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Investments (tables)
 12 Months Ended
Dec. 31, 2014
Investments disclosure  
Amortized cost and fair value of investments in fixed maturities [Table Text Block]

 

 

 
    
   Gross Unrealized    
  
 
   Amortized
Cost		   Fair
Value		  
(at December 31, 2014, in millions)
  Gains   Losses  

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

   $ 2,022   $ 36   $ 5   $ 2,053  

Obligations of states, municipalities and political subdivisions:

                          

Pre-refunded

     7,229     332     —     7,561  

All other

     24,666     1,356     10     26,012  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total obligations of states, municipalities and political subdivisions

     31,895     1,688     10     33,573  

Debt securities issued by foreign governments

     2,320     48     —     2,368  

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

     2,052     165     4     2,213  

All other corporate bonds

     22,390     844     99     23,135  

Redeemable preferred stock

     122     10     —     132  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 60,801   $ 2,791   $ 118   $ 63,474  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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

 

(at December 31, 2014, in millions)
  Amortized
Cost		   Fair
Value		  

Due in one year or less

   $ 7,762   $ 7,859  

Due after 1 year through 5 years

     18,447     19,325  

Due after 5 years through 10 years

     16,815     17,462  

Due after 10 years

     15,725     16,615  
​ ​ ​ ​ ​ ​ ​ ​

 

     58,749     61,261  

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

     2,052     2,213  
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 60,801   $ 63,474  
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
Cost and fair value of investments in equity securities [Table Text Block]

 

 
    
   Gross
Unrealized		    
  
 
    
   Fair
Value		  
(at December 31, 2014, in millions)
  Cost   Gains   Losses  

Public common stock

   $ 400   $ 295   $ 4   $ 691  

Non-redeemable preferred stock

     179     31     2     208  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 579   $ 326   $ 6   $ 899  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


 

 

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

Public common stock

   $ 385   $ 226   $ 1   $ 610  

Non-redeemable preferred stock

     301     34     2     333  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 686   $ 260   $ 3   $ 943  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Unrealized investment losses [Table Text Block]

 

 
   Less than 12 months   12 months or longer   Total  
(at December 31, 2014, 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

   $ 180   $ 2   $ 125   $ 3   $ 305   $ 5  

Obligations of states, municipalities and political subdivisions

     173     1     797     9     970     10  

Debt securities issued by foreign governments

     50     —     24     —     74     —  

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

     68     —     192     4     260     4  

All other corporate bonds

     2,148     38     2,355     61     4,503     99  

Redeemable preferred stock

     —     —     —     —     —     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

     2,619     41     3,493     77     6,112     118  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Equity securities

                                      

Public common stock

     81     4     1     —     82     4  

Non-redeemable preferred stock

     44     1     42     1     86     2  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total equity securities

     125     5     43     1     168     6  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 2,744   $ 46   $ 3,536   $ 78   $ 6,280   $ 124  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


 

 

 
   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

                                      

Public 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  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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

     4     —     2     2     8  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

     4     —     2     2     8  

Equity securities

     —     —     —     —     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 4   $ —   $ 2   $ 2   $ 8  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Impairment charges included in net realized investment gains [Table Text Block]

 

(for the year ended December 31, in millions)
  2014   2013   2012  

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

     1     2     4  

All other corporate bonds

     15     3     4  

Redeemable preferred stock

     —     —     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

     16     5     8  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Equity securities

    
 		    
 		    
 		  

Public common stock

     9     5     3  

Non-redeemable preferred stock

     —     —     1  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total equity securities

     9     5     4  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other investments

     1     5     3  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 26   $ 15   $ 15  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Cumulative amount of and the changes during the reporting period in the credit losses of other-than-temporary impairments (OTTI) on fixed maturities recognized in the consolidated statement of income for which a portion of the OTTI was recognized in other comprehensive income [Table Text Block]

 

Year ended December 31, 2014
(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

   $ 53   $ —   $ 1   $ (5 ) $ (9 ) $ 40  

All other corporate bonds

     65     —     3     (6 )   (3 )   59  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

   $ 118   $ —   $ 4   $ (11 ) $ (12 ) $ 99  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

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

   $ 55   $ —   $ 2   $ —   $ (4 ) $ 53  

All other corporate bonds

     72     3     —     (7 )   (3 )   65  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

   $ 127   $ 3   $ 2   $ (7 ) $ (7 ) $ 118  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Net investment income [Table Text Block]

 

(for the year ended December 31, in millions)
  2014   2013   2012  

Gross investment income

                    

Fixed maturities

   $ 2,244   $ 2,310   $ 2,439  

Equity securities

     40     31     28  

Short-term securities

     9     11     10  

Real estate

     44     37     34  

Other investments

     489     364     414  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Gross investment income

     2,826     2,753     2,925  

Investment expenses

     39     37     36  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net investment income

   $ 2,787   $ 2,716   $ 2,889  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Changes in net unrealized investment gains [Table Text Block]

 

(at and for the year ended December 31, in millions)
  2014   2013   2012  

Changes in net unrealized investment gains

                    

Fixed maturities

   $ 913   $ (2,804 ) $ 326  

Equity securities

     63     74     38  

Other investments

     2     (1 )   (2 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Change in net pretax unrealized gains on investment securities

     978     (2,731 )   362  

Related tax expense (benefit)

     334     (950 )   130  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Change in net unrealized gains on investment securities

     644     (1,781 )   232  

Balance, beginning of year

     1,322     3,103     2,871  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance, end of year

   $ 1,966   $ 1,322   $ 3,103  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​