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Employment Benefits - Net Defined Benefit Liability and Asset (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of defined benefit plans [line items]
Beginning balance	₩ (825,927)
Changes in net defined benefit liability (asset)
Current service cost	373,802	₩ 496,722	₩ 524,942
Remeasurement component	404,858	(1,001,118)
Past service cost	0	125	5,483
Ending balance	(1,033,409)	(825,927)
Defined benefit obligation
Disclosure of defined benefit plans [line items]
Beginning balance	3,776,715	4,564,417
Changes in net defined benefit liability (asset)
Current service cost	373,802	496,722
Interest cost	190,257	116,256
Remeasurement component	409,635	(1,012,727)
Past service cost	0	125
Actual payments	(437,734)	(388,105)
Others	27	27
Ending balance	4,312,702	3,776,715	4,564,417
Plan assets
Disclosure of defined benefit plans [line items]
Beginning balance	3,149,414	2,909,547
Changes in net defined benefit liability (asset)
Interest cost	163,074	73,484
Remeasurement component	4,777	(11,609)
Contributions by the employers	188,566	347,778
Actual payments	(156,351)	(169,786)
Ending balance	₩ 3,349,480	₩ 3,149,414	₩ 2,909,547

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- References

No definition available.

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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 [member]]

+ References

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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)]

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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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- Definition

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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- 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)]

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- Definition

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 [member]]

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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 [member]]

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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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Liability asset of defined benefit plans net recognised assets defined benefit plan.

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