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Leases - Summary of Right-of-Use Assets (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Depreciation |  | ₩ (536,517) |  | ₩ (509,068)
Right-of-use assets |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 3,711,125 |  | 4,059,397
Increase |  | 261,862 |  | 197,016
Depreciation |  | (536,517) |  | (509,068)
Decrease |  | (2,613) |  | (2,838)
Others |  | (70,114) |  | (33,382)
Ending balance |  | 3,363,743 |  | 3,711,125
Right-of-use assets | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 5,992,724 |  |
Ending balance |  | 6,041,794 |  | 5,992,724
Right-of-use assets | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (2,281,599) |  |
Ending balance |  | (2,678,051) |  | (2,281,599)
Land |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 661,799 |  | 652,795
Increase |  | 2,696 |  | 63,654
Depreciation |  | (57,461) |  | (41,260)
Decrease |  | (126) |  | 0
Others |  | 48,952 |  | (13,390)
Ending balance |  | 655,860 |  | 661,799
Land | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 886,076 |  |
Ending balance |  | 937,481 |  | 886,076
Land | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (224,277) |  |
Ending balance |  | (281,621) |  | (224,277)
Buildings |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 74,856 |  | 62,884
Increase |  | 24,622 |  | 42,399
Depreciation |  | (32,591) |  | (30,243)
Decrease |  | (904) |  | (1,042)
Others |  | 24,590 |  | 858
Ending balance |  | 90,573 |  | 74,856
Buildings | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 135,290 |  |
Ending balance |  | 188,017 |  | 135,290
Buildings | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (60,434) |  |
Ending balance |  | (97,444) |  | (60,434)
Structures |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 23,965 |  | 21,148
Increase |  | 49 |  | 4,256
Depreciation |  | (2,471) |  | (1,758)
Decrease |  | (273) |  | 0
Others |  | 16,086 |  | 319
Ending balance |  | 37,356 |  | 23,965
Structures | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 30,879 |  |
Ending balance |  | 46,573 |  | 30,879
Structures | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (6,914) |  |
Ending balance |  | (9,217) |  | (6,914)
Machinery |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 835 |  | 565
Increase |  | 0 |  | 429
Depreciation |  | (94) |  | (159)
Decrease |  | 0 |  | 0
Others |  | 5,202 |  | 0
Ending balance |  | 5,943 |  | 835
Machinery | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 1,737 |  |
Ending balance |  | 26,453 |  | 1,737
Machinery | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (902) |  |
Ending balance |  | (20,510) |  | (902)
Ships |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 2,596,863 |  | 3,029,219
Increase |  | 199,538 |  | 0
Depreciation |  | (382,298) |  | (393,677)
Decrease |  | 0 |  | 0
Others |  | (100,798) |  | (38,679)
Ending balance |  | 2,313,305 |  | 2,596,863
Ships | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 4,151,460 |  |
Ending balance |  | 4,137,168 |  | 4,151,460
Ships | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (1,554,597) |  |
Ending balance |  | (1,823,863) |  | (1,554,597)
Vehicles |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 14,716 |  | 13,618
Increase |  | 21,097 |  | 13,475
Depreciation |  | (10,464) |  | (8,673)
Decrease |  | (1,008) |  | (962)
Others |  | 1,150 |  | (2,742)
Ending balance |  | 25,491 |  | 14,716
Vehicles | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 35,712 |  |
Ending balance |  | 59,208 |  | 35,712
Vehicles | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | (20,996) |  |
Ending balance |  | (33,717) |  | (20,996)
Others |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance |  | 338,091 | [1] | 279,168
Increase |  | 13,860 |  | 72,803
Depreciation |  | (51,138) |  | (33,298)
Decrease |  | (302) |  | (834)
Others |  | (65,296) |  | 20,252
Ending balance | [1] | 235,215 |  | 338,091
Others | Acquisition cost |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance | [1] | 751,570 |  |
Ending balance | [1] | 646,894 |  | 751,570
Others | Accumulated depreciation |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |
Beginning balance | [1] | (413,479) |  |
Ending balance | [1] | ₩ (411,679) |  | ₩ (413,479)
[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 2023-01-01 -Paragraph 53 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_h&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_j&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_a&doctype=Standard -URIDate 2023-03-23 + Details
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