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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 4 $ 6 $ 7
Interest cost 8 16 15
Expected return on plan assets 0 0 0
Amortization:      
Actuarial loss 0 1 0
Prior service cost (credit) (28) (16) 0
Special termination benefit 0 0 0
Curtailment (gain) / loss (3) 0 0
Settlement loss 0 0 0
Net periodic benefit cost (19) 7 22
United States Pension Benefits | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 3 2 2
Interest cost 94 123 118
Expected return on plan assets (165) (177) (170)
Amortization:      
Actuarial loss 62 47 53
Prior service cost (credit) 0 (2) (3)
Special termination benefit 0 0 0
Curtailment (gain) / loss 0 0 0
Settlement loss 39 9 0
Net periodic benefit cost 33 2 0
Foreign Pension Benefits | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 6 6 5
Interest cost 17 23 23
Expected return on plan assets (30) (29) (32)
Amortization:      
Actuarial loss 12 8 9
Prior service cost (credit) 0 0 0
Special termination benefit 0 0 0
Curtailment (gain) / loss 0 0 (4)
Settlement loss 11 2 3
Net periodic benefit cost 16 10 4
Operating Income (Loss) | Other Postretirement Benefits      
Amortization:      
Net periodic benefit cost 4 6 7
Operating Income (Loss) | United States Pension Benefits | Pension Benefits      
Amortization:      
Net periodic benefit cost 3 2 2
Operating Income (Loss) | Foreign Pension Benefits | Pension Benefits      
Amortization:      
Net periodic benefit cost 6 6 5
Nonoperating Income (Expense) | Other Postretirement Benefits      
Amortization:      
Net periodic benefit cost (23) 1 15
Nonoperating Income (Expense) | United States Pension Benefits | Pension Benefits      
Amortization:      
Net periodic benefit cost 30 0 (2)
Nonoperating Income (Expense) | Foreign Pension Benefits | Pension Benefits      
Amortization:      
Net periodic benefit cost $ 10 $ 4 $ (1)