REVENUES - Revenues By Market (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 5,295	$ 5,955
Steelmaking
Disaggregation of Revenue [Line Items]
Revenues	5,126	5,794
Other Businesses
Disaggregation of Revenue [Line Items]
Revenues	169	161
Automotive | Steelmaking
Disaggregation of Revenue [Line Items]
Revenues	1,870	1,607
Automotive | Other Businesses
Disaggregation of Revenue [Line Items]
Revenues	139	122
Infrastructure and manufacturing | Steelmaking
Disaggregation of Revenue [Line Items]
Revenues	1,297	1,542
Infrastructure and manufacturing | Other Businesses
Disaggregation of Revenue [Line Items]
Revenues	10	15
Distributors and converters | Steelmaking
Disaggregation of Revenue [Line Items]
Revenues	1,258	1,829
Distributors and converters | Other Businesses
Disaggregation of Revenue [Line Items]
Revenues	20	24
Steel producers | Steelmaking
Disaggregation of Revenue [Line Items]
Revenues	$ 701	$ 816