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Statement of Appropriation of retained earnings (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement of Appropriation of Retained Earnings [Abstract]    
Unappropriated retained earnings carried over from prior years ₩ 0 ₩ 0
Effect of change in accounting policy 39,813 0
Net income (loss) (1,095,213) 1,506,852
Remeasurements of defined benefit plans (65,442) 72,723
Retained earnings before appropriations (1,120,842) 1,579,575
Transfer from voluntary reserves 1,120,842 0
Subtotal (I+II) 0 1,579,575
Appropriations of retained earnings 0 (1,579,575)
Legal reserve 0 0
Dividends (government, individual) Amount of dividends per share (%) : Current year - W790 (16%) Prior year - W1,980 (40%) 0 (507,152)
Reserve for business expansion 0 (1,072,423)
Unappropriated retained earnings to be carried over to subsequent year ₩ 0 ₩ 0