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Pensions and Other Postretirement Benefits (Additional Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2020
Pension |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Net periodic benefit cost | $ 10 | $ 13 | $ 20 | $ 25 |
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Net periodic benefit cost | (3) | (4) | (7) | (8) |
Foreign Plan | Minimum [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Expected employer mandatory contributions | 5 |  | 5 |  |
Foreign Plan | Maximum [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Expected employer mandatory contributions | 10 |  | 10 |  |
Mandatory Contribution | Foreign Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Contributions to defined benefit pension plans | $ 3 | $ 3 | $ 5 | $ 6 |
Scenario, Forecast |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Net periodic benefit cost |  |  |  |  | $ 25
Scenario, Forecast | Pension |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Net periodic benefit cost |  |  |  |  | 40
Scenario, Forecast | Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Net periodic benefit cost |  |  |  |  | $ 15

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