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Annual report pursuant to Section 13 and 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)

v3.22.0.1
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
employee
segment
Nov. 18, 2021
segment
Dec. 31, 2020
USD ($)
Dec. 09, 2020
Dec. 31, 2019
Basis of Presentation and Significant Accounting Policies [Line Items] Ìý Ìý Ìý Ìý Ìý
Number of employees | employee 26,000 Ìý Ìý Ìý Ìý
Number of operating segments 4 Ìý Ìý Ìý Ìý
Number of reportable segments 1 Ìý Ìý Ìý Ìý
Other Noncurrent Assets Ìý Ìý Ìý Ìý Ìý
Basis of Presentation and Significant Accounting Policies [Line Items] Ìý Ìý Ìý Ìý Ìý
Investment in affiliates | $ $ 128 Ìý $ 105 Ìý Ìý
Ferrous Processing and Trading Ìý Ìý Ìý Ìý Ìý
Basis of Presentation and Significant Accounting Policies [Line Items] Ìý Ìý Ìý Ìý Ìý
Number of facilities acquired Ìý 22 Ìý Ìý Ìý
Hibbing Ìý Ìý Ìý Ìý Ìý
Basis of Presentation and Significant Accounting Policies [Line Items] Ìý Ìý Ìý Ìý Ìý
Ownership interest, equity method investment 85.30% Ìý 85.30% 62.30% 23.00%
Workforce represented by labor unions Ìý Ìý Ìý Ìý Ìý
Basis of Presentation and Significant Accounting Policies [Line Items] Ìý Ìý Ìý Ìý Ìý
Number of employees | employee 18,500 Ìý Ìý Ìý Ìý