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Gain (loss) on remeasurement, net defined benefit liability (asset) (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Gain (loss) on remeasurement, net defined benefit liability (asset) [Abstract]    
Actuarial gain from changes in financial assumptions ₩ 186,428 ₩ (300,058)
Experience adjustments (31,489) 41,835
Expected return 12,308 10,435
Total loss (gain) on remeasurement, net defined benefit liability (asset) ₩ 167,247 ₩ (247,788)