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Gain (loss) on remeasurement, net defined benefit liability (asset) (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Gain (loss) on remeasurement, net defined benefit liability (asset) [Abstract]    
Actuarial gain from changes in financial assumptions ₩ (2,916) ₩ 186,428
Experience adjustments (90,820) (31,489)
Expected return 11,186 12,308
Total loss (gain) on remeasurement, net defined benefit liability (asset) ₩ (82,550) ₩ 167,247