Quarterly report pursuant to Section 13 or 15(d)

RELATED PARTIES (Summary Of Other Ownership Interests) (Details)

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Mar. 31, 2018
Dec. 31, 2017
BetfredArcelor Mittal [Member]    
Related Party Transaction [Line Items]    
Ownership interest, equity method investment 62.30%  
U. S. Steel Canada [Member]    
Related Party Transaction [Line Items]    
Ownership interest, equity method investment 14.70%  
Other Noncurrent Assets [Member]    
Related Party Transaction [Line Items]    
Ownership interest, equity method investment 23.00% 23.00%