Segments - Segments (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 28, 2024	Jun. 29, 2024	Mar. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jul. 01, 2023	Apr. 01, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales	$ 7,076	$ 7,444	$ 8,077	$ 8,137	$ 7,704	$ 8,776	$ 9,523	$ 8,710	$ 30,734	$ 34,714	$ 41,512
Total sales									46,961	52,346	61,633
Depreciation expense									1,094	931	827
Amortization expense									262	238	235
Cost of products sold									26,632	26,899	29,009
Other segment items									2,661	2,672	2,851
Segment earnings before income taxes and noncontrolling interests									3,862	7,410	11,789
Earnings before income taxes and noncontrolling interests									2,902	6,273	10,245
Total assets	33,940				35,340				33,940	35,340	32,479
Capital expenditures									3,288	2,215	1,952
Steel Mills [Member]
Segment Reporting Information [Line Items]
Total sales									23,043	24,905	30,049
Other segment items									51	73	90
Segment earnings before income taxes and noncontrolling interests									2,226	3,712	7,199
Steel Products [Member]
Segment Reporting Information [Line Items]
Total sales									10,638	13,215	15,607
Other segment items									398	414	301
Segment earnings before income taxes and noncontrolling interests									1,596	3,444	4,093
Raw Materials [Member]
Segment Reporting Information [Line Items]
Total sales									13,280	14,226	15,977
Other segment items									2,212	2,185	2,460
Segment earnings before income taxes and noncontrolling interests									40	254	497
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									30,734	34,714	41,512
Cost of products sold									40,438	42,264	46,993
Operating Segments [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales									18,734	20,093	24,190
Depreciation expense									728	611	529
Amortization expense									8	8	8
Cost of products sold									20,766	21,120	22,760
Total assets	16,582				15,407				16,582	15,407	14,157
Capital expenditures									2,238	1,440	1,453
Operating Segments [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales									10,085	12,759	15,060
Depreciation expense									150	131	116
Amortization expense									226	202	199
Cost of products sold									8,644	9,357	11,213
Total assets	11,235				10,915				11,235	10,915	12,087
Capital expenditures									497	367	267
Operating Segments [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales									1,915	1,862	2,262
Depreciation expense									197	174	171
Amortization expense									28	28	28
Cost of products sold									11,028	11,787	13,020
Total assets	3,656				3,547				3,656	3,547	3,383
Capital expenditures									478	353	182
Intercompany Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales									16,227	17,632	20,121
Intercompany Eliminations [Member] | Steel Mills [Member]
Segment Reporting Information [Line Items]
Net sales									4,309	4,812	5,859
Intercompany Eliminations [Member] | Steel Products [Member]
Segment Reporting Information [Line Items]
Net sales									553	456	547
Intercompany Eliminations [Member] | Raw Materials [Member]
Segment Reporting Information [Line Items]
Net sales									11,365	12,364	13,715
Corporate and Eliminations Items [Member]
Segment Reporting Information [Line Items]
Net sales									(16,227)	(17,632)	(20,121)
Earnings before income taxes and noncontrolling interests									(960)	(1,137)	(1,544)
Corporate [Member]
Segment Reporting Information [Line Items]
Depreciation expense									19	15	11
Total assets	$ 2,467				$ 5,471				2,467	5,471	2,852
Capital expenditures									$ 75	$ 55	$ 50