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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
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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

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