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Pensions and Other Postretirement Benefits (Additional Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020
Pension |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Net periodic benefit cost | $ 9 | $ 13 | $ 29 | $ 38 |
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Net periodic benefit cost | (3) | (3) | (10) | (11) |
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 | $ 2 | $ 2 | $ 7 | $ 8 |
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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