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Net defined benefit liability (asset) (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of defined benefit plans [Line Items]
Beginning balance		₩ 1,476,201
Changes in net defined benefit liability (asset)
Current service cost		369,899	₩ 392,820	₩ 378,930
Remeasurement component		167,247	(247,788)
Loss from settlement		767	1,055	706
Ending balance		1,638,785	1,476,201
Defined benefit obligation
Disclosure of defined benefit plans [Line Items]
Beginning balance		2,951,842	2,867,377
Changes in net defined benefit liability (asset)
Current service cost		369,899	392,820
Interest expense (income)	[1]	87,687	79,524
Remeasurement component		154,939	(258,223)
Loss from settlement		(767)	(1,055)
Actual payments		(149,454)	(128,707)
Others		(30)	106
Ending balance		3,414,116	2,951,842	2,867,377
Plan assets
Disclosure of defined benefit plans [Line Items]
Beginning balance		(1,475,641)	(1,188,907)
Changes in net defined benefit liability (asset)
Interest expense (income)		(42,135)	(31,307)
Remeasurement component		12,308	10,435
Contributions by the employers		(330,064)	(325,080)
Actual payments		60,201	59,218
Ending balance		₩ (1,775,331)	₩ (1,475,641)	₩ (1,188,907)
[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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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 [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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