SEGMENT REPORTING - Depreciation, Depletion and Amortization and Capital Additions By Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization	$ (1,034)	$ (897)	$ (308)
Capital additions	1,033	857	483
Steelmaking
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization	(994)	(860)	(281)
Capital additions	997	787	436
Other Businesses
Segment Reporting Information [Line Items]
Depreciation, depletion and amortization	(40)	(37)	(27)
Capital additions	30	52	45
Corporate/Eliminations
Segment Reporting Information [Line Items]
Capital additions	$ 6	$ 18	$ 2