Quarterly report [Sections 13 or 15(d)]

REVENUES - Revenues By Product Line (Details)

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REVENUES - Revenues By Product Line (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
Steelmaking | Hot-rolled steel    
Disaggregation of Revenue [Line Items]    
Revenues 1,410 1,166
Steelmaking | Cold-rolled steel    
Disaggregation of Revenue [Line Items]    
Revenues 637 591
Steelmaking | Coated steel    
Disaggregation of Revenue [Line Items]    
Revenues 1,431 1,361
Steelmaking | Stainless and electrical steel    
Disaggregation of Revenue [Line Items]    
Revenues 465 444
Steelmaking | Plate steel    
Disaggregation of Revenue [Line Items]    
Revenues 254 247
Steelmaking | Other steel products    
Disaggregation of Revenue [Line Items]    
Revenues 108 247
Steelmaking | Other    
Disaggregation of Revenue [Line Items]    
Revenues 452 411
Other Businesses    
Disaggregation of Revenue [Line Items]    
Revenues 167 162
Other Businesses | Third Party    
Disaggregation of Revenue [Line Items]    
Revenues 165 162
Other Businesses | Other    
Disaggregation of Revenue [Line Items]    
Revenues   $ 162
Other Businesses | Other | Third Party    
Disaggregation of Revenue [Line Items]    
Revenues $ 165