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Net defined benefit liability (asset) (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of defined benefit plans [Line Items]
Beginning balance		₩ 1,638,785	₩ 1,476,201
Changes in net defined benefit liability (asset)
Current service cost		440,300	369,899	₩ 392,820
Interest expense (income)		42,022
Remeasurement component		(82,550)	167,247
Past service cost		301,442
Loss from settlement		(2,017)	(767)	(1,055)
Contributions by the employers		(348,386)
Actual payments		(65,242)
Others		(267)
Ending balance		1,924,087	1,638,785	1,476,201
Defined benefit obligation
Disclosure of defined benefit plans [Line Items]
Beginning balance		3,414,116	2,951,842
Changes in net defined benefit liability (asset)
Current service cost		440,300	369,899
Interest expense (income)	[1]	83,619	87,687
Remeasurement component		(93,736)	154,939
Past service cost		301,442
Loss from settlement		(2,017)	(767)
Actual payments		(108,057)	(149,454)
Others		(267)	(30)
Ending balance		4,035,400	3,414,116	2,951,842
Plan assets
Disclosure of defined benefit plans [Line Items]
Beginning balance		(1,775,331)	(1,475,641)
Changes in net defined benefit liability (asset)
Interest expense (income)		(41,597)	(42,135)
Remeasurement component		11,186	12,308
Contributions by the employers		(348,386)	(330,064)
Actual payments		42,815	60,201
Ending balance		₩ (2,111,313)	₩ (1,775,331)	₩ (1,475,641)
[1] Corporate bond (AAA rated) yield at year-end is applied to measure the interest cost on employee benefit obligations.

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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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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain 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 decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]]

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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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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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