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Provisions - Summary of Changes in Greenhouse Gas Emissions Rights (Detail) ₩ in Millions | 12 Months Ended
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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.

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