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Segments - Schedule of Net Sale by Product to External Customers (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 04, 2025
Sep. 28, 2024
Oct. 04, 2025
Sep. 28, 2024
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 8,521 $ 7,444 $ 24,807 $ 23,658
Sheet [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,388 2,196 7,073 7,303
Bar [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,457 1,264 4,346 3,960
Structural [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 658 535 1,996 1,705
Plate [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 649 464 1,897 1,519
Tubular Products [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 333 291 1,077 1,005
Rebar Fabrication Products [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 567 487 1,462 1,362
Joist and Deck [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 620 517 1,682 1,714
Building Systems [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 331 342 946 1,016
Other Steel Products [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 940 859 2,686 2,618
Raw Materials [Member]        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 578 $ 489 $ 1,642 $ 1,456