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FINANCIAL RISK MANAGEMENT (Details) - Schedule of level of hedge
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Schedule of level of hedge [Abstract]                    
Percentage of coverage over the expected volume of consumption 2.60% [1] 2.60% [1] 2.80% [1] 3.00% [1] 19.00% [2] 20.00% [2] 61.00% [2] 65.00% [2] 2.70% [1] 41.00% [2]
[1] The percentage shown in the table considers all the hedging instruments (swaps and options).
[2] The volume shown in the table considers all the hedging instruments (swaps and options).