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Segments - Segments (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 04, 2025 | Sep. 28, 2024 | Oct. 04, 2025 | Sep. 28, 2024 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 8,521 | $ 7,444 | $ 24,807 | $ 23,658 |
Total sales | 12,831 | 10,794 | 37,376 | 34,525 |
Depreciation expense | 304 | 281 | 910 | 809 |
Amortization expense | 63 | 69 | 191 | 189 |
Cost of products sold | 7,333 | 6,686 | 21,791 | 20,183 |
Other segment items | 166 | 225 | 378 | 456 |
Segment earnings before income taxes and noncontrolling interests | 1,155 | 557 | 2,995 | 3,307 |
Earnings before income taxes and noncontrolling interests | 883 | 389 | 2,067 | 2,512 |
Capital expenditures | 848 | 856 | 2,634 | 2,364 |
Total assets | 34,776 |  | 34,776 |  | $ 33,940
Steel Mills [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total sales | 6,568 | 5,443 | 19,162 | 17,892 |
Other segment items | (2) | 15 | 48 | 48 |
Segment earnings before income taxes and noncontrolling interests | 793 | 309 | 1,867 | 2,057 |
Steel Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total sales | 2,972 | 2,620 | 8,332 | 8,133 |
Other segment items | 147 | 107 | 270 | 265 |
Segment earnings before income taxes and noncontrolling interests | 319 | 314 | 999 | 1,267 |
Raw Materials [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total sales | 3,291 | 2,731 | 9,882 | 8,500 |
Other segment items | 21 | 103 | 60 | 143 |
Segment earnings before income taxes and noncontrolling interests | 43 | (66) | 129 | (17) |
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 8,521 | 7,444 | 24,807 | 23,658 |
Cost of products sold | 11,510 | 10,012 | 34,003 | 30,762 |
Operating Segments [Member] | Steel Mills [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 5,152 | 4,460 | 15,312 | 14,486 |
Depreciation expense | 200 | 187 | 604 | 538 |
Amortization expense | 2 | 2 | 6 | 6 |
Cost of products sold | 5,777 | 5,119 | 17,247 | 15,787 |
Capital expenditures | 586 | 603 | 1,747 | 1,618 |
Total assets | 18,103 |  | 18,103 |  | 16,582
Operating Segments [Member] | Steel Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 2,791 | 2,496 | 7,853 | 7,716 |
Depreciation expense | 46 | 38 | 132 | 110 |
Amortization expense | 53 | 60 | 163 | 162 |
Cost of products sold | 2,506 | 2,199 | 7,063 | 6,601 |
Capital expenditures | 137 | 140 | 447 | 358 |
Total assets | 11,779 |  | 11,779 |  | 11,235
Operating Segments [Member] | Raw Materials [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 578 | 488 | 1,642 | 1,456 |
Depreciation expense | 53 | 51 | 158 | 147 |
Amortization expense | 8 | 7 | 22 | 21 |
Cost of products sold | 3,227 | 2,694 | 9,693 | 8,374 |
Capital expenditures | 77 | 104 | 313 | 336 |
Total assets | 3,900 |  | 3,900 |  | 3,656
Intercompany Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 4,310 | 3,350 | 12,569 | 10,867 |
Intercompany Eliminations [Member] | Steel Mills [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 1,416 | 983 | 3,850 | 3,406 |
Intercompany Eliminations [Member] | Steel Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 181 | 124 | 479 | 417 |
Intercompany Eliminations [Member] | Raw Materials [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 2,713 | 2,243 | 8,240 | 7,044 |
Corporate and Eliminations Items [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | (4,310) | (3,350) | (12,569) | (10,867) |
Earnings before income taxes and noncontrolling interests | (272) | (168) | (928) | (795) |
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation expense | 5 | 5 | 16 | 14 |
Capital expenditures | 48 | $ 9 | 127 | $ 52 |
Total assets | $ 994 |  | $ 994 |  | $ 2,467

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