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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)

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