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Details of expense relating to defined benefit plans by nature (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure - Details of expense relating to defined benefit plans by nature [Abstract]      
Defined benefit allocated to Cost of sales ₩ 332,249 ₩ 312,391 ₩ 262,760
Defined benefit allocated to Selling, general and administrative expense 59,111 61,362 51,932
Defined benefit allocated to others 48,622 47,963 41,729
Defined benefit ₩ 439,982 ₩ 421,716 ₩ 356,421