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Segment Information - Results of Segment Operations (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Earnings (loss) from investees $ 45 $ 38 $ 59 $ 25
Earnings (loss) before interest and income taxes 181 564 335 753
Flat-Rolled        
Segment Reporting Information [Line Items]        
Earnings (loss) from investees 40 29 45 13
Earnings (loss) before interest and income taxes 183 231 217 224
Mini Mill        
Segment Reporting Information [Line Items]        
Earnings (loss) from investees 0 0 0 0
Earnings (loss) before interest and income taxes 28 132 127 144
USSE        
Segment Reporting Information [Line Items]        
Earnings (loss) from investees 0 0 0 0
Earnings (loss) before interest and income taxes (10) 72 6 38
Tubular        
Segment Reporting Information [Line Items]        
Earnings (loss) from investees 5 9 14 12
Earnings (loss) before interest and income taxes 29 157 86 389
Total reportable segments        
Segment Reporting Information [Line Items]        
Earnings (loss) from investees 45 38 59 25
Earnings (loss) before interest and income taxes 230 592 436 795
Other        
Segment Reporting Information [Line Items]        
Earnings (loss) from investees 0 0 0 0
Earnings (loss) before interest and income taxes (4) (12) (6) (9)
Operating Segments        
Segment Reporting Information [Line Items]        
Sales 4,118 5,008 8,278 9,478
Earnings (loss) before interest and income taxes (45) (16) (95) (33)
Operating Segments | Flat-Rolled        
Segment Reporting Information [Line Items]        
Sales 2,623 2,956 5,014 5,526
Operating Segments | Mini Mill        
Segment Reporting Information [Line Items]        
Sales 510 619 1,088 1,172
Operating Segments | USSE        
Segment Reporting Information [Line Items]        
Sales 743 1,032 1,661 1,870
Operating Segments | Tubular        
Segment Reporting Information [Line Items]        
Sales 241 398 512 903
Operating Segments | Total reportable segments        
Segment Reporting Information [Line Items]        
Sales 4,117 5,005 8,275 9,471
Operating Segments | Other        
Segment Reporting Information [Line Items]        
Sales 1 3 3 7
Intersegment Sales | Flat-Rolled        
Segment Reporting Information [Line Items]        
Sales 64 93 126 183
Intersegment Sales | Mini Mill        
Segment Reporting Information [Line Items]        
Sales 91 169 216 239
Intersegment Sales | USSE        
Segment Reporting Information [Line Items]        
Sales 7 7 14 13
Intersegment Sales | Tubular        
Segment Reporting Information [Line Items]        
Sales 2 0 6 1
Intersegment Sales | Total reportable segments        
Segment Reporting Information [Line Items]        
Sales 164 269 362 436
Intersegment Sales | Other        
Segment Reporting Information [Line Items]        
Sales 0 0 0 0
Intersegment Sales | Reconciling Items and Eliminations        
Segment Reporting Information [Line Items]        
Sales (164) (269) (362) (436)
Reportable Legal Entities        
Segment Reporting Information [Line Items]        
Sales 4,118 5,008 8,278 9,478
Reportable Legal Entities | Flat-Rolled        
Segment Reporting Information [Line Items]        
Sales 2,687 3,049 5,140 5,709
Reportable Legal Entities | Mini Mill        
Segment Reporting Information [Line Items]        
Sales 601 788 1,304 1,411
Reportable Legal Entities | USSE        
Segment Reporting Information [Line Items]        
Sales 750 1,039 1,675 1,883
Reportable Legal Entities | Tubular        
Segment Reporting Information [Line Items]        
Sales 243 398 518 904
Reportable Legal Entities | Total reportable segments        
Segment Reporting Information [Line Items]        
Sales 4,281 5,274 8,637 9,907
Reportable Legal Entities | Other        
Segment Reporting Information [Line Items]        
Sales 1 3 3 7
Reconciling Items and Eliminations | Reconciling Items and Eliminations        
Segment Reporting Information [Line Items]        
Sales (164) (269) (362) (436)
Earnings (loss) before interest and income taxes $ (45) $ (16) $ (95) $ (33)