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Net defined benefit liability (asset) (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of defined benefit plans [Line Items]
Beginning balance		₩ 1,678,470
Changes in net defined benefit liability (asset) [Abstract]
Current service cost		392,820	₩ 378,930	₩ 315,811
Remeasurement component		(247,788)	126,699
Loss from settlement		1,055	706	641
Ending balance		1,476,201	1,678,470
Defined benefit obligation [Member]
Disclosure of defined benefit plans [Line Items]
Beginning balance		2,867,377	2,426,414
Changes in net defined benefit liability (asset) [Abstract]
Current service cost		392,820	378,930
Interest expense (income)	[1]	79,524	67,104
Remeasurement component		(258,223)	120,993
Loss from settlement		(1,055)	(707)
Actual payments		(128,707)	(125,233)
Others		106	(124)
Ending balance		2,951,842	2,867,377	2,426,414
Plan assets [Member]
Disclosure of defined benefit plans [Line Items]
Beginning balance		(1,188,907)	(930,632)
Changes in net defined benefit liability (asset) [Abstract]
Interest expense (income)		(31,307)	(23,612)
Remeasurement component		10,435	5,706
Contributions by the employers		(325,080)	(312,125)
Actual payments		59,218	71,756
Ending balance		₩ (1,475,641)	₩ (1,188,907)	₩ (930,632)
[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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- 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 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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