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10. INTANGIBLE ASSETS (Details 3)
 12 Months Ended
Dec. 31, 2017
Metal packaging  
Disclosure of detailed information about intangible assets [line items]  
Measurement of recoverable value Discounted Cash Flow
Cash flow projection Until 2028
Gross Margin Gross margin updated based on historical data, impacts of business restructuring and market trends.
Cost Actualization Cost based on historical data of each product and impacts of business restructuring.
Growth rate

Without growth in real terms, only updated by long term inflation of 4.0% .
Discount rate These cash flows were considered using a discount rate after taxes between 7% and 13% in real terms. The discount rate was based on the weighted average cost of capital ("WACC") that reflects the specific risk of each segment.
Long steel  
Disclosure of detailed information about intangible assets [line items]  
Measurement of recoverable value Discounted Cash Flow [1]
Cash flow projection Until 2028 [1]
Gross Margin Gross margin updated based on historical data and market trends. [1]
Cost Actualization Costs based on historical data and market trends. [1]
Growth rate Without growth in real terms, only updated by long term inflation of 2.0% , Euro zone. [1]
Discount rate These cash flows were considered using a discount rate after taxes between 7% and 13% in real terms. The discount rate was based on the weighted average cost of capital ("WACC") that reflects the specific risk of each segment. [1]
Mining  
Disclosure of detailed information about intangible assets [line items]  
Measurement of recoverable value Discounted Cash Flow
Cash flow projection Until 2056
Gross Margin Average of the gross margin of each Cash generating units based on the history and projections to the next 39 years and long-term price and exchange rate curves from industry reports.
Cost Actualization Costs based on historical data, mix of products and market trends.
Growth rate The growth rate was not considered.
Discount rate These cash flows were considered using a discount rate after taxes between 7% and 13% in real terms. The discount rate was based on the weighted average cost of capital ("WACC") that reflects the specific risk of each segment.
[1] Refer to assets of subsidiary SWT, located in Germany. The discount rate was applied on the discounted cash flow prepared in Euros, the functional currency of this subsidiary.