Quarterly report [Sections 13 or 15(d)]

REVENUES - Revenues By Product Line (Details)

v3.25.3
REVENUES - Revenues By Product Line (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Revenues $ 4,734 $ 4,569 $ 14,297 $ 14,860
Steelmaking [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 4,585 4,439 13,888 14,429
Steelmaking [Member] | Third Party        
Disaggregation of Revenue [Line Items]        
Revenues 4,561 4,419 13,799 14,361
Steelmaking [Member] | Hot-rolled steel        
Disaggregation of Revenue [Line Items]        
Revenues 1,122 1,003 3,620 3,246
Steelmaking [Member] | Cold-rolled steel        
Disaggregation of Revenue [Line Items]        
Revenues 636 671 1,872 2,131
Steelmaking [Member] | Coated steel        
Disaggregation of Revenue [Line Items]        
Revenues 1,442 1,377 4,195 4,546
Steelmaking [Member] | Stainless and electrical steel        
Disaggregation of Revenue [Line Items]        
Revenues 466 449 1,344 1,390
Steelmaking [Member] | Plate steel        
Disaggregation of Revenue [Line Items]        
Revenues 286 237 808 887
Steelmaking [Member] | Other steel products        
Disaggregation of Revenue [Line Items]        
Revenues 204 276 727 929
Steelmaking [Member] | Other        
Disaggregation of Revenue [Line Items]        
Revenues 405 406 1,233 1,232
Other Businesses [Member]        
Disaggregation of Revenue [Line Items]        
Revenues 173 150 498 499
Other Businesses [Member] | Other        
Disaggregation of Revenue [Line Items]        
Revenues $ 173 $ 150 $ 498 $ 499