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Benefit Plans - Pension benefit payments (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
US
Benefit plans
Employer contributions	$ 1	$ 2
Expected contribution in next fiscal year	1
Expected future benefit payments
2020	20
2021	21
2022	21
2023	23
2024	22
Years 2025 - 2029	120
Non-US
Benefit plans
Employer contributions	7	$ 4
Expected contribution in next fiscal year	3
Expected future benefit payments
2020	12
2021	11
2022	12
2023	13
2024	12
Years 2025 - 2029	$ 71

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