Employee Benefit Obligations - Other Post-Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Employee Benefit Obligations
(Income) expense for net periodic benefit cost	$ 14
Other post retirement benefits
Employee Benefit Obligations
Benefit obligation	88	$ 99
Current portion	9	11
(Income) expense for net periodic benefit cost	$ 5	$ 6	$ 4