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Risks and Financial Instruments - Sensitivity analysis of assets and liabilities in foreign currency (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Scenario I [member]    
Summary of risks and financial instruments [line items]    
Income statement effect R$ 45.2 R$ 28.3
Equity effect (194.1) (200.9)
Total (148.9) (172.6)
Income statement effect (45.2) (28.3)
Equity effect 194.1 200.9
Total 148.9 172.6
Scenario II [member]    
Summary of risks and financial instruments [line items]    
Income statement effect 113.0 70.7
Equity effect (485.3) (502.2)
Total (372.3) (431.5)
Income statement effect (113.0) (70.7)
Equity effect 485.3 502.2
Total 372.3 431.5
Scenario III [member]    
Summary of risks and financial instruments [line items]    
Income statement effect 226.0 141.4
Equity effect (970.6) (1,004.4)
Total (744.6) (863.0)
Income statement effect (226.0) (141.4)
Equity effect 970.6 1,004.4
Total R$ 744.6 R$ 863.0