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Employment Benefits - Net Defined Benefit Liability and Asset (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Changes in net defined benefit liability (asset)
Remeasurement component	₩ 435,701	₩ 404,858
Defined benefit obligation
Disclosure of defined benefit plans [line items]
Beginning balance	4,312,702	3,776,715
Changes in net defined benefit liability (asset)
Current service cost	430,308	373,802
Interest cost	184,169	190,257
Remeasurement component	425,671	409,635
Past service cost	0	0
Actual payments	(392,336)	(437,734)
Others	131	27
Ending balance	4,960,645	4,312,702
Plan assets
Disclosure of defined benefit plans [line items]
Beginning balance	3,349,480	3,149,414
Changes in net defined benefit liability (asset)
Interest cost	141,108	163,074
Remeasurement component	(10,030)	4,777
Contributions by the employers	254,763	188,566
Actual payments	(184,088)	(156,351)
Ending balance	₩ 3,551,233	₩ 3,349,480

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- References

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The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]]

+ References

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

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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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The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

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The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)]

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

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The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

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The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]]

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

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