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Changes in retained earnings (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Changes in retained earnings [Abstract]      
Beginning balance ₩ 51,519,119 ₩ 53,370,558  
Effect of change in accounting policy 0 71,928  
Net profit (loss) for the period attributed to owner of the Company (2,345,517) (1,314,567) ₩ 1,298,720
Changes in equity method retained earnings      
Beginning balance 3,969 5,122  
Ending balance (2,820) 3,969 5,122
Changes (6,789) (1,153)  
Remeasurements of defined benefit liability, net of tax 36,160 (100,495)  
Transfer of gain (loss) on valuation of financial assets through other comprehensive income (840) 0  
Dividend paid 0 (507,152) (1,271,089)
Ending balance ₩ 49,202,133 ₩ 51,519,119 ₩ 53,370,558