Net Defined Benefit Liability (Asset) - Summary Of Sensitivity To Actuarial Assumptions Used In The Assessment Of Defined Benefit Obligation (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Discount rate \| Increase by 1% point
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Decrease in defined benefit obligation due to reasonably possible decrease in actuarial assumption	₩ (166,963)	₩ (182,522)
Discount rate \| Decrease by 1% point
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in defined benefit obligation due to reasonably possible increase in actuarial assumption	192,449	213,568
Future wage growth rate \| Increase by 1% point
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in defined benefit obligation due to reasonably possible increase in actuarial assumption	193,539	214,942
Future wage growth rate \| Decrease by 1% point
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Decrease in defined benefit obligation due to reasonably possible decrease in actuarial assumption	₩ (170,732)	₩ (185,974)

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

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