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Investments (tables)
 12 Months Ended
Dec. 31, 2013
Investments disclosure  
Amortized cost and fair value of investments in fixed maturities [Table Text Block]

 

 

 
    
   Gross Unrealized    
  
 
   Amortized
Cost		   Fair
Value		  
(at December 31, 2013, in millions)
  Gains   Losses  

U.S. Treasury securities and obligations of U.S. government and government agencies and authorities

   $ 2,288   $ 39   $ 12   $ 2,315  

Obligations of states, municipalities and political subdivisions:

                          

Pre-refunded

     9,074     445     1     9,518  

All other

     25,414     991     361     26,044  
                   

Total obligations of states, municipalities and political subdivisions

     34,488     1,436     362     35,562  

Debt securities issued by foreign governments

     2,552     33     8     2,577  

Mortgage-backed securities, collateralized mortgage obligations and pass-through securities

     2,263     179     18     2,424  

All other corporate bonds

     20,472     767     299     20,940  

Redeemable preferred stock

     133     6     1     138  
                   

Total

   $ 62,196   $ 2,460   $ 700   $ 63,956  
                   
                   


 

 
    
   Gross Unrealized    
  
 
   Amortized
Cost		   Fair
Value		  
(at December 31, 2012, in millions)
  Gains   Losses  

U.S. Treasury securities and obligations of U.S. government and government agencies and authorities

   $ 2,148   $ 75   $ 1   $ 2,222  

Obligations of states, municipalities and political subdivisions:

                          

Pre-refunded

     8,458     567     —     9,025  

All other

     27,405     2,262     11     29,656  
                   

Total obligations of states, municipalities and political subdivisions

     35,863     2,829     11     38,681  

Debt securities issued by foreign governments

     2,185     72     —     2,257  

Mortgage-backed securities, collateralized mortgage obligations and pass-through securities

     2,744     255     2     2,997  

All other corporate bonds

     17,863     1,360     20     19,203  

Redeemable preferred stock

     26     7     —     33  
                   

Total

   $ 60,829   $ 4,598   $ 34   $ 65,393  
                   
                   

        
Amortized cost and fair value of fixed maturities by contractual maturity [Table Text Block]

 

 

(at December 31, 2013, in millions)
  Amortized
Cost		   Fair
Value		  

Due in one year or less

   $ 8,386   $ 8,525  

Due after 1 year through 5 years

     20,359     21,407  

Due after 5 years through 10 years

     17,225     17,579  

Due after 10 years

     13,963     14,021  
           

 

     59,933     61,532  

Mortgage-backed securities, collateralized mortgage obligations and pass-through securities

     2,263     2,424  
           

Total

   $ 62,196   $ 63,956  
           
           

        
Cost and fair value of investments in equity securities [Table Text Block]

 

 

 
    
   Gross Unrealized    
  
 
    
   Fair
Value		  
(at December 31, 2013, in millions)
  Cost   Gains   Losses  

Common stock

   $ 385   $ 226   $ 1   $ 610  

Non-redeemable preferred stock

     301     34     2     333  
                   

Total

   $ 686   $ 260   $ 3   $ 943  
                   
                   

 

 
    
   Gross Unrealized    
  
 
    
   Fair
Value		  
(at December 31, 2012, in millions)
  Cost   Gains   Losses  

Common stock

   $ 366   $ 148   $ 4   $ 510  

Non-redeemable preferred stock

     96     39     —     135  
                   

Total

   $ 462   $ 187   $ 4   $ 645  
                   
                   
Unrealized investment losses [Table Text Block]

 

 

 
   Less than 12 months   12 months or longer   Total  
(at December 31, 2013, in millions)
  Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		  

Fixed maturities

                                      

U.S. Treasury securities and obligations of U.S. government and government agencies and authorities

   $ 433   $ 12   $ —   $ —   $ 433   $ 12  

Obligations of states, municipalities and political subdivisions

     4,785     298     432     64     5,217     362  

Debt securities issued by foreign governments

     907     8     1     —     908     8  

Mortgage-backed securities, collateralized mortgage obligations and pass-through securities

     542     17     21     1     563     18  

All other corporate bonds

     6,887     253     421     46     7,308     299  

Redeemable preferred stock

     82     1     —     —     82     1  
                           

Total fixed maturities

     13,636     589     875     111     14,511     700  
                           

Equity securities

                                      

Common stock

     53     1     —     —     53     1  

Non-redeemable preferred stock

     147     2     —     —     147     2  
                           

Total equity securities

     200     3     —     —     200     3  
                           

Total

   $ 13,836   $ 592   $ 875   $ 111   $ 14,711   $ 703  
                           
                           


 

 
   Less than 12 months   12 months or longer   Total  
(at December 31, 2012, in millions)
  Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		   Fair
Value		   Gross
Unrealized
Losses		  

Fixed maturities

                                      

U.S. Treasury securities and obligations of U.S. government and government agencies and authorities

   $ 589   $ 1   $ —   $ —   $ 589   $ 1  

Obligations of states, municipalities and political subdivisions

     611     9     45     2     656     11  

Debt securities issued by foreign governments

     186     —     2     —     188     —  

Mortgage-backed securities, collateralized mortgage obligations and pass-through securities

     70     —     36     2     106     2  

All other corporate bonds

     1,097     13     89     7     1,186     20  
                           

Total fixed maturities

     2,553     23     172     11     2,725     34  
                           

Equity securities

                                      

Common stock

     40     4     —     —     40     4  

Non-redeemable preferred stock

     13     —     —     —     13     —  
                           

Total equity securities

     53     4     —     —     53     4  
                           

Total

   $ 2,606   $ 27   $ 172   $ 11   $ 2,778   $ 38  
                           
                           

        
Securities continuously in an unrealized loss position of greater than 20% of amortized cost by length of time [Table Text Block]

 

 

 
   Period For Which Fair Value Is Less Than 80% of Amortized Cost  
(in millions)
  3 Months
or Less		   Greater Than
3 Months,
6 Months
or Less		   Greater Than
6 Months,
12 Months
or Less		   Greater Than
12 Months		   Total  

Fixed maturities

                                

Mortgage-backed securities

   $ —   $ —   $ —   $ —   $ —  

Other

     7     3     1     3     14  
                       

Total fixed maturities

     7     3     1     3     14  

Equity securities

     —     —     —     —     —  
                       

Total

   $ 7   $ 3   $ 1   $ 3   $ 14  
                       
                       

        
Impairment charges included in net realized investment gains [Table Text Block]

 

(for the year ended December 31, in millions)
  2013   2012   2011  

Fixed maturities

                    

U.S. Treasury securities and obligations of U.S. government and government agencies and authorities

   $ —   $ —   $ —  

Obligations of states, municipalities and political subdivisions

     —     —     —  

Debt securities issued by foreign governments

     —     —     —  

Mortgage-backed securities, collateralized mortgage obligations and pass-through securities

     2     4     13  

All other corporate bonds

     3     4     5  

Redeemable preferred stock

     —     —     —  
               

Total fixed maturities

     5     8     18  
               

Equity securities

    
 		    
 		    
 		  

Common stock

     5     3     6  

Non-redeemable preferred stock

     —     1     —  
               

Total equity securities

     5     4     6  
               

Other investments

     5     3     1  
               

Total

   $ 15   $ 15   $ 25  
               
               
Roll-forward of the credit component of other-than-temporary impairments on fixed maturities recognized in the consolidated statement of income for which a portion of the other-than-temporary impairment was recognized in other comprehensive income [Table Text Block]

 

Year ended December 31, 2013
(in millions)
  Cumulative
OTTI Credit
Losses
Recognized for
Securities Held,
Beginning of
Period		   Additions for
OTTI Securities
Where No
Credit Losses
Were
Previously
Recognized		   Additions for
OTTI Securities
Where Credit
Losses Have
Been
Previously
Recognized		   Reductions
Due to
Sales/Defaults
of Credit-
Impaired
Securities		   Adjustments to
Book Value
of Credit-
Impaired
Securities due
to Changes in
Cash Flows		   Cumulative OTTI
Credit Losses
Recognized for
Securities Still
Held, End of
Period		  

Fixed maturities

                                      

Mortgage-backed securities, collateralized mortgage obligations and pass-through securities

   $ 63   $ —   $ 2   $ —   $ 4   $ 69  

All other corporate bonds

     102     3     —     (7 )   3     101  
                           

Total fixed maturities

   $ 165   $ 3   $ 2   $ (7 ) $ 7   $ 170  
                           
                           

 

Year ended December 31, 2012
(in millions)
  Cumulative
OTTI Credit
Losses
Recognized for
Securities Held,
Beginning of
Period		   Additions for
OTTI Securities
Where No
Credit Losses
Were
Previously
Recognized		   Additions for
OTTI Securities
Where Credit
Losses Have
Been
Previously
Recognized		   Reductions
Due to
Sales/Defaults
of Credit-
Impaired
Securities		   Adjustments to
Book Value
of Credit-
Impaired
Securities due
to Changes in
Cash Flows		   Cumulative OTTI
Credit Losses
Recognized for
Securities Still
Held, End of
Period		  

Fixed maturities

                                      

Mortgage-backed securities, collateralized mortgage obligations and pass-through securities

   $ 58   $ —   $ 4   $ (1 ) $ 2   $ 63  

All other corporate bonds

     94     —     4     —     4     102  
                           

Total fixed maturities

   $ 152   $ —   $ 8   $ (1 ) $ 6   $ 165  
                           
                           
Net investment income [Table Text Block]

 

(for the year ended December 31, in millions)
  2013   2012   2011  

Gross investment income

                    

Fixed maturities

   $ 2,310   $ 2,439   $ 2,543  

Equity securities

     31     28     29  

Short-term securities

     11     10     12  

Real estate

     37     34     34  

Other investments

     364     414     292  
               

Gross investment income

     2,753     2,925     2,910  

Investment expenses

     37     36     31  
               

Net investment income

   $ 2,716   $ 2,889   $ 2,879  
               
               
Changes in net unrealized investment gains [Table Text Block]

 

(at and for the year ended December 31, in millions)
  2013   2012   2011  

Changes in net unrealized investment gains

                    

Fixed maturities

   $ (2,804 ) $ 326   $ 1,588  

Equity securities

     74     38     (2 )

Other investments

     (1 )   (2 )   (14 )
               

Change in net pretax unrealized gains on investment securities

     (2,731 )   362     1,572  

Related tax expense (benefit)

     (950 )   130     560  
               

Change in net unrealized gains on investment securities

     (1,781 )   232     1,012  

Balance, beginning of year

     3,103     2,871     1,859  
               

Balance, end of year

   $ 1,322   $ 3,103   $ 2,871