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Investments (tables)
 12 Months Ended
Dec. 31, 2015
Investments disclosure  
Amortized cost and fair value of investments in fixed maturities [Table Text Block]

 

 

 
    
   Gross Unrealized    
  
 
   Amortized
Cost		    
  
(at December 31, 2015, in millions)
  Gains   Losses   Fair Value  

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

   $ 2,202   $ 8   $ 16   $ 2,194  

Obligations of states, municipalities and political subdivisions:

                          

Local general obligation

     12,744     577     3     13,318  

Revenue

     9,492     472     4     9,960  

State general obligation

     1,978     97     2     2,073  

Pre-refunded

     5,813     247     —     6,060  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total obligations of states, municipalities and political subdivisions

     30,027     1,393     9     31,411  

Debt securities issued by foreign governments

     1,829     45     1     1,873  

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

     1,863     124     6     1,981  

All other corporate bonds

     22,854     523     288     23,089  

Redeemable preferred stock

     103     7     —     110  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 58,878   $ 2,100   $ 320   $ 60,658  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

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

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:

                          

Local general obligation

     12,366     644     5     13,005  

Revenue

     9,833     575     4     10,404  

State general obligation

     2,467     137     1     2,603  

Pre-refunded

     7,229     332     —     7,561  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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

 

 

(at December 31, 2015, in millions)
  Amortized
Cost		   Fair
Value		  

Due in one year or less

   $ 6,240   $ 6,324  

Due after 1 year through 5 years

     16,741     17,296  

Due after 5 years through 10 years

     16,008     16,260  

Due after 10 years

     18,026     18,797  
​ ​ ​ ​ ​ ​ ​ ​

 

     57,015     58,677  

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

     1,863     1,981  
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 58,878   $ 60,658  
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
Cost and fair value of investments in equity securities [Table Text Block]

 

 

 
    
   Gross
Unrealized		    
  
 
    
   Fair
Value		  
(at December 31, 2015, in millions)
  Cost   Gains   Losses  

Public common stock

   $ 386   $ 164   $ 7   $ 543  

Non-redeemable preferred stock

     142     26     6     162  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 528   $ 190   $ 13   $ 705  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


 

 
    
   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  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Unrealized investment losses [Table Text Block]

 

 

 
   Less than 12 months   12 months or longer   Total  
(at December 31, 2015, 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

   $ 1,820   $ 15   $ 28   $ 1   $ 1,848   $ 16  

Obligations of states, municipalities and political subdivisions

     928     7     142     2     1,070     9  

Debt securities issued by foreign governments

     172     1     —     —     172     1  

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

     473     4     57     2     530     6  

All other corporate bonds

     7,725     197     710     91     8,435     288  

Redeemable preferred stock

     8     —     —     —     8     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

     11,126     224     937     96     12,063     320  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Equity securities

                                      

Public common stock

     48     6     33     1     81     7  

Non-redeemable preferred stock

     47     3     38     3     85     6  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total equity securities

     95     9     71     4     166     13  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 11,221   $ 233   $ 1,008   $ 100   $ 12,229   $ 333  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


 

 
   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  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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

     51     17     6     7     81  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

     51     17     6     7     81  

Equity securities

     3     1     —     —     4  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 54   $ 18   $ 6   $ 7   $ 85  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Impairment charges included in net realized investment gains [Table Text Block]

 

 

(for the year ended December 31, in millions)
  2015   2014   2013  

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  

All other corporate bonds

     13     15     3  

Redeemable preferred stock

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

Total fixed maturities

     13     16     5  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Equity securities

    
 		    
 		    
 		  

Public common stock

     37     9     5  

Non-redeemable preferred stock

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

Total equity securities

     37     9     5  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other investments

     2     1     5  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 52   $ 26   $ 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, 2015
(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

   $ 40   $ —   $ —   $ (6 ) $ (2 ) $ 32  

All other corporate bonds

     59     2     —     (4 )   (6 )   51  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

   $ 99   $ 2   $ —   $ (10 ) $ (8 ) $ 83  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


 

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  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Net investment income [Table Text Block]

 

 

(for the year ended December 31, in millions)
  2015   2014   2013  

Gross investment income

                    

Fixed maturities

   $ 2,091   $ 2,244   $ 2,310  

Equity securities

     39     40     31  

Short-term securities

     12     9     11  

Real estate investments

     48     44     37  

Other investments

     230     489     364  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Gross investment income

     2,420     2,826     2,753  

Investment expenses

     41     39     37  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net investment income

   $ 2,379   $ 2,787   $ 2,716  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Changes in net unrealized investment gains [Table Text Block]

 

 

(at and for the year ended December 31, in millions)
  2015   2014   2013  

Changes in net unrealized investment gains

                    

Fixed maturities

   $ (893 ) $ 913   $ (2,804 )

Equity securities

     (143 )   63     74  

Other investments

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

Change in net pretax unrealized gains on investment securities

     (1,034 )   978     (2,731 )

Related tax expense (benefit)

     (357 )   334     (950 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Change in net unrealized gains on investment securities

     (677 )   644     (1,781 )

Balance, beginning of year

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

Balance, end of year

   $ 1,289   $ 1,966   $ 1,322  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​