Quarterly report pursuant to Section 13 or 15(d)

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

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Jun. 30, 2017
Dec. 31, 2016
Hibbing [Member] | Arcelor Mittal [Member]    
Related Party Transaction [Line Items]    
Ownership interest, equity method investment 62.30%  
Hibbing [Member] | U. S. Steel Canada [Member]    
Related Party Transaction [Line Items]    
Ownership interest, equity method investment 14.70%  
Empire [Member]    
Related Party Transaction [Line Items]    
Noncontrolling Interest, Ownership Percentage by Parent 79.00%  
Empire [Member] | Arcelor Mittal [Member]    
Related Party Transaction [Line Items]    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 21.00%  
Empire [Member] | U. S. Steel Canada [Member]    
Related Party Transaction [Line Items]    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 0.00%  
Tilden [Member]    
Related Party Transaction [Line Items]    
Noncontrolling Interest, Ownership Percentage by Parent 85.00%  
Tilden [Member] | Arcelor Mittal [Member]    
Related Party Transaction [Line Items]    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 0.00%  
Tilden [Member] | U. S. Steel Canada [Member]    
Related Party Transaction [Line Items]    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 15.00%  
Other Noncurrent Assets [Member] | Hibbing [Member]    
Related Party Transaction [Line Items]    
Ownership interest, equity method investment 23.00% 23.00%