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Lease - Summary of Right-of-Use Assets (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Increase |  | ₩ 12,614,177 |  | ₩ 13,593,937 |
Depreciation |  | (554,615) |  | (586,254) |
Right-of-use assets |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 4,542,166 |  | 4,783,573 |
Increase |  | 78,213 |  | 291,334 |
Depreciation |  | (554,615) |  | (586,254) |
Decrease |  | (11,787) |  | (827) |
Others |  | 5,420 |  | 54,340 |
Ending balance |  | 4,059,397 |  | 4,542,166 |
Right-of-use assets | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 7,905,214 |  |  |
Ending balance |  | 7,848,138 |  | 7,905,214 |
Right-of-use assets | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | (3,363,048) |  |  |
Ending balance |  | (3,788,741) |  | (3,363,048) |
Land |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 706,579 |  | 644,074 |
Increase |  | 7,312 |  | 12,269 |
Depreciation |  | (57,231) |  | (52,069) |
Decrease |  | 0 |  | 0 |
Others |  | (3,865) |  | 102,305 |
Ending balance |  | 652,795 |  | 706,579 |
Land | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 811,014 |  |  |
Ending balance |  | 814,795 |  | 811,014 |
Land | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | (104,435) |  |  |
Ending balance |  | (162,000) |  | (104,435) |
Buildings |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 47,222 |  | 34,577 |
Increase |  | 22,336 |  | 53,182 |
Depreciation |  | (25,780) |  | (37,609) |
Decrease |  | (1,469) |  | (803) |
Others |  | 20,575 |  | (2,125) |
Ending balance |  | 62,884 |  | 47,222 |
Buildings | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 82,749 |  |  |
Ending balance |  | 106,823 |  | 82,749 |
Buildings | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | (35,527) |  |  |
Ending balance |  | (43,939) |  | (35,527) |
Structures |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 20,486 |  | 25,644 |
Increase |  | 2,198 |  | 260 |
Depreciation |  | (1,536) |  | (1,485) |
Decrease |  | 0 |  | 0 |
Others |  | 0 |  | (3,933) |
Ending balance |  | 21,148 |  | 20,486 |
Structures | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 24,175 |  |  |
Ending balance |  | 26,374 |  | 24,175 |
Structures | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | (3,689) |  |  |
Ending balance |  | (5,226) |  | (3,689) |
Machinery |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 695 |  | 824 |
Increase |  | 0 |  | 0 |
Depreciation |  | (130) |  | (129) |
Decrease |  | 0 |  | 0 |
Others |  | 0 |  | 0 |
Ending balance |  | 565 |  | 695 |
Machinery | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 1,308 |  |  |
Ending balance |  | 1,308 |  | 1,308 |
Machinery | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | (613) |  |  |
Ending balance |  | (743) |  | (613) |
Ships |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 3,437,363 |  | 3,688,289 |
Increase |  | 9,694 |  | 183,789 |
Depreciation |  | (411,291) |  | (427,221) |
Decrease |  | 0 |  | 0 |
Others |  | (6,547) |  | (7,494) |
Ending balance |  | 3,029,219 |  | 3,437,363 |
Ships | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 4,280,331 |  |  |
Ending balance |  | 4,217,735 |  | 4,280,331 |
Ships | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | (842,968) |  |  |
Ending balance |  | (1,188,516) |  | (842,968) |
Vehicles |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 13,525 |  | 13,708 |
Increase |  | 9,583 |  | 9,009 |
Depreciation |  | (8,162) |  | (7,747) |
Decrease |  | (7) |  | (21) |
Others |  | (1,321) |  | (1,424) |
Ending balance |  | 13,618 |  | 13,525 |
Vehicles | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 29,281 |  |  |
Ending balance |  | 30,375 |  | 29,281 |
Vehicles | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | (15,756) |  |  |
Ending balance |  | (16,757) |  | (15,756) |
Others |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance |  | 316,296 | [1] | 376,457 |
Increase |  | 27,090 |  | 32,825 |
Depreciation |  | (50,485) |  | (59,994) |
Decrease |  | (10,311) |  | (3) |
Others |  | (3,422) |  | (32,989) |
Ending balance |  | 279,168 | [2] | 316,296 | [1]
Others | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance | [1] | 2,676,356 |  |  |
Ending balance |  | 2,650,728 | [2] | 2,676,356 | [1]
Others | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |  |  |
Beginning balance | [1] | (2,360,060) |  |  |
Ending balance |  | ₩ (2,371,560) | [2] | ₩ (2,360,060) | [1]
[1] | Including power purchase agreements (“PPA”) with GS EPS and another LNG combined power supplier.
[2] | Including a power purchase agreement (“PPA”) with CGN Yulchon Generation Co., Ltd.

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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_a&doctype=Standard -URIDate 2021-03-24 + 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. 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 2021-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_j&doctype=Standard -URIDate 2021-03-24 + Details
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