ÐÇ¿Õ´«Ã½

Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS - Narrative (Details)

v3.20.4
ACQUISITIONS - Narrative (Details)
$ in Millions
10 Months Ended 12 Months Ended
Dec. 09, 2020
USD ($)
Mar. 13, 2020
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Revenues Ìý Ìý Ìý $ 5,354 $ 1,990 $ 2,332
Net income (loss) attributable to Cliffs shareholders Ìý Ìý Ìý (122) 293 1,128
Amortization of Inventory Step-up Ìý Ìý Ìý 96 0 0
Severance Costs Ìý Ìý Ìý 38 2 0
Business Combination, Acquisition Related Costs Ìý Ìý Ìý 90 $ 7 $ 0
ArcelorMittal USA [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Revenues $ 446 Ìý Ìý Ìý Ìý Ìý
Net income (loss) attributable to Cliffs shareholders (40) Ìý Ìý Ìý Ìý Ìý
Amortization of Inventory Step-up $ 21 Ìý Ìý Ìý Ìý Ìý
Business Combination, Acquisition Related Costs Ìý Ìý Ìý 26 Ìý Ìý
AK Steel [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Revenues Ìý Ìý $ 3,573 Ìý Ìý Ìý
Net income (loss) attributable to Cliffs shareholders Ìý Ìý (302) Ìý Ìý Ìý
Amortization of Inventory Step-up Ìý Ìý 74 Ìý Ìý Ìý
Severance Costs Ìý Ìý $ 35 Ìý Ìý Ìý
Business Combination, Acquisition Related Costs Ìý Ìý Ìý $ 26 Ìý Ìý
Business Acquisition, Shares Exchange Ratio Ìý 0.400 Ìý Ìý Ìý Ìý
AK Steel [Member] | Common Stock [Member] Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition, Shares Exchange Ratio Ìý Ìý Ìý 0.400 Ìý Ìý