Other Financial Assets and Liabilities - Summary of Hedged items (Detail) - Derivatives [member] - KRW (₩) ₩ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	₩ 3,058,980	₩ 2,970,459
Changes in fair value to calculate the ineffective portion of hedges	(193,198)	(185,544)
Cash flow hedge reserves	(5,458)		₩ 25,184
USD
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	2,675,885	2,401,943
Changes in fair value to calculate the ineffective portion of hedges	(170,010)	(177,120)
Cash flow hedge reserves	(13,947)		21,826
JPY
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	3,813	309,072
Changes in fair value to calculate the ineffective portion of hedges	308	7,199
Cash flow hedge reserves	116		269
SGD
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	267,843	249,108
Changes in fair value to calculate the ineffective portion of hedges	(18,720)	(15,570)
Cash flow hedge reserves	3,406		3,071
EUR
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	10,404	10,336
Changes in fair value to calculate the ineffective portion of hedges	(121)	(53)
Cash flow hedge reserves	582		₩ 18
KRW
Disclosure of detailed information about hedged items [line items]
Book value of hedged items	101,035	0
Changes in fair value to calculate the ineffective portion of hedges	(4,655)	0
Cash flow hedge reserves	₩ 4,385	₩ 0

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.

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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 2022-03-24
-Paragraph 24B
-Subparagraph a
-Clause iv
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 24B
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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 2022-03-24
-Paragraph 24B
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-Clause i
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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
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