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Changes in lease liabilities (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure - Changes in lease liabilities [Abstract]    
Beginning balance ₩ 5,070,133 ₩ 283,806
Changes in accounting policies 0 4,943,584
Increase 280,114 218,800
Decrease (725,759) (659,387)
Interest expenses on lease liabilities 111,782 85,950
Effect of exchange rate fluctuations and others [1] (115,174) 197,380
Ending balance ₩ 4,621,096 ₩ 5,070,133
[1] Including translation effect of foreign currency lease liabilities and others.