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Risks and Financial Instruments - Contractual undiscounted cash outflows (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2020
R$ / shares
2020 [member]  
Summary of risks and financial instruments [line items]  
TJLP rate 4.39%
2021 [member]  
Summary of risks and financial instruments [line items]  
DI rate 2.29%
Exchange rate of the Real against the U.S. dollar 4.86
IGP-M rate 4.79%
IPCA rate 3.60%
2022 [member]  
Summary of risks and financial instruments [line items]  
DI rate 3.74%
Exchange rate of the Real against the U.S. dollar 4.33
IGP-M rate 4.02%
IPCA rate 3.30%
2023 [member]  
Summary of risks and financial instruments [line items]  
DI rate 4.84%
Exchange rate of the Real against the U.S. dollar 4.17
IGP-M rate 3.25%
IPCA rate 3.00%
2024 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 4.20
2025 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 4.22
2026 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 4.24
2027 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 4.26
2028 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 4.28
2029 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 4.30