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Details of the fair value of plan assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of fair value of plan assets [Abstract]
Equity instruments	₩ 253,358	₩ 189,235
Debt instruments	822,582	648,265
Bank deposit	284,655	199,743
Others	1,310,237	1,074,070
Plan assets	₩ 2,670,832	₩ 2,111,313

X

- Definition

The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]]

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- Definition

The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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- Definition

The amount instruments representing equity (rather than debt) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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- Definition

The amount other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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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]]

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