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Pension and Other Postretirement Benefit Plans (Change in Benefit Obligation) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Postretirement Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year $ 356 $ 394  
Service cost 6 7 $ 7
Interest cost 16 15 16
Plan participants' contributions 0 0  
Actuarial loss (gain) 14 (16)  
Benefits paid (28) (36)  
Plan amendments (15) 4  
Transfer of liabilities 0 0  
Other adjustments 7 0  
Special termination benefit 0 0  
Settlements / curtailment (gain) 0 0  
Foreign currency exchange rates (1) (5)  
Reclassification of obligation to held for sale 0 (7)  
Benefit obligation, end of year 355 356 394
United States Pension Benefits | Pension Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 3,033 3,415  
Service cost 2 2 2
Interest cost 123 118 134
Plan participants' contributions 0 0  
Actuarial loss (gain) 279 (197)  
Benefits paid (263) (305)  
Plan amendments 0 0  
Transfer of liabilities 0 0  
Other adjustments 0 0  
Special termination benefit 0 0  
Settlements / curtailment (gain) (33) 0  
Foreign currency exchange rates 0 0  
Reclassification of obligation to held for sale 0 0  
Benefit obligation, end of year 3,141 3,033 3,415
Accumulated benefit obligation, end of year 3,128 3,022  
Foreign Pension Benefits | Pension Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 834 952  
Service cost 6 5 5
Interest cost 23 23 23
Plan participants' contributions 1 1  
Actuarial loss (gain) 85 (33)  
Benefits paid (30) (31)  
Plan amendments 6 1  
Transfer of liabilities (2) 0  
Other adjustments 11 0  
Special termination benefit 0 (5)  
Settlements / curtailment (gain) (13) (22)  
Foreign currency exchange rates 20 (53)  
Reclassification of obligation to held for sale 0 (4)  
Benefit obligation, end of year 941 834 $ 952
Accumulated benefit obligation, end of year $ 902 $ 804