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Annual report pursuant to Section 13 and 15(d)

RELATED PARTIES - Narrative (Details)

v3.20.4
RELATED PARTIES - Narrative (Details) - Hibbing [Member]
Dec. 31, 2020
Dec. 09, 2020
Dec. 31, 2019
Related Party Transaction [Line Items] Ìý Ìý Ìý
Ownership interest, equity method investment 85.30% 62.30% 23.00%
ArcelorMittal USA [Member] Ìý Ìý Ìý
Related Party Transaction [Line Items] Ìý Ìý Ìý
Ownership interest, equity method investment Ìý 62.30% Ìý
U. S. Steel Canada [Member] Ìý Ìý Ìý
Related Party Transaction [Line Items] Ìý Ìý Ìý
Ownership interest, equity method investment 14.70% Ìý Ìý