v3.26.3
SEGMENT REPORTING - EBITDA Reconciliation and Capital Additions (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Revenues $ 5,612 $ 4,734 $ 15,760 $ 14,297
Cost of Product and Service Sold (5,147) (4,780) (15,245) (14,951)
Selling, General and Administrative Expense (153) (130) (432) (400)
Net periodic benefit costs (credits) 64 57 192 157
Depreciation, depletion and amortization 259 288 780 963
Segment Reporting, Other Segment Item, Amount (23) (26) (62) (8)
Adjusted EBITDA 612 143 993 58
Interest expense, net (148) (153) (452) (442)
Income Tax Expense (Benefit) (46) 78 55 375
Depreciation, depletion and amortization (259) (288) (780) (963)
Changes in fair value of derivatives, net 15 10 37 34
Net income (loss) 165 (234) (198) (1,193)
Capital additions 208 207 523 488
Net income (loss) attributable to noncontrolling interest 13 17 32 42
Depreciation, depletion and amortization attributable to noncontrolling interests 6 6 18 19
Adj EBITDA Calculation        
Segment Reporting [Line Items]        
Depreciation, depletion and amortization 259 288 780 963
Interest expense, net (148) (153) (452) (442)
Income Tax Expense (Benefit) (46) 78 55 375
Depreciation, depletion and amortization (259) (288) (780) (963)
EBITDA of noncontrolling interests 19 23 50 61
Idled facilities employment charges (4) 3 1 (245)
Gain (Loss), Foreign Currency Transaction, before Tax (4) (20) (37) 26
Changes in fair value of derivatives, net (15) (10) (37) (34)
Amortization of inventory step-up [Abstract]       6
Other Adjustments, Net (2) (3) (11) (4)
Gain (Loss) on Disposition of Other Assets 14 (2) 23 (6)
Severance Costs (2) (5) (3) (25)
Steelmaking        
Segment Reporting [Line Items]        
Revenues 5,492 4,585 15,385 13,888
Cost of Product and Service Sold (5,036) (4,643) (14,911) (14,577)
Selling, General and Administrative Expense (145) (123) (409) (379)
Net periodic benefit costs (credits) 64 57 192 157
Depreciation, depletion and amortization 250 279 755 939
Segment Reporting, Other Segment Item, Amount (24) (26) (63) (8)
Adjusted EBITDA 601 129 949 20
Depreciation, depletion and amortization (250) (279) (755) (939)
Capital additions 207 205 518 478
Other Businesses        
Segment Reporting [Line Items]        
Revenues 169 173 513 498
Cost of Product and Service Sold (158) (163) (470) (463)
Selling, General and Administrative Expense (8) (7) (23) (21)
Net periodic benefit costs (credits) 0 0 0 0
Depreciation, depletion and amortization 9 9 25 24
Segment Reporting, Other Segment Item, Amount 1 0 1 0
Adjusted EBITDA 13 12 46 38
Depreciation, depletion and amortization (9) (9) (25) (24)
Capital additions 1 2 5 10
Eliminations        
Segment Reporting [Line Items]        
Revenues (49) (24) (138) (89)
Cost of Product and Service Sold 47 26 136 89
Selling, General and Administrative Expense 0 0 0 0
Net periodic benefit costs (credits) 0 0 0 0
Depreciation, depletion and amortization 0 0 0 0
Segment Reporting, Other Segment Item, Amount 0 0 0 0
Adjusted EBITDA (2) 2 (2) 0
Depreciation, depletion and amortization 0 0 0 0
Capital additions $ 0 $ 0 $ 0 $ 0