281  0  187  (6)  259  (7)  45  (3)  15  0  110  (18)  897  (34)
 Total $1,084 $(22) $257 $(9) $263 $(7) $51 $(3) $142 $(64) $127 $(23) $1,924 $(128)
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 $90 61%
MBS Below Investment Grade Below Investment Grade  7 100%
Corporate obligations Baa Baa  0 0%
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) $139 $(54) $18 
  Other  8  (2)  0 
   Total asset-backed  147  (56)  18 
 Mortgage-backed:          
  MBIA(1)  5  0  0 
  Other  2  0  0 
   Total mortgage-backed  7  0  0 
 Corporate obligations:          
  Other  6  (1)  0 
   Total corporate obligations  6  (1)  0 
 Other:          
  MBIA(1)  64  (6)  0 
   Total other  64  (6)  0 
 Total $224 $(63) $18 
 _______________          
 (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 March 31, 
Credit Losses Recognized in Earnings Related to Other-Than-Temporary Impairments 2014  2013 
Beginning balance $175 $197 
Reductions for credit loss impairments previously recognized on securities sold during       
 the period  (1)  (2) 
Reductions for increases in cash flows expected to be collected over the remaining        
 life of the security  (1)  0 
Ending balance $173 $195 
Gross Realized Gains and Losses From Sales Of Available-For-Sale Securities
    Three Months Ended March 31, 
 In millions 2014 2013 
 Proceeds from sales  $16 $620 
         
 Gross realized gains $2 $36 
          
 Gross realized losses $0 $(3)