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Pension and Other Postretirement Benefit Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 6 $ 7 $ 7
Interest cost 16 15 16
Expected return on plan assets 0 0 0
Amortization:      
Actuarial loss 1 0 0
Prior service cost (credit) (16) 0 (4)
Special termination benefit 0 0 4
Curtailment (gain) / loss 0 0 0
Settlement loss 0 0 0
Net periodic benefit cost 7 22 23
United States Pension Benefits | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 2 2 2
Interest cost 123 118 134
Expected return on plan assets (177) (170) (175)
Amortization:      
Actuarial loss 47 53 50
Prior service cost (credit) (2) (3) (3)
Special termination benefit 0 0 0
Curtailment (gain) / loss 0 0 0
Settlement loss 9 0 0
Net periodic benefit cost 2 0 8
Foreign Pension Benefits | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 6 5 5
Interest cost 23 23 23
Expected return on plan assets (29) (32) (30)
Amortization:      
Actuarial loss 8 9 6
Prior service cost (credit) 0 0 0
Special termination benefit 0 0 0
Curtailment (gain) / loss 0 (4) 0
Settlement loss 2 3 2
Net periodic benefit cost 10 4 6
Operating Income (Loss) | Other Postretirement Benefits      
Amortization:      
Net periodic benefit cost 6 7 7
Operating Income (Loss) | United States Pension Benefits | Pension Benefits      
Amortization:      
Net periodic benefit cost 2 2 2
Operating Income (Loss) | Foreign Pension Benefits | Pension Benefits      
Amortization:      
Net periodic benefit cost 6 5 5
Nonoperating Income (Expense) | Other Postretirement Benefits      
Amortization:      
Net periodic benefit cost 1 15 16
Nonoperating Income (Expense) | United States Pension Benefits | Pension Benefits      
Amortization:      
Net periodic benefit cost 0 (2) 6
Nonoperating Income (Expense) | Foreign Pension Benefits | Pension Benefits      
Amortization:      
Net periodic benefit cost $ 4 $ (1) $ 1