Employee Benefit Obligations - Total (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Employee Benefit Obligations
Underfunded defined benefit pension liabilities	$ 503	$ 582
Less current portion	(21)	(21)
Long-term defined benefit pension liabilities	482	561
Long-term retiree medical liabilities	133	135
Deferred compensation plans	398	441
Other	34	68
Total non-current employee benefit obligations	$ 1,047	$ 1,205