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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenues $ 4,934 $ 5,092 $ 9,563 $ 10,291
Steelmaking [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 4,808 4,937 9,303 9,990
Steelmaking [Member] | Third Party        
Disaggregation of Revenue [Line Items]        
Revenues 4,771 4,915 9,238 9,942
Steelmaking [Member] | Hot-rolled steel        
Disaggregation of Revenue [Line Items]        
Revenues 1,332 1,115 2,498 2,243
Steelmaking [Member] | Cold-rolled steel        
Disaggregation of Revenue [Line Items]        
Revenues 645 711 1,236 1,460
Steelmaking [Member] | Coated steel        
Disaggregation of Revenue [Line Items]        
Revenues 1,392 1,546 2,753 3,169
Steelmaking [Member] | Stainless and electrical steel        
Disaggregation of Revenue [Line Items]        
Revenues 434 480 878 941
Steelmaking [Member] | Plate steel        
Disaggregation of Revenue [Line Items]        
Revenues 275 317 522 650
Steelmaking [Member] | Other steel products        
Disaggregation of Revenue [Line Items]        
Revenues 276 318 523 653
Steelmaking [Member] | Other        
Disaggregation of Revenue [Line Items]        
Revenues 417 428 828 826
Other Businesses [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 163 177 325 349
Other Businesses [Member] | Other        
Disaggregation of Revenue [Line Items]        
Revenues $ 163 $ 177 $ 325 $ 349