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Inventories - Summary of Inventories (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Inventories [Line Items] |  |
Raw materials | ₩ 3,654,341 | ₩ 3,601,188
Merchandise | 512 | 234
Work-in-progress | 180,220 | 148,067
Finished goods | 27,254 | 42,070
Supplies | 2,537,159 | 2,272,790
Inventories in transit | 1,195,148 | 666,967
Other inventories | 13,548 | 11,593
Total Inventories | 7,608,182 | 6,742,909
Acquisition cost |  |
Inventories [Line Items] |  |
Raw materials | 3,655,588 | 3,602,073
Merchandise | 512 | 234
Work-in-progress | 180,220 | 148,067
Finished goods | 27,254 | 42,070
Supplies | 2,541,028 | 2,280,682
Inventories in transit | 1,195,148 | 666,967
Total Inventories | 7,613,298 | 6,751,686
Valuation allowance |  |
Inventories [Line Items] |  |
Raw materials | (1,247) | (885)
Merchandise | 0 | 0
Work-in-progress | 0 | 0
Finished goods | 0 | 0
Supplies | (3,869) | (7,892)
Inventories in transit | 0 | 0
Other inventories | 0 | 0
Total Inventories | ₩ (5,116) | ₩ (8,777)

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- Definition A classification of current inventory representing the amount of goods that have completed the production process and are held for sale in the ordinary course of business. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2021-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2021-en-r&anchor=para_37&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition A classification of current inventory representing the amount of goods acquired for resale. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2021-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2021-en-r&anchor=para_37&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of inventory that the entity does not separately disclose in the same statement or note. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2021-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2021-en-r&anchor=para_37&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition A classification of current inventory representing the amount of assets currently in production, which require further processes to be converted into finished goods or services. [Refer: Current finished goods; Inventories] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 2 -IssueDate 2021-01-01 -Paragraph 37 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2021-en-r&anchor=para_37&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_c&doctype=Standard -URIDate 2021-03-24 + Details
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