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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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