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ACQUISITION OF BUSINESS - Thyssenkrupp Slab International B.V. & CSA Siderrgica do Atlantico Ltda. (Narrative) (Details) - Thyssenkrupp Slab International B.V. & CSA Siderúrgica do Atlântico Ltda.
t in Millions
 4 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
t
Sep. 07, 2017
USD ($)
Dec. 31, 2017
USD ($)
t
Dec. 31, 2017
USD ($)
MWh
t
Disclosure of detailed information about business combination [line items]        
Percentage of voting equity interests acquired   100.00%    
Annual production capacity of steel (tons) | t       5.0
Number of megawatts (per year) | MWh       490
Slabs supplied (tons per year) | t 2.0   2.0 2.0
Consideration transferred, acquisition-date fair value $ 1,891,000,000   $ 1,891,000,000 $ 1,891,000,000
Revenue of acquiree since acquisition date     864,000,000  
Net profit of acquiree since acquisition date     64,000,000  
Revenue of combined entity as if combination occurred at beginning of period       2,398,000,000
Net loss of combined entity as if combination occurred at beginning of period       6,000,000
Financial instruments designated as hedging instruments, at fair value   $ 75,900,000    
Tax benefit recognised as of acquisition date   1,089,000,000    
Acquisitions through business combinations, other provisions 620,100,000 651,800,000    
Asset recognised for expected reimbursement, contingent liabilities in business combination 310,000,000 325,900,000 310,000,000 310,000,000
Estimated financial effect, contingent liabilities in business combination   1,630,000,000    
Other environment related provision        
Disclosure of detailed information about business combination [line items]        
Other provisions 23,400,000 24,500,000 23,400,000 23,400,000
Legal proceedings contingent liability        
Disclosure of detailed information about business combination [line items]        
Other provisions $ 54,900,000 $ 57,700,000 $ 54,900,000 $ 54,900,000
Syndicated Facility        
Disclosure of detailed information about business combination [line items]        
Debt instrument, term   5 years    
Notional amount   $ 1,500,000,000.0