Employee Benefit Obligations - Other Post-Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Employee Benefit Obligations
(Income) expense for net periodic benefit cost	$ 79
Other post retirement benefits
Employee Benefit Obligations
Benefit obligation	105	$ 148
Current portion	11	12
(Income) expense for net periodic benefit cost	$ 4	$ 1	$ 3