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Reporting Entity (Description of the Controlling Company) - Summary of the Company's Shareholders (Details) - shares | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of shareholders information [Line Items] |  |  |
Number of shares | 641,964,077 | 641,964,077 | 641,964,077
Percentage of ownership | 100.00% |  |
The Government of the Republic of Korea |  |  |
Disclosure of shareholders information [Line Items] |  |  |
Number of shares | 116,841,794 |  |
Percentage of ownership | 18.20% |  |
Korea Development Bank (KDB) |  |  |
Disclosure of shareholders information [Line Items] |  |  |
Number of shares | 211,235,264 |  |
Percentage of ownership | 32.90% |  |
Foreign investors |  |  |
Disclosure of shareholders information [Line Items] |  |  |
Number of shares | 91,105,897 |  |
Percentage of ownership | 14.19% |  |
Other |  |  |
Disclosure of shareholders information [Line Items] |  |  |
Number of shares | 222,781,122 |  |
Percentage of ownership | 34.71% |  |

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- Definition The number of shares issued by the entity, for which full payment has been received. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 79 -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_ii&doctype=Standard -URIDate 2021-03-24 + Details
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