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Details of expense relating to defined benefit plans by nature (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure - Details of expense relating to defined benefit plans by nature [Abstract]      
Defined benefit allocated to Cost of sales ₩ 308,672 ₩ 332,249 ₩ 312,391
Defined benefit allocated to Selling, general and administrative expense 51,903 59,111 61,362
Defined benefit allocated to others 54,109 48,622 47,963
Defined benefit ₩ 414,684 ₩ 439,982 ₩ 421,716