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Pension Plans, Retirement Benefits and Savings Plans (tables)
 12 Months Ended
Dec. 31, 2015
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)
  2015   2014   2015   2014   2015   2014  

Change in projected benefit obligation:

                                      

Benefit obligation at beginning of year

   $ 3,385   $ 2,908   $ 227   $ 209   $ 3,612   $ 3,117  

Benefits earned

     124     104     7     6     131     110  

Interest cost on benefit obligation

     135     140     9     10     144     150  

Actuarial loss (gain)

     (203 )   428     2     29     (201 )   457  

Benefits paid

     (191 )   (187 )   (8 )   (11 )   (199 )   (198 )

Plan amendments

     —     (8 )   —     —     —     (8 )

Curtailment

     —     —     —     (3 )   —     (3 )

Settlement

     —     —     —     (6 )   —     (6 )

Foreign currency exchange rate change

     —     —     (9 )   (7 )   (9 )   (7 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Benefit obligation at end of year          

   $ 3,250   $ 3,385   $ 228   $ 227   $ 3,478   $ 3,612  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Change in plan assets:

                                      

Fair value of plan assets at beginning of year

   $ 3,235   $ 3,074   $ 122   $ 129   $ 3,357   $ 3,203  

Actual return on plan assets

     (17 )   148     3     11     (14 )   159  

Company contributions

     100     200     7     7     107     207  

Benefits paid

     (191 )   (187 )   (8 )   (11 )   (199 )   (198 )

Foreign currency exchange rate change

     —     —     (9 )   (8 )   (9 )   (8 )

Settlement

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

Fair value of plan assets at end of year

     3,127     3,235     115     122     3,242     3,357  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Funded status of plan at end of year

   $ (123 ) $ (150 ) $ (113 ) $ (105 ) $ (236 ) $ (255 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Amounts recognized in the consolidated balance sheet consist of:

                                      

Accrued over-funded benefit plan assets

   $ —   $ —   $ 4   $ 6   $ 4   $ 6  

Accrued under-funded benefit plan liabilities

     (123 )   (150 )   (117 )   (111 )   (240 )   (261 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ (123 ) $ (150 ) $ (113 ) $ (105 ) $ (236 ) $ (255 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Amounts recognized in accumulated other comprehensive income consist of:

                                      

Net actuarial loss

   $ 1,079   $ 1,132   $ 52   $ 53   $ 1,131   $ 1,185  

Prior service benefit

     (8 )   (8 )   —     —     (8 )   (8 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 1,071   $ 1,124   $ 52   $ 53   $ 1,123   $ 1,177  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


 

 
   Postretirement
Benefit Plans		  
(at and for the year ended December 31, in millions)
  2015   2014  

Change in projected benefit obligation:

              

Benefit obligation at beginning of year

   $ 255   $ 211  

Benefits earned

     —     —  

Interest cost on benefit obligation

     10     10  

Actuarial loss (gain)

     (3 )   51  

Benefits paid

     (13 )   (15 )

Plan amendments

     (11 )   —  

Foreign currency exchange rate change

     (5 )   (2 )
​ ​ ​ ​ ​ ​ ​ ​

Benefit obligation at end of year

   $ 233   $ 255  
​ ​ ​ ​ ​ ​ ​ ​

Change in plan assets:

              

Fair value of plan assets at beginning of year

   $ 16   $ 17  

Actual return on plan assets

     —     —  

Company contributions

     12     14  

Benefits paid

     (13 )   (15 )
​ ​ ​ ​ ​ ​ ​ ​

Fair value of plan assets at end of year

     15     16  
​ ​ ​ ​ ​ ​ ​ ​

Funded status of plan at end of year

   $ (218 ) $ (239 )
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​

Amounts recognized in the consolidated balance sheet consist of:

              

Accrued under-funded benefit plan liability

   $ (218 ) $ (239 )
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​

Amounts recognized in accumulated other comprehensive income consist of:

              

Net actuarial loss

   $ 4   $ 9  

Prior service benefit

     (35 )   (26 )
​ ​ ​ ​ ​ ​ ​ ​

Total

   $ (31 ) $ (17 )
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
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)
  2015   2014   2013   2015   2014   2013  

Net Periodic Benefit Cost:

                                      

Service cost

   $ 131   $ 110   $ 118   $ —   $ —   $ —  

Interest cost on benefit obligation

     144     150     132     10     10     9  

Expected return on plan assets

     (230 )   (218 )   (208 )   —     —     (1 )

Curtailment

     —     (1 )   —     —     —     —  

Settlement

     —     2     —     —     —     —  

Amortization of unrecognized:

                                      

Prior service benefit

     (1 )   —     —     (3 )   (2 )   (2 )

Net actuarial loss (gain)

     96     65     107     1     (3 )   —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net periodic benefit cost

   $ 140   $ 108   $ 149   $ 8   $ 5   $ 6  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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

                                      

Prior service benefit

   $ —   $ (8 ) $ —   $ (11 ) $ —   $ —  

Net actuarial loss (gain)

     43     516     (518 )   (3 )   50     (24 )

Plan amendments

     —     —     —     —     —     —  

Curtailment

     —     (2 )   —     —     —     —  

Settlement

     —     (2 )   —     —     —     —  

Amortization of prior service benefit

     1     —     —     3     2     2  

Amortization of net actuarial gain (loss)

     (96 )   (65 )   (107 )   (1 )   3     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total other changes recognized in other comprehensive income

     (52 )   439     (625 )   (12 )   55     (22 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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

   $ 88   $ 547   $ (476 ) $ (4 ) $ 60   $ (16 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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,)
  2015   2014  

Assumptions used to determine benefit obligations

              

Discount rate:

              

Qualified domestic pension plan

     4.50 %   4.10 %

Nonqualified domestic pension plan

     4.37 %   4.10 %

Domestic postretirement benefit plan

     4.35 %   4.10 %

Future compensation increase rate

     4.00 %   4.00 %

Assumptions used to determine net periodic benefit cost

    
 		    
 		  

Discount rate

     4.10 %   4.96 %

Expected long-term rate of return on assets:

              

Pension plan

     7.25 %   7.50 %

Postretirement benefit plan

     4.00 %   4.00 %

Assumed health care cost trend rates

    
 		    
 		  

Following year:

              

Medical (before age 65)

     6.75 %   7.00 %

Medical (age 65 and older)

     7.50 %   6.50 %

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

    
5.00
%		  
5.00
%

Year that the rate reaches the ultimate trend rate:

    
 		    
 		  

Medical (before age 65)

     2022     2022  

Medical (age 65 and older)

     2025     2020  
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, 2015, in millions)
  Total   Level 1   Level 2   Level 3  

Invested assets:

                          

Fixed maturities

                          

Obligations of states, municipalities and political subdivisions

   $ 17   $ —   $ 17   $ —  

Debt securities issued by foreign governments

     16     —     16     —  

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

     16     —     16     —  

All other corporate bonds

     491     —     491     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

     540     —     540     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Mutual funds

                          

Equity mutual funds

     1,237     1,231     6     —  

Bond mutual funds

     649     646     3     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total mutual funds

     1,886     1,877     9     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Equity securities

     625     624     1     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other investments(1)

     2     —     —     2  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Cash and short-term securities

                          

U.S. Treasury securities

     25     25     —     —  

Money market mutual funds

     23     19     4     —  

Other

     141     20     121     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash and short-term securities

     189     64     125     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 3,242   $ 2,565   $ 675   $ 2  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
(1)
The fair value estimates of the two private equity funds comprising these investments are determined by an external fund manager based on recent filings, operating results, balance sheet stability, growth and other business and market sector fundamentals. Due to the significant unobservable inputs in these valuations, the total fair value estimates are disclosed in Level 3.

(at December 31, 2014, in millions)
  Total   Level 1   Level 2   Level 3  

Invested assets:

                          

Fixed maturities

                          

Obligations of states, municipalities and political subdivisions

   $ 19   $ —   $ 19   $ —  

Debt securities issued by foreign governments

     17     —     17     —  

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

     14     —     14     —  

All other corporate bonds

     474     —     474     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total fixed maturities

     524     —     524     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Mutual funds

                          

Equity mutual funds

     1,290     1,283     7     —  

Bond mutual funds

     610     607     3     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total mutual funds

     1,900     1,890     10     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Equity securities

     616     615     1     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other investments(1)

     2     —     —     2  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Cash and short-term securities

                          

Money market mutual funds

     22     18     4     —  

Other

     293     29     264     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total cash and short-term securities

     315     47     268     —  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 3,357   $ 2,552   $ 803   $ 2  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
(1)
The fair value estimates of the two private equity funds comprising these investments are determined by an external fund manager based on recent filings, operating results, balance sheet stability, growth and other business and market sector fundamentals. Due to the significant unobservable inputs in these valuations, the total fair value estimates are disclosed in Level 3.
Estimated future benefit payments [Table Text Block]

 

 

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

2016

   $ 215   $ 14  

2017

     218     14  

2018

     224     15  

2019

     231     15  

2020

     237     15  

2021 through 2025

     1,215     76