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Net Defined Benefit Liabilities - Summary of Amount Recognized in the Statements of Financial Position (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of net defined benefit liability (asset) [abstract]
Present value of defined benefit obligations	₩ 2,201,876	₩ 1,911,166
Fair value of plan assets	(1,643,046)	(1,519,779)
Liabilities	561,269	395,079	₩ 378,404
Assets in the statement of financial position	₩ 2,439	₩ 3,692

X

- Definition

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

+ References

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- References

No definition available.

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- Definition

The amount of non-current net defined benefit asset. [Refer: Net defined benefit asset]

+ References

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- Definition

The amount of non-current net defined benefit liability. [Refer: Net defined benefit liability]

+ References

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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

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