v3.26.1
Segments - Segments (Detail) - USD ($)
$ in Millions
 3 Months Ended
Apr. 04, 2026
Apr. 05, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]      
Net sales $ 9,496 $ 7,830  
Total sales 14,250 11,780  
Depreciation expense 321 303  
Amortization expense 63 65  
Cost of products sold 7,995 7,225  
Other segment items 135 56  
Segment earnings before income taxes and noncontrolling interests 1,458 548  
Earnings before income taxes and noncontrolling interests 1,096 285  
Capital expenditures 654 921  
Total assets 35,635   $ 35,104
Steel Mills [Member]      
Segment Reporting Information [Line Items]      
Total sales 7,471 5,981  
Other segment items 22 7  
Segment earnings before income taxes and noncontrolling interests 1,128 231  
Steel Products [Member]      
Segment Reporting Information [Line Items]      
Total sales 3,018 2,555  
Other segment items 73 38  
Segment earnings before income taxes and noncontrolling interests 285 288  
Raw Materials [Member]      
Segment Reporting Information [Line Items]      
Total sales 3,761 3,244  
Other segment items 40 11  
Segment earnings before income taxes and noncontrolling interests 45 29  
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales 9,496 7,830  
Cost of products sold 12,657 11,176  
Operating Segments [Member] | Steel Mills [Member]      
Segment Reporting Information [Line Items]      
Net sales 6,036 4,907  
Depreciation expense 213 207  
Amortization expense 2 2  
Cost of products sold 6,321 5,743  
Capital expenditures 440 609  
Total assets 18,777   18,354
Operating Segments [Member] | Steel Products [Member]      
Segment Reporting Information [Line Items]      
Net sales 2,786 2,405  
Depreciation expense 54 40  
Amortization expense 54 56  
Cost of products sold 2,660 2,229  
Capital expenditures 130 154  
Total assets 11,940   11,770
Operating Segments [Member] | Raw Materials [Member]      
Segment Reporting Information [Line Items]      
Net sales 674 518  
Depreciation expense 48 51  
Amortization expense 7 7  
Cost of products sold 3,676 3,204  
Capital expenditures 48 118  
Total assets 4,100   4,013
Intercompany Eliminations [Member]      
Segment Reporting Information [Line Items]      
Net sales 4,754 3,950  
Intercompany Eliminations [Member] | Steel Mills [Member]      
Segment Reporting Information [Line Items]      
Net sales 1,435 1,074  
Intercompany Eliminations [Member] | Steel Products [Member]      
Segment Reporting Information [Line Items]      
Net sales 232 150  
Intercompany Eliminations [Member] | Raw Materials [Member]      
Segment Reporting Information [Line Items]      
Net sales 3,087 2,726  
Corporate and Eliminations Items [Member]      
Segment Reporting Information [Line Items]      
Net sales (4,754) (3,950)  
Earnings before income taxes and noncontrolling interests (362) (263)  
Corporate [Member]      
Segment Reporting Information [Line Items]      
Depreciation expense 6 5  
Capital expenditures 36 $ 40  
Total assets $ 818   $ 967