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Risk Management - Summary of Fair Value Measurement of Assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	₩ 502,443	₩ 502,829	₩ 435,107
At fair value
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	502,443	502,829
Derivative assets	1,000,394	1,018,024
Financial assets at fair value through profit or loss	2,711,285	3,709,508
Total	4,214,122	5,230,361
At fair value | Level 1
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	285,054	300,057
Derivative assets	0	0
Financial assets at fair value through profit or loss	0	0
Total	285,054	300,057
At fair value | Level 2
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	0	0
Derivative assets	1,000,394	1,018,024
Financial assets at fair value through profit or loss	2,704,550	3,703,179
Total	3,704,944	4,721,203
At fair value | Level 3
Disclosure of fair value measurement of assets [line items]
Financial assets at fair value through other comprehensive income	217,389	202,772
Derivative assets	0	0
Financial assets at fair value through profit or loss	6,735	6,329
Total	₩ 224,124	₩ 209,101

X

- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 8
-Subparagraph h
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- Definition

The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets]

+ References

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Fair value measurement of assets.

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