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Gain (loss) on remeasurement, net defined benefit liability (asset) (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Gain (loss) on remeasurement, net defined benefit liability (asset) [Abstract]    
Actuarial gain from changes in financial assumptions ₩ (2,979) ₩ (2,916)
Experience adjustments 87,364 (90,820)
Expected return 390 11,186
Total loss (gain) on remeasurement, net defined benefit liability (asset) ₩ 84,775 ₩ (82,550)