RELATED PARTIES (Summary Of Other Ownership Interests) (Details)
|
Jun. 30, 2013
|
|||
---|---|---|---|---|
Empire [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 79.00% | |||
Tilden [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 85.00% | |||
Bloom Lake [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 75.00% | |||
Arcelor Mittal [Member] | Empire [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 21.00% | |||
Arcelor Mittal [Member] | Tilden [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 0.00% | |||
Arcelor Mittal [Member] | Hibbing [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 62.30% | |||
Arcelor Mittal [Member] | Bloom Lake [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 0.00% | |||
U. S. Steel Canada [Member] | Empire [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 0.00% | |||
U. S. Steel Canada [Member] | Tilden [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 15.00% | |||
U. S. Steel Canada [Member] | Hibbing [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 14.70% | |||
U. S. Steel Canada [Member] | Bloom Lake [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 0.00% | |||
WISCO [Member] | Empire [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 0.00% | |||
WISCO [Member] | Tilden [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 0.00% | |||
WISCO [Member] | Hibbing [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 0.00% | |||
WISCO [Member] | Bloom Lake [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership Interest | 25.00% | |||
Equity Method Investments [Member] | Hibbing [Member] | Hibbing [Member]
|
Ìý | |||
Related Party Transaction [Line Items] | Ìý | |||
Ownership interest, equity method investment | 23.00% | [1] | ||
|