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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, 2018
Dec. 31, 2017
Scenario I [member]    
Summary of risks and financial instruments [line items]    
Income statement effect R$ 28.3 R$ (2.6)
Equity effect (200.9) (140.4)
Total (172.6) (143.0)
Income statement effect (28.3) 2.6
Equity effect 200.9 140.4
Total 172.6 143.0
Scenario II [member]    
Summary of risks and financial instruments [line items]    
Income statement effect 70.7 (6.5)
Equity effect (502.2) (351.1)
Total (431.5) (357.6)
Income statement effect (70.7) 6.5
Equity effect 502.2 351.1
Total 431.5 357.6
Scenario III [member]    
Summary of risks and financial instruments [line items]    
Income statement effect 141.4 (13.0)
Equity effect (1,004.4) (702.2)
Total (863.0) (715.2)
Income statement effect (141.4) 13.0
Equity effect 1,004.4 702.2
Total R$ 863.0 R$ 715.2