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Pension Plans, Retirement Benefits and Savings Plans (tables)
 12 Months Ended
Dec. 31, 2017
Pension Plans, Retirement Benefits and Savings Plans disclosure  
Summary of the funded status, obligations and amounts recognized in the consolidated balance sheet for the Company's benefit plans [Table Text Block]

 
   Qualified
Domestic Pension
Plan		   Nonqualified
and Foreign
Pension Plans		   Total  
(at and for the year ended December 31,
in millions)
  2017   2016   2017   2016   2017   2016  

Change in projected benefit obligation:

                                      

Benefit obligation at beginning of year

   $ 3,367   $ 3,250   $ 225   $ 228   $ 3,592   $ 3,478  

Benefits earned

     112     111     7     7     119     118  

Interest cost on benefit obligation

     120     114     7     8     127     122  

Actuarial loss

     258     54     1     15     259     69  

Benefits paid

     (178 )   (162 )   (9 )   (15 )   (187 )   (177 )

Settlement

     —     —     (11 )   (3 )   (11 )   (3 )

Foreign currency exchange rate change

     —     —     10     (15 )   10     (15 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Benefit obligation at end of year          

   $ 3,679   $ 3,367   $ 230   $ 225   $ 3,909   $ 3,592  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Change in plan assets:

                                      

Fair value of plan assets at beginning of year

   $ 3,387   $ 3,127   $ 106   $ 115   $ 3,493   $ 3,242  

Actual return on plan assets

     448     222     11     11     459     233  

Company contributions

     300     200     7     14     307     214  

Benefits paid

     (178 )   (162 )   (9 )   (15 )   (187 )   (177 )

Settlement

     —     —     (12 )   (3 )   (12 )   (3 )

Foreign currency exchange rate change

     —     —     10     (16 )   10     (16 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Fair value of plan assets at end of year

     3,957     3,387     113     106     4,070     3,493  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Funded status of plan at end of year

   $ 278   $ 20   $ (117 ) $ (119 ) $ 161   $ (99 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Amounts recognized in the consolidated balance sheets consist of:

                                      

Accrued over-funded benefit plan assets

   $ 278   $ 20   $ 6   $ 5   $ 284   $ 25  

Accrued under-funded benefit plan liabilities

     —     —     (123 )   (124 )   (123 )   (124 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 278   $ 20   $ (117 ) $ (119 ) $ 161   $ (99 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Amounts recognized in accumulated other comprehensive income consist of:

                                      

Net actuarial loss

   $ 1,035   $ 1,072   $ 47   $ 55   $ 1,082   $ 1,127  

Prior service benefit

     (6 )   (6 )   —     —     (6 )   (6 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 1,029   $ 1,066   $ 47   $ 55   $ 1,076   $ 1,121  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


 

 
   Postretirement
Benefit Plans		  
(at and for the year ended December 31, in millions)
  2017   2016  

Change in projected benefit obligation:

              

Benefit obligation at beginning of year

   $ 214   $ 233  

Benefits earned

     —     —  

Interest cost on benefit obligation

     7     8  

Actuarial loss (gain)

     13     (17 )

Benefits paid

     (10 )   (11 )

Foreign currency exchange rate change

     1     1  
​ ​ ​ ​ ​ ​ ​ ​

Benefit obligation at end of year

   $ 225   $ 214  
​ ​ ​ ​ ​ ​ ​ ​

Change in plan assets:

              

Fair value of plan assets at beginning of year

   $ 14   $ 15  

Actual return on plan assets

     —     —  

Company contributions

     9     10  

Benefits paid

     (10 )   (11 )
​ ​ ​ ​ ​ ​ ​ ​

Fair value of plan assets at end of year

     13     14  
​ ​ ​ ​ ​ ​ ​ ​

Funded status of plan at end of year

   $ (212 ) $ (200 )
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​

Amounts recognized in the consolidated balance sheets consist of:

              

Accrued under-funded benefit plan liability

   $ (212 ) $ (200 )
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​

Amounts recognized in accumulated other comprehensive income consist of:

              

Net actuarial gain

   $ —   $ (13 )

Prior service benefit

     (28 )   (31 )
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ (28 ) $ (44 )
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
Summary of the components of net periodic benefit cost and other amounts recognized in other comprehensive income related to the benefit plans [Table Text Block]

 
   Pension Plans   Postretirement
Benefit Plans		  
(for the year ended December 31, in millions)
  2017   2016   2015   2017   2016   2015  

Net Periodic Benefit Cost:

                                      

Service cost

   $ 119   $ 118   $ 131   $ —   $ —   $ —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Non-service cost:

                                      

Interest cost on benefit obligation

     127     122     144     7     8     10  

Expected return on plan assets

     (240 )   (230 )   (230 )   —     —     —  

Settlement

     3     1     —     —     —     —  

Amortization of unrecognized:

                                      

Prior service benefit

     (1 )   (1 )   (1 )   (4 )   (3 )   (3 )

Net actuarial loss

     85     66     96     —     —     1  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total non-service cost (benefit)

     (26 )   (42 )   9     3     5     8  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net periodic benefit cost

     93     76     140     3     5     8  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other Changes in Benefit Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income:

                                      

Prior service benefit

     —     —     —     —     —     (11 )

Net actuarial loss (gain)

     40     66     43     13     (17 )   (3 )

Foreign currency exchange rate change

     2     (2 )   —     (1 )   1     —  

Settlement

     (2 )   (1 )   —     —     —     —  

Amortization of prior service benefit

     1     1     1     4     3     3  

Amortization of net actuarial loss

     (85 )   (66 )   (96 )   —     —     (1 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total other changes recognized in other comprehensive income

     (44 )   (2 )   (52 )   16     (13 )   (12 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total other changes recognized in net periodic benefit cost and other comprehensive income

   $ 49   $ 74   $ 88   $ 19   $ (8 ) $ (4 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Consolidated statement of income line items impacted by service costs and non-service benefit costs [Table Text Block]

 
   Pension Plans   Postretirement
Benefit Plans		  
(for the year ended December 31, in millions)
  2017   2016   2015   2017   2016   2015  

Service Cost:

                                      

Claims and claim adjustment expenses

   $ 48   $ 48   $ 53   $ —   $ —   $ —  

General and administrative expenses

     71     70     78     —     —     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total service cost

     119     118     131     —     —     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Non-Service Cost:

                                      

Claims and claim adjustment expenses

     (11 )   (18 )   4     1     2     3  

General and administrative expenses

     (15 )   (24 )   5     2     3     5  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total non-service cost (benefit)

     (26 )   (42 )   9     3     5     8  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net periodic benefit cost

   $ 93   $ 76   $ 140   $ 3   $ 5   $ 8  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Benefit obligations assumptions, net periodic benefit cost assumptions and health care cost trend rates [Table Text Block]

(at and for the year ended December 31,)
  2017   2016  

Assumptions used to determine benefit obligations

              

Discount rate:

              

Qualified domestic pension plan

     3.71 %   4.23 %

Nonqualified domestic pension plan

     3.66 %   4.15 %

Domestic postretirement benefit plan

     3.60 %   4.10 %

Future compensation increase rate

     4.00 %   4.00 %

Assumptions used to determine net periodic benefit cost

    
 		    
 		  

Discount rate:

              

Qualified domestic pension plan:

              

Service cost

     4.52 %   4.77 %

Interest cost

     3.55 %   3.64 %

Nonqualified domestic pension plan:

    
 		    
 		  

Service cost

     4.24 %   4.53 %

Interest cost

     3.43 %   3.47 %

Domestic postretirement benefit plan:

    
 		    
 		  

Interest cost

     3.42 %   3.53 %

Expected long-term rate of return on assets:

    
 		    
 		  

Pension plan

     7.00 %   7.00 %

Postretirement benefit plan

     4.00 %   4.00 %

Assumed health care cost trend rates

    
 		    
 		  

Following year:

              

Medical (before age 65)

     7.50 %   6.50 %

Medical (age 65 and older)

     8.75 %   7.25 %

Rate to which the cost trend rate is assumed to decline (ultimate trend rate)

    
4.50
%		  
5.00
%

Year that the rate reaches the ultimate trend rate:

    
 		    
 		  

Medical (before age 65)

     2026     2022  

Medical (age 65 and older)

     2026     2025  
Level within the fair value hierarchy at which the financial assets of the Company's pension plans are measured [Table Text Block]

(at December 31, 2017, in millions)
  Total   Level 1   Level 2   Level 3  

Invested assets:

                          

Fixed maturities

                          

Obligations of states, municipalities and political subdivisions

   $ 3   $ —   $ 3   $ —  

Debt securities issued by foreign governments

     16     —     16     —  

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

     10     —     10     —  

All other corporate bonds

     514     —     514     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

     543     —     543     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Mutual funds

                          

Equity mutual funds

     1,335     1,328     7     —  

Bond mutual funds

     822     819     3     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total mutual funds

     2,157     2,147     10     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Equity securities

     883     882     1     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other investments

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

Cash and short-term securities

                          

U.S. Treasury securities

     241     241     —     —  

Money market mutual funds

     27     27     —     —  

Other

     218     27     191     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash and short-term securities

     486     295     191     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 4,070   $ 3,324   $ 745   $ 1  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

(at December 31, 2016, in millions)
  Total   Level 1   Level 2   Level 3  

Invested assets:

                          

Fixed maturities

                          

Obligations of states, municipalities and political subdivisions

   $ 9   $ —   $ 9   $ —  

Debt securities issued by foreign governments

     14     —     14     —  

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

     12     —     12     —  

All other corporate bonds

     511     —     511     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

     546     —     546     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Mutual funds

                          

Equity mutual funds

     1,285     1,278     7     —  

Bond mutual funds

     641     638     3     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total mutual funds

     1,926     1,916     10     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Equity securities

     747     747     —     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other investments

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

Cash and short-term securities

                          

U.S. Treasury securities

     45     45     —     —  

Money market mutual funds

     20     19     1     —  

Other

     208     28     180     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash and short-term securities

     273     92     181     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 3,493   $ 2,755   $ 737   $ 1  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Estimated future benefit payments [Table Text Block]

 
   Benefits Expected to be Paid  
(in millions)
  Pension Plans   Postretirement
Benefit Plans		  

2018

   $ 230   $ 14  

2019

     241     14  

2020

     245     14  

2021

     256     15  

2022

     262     15  

2023 through 2027

     1,342     74