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Net Defined Benefit Liabilities - Summary of Amounts Recognized in the Consolidated Statements of Operations (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Changes in net defined benefit liability (asset) [abstract]
Current service cost	₩ 238,068	₩ 249,125	₩ 248,047
Net Interest cost	3,139	5,047	6,494
Changes due to settlements of plan & Past Service Cost	(701)	(681)	1,075
Transfer out	(15,102)	(16,660)	(16,514)
Total expenses	₩ 225,404	₩ 236,831	₩ 239,102

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- References

No definition available.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost and losses (gains) arising from settlements. [Refer: Decrease (increase) in net defined benefit liability (asset) resulting from gains (losses) arising from settlements; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
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-URIDate 2022-03-24

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- Definition

The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss]

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

Transfer out to net defined benefit plan expenses.

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No definition available.

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