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STATEMENTS OF UNAUDITED CONDENSED CONSOLIDATED COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 165 $ (234) $ (198) $ (1,193)
Other comprehensive income (loss):        
Changes in pension and OPEB, net of tax (23) (26) (70) (78)
Changes in derivative instruments, net of tax (58) (19) (123) 37
Changes in foreign currency translation (4) (36) (48) 67
Total other comprehensive income (loss) (85) (81) (241) 26
Comprehensive income (loss) 80 (315) (439) (1,167)
Comprehensive income attributable to noncontrolling interests (13) (17) (32) (42)
Comprehensive income (loss) attributable to Cliffs shareholders $ 67 $ (332) $ (471) $ (1,209)