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Related Parties - Summary of Guarantees Provided To Associates Or Joint Ventures (Parentheticals) (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2021 KRW (₩)
Derivative liabilities [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Provision of guarantees or collateral by entity	₩ 6,760
Acquisition cost of the securities [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Provision of guarantees or collateral by entity	47,067
Other provisions [member]
Disclosure of Guarantees provided between the related parties [Line Items]
Provision of guarantees or collateral by entity	26,772
Impairment loss [Member] | Incheon New Power Co., Ltd [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Provision of guarantees or collateral by entity	461
Impairment loss [Member] | Naepo Green Energy Co., Ltd [Member]
Disclosure of Guarantees provided between the related parties [Line Items]
Provision of guarantees or collateral by entity	₩ 29,200

X

- Definition

The amount of guarantees or collateral provided by the entity in related party transactions. [Refer: Guarantees [member]; Related parties [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 24
-IssueDate 2021-01-01
-Paragraph 21
-Subparagraph h
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=24&code=ifrs-tx-2021-en-r&anchor=para_21_h&doctype=Standard
-URIDate 2021-03-24

+ Details

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X

- References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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