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Financial Instruments Risks - Sensitivity of the Financial Margin SFM (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sensitivity Of The Financial Margin Given A Variation Of 100 Basis Points In Projected Margin [Abstract]    
Closing 0.92% 0.82%
Minimum 0.56% 0.58%
Maximum 0.92% 2.20%
Average 0.81% 1.48%