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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 |  |

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