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Leases - Summary of Right-of-Use Assets (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Depreciation |  | ₩ (538,995) |  | ₩ (536,517)
Right-of-use assets |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 3,363,743 |  | 3,711,125
Increase |  | 132,495 |  | 261,862
Depreciation |  | (538,995) |  | (536,517)
Decrease |  | (2,252) |  | (2,613)
Others |  | 91,405 |  | (70,114)
Ending balance |  | 3,046,396 |  | 3,363,743
Right-of-use assets | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 6,041,794 |  |
Ending balance |  | 6,031,076 |  | 6,041,794
Right-of-use assets | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (2,678,051) |  |
Ending balance |  | (2,984,680) |  | (2,678,051)
Land |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 655,860 |  | 661,799
Increase |  | 12,369 |  | 2,696
Depreciation |  | (65,245) |  | (57,461)
Decrease |  | (117) |  | (126)
Others |  | 74,735 |  | 48,952
Ending balance |  | 677,602 |  | 655,860
Land | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 937,481 |  |
Ending balance |  | 1,017,114 |  | 937,481
Land | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (281,621) |  |
Ending balance |  | (339,512) |  | (281,621)
Buildings |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 90,573 |  | 74,856
Increase |  | 61,397 |  | 24,622
Depreciation |  | (48,371) |  | (32,591)
Decrease |  | (399) |  | (904)
Others |  | 2,641 |  | 24,590
Ending balance |  | 105,841 |  | 90,573
Buildings | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 188,017 |  |
Ending balance |  | 214,258 |  | 188,017
Buildings | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (97,444) |  |
Ending balance |  | (108,417) |  | (97,444)
Structures |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 37,356 |  | 23,965
Increase |  | 4,115 |  | 49
Depreciation |  | (4,595) |  | (2,471)
Decrease |  | 0 |  | (273)
Others |  | 3,983 |  | 16,086
Ending balance |  | 40,859 |  | 37,356
Structures | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 46,573 |  |
Ending balance |  | 52,983 |  | 46,573
Structures | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (9,217) |  |
Ending balance |  | (12,124) |  | (9,217)
Machinery |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 5,943 |  | 835
Increase |  | 26,200 |  | 0
Depreciation |  | (7,083) |  | (94)
Decrease |  | 0 |  | 0
Others |  | 2,000 |  | 5,202
Ending balance |  | 27,060 |  | 5,943
Machinery | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 26,453 |  |
Ending balance |  | 54,654 |  | 26,453
Machinery | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (20,510) |  |
Ending balance |  | (27,594) |  | (20,510)
Ships |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 2,313,305 |  | 2,596,863
Increase |  | 0 |  | 199,538
Depreciation |  | (363,032) |  | (382,298)
Decrease |  | (1,656) |  | 0
Others |  | (17,524) |  | (100,798)
Ending balance |  | 1,931,093 |  | 2,313,305
Ships | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 4,137,168 |  |
Ending balance |  | 3,946,265 |  | 4,137,168
Ships | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (1,823,863) |  |
Ending balance |  | (2,015,172) |  | (1,823,863)
Vehicles |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 25,491 |  | 14,716
Increase |  | 11,042 |  | 21,097
Depreciation |  | (14,167) |  | (10,464)
Decrease |  | (77) |  | (1,008)
Others |  | (1,369) |  | 1,150
Ending balance |  | 20,920 |  | 25,491
Vehicles | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 59,208 |  |
Ending balance |  | 59,402 |  | 59,208
Vehicles | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (33,717) |  |
Ending balance |  | (38,482) |  | (33,717)
Others |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 235,215 | [1] | 338,091
Increase |  | 17,372 |  | 13,860
Depreciation |  | (36,502) |  | (51,138)
Decrease |  | (3) |  | (302)
Others |  | 26,939 |  | (65,296)
Ending balance | [1] | 243,021 |  | 235,215
Others | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance | [1] | 646,894 |  |
Ending balance | [1] | 686,400 |  | 646,894
Others | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance | [1] | (411,679) |  |
Ending balance | [1] | ₩ (443,379) |  | ₩ (411,679)
[1] | Including a power purchase agreement (“PPA”) with CGN Yulchon Generation Co., Ltd.

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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_h&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease in right-of-use assets resulting from disposals and retirements. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2024-01-01 -Paragraph 73 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2024-en-r&anchor=para_73_e&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_j&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_a&doctype=Standard -URIDate 2024-03-27 + Details
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