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Financial Instruments and Risks Management - Credit Risk Exposure (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments and Risks Management    
Financial Assets R$ 14,298,290 R$ 28,780,120
Credit risk    
Financial Instruments and Risks Management    
Financial Assets 10,409,887 25,979,952
Credit risk | Cash and cash equivalents    
Financial Instruments and Risks Management    
Financial Assets 3,249,127 4,387,453
Credit risk | Marketable securities    
Financial Instruments and Risks Management    
Financial Assets 6,330,334 21,098,565
Credit risk | Derivative financial instruments    
Financial Instruments and Risks Management    
Financial Assets R$ 830,426 R$ 493,934