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Benefit Plans - Pension benefit payments (Details) - Pension Plan - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
US |  |
Benefit plans |  |
Employer contributions | $ 1 | $ 1
Expected contribution in next fiscal year | 1 |
Expected future benefit payments |  |
2021 | 23 |
2022 | 24 |
2023 | 24 |
2024 | 24 |
2025 | 24 |
Years 2026 - 2030 | 126 |
Non-US |  |
Benefit plans |  |
Employer contributions | 4 | $ 7
Expected contribution in next fiscal year | 3 |
Expected future benefit payments |  |
2021 | 11 |
2022 | 12 |
2023 | 13 |
2024 | 13 |
2025 | 13 |
Years 2026 - 2030 | $ 70 |

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