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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, 2022 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	54,514
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	15,085
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	14,789
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	14,784
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	4,928
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	4,928