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Disclosure of quantitative information about right-of-use assets (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Effect of change in accounting policy |  | ₩ 0 |  | ₩ 4,947,947 |
Increase |  | 13,593,937 |  | 14,221,355 |
Depreciation |  | (586,254) |  | (581,074) |
Right-of-use assets |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 4,783,573 |  | 0 |
Effect of change in accounting policy | [1] |  |  | 5,143,651 |
Increase |  | 291,334 |  | 220,996 |
Depreciation |  | (586,254) |  | (581,074) |
Decrease |  | (827) |  |  |
Others |  | 54,340 |  |  |
Ending balance |  | 4,542,166 |  | 4,783,573 |
Right-of-use assets | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 7,574,010 |  | 0 |
Ending balance |  | 7,905,214 |  | 7,574,010 |
Right-of-use assets | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | (2,790,437) |  | 0 |
Ending balance |  | (3,363,048) |  | (2,790,437) |
Land |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 644,074 |  | 0 |
Effect of change in accounting policy |  |  |  | 684,386 |
Increase |  | 12,269 |  | 8,717 |
Depreciation |  | (52,069) |  | (49,029) |
Decrease |  | 0 |  |  |
Others |  | 102,305 |  |  |
Ending balance |  | 706,579 |  | 644,074 |
Land | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 693,103 |  | 0 |
Ending balance |  | 811,014 |  | 693,103 |
Land | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | (49,029) |  | 0 |
Ending balance |  | (104,435) |  | (49,029) |
Buildings |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 34,577 |  | 0 |
Effect of change in accounting policy |  |  |  | 36,874 |
Increase |  | 53,182 |  | 18,106 |
Depreciation |  | (37,609) |  | (20,403) |
Decrease |  | (803) |  |  |
Others |  | (2,125) |  |  |
Ending balance |  | 47,222 |  | 34,577 |
Buildings | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 54,980 |  | 0 |
Ending balance |  | 82,749 |  | 54,980 |
Buildings | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | (20,403) |  | 0 |
Ending balance |  | (35,527) |  | (20,403) |
Structures |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 25,644 |  | 0 |
Effect of change in accounting policy |  |  |  | 20,840 |
Increase |  | 260 |  | 7,358 |
Depreciation |  | (1,485) |  | (2,554) |
Decrease |  | 0 |  |  |
Others |  | (3,933) |  |  |
Ending balance |  | 20,486 |  | 25,644 |
Structures | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 28,198 |  | 0 |
Ending balance |  | 24,175 |  | 28,198 |
Structures | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | (2,554) |  | 0 |
Ending balance |  | (3,689) |  | (2,554) |
Machinery |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 824 |  | 0 |
Effect of change in accounting policy |  |  |  | 0 |
Increase |  | 0 |  | 1,308 |
Depreciation |  | (129) |  | (484) |
Decrease |  | 0 |  |  |
Others |  | 0 |  |  |
Ending balance |  | 695 |  | 824 |
Machinery | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 1,308 |  | 0 |
Ending balance |  | 1,308 |  | 1,308 |
Machinery | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | (484) |  | 0 |
Ending balance |  | (613) |  | (484) |
Ships |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 3,688,289 |  | 0 |
Effect of change in accounting policy |  |  |  | 3,986,947 |
Increase |  | 183,789 |  | 126,807 |
Depreciation |  | (427,221) |  | (425,465) |
Decrease |  | 0 |  |  |
Others |  | (7,494) |  |  |
Ending balance |  | 3,437,363 |  | 3,688,289 |
Ships | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 4,113,754 |  | 0 |
Ending balance |  | 4,280,331 |  | 4,113,754 |
Ships | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | (425,465) |  | 0 |
Ending balance |  | (842,968) |  | (425,465) |
Vehicles |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 13,708 |  | 0 |
Effect of change in accounting policy |  |  |  | 11,258 |
Increase |  | 9,009 |  | 9,559 |
Depreciation |  | (7,747) |  | (7,109) |
Decrease |  | (21) |  |  |
Others |  | (1,424) |  |  |
Ending balance |  | 13,525 |  | 13,708 |
Vehicles | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 20,817 |  | 0 |
Ending balance |  | 29,281 |  | 20,817 |
Vehicles | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | (7,109) |  | 0 |
Ending balance |  | (15,756) |  | (7,109) |
Others |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 376,457 | [2] | 0 |
Effect of change in accounting policy |  |  |  | 403,346 |
Increase |  | 32,825 |  | 49,141 |
Depreciation |  | (59,994) |  | (76,030) |
Decrease |  | (3) |  |  |
Others |  | (32,989) |  |  |
Ending balance |  | 316,296 | [3] | 376,457 | [2]
Others | Acquisition cost |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | 2,661,850 | [2] | 0 |
Ending balance |  | 2,676,356 | [3] | 2,661,850 | [2]
Others | Accumulated depreciation |  |  |  |  |
Disclosure of quantitative information about right-of-use assets [Line Items] |  |  |  |  |
Beginning balance |  | (2,285,393) | [2] | 0 |
Ending balance |  | ₩ (2,360,060) | [3] | ₩ (2,285,393) | [2]
[1] | Including transferred amount of KRW195,704 million, which was classified as finance lease assets as of December 31, 2018.
[2] | Including power purchase agreements ("PPA") with GS EPS and two other LNG combined power suppliers.
[3] | Including power purchase agreements ("PPA") with GS EPS and another LNG combined power supplier.

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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 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
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