Goodwill and Other Intangible Assets - Schedule of Change in Net Carrying Amount of Goodwill by Segment (Detail) $ in Millions	3 Months Ended
	Apr. 05, 2025 USD ($)
Goodwill [Line Items]
Balance, beginning of period	$ 4,288
Translation	(1)
Balance, end of period	4,287
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	(1)
Balance, end of period	2,815
Raw Materials [Member]
Goodwill [Line Items]
Balance, beginning of period	797
Balance, end of period	$ 797