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Risks and Financial Instruments - Contractual undiscounted cash outflows (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2019
2020 [member]  
Summary of risks and financial instruments [line items]  
DI rate 4.40%
Exchange rate of the Real against the U.S. dollar 405
TJLP rate 5.57%
IGP-M rate 4.18%
IPCA rate 3.46%
2021 [member]  
Summary of risks and financial instruments [line items]  
DI rate 4.95%
Exchange rate of the Real against the U.S. dollar 4.17
IGP-M rate 3.99%
IPCA rate 3.45%
2022 [member]  
Summary of risks and financial instruments [line items]  
DI rate 5.57%
Exchange rate of the Real against the U.S. dollar 4.33
IGP-M rate 3.75%
IPCA rate 3.50%
2023 [member]  
Summary of risks and financial instruments [line items]  
DI rate 6.01%
Exchange rate of the Real against the U.S. dollar 4.52
IGP-M rate 3.58%
IPCA rate 3.25%
2024 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 4.73
2025 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 4.93
2026 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 5.13
2027 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 5.34
2028 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 5.56
2029 [member]  
Summary of risks and financial instruments [line items]  
Exchange rate of the Real against the U.S. dollar 5.78