Quarterly report pursuant to Section 13 or 15(d)

SEGMENT REPORTING - Results by Segment (Details)

v3.21.1
SEGMENT REPORTING - Results by Segment (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
segments
Mar. 31, 2020
USD ($)
Segment Reporting Information [Line Items]    
Number of Operating Segments | segments 4  
Number of Reportable Segments | segments 1  
Revenues $ 4,049 $ 359
Adjusted EBITDA 513 23
Steelmaking    
Segment Reporting Information [Line Items]    
Revenues 3,919 337
Adjusted EBITDA 537 44
Other Businesses    
Segment Reporting Information [Line Items]    
Revenues 130 22
Adjusted EBITDA 11 2
Corporate and eliminations    
Segment Reporting Information [Line Items]    
Adjusted EBITDA $ (35) $ (23)