Quarterly report pursuant to Section 13 or 15(d)

REVENUES - Revenues By Market (Details)

v3.21.1
REVENUES - Revenues By Market (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
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
Automotive | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues 1,287 102
Automotive | Other Businesses    
Disaggregation of Revenue [Line Items]    
Revenues 105 16
Infrastructure and manufacturing | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues 954 39
Infrastructure and manufacturing | Other Businesses    
Disaggregation of Revenue [Line Items]    
Revenues 10 4
Distributors and converters | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues 1,248 52
Distributors and converters | Other Businesses    
Disaggregation of Revenue [Line Items]    
Revenues 15 2
Steel producers | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues $ 430 $ 144