Quarterly report [Sections 13 or 15(d)]

REVENUES - Revenues By Market (Details)

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REVENUES - Revenues By Market (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disaggregation of Revenue [Line Items]    
Revenues $ 4,922 $ 4,629
Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues 4,797 4,495
Steelmaking | Third Party    
Disaggregation of Revenue [Line Items]    
Revenues 4,757 4,467
Other Businesses    
Disaggregation of Revenue [Line Items]    
Revenues 167 162
Other Businesses | Third Party    
Disaggregation of Revenue [Line Items]    
Revenues 165 162
Direct automotive | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues 1,368 1,297
Direct automotive | Other Businesses    
Disaggregation of Revenue [Line Items]    
Revenues 138 130
Infrastructure and manufacturing | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues 1,374 1,354
Infrastructure and manufacturing | Other Businesses    
Disaggregation of Revenue [Line Items]    
Revenues 9 10
Distributors and converters | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues 1,463 1,228
Distributors and converters | Other Businesses    
Disaggregation of Revenue [Line Items]    
Revenues 18 22
Steel producers | Steelmaking    
Disaggregation of Revenue [Line Items]    
Revenues $ 552 $ 588