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Changes in retained earnings (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Changes in retained earnings [Abstract]      
Beginning balance ₩ 49,202,133 ₩ 51,519,119  
Effect of change in accounting policy 0 0  
Net profit (loss) for the period attributed to owner of the Company 1,991,347 (2,345,517) ₩ (1,314,567)
Changes in equity method retained earnings      
Beginning balance (2,820) 3,969  
Ending balance 361 (2,820) 3,969
Changes 3,181 (6,789)  
Remeasurements of defined benefit liability, net of tax (62,857) 36,160  
Transfer of gain (loss) on valuation of financial assets through other comprehensive income 0 (840)  
Transactions between consolidated entities (203) 0  
Dividend paid 0 0 (507,152)
Ending balance ₩ 51,133,601 ₩ 49,202,133 ₩ 51,519,119