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Statement of Appropriation of retained earnings (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Statement of Appropriation of Retained Earnings [Abstract]    
Unappropriated retained earnings carried over from prior years ₩ 0 ₩ 0
Effect of change in accounting policy 0 39,813
Net income (loss) (2,594,957) (1,095,213)
Remeasurements of defined benefit plans (11,402) (65,442)
Retained earnings before appropriations (2,606,359) (1,120,842)
Transfer from voluntary reserves 2,606,359 1,120,842
Subtotal (I+II) 0 0
Appropriations of retained earnings ₩ 0 0
Unappropriated retained earnings to be carried over to subsequent year   ₩ 0