Net Defined Benefit Liabilities (Assets) - Schedule of Changes in the Fair Value of Plan Assets (Details) - KRW (₩) ₩ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Changes in net defined benefit liability (asset) resulting from expense (income) in profit or loss [abstract]
Interest income	₩ 3,670	₩ 8,826	₩ 17,462
Plan assets
Changes in net defined benefit liability (asset) resulting from expense (income) in profit or loss [abstract]
Beginning	2,153,792	2,462,925
Interest income	72,685	97,708
Remeasurements:
Return on plan assets (excluding amounts included in interest income)	995	(154)
Benefits paid	(190,569)	(583,162)
Employer contributions	269,591	172,622
Acquisition and disposition of businesses, etc.	(14,037)	3,853
Ending	₩ 2,292,457	₩ 2,153,792	₩ 2,462,925

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- Definition

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]]

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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)]

+ References

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- Definition

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 [domain]]

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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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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [domain]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

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