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Provisions - Summary of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government (Detail) - 3rd planned period [Member]	Dec. 31, 2021 kT
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	57,711
Period 2021 [Member]
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	15,625
Period 2022 [Member]
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	15,782
Period 2023 [Member]
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	15,782
Period 2024 [Member]
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	5,261
Period 2025 [Member]
Disclosure of Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government [Line Items]
Greenhouse Gas Emissions Rights Allowances Received Free of Charge from the Government in Tons Co2 Equivalents	5,261

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- Definition

Disclosure of greenhouse gas emissions rights allowances received free of charge from the government.

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Greenhouse gas emissions rights allowances received free of charge from the government in tons co2 equivalents.

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