Quarterly report pursuant to Section 13 or 15(d)

REVENUES - Revenues By Product Line (Details)

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REVENUES - Revenues By Product Line (Details)
T in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2021
USD ($)
T
Mar. 31, 2020
USD ($)
T
Disaggregation of Revenue [Line Items]    
Revenues $ 4,049 $ 359
Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues 3,919 337
Other Businesses    
Disaggregation of Revenue [Line Items]    
Revenues 130 22
Hot-rolled steel | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues $ 895 $ 19
Sales Volume (Net Tons) | T 1,182 31
Cold-rolled steel | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues $ 632 $ 28
Sales Volume (Net Tons) | T 748 40
Coated steel | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues $ 1,308 $ 90
Sales Volume (Net Tons) | T 1,369 99
Stainless and electrical steel | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues $ 363 $ 56
Sales Volume (Net Tons) | T 167 27
Plate steel | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues $ 244 $ 0
Sales Volume (Net Tons) | T 275 0
Other steel products | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues $ 289 $ 0
Sales Volume (Net Tons) | T 403 0
Iron products | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues $ 70 $ 142
Sales Volume (Long Tons) | T 600 1,351
Other | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues $ 118 $ 2
Other | Other Businesses    
Disaggregation of Revenue [Line Items]    
Revenues $ 130 $ 22