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, 2025
Mar. 31, 2024
Disaggregation of Revenue [Line Items]    
Revenues $ 4,629 $ 5,199
Steelmaking [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 4,495 5,053
Steelmaking [Member] | Third Party    
Disaggregation of Revenue [Line Items]    
Revenues 4,467 5,027
Other Businesses [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 162 172
Direct automotive | Steelmaking [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 1,297 1,617
Direct automotive | Other Businesses [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 130 140
Infrastructure and manufacturing | Steelmaking [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 1,354 1,392
Infrastructure and manufacturing | Other Businesses [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 10 10
Distributors and converters | Steelmaking [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 1,228 1,412
Distributors and converters | Other Businesses [Member]    
Disaggregation of Revenue [Line Items]    
Revenues 22 22
Steel producers | Steelmaking [Member]    
Disaggregation of Revenue [Line Items]    
Revenues $ 588 $ 606