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Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTIES (Summary Of Ownership Interests) (Details)

v3.20.1
RELATED PARTIES (Summary Of Ownership Interests) (Details) - Hibbing [Member]
Mar. 31, 2020
Related Party Transaction [Line Items] Ìý
Equity Method Investment, Ownership Percentage 23.00%
Arcelor Mittal [Member] Ìý
Related Party Transaction [Line Items] Ìý
Equity Method Investment, Ownership Percentage 62.30%
U. S. Steel Canada [Member] Ìý
Related Party Transaction [Line Items] Ìý
Equity Method Investment, Ownership Percentage 14.70%