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Details of expense relating to defined benefit plans by nature (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure - Details of expense relating to defined benefit plans by nature [Abstract]      
Defined benefit allocated to Cost of sales ₩ 397,442 ₩ 580,623 ₩ 308,672
Defined benefit allocated to Selling, general and administrative expense 94,846 120,455 51,903
Defined benefit allocated to others 55,711 80,669 54,109
Defined benefit ₩ 547,999 ₩ 781,747 ₩ 414,684