Restructuring Costs - Restructuring and Related Costs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Restructuring Charges [Abstract]
Gain (loss) on divestiture			$ (586)
(Gains) losses reclassified to earnings			494
Restructuring and Related Cost
Restructuring costs	$ 31	$ 28	642	$ 41
Employee separations | Other Operating Income (Expense)
Restructuring and Related Cost
Restructuring costs	10	18	22	23
Longwall Divestiture | Other Operating Income (Expense)
Restructuring and Related Cost
Restructuring costs	0	0	586	0
Long-lived asset impairments | Other Operating Income (Expense)
Restructuring and Related Cost
Restructuring costs	2	5	2	5
Other | Cost of Sales
Restructuring and Related Cost
Restructuring costs	$ 19	$ 5	$ 32	$ 13