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Provisions - Summary of Changes in Greenhouse Gas Emissions Rights (Detail)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
KRW (₩)
kT
Dec. 31, 2021
KRW (₩)
kT
2nd planned period [Member] | Period 2020 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning 0 17,905
Purchase (Sell)   433
Government submission   (17,560)
Borrowing (carryforward)   (539)
Others   (239)
Quantity Ending   0
Balance Beginning | ₩ ₩ 0 ₩ 357,355
Purchase (Sell) | ₩   95,375
Government submission | ₩   (280,924)
Borrowing (carryforward) | ₩   (113,014)
Others | ₩   (58,792)
Balance Ending | ₩   ₩ 0
3rd planned period [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning 60,003 58,137
Adjusted Quantity Beginning [1] 49,908  
Purchase (Sell) 2,601 1,227
Government submission (18,440) 0
Borrowing (carryforward) 334 639
Others 0 0
Quantity Ending 34,403 60,003
Balance Beginning | ₩ ₩ 602,795 [1] ₩ 38,338
Purchase (Sell) | ₩ 553,757 429,747
Government submission | ₩ (753,707) 0
Borrowing (carryforward) | ₩ 60,473 134,710
Others | ₩ (227,352) 0
Balance Ending | ₩ ₩ 235,966 ₩ 602,795 [1]
3rd planned period [Member] | Period 2021 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning 17,829 16,051
Adjusted Quantity Beginning [1] 16,433  
Purchase (Sell) 1,191 1,426
Government submission (17,602) 0
Borrowing (carryforward) (22) 352
Others 0 0
Quantity Ending 0 17,829
Balance Beginning | ₩ ₩ 524,658 [1] ₩ 38,338
Purchase (Sell) | ₩ 267,433 410,099
Government submission | ₩ (580,807) 0
Borrowing (carryforward) | ₩ (3,298) 76,221
Others | ₩ (207,986) 0
Balance Ending | ₩ ₩ 0 ₩ 524,658 [1]
3rd planned period [Member] | Period 2022 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning 16,028 15,782
Adjusted Quantity Beginning [1] 14,942  
Purchase (Sell) 1,343 (31)
Government submission (838) 0
Borrowing (carryforward) 286 277
Others 0 0
Quantity Ending 15,733 16,028
Balance Beginning | ₩ ₩ 62,735 [1] ₩ 0
Purchase (Sell) | ₩ 272,824 7,296
Government submission | ₩ (173,145) 0
Borrowing (carryforward) | ₩ 45,847 55,439
Others | ₩ (16,256) 0
Balance Ending | ₩ ₩ 192,005 ₩ 62,735 [1]
3rd planned period [Member] | Period 2023 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning 15,749 15,782
Adjusted Quantity Beginning [1] 11,166  
Purchase (Sell) 32 (43)
Government submission 0 0
Borrowing (carryforward) 48 10
Others 0 0
Quantity Ending 11,246 15,749
Balance Beginning | ₩ ₩ 8,529 [1] ₩ 0
Purchase (Sell) | ₩ 6,315 5,479
Government submission | ₩ 245 0
Borrowing (carryforward) | ₩ 12,225 3,050
Others | ₩ (8,529) 0
Balance Ending | ₩ ₩ 18,785 ₩ 8,529 [1]
3rd planned period [Member] | Period 2024 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning 5,186 5,261
Adjusted Quantity Beginning [1] 3,671  
Purchase (Sell) 35 (75)
Government submission 0 0
Borrowing (carryforward) 22 0
Others 0 0
Quantity Ending 3,728 5,186
Balance Beginning | ₩ ₩ 0 [1] ₩ 0
Purchase (Sell) | ₩ 7,185 0
Government submission | ₩ 0 0
Borrowing (carryforward) | ₩ 5,699 0
Others | ₩ 0 0
Balance Ending | ₩ ₩ 12,884 ₩ 0 [1]
3rd planned period [Member] | Period 2025 [Member]    
Disclosure of Detailed Information About Changes in Changes in Greenhouse Gas Emissions Rights [Line Items]    
Quantity Beginning 5,211 5,261
Adjusted Quantity Beginning [1] 3,696  
Purchase (Sell) 0 (50)
Government submission 0 0
Borrowing (carryforward) 0 0
Others 0 0
Quantity Ending 3,696 5,211
Balance Beginning | ₩ ₩ 6,873 [1] ₩ 0
Purchase (Sell) | ₩ 0 6,873
Government submission | ₩ 0 0
Borrowing (carryforward) | ₩ 0 0
Others | ₩ 5,419 0
Balance Ending | ₩ ₩ 12,292 ₩ 6,873 [1]
[1] Changes such as additional allowances or cancellation of allowances are reflected.