Goodwill and Other Intangible Assets - Schedule of Change in Net Carrying Amount of Goodwill by Segment (Detail) $ in Millions	3 Months Ended
Apr. 04, 2026 USD ($)
Goodwill [Line Items]
Balance, beginning of period	$ 4,297
Translation and other	(2)
Balance, end of period	4,295
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	2,825
Translation and other	(2)
Balance, end of period	2,823
Raw Materials [Member]
Goodwill [Line Items]
Balance, beginning of period	797
Balance, end of period	$ 797

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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