Restructuring Costs - Restructuring and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restructuring Charges [Abstract]
Gain (loss) on divestiture			$ (586)
(Gains) losses reclassified to earnings			494
Restructuring and Related Cost
Restructuring costs	$ 46	$ 49	688	$ 90
Employee separations | Other Operating Income (Expense)
Restructuring and Related Cost
Restructuring costs	10	39	32	62
Longwall Divestiture | Other Operating Income (Expense)
Restructuring and Related Cost
Restructuring costs	0	0	586	0
Contract terminations | Other Operating Income (Expense)
Restructuring and Related Cost
Restructuring costs	0	1	0	1
Long-lived asset impairments | Other Operating Income (Expense)
Restructuring and Related Cost
Restructuring costs	2	(4)	4	1
Other | Cost of Sales
Restructuring and Related Cost
Restructuring costs	$ 34	$ 13	$ 66	$ 26