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Provisions - Summary of Changes in Greenhouse Gas Emissions Rights (Detail)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
KRW (₩)
kT
Dec. 31, 2020
KRW (₩)
kT
2nd planned period [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning | kT 17,905 17,276
Purchase (sell) | kT   723
Government submission | kT   0
Borrowing (carryforward) | kT   (94)
Quantity Ending | kT   17,905
Balance Beginning | ₩ ₩ 357,355 ₩ 18,306
Purchase (sell) | ₩   270,338
Government submission | ₩   0
Borrowing (carryforward) | ₩   68,711
Balance Ending | ₩   ₩ 357,355
2nd planned period [Member] | Period 2020 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning | kT 17,905  
Purchase (sell) | kT 433  
Government submission | kT (17,560)  
Borrowing (carryforward) | kT (539)  
Others | kT (239)  
Quantity Ending | kT 0 17,905
Balance Beginning | ₩ ₩ 357,355  
Purchase (sell) | ₩ 95,375  
Government submission | ₩ (280,924)  
Borrowing (carryforward) | ₩ (113,014)  
Others | ₩ (58,792)  
Balance Ending | ₩ ₩ 0 ₩ 357,355
3rd planned period [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning | kT 58,137  
Purchase (sell) | kT 1,227  
Government submission | kT 0  
Borrowing (carryforward) | kT 639  
Others | kT 0  
Quantity Ending | kT 60,003 58,137
Balance Beginning | ₩ ₩ 38,338  
Purchase (sell) | ₩ 429,747  
Government submission | ₩ 0  
Borrowing (carryforward) | ₩ 134,710  
Others | ₩ 0  
Balance Ending | ₩ ₩ 602,795 ₩ 38,338
3rd planned period [Member] | Period 2021 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning | kT 16,051  
Purchase (sell) | kT 1,426  
Government submission | kT 0  
Borrowing (carryforward) | kT 352  
Others | kT 0  
Quantity Ending | kT 17,829 16,051
Balance Beginning | ₩ ₩ 38,338  
Purchase (sell) | ₩ 410,099  
Government submission | ₩ 0  
Borrowing (carryforward) | ₩ 76,221  
Others | ₩ 0  
Balance Ending | ₩ ₩ 524,658 ₩ 38,338
3rd planned period [Member] | Period 2022 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning | kT 15,782  
Purchase (sell) | kT (31)  
Government submission | kT 0  
Borrowing (carryforward) | kT 277  
Others | kT 0  
Quantity Ending | kT 16,028 15,782
Balance Beginning | ₩ ₩ 0  
Purchase (sell) | ₩ 7,296  
Government submission | ₩ 0  
Borrowing (carryforward) | ₩ 55,439  
Others | ₩ 0  
Balance Ending | ₩ ₩ 62,735 ₩ 0
3rd planned period [Member] | Period 2023 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning | kT 15,782  
Purchase (sell) | kT (43)  
Government submission | kT 0  
Borrowing (carryforward) | kT 10  
Others | kT 0  
Quantity Ending | kT 15,749 15,782
Balance Beginning | ₩ ₩ 0  
Purchase (sell) | ₩ 5,479  
Government submission | ₩ 0  
Borrowing (carryforward) | ₩ 3,050  
Others | ₩ 0  
Balance Ending | ₩ ₩ 8,529 ₩ 0
3rd planned period [Member] | Period 2024 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning | kT 5,261  
Purchase (sell) | kT (75)  
Government submission | kT 0  
Borrowing (carryforward) | kT 0  
Others | kT 0  
Quantity Ending | kT 5,186 5,261
Balance Beginning | ₩ ₩ 0  
Purchase (sell) | ₩ 0  
Government submission | ₩ 0  
Borrowing (carryforward) | ₩ 0  
Others | ₩ 0  
Balance Ending | ₩ ₩ 0 ₩ 0
3rd planned period [Member] | Period 2025 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning | kT 5,261  
Purchase (sell) | kT (50)  
Government submission | kT 0  
Borrowing (carryforward) | kT 0  
Others | kT 0  
Quantity Ending | kT 5,211 5,261
Balance Beginning | ₩ ₩ 0  
Purchase (sell) | ₩ 6,873  
Government submission | ₩ 0  
Borrowing (carryforward) | ₩ 0  
Others | ₩ 0  
Balance Ending | ₩ ₩ 6,873 ₩ 0