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Investments (Tables)
 12 Months Ended
Dec. 31, 2012
Investments [Tables] [Abstract]  
Fixed maturities and equity securities table
(In millions) 20122011
Included in fixed maturities:     
Trading securities (amortized cost: $1; $2) $ 1$ 2
Hybrid securities (amortized cost: $15; $26)   15  28
Total $ 16$ 30
Included in equity securities:     
Hybrid securities (amortized cost: $84; $90) $ 70$ 65
Amortized cost and fair value for fixed maturities table
 Amortized Fair
(In millions)CostValue
Due in one year or less$ 1,121$ 1,141
Due after one year through five years  5,211  5,633
Due after five years through ten years  5,283  5,973
Due after ten years  2,850  3,796
Mortgage and other asset-backed securities  1,000  1,146
Total$ 15,465$ 17,689
Gross unrealized appreciation (depreciation) fixed maturities table
(In millions)   December 31, 2012  
   UnrealizedUnrealized  
 AmortizedAppre-Depre-Fair
 CostciationciationValue
Federal government and agency$ 509$ 393$ -$ 902
State and local government  2,169  270  (2)  2,437
Foreign government  1,197  126  (1)  1,322
Corporate  10,590  1,308  (17)  11,881
Federal agency mortgage-backed   121  1  -  122
Other mortgage-backed  82  11  (4)  89
Other asset-backed  797  145  (6)  936
Total$ 15,465$ 2,254$ (30)$ 17,689
(In millions) December 31, 2011
Federal government and agency$ 552$ 406$ -$ 958
State and local government  2,185  274  (3)  2,456
Foreign government  1,173  103  (2)  1,274
Corporate  9,460  1,070  (45)  10,485
Federal agency mortgage-backed  9  -  -  9
Other mortgage-backed  73  10  (4)  79
Other asset-backed  777  160  (11)  926
Total$ 14,229$ 2,023$ (65)$ 16,187
         
Declines in fair value table
(Dollars in millions)December 31, 2012
 Fair Amortized UnrealizedNumber
 ValueCostDepreciationof Issues
Fixed maturities:       
One year or less:       
Investment grade$ 488$ 494$ (6)200
Below investment grade$ 123$ 125$ (2)67
More than one year:       
Investment grade$ 195$ 207$ (12)39
Below investment grade$ 26$ 36$ (10)14
Distribution of commercial mortgage loans table
(In millions)20122011
Property type    
Office buildings$ 866$ 1,014
Apartment buildings  571  705
Industrial  532  670
Hotels   463  542
Retail facilities  346  297
Other  73  73
Total$ 2,851$ 3,301
Geographic region    
Pacific$ 966$ 893
South Atlantic  730  870
New England  387  450
Central   352  511
Middle Atlantic  300  391
Mountain  116  186
Total$ 2,851$ 3,301
Financing Receivable Credit Quality Indicators Table [Text Block]
(In millions)   December 31, 2012   
  Debt Service Coverage Ratio  
  1.30x or 1.20x to 1.10x to 1.00x to Less than  
Loan-to-Value Ratios Greater 1.29x 1.19x 1.09x 1.00x Total
Below 50%$ 297$ 8$ -$ 50$ -$ 355
50% to 59%  614  104  25  52  -  795
60% to 69%  562  75  -  66  -  703
70% to 79%  194  143  132  4  16  489
80% to 89%  45  42  131  18  58  294
90% to 99%  14  30  -  -  58  102
100% or above  -  -  30  17  66  113
Total$ 1,726$ 402$ 318$ 207$ 198$ 2,851
(In millions)December 31, 2011
  Debt Service Coverage Ratio  
  1.30x or 1.20x to 1.10x to 1.00x to Less than  
Loan-to-Value Ratios Greater 1.29x 1.19x 1.09x 1.00x Total
Below 50%$ 225$ 55$ 3$ 50$ 9$ 342
50% to 59%  444  47  26  -  53  570
60% to 69%  646  140  42  -  77  905
70% to 79%  117  132  120  159  33  561
80% to 89%  99  81  79  72  71  402
90% to 99%  36  35  30  58  116  275
100% or above  -  10  50  51  135  246
Total$ 1,567$ 500$ 350$ 390$ 494$ 3,301
Impaired commercial mortgage loans and related valuation reserves table
(In millions) 2012 2011
  Gross  Reserves Net  Gross  Reserves Net
Impaired commercial mortgage loans with valuation reserves$ 72$ (7)$ 65 $ 154$ (19)$ 135
Impaired commercial mortgage loans with no valuation reserves  60  -  60   60  -  60
Total $ 132$ (7)$ 125 $ 214$ (19)$ 195
Schedule of Changes in Valuation Reserves For Commercial Mortgage Loans Table
(In millions)20122011
Reserve balance, January 1,$ 19$ 12
Increase in valuation reserves  10  16
Charge-offs upon sales and repayments, net of recoveries  (3)  (1)
Transfers to other long-term investments  (16)  -
Transfers to foreclosed real estate  (3)  (8)
     
Reserve balance, December 31,$ 7$ 19
Other long-term investments
(In millions)20122011
Real estate entities$ 823$ 665
Securities partnerships  343  298
Interest rate and foreign currency swaps  6  12
Mezzanine loans  31  31
Other  52  52
Total$ 1,255$ 1,058