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Pension and Other Postretirement Benefit Plans (Change in Plan Assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
United States Pension Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year $ 2,741 $ 3,042
Actual return on plan assets 206 (62)
Employer contribution 14 76
Plan participants’ contributions 0 0
Benefits paid (286) (315)
Other Adjustments 0 0
Settlements (11) 0
Foreign currency exchange rates 0 0
Fair value of plan assets, end of year 2,664 2,741
Foreign Pension Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year 552 640
Actual return on plan assets 47 16
Employer contribution 30 39
Plan participants’ contributions 1 1
Benefits paid (31) (31)
Other Adjustments 0 4
Settlements (14) (73)
Foreign currency exchange rates (75) (44)
Fair value of plan assets, end of year 510 552
Other Postretirement Benefits    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year 0 0
Actual return on plan assets 0 0
Employer contribution 48 48
Plan participants’ contributions 6 7
Benefits paid (54) (55)
Other Adjustments 0 0
Settlements 0 0
Foreign currency exchange rates 0 0
Fair value of plan assets, end of year $ 0 $ 0