Other Financial Assets and Liabilities - Summary of Hedged items (Detail) - Derivatives [member] - KRW (₩) ₩ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	₩ 2,848,287	₩ 3,058,980
Changes in fair value to calculate the ineffective portion of hedges	(45,380)	(193,198)
Cash flow hedge reserves	(28,893)	(5,458)
USD
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	2,593,707	2,675,885
Changes in fair value to calculate the ineffective portion of hedges	(44,365)	(170,010)
Cash flow hedge reserves	(30,415)	(13,947)
JPY
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	3,651	3,813
Changes in fair value to calculate the ineffective portion of hedges	162	308
Cash flow hedge reserves	49	116
SGD
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	0	267,843
Changes in fair value to calculate the ineffective portion of hedges	0	(18,720)
Cash flow hedge reserves	0	3,406
EUR
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	10,985	10,404
Changes in fair value to calculate the ineffective portion of hedges	(581)	(121)
Cash flow hedge reserves	158	582
KRW
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	239,944	101,035
Changes in fair value to calculate the ineffective portion of hedges	(596)	(4,655)
Cash flow hedge reserves	₩ 1,315	₩ 4,385

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

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- Definition

The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24B
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_a_iv&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24B
-Subparagraph b
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_b_i&doctype=Standard
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- Definition

The amount of a hedged item, recognised as an asset. [Refer: Hedged items [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 24B
-Subparagraph a
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_24B_a_i&doctype=Standard
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- Definition

A component of equity representing the reserve of cash flow hedges in relation to continuing hedges. [Refer: Reserve of cash flow hedges]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
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-URIDate 2023-03-23

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