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Goodwill and Other Intangible Assets - Schedule of Change in Net Carrying Amount of Goodwill by Segment (Detail)
$ in Millions
 9 Months Ended
Oct. 04, 2025
USD ($)
Goodwill [Line Items]  
Balance, beginning of period $ 4,288
Translation/Other 6
Balance, end of period 4,294
Steel Mills [Member]  
Goodwill [Line Items]  
Balance, beginning of period 675
Balance, end of period 675
Steel Products [Member]  
Goodwill [Line Items]  
Balance, beginning of period 2,816
Translation/Other 6
Balance, end of period 2,822
Raw Materials [Member]  
Goodwill [Line Items]  
Balance, beginning of period 797
Balance, end of period $ 797