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Changes in financial assets at fair value through other comprehensive income (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in financial assets at fair value through other comprehensive income [Line Items]    
Beginning balance ₩ 379,170 ₩ 399,494
Acquisition 2,900 1,876
Disposal (5) (19,315)
Valuation (30,937) (8,019)
Others 7,431 5,134
Ending Balance 358,559 379,170
Listed equity securities    
Changes in financial assets at fair value through other comprehensive income [Line Items]    
Beginning balance 201,202 210,055
Acquisition 0 0
Disposal (4) 0
Valuation (7,809) (11,734)
Others 1,281 2,880
Ending Balance 194,669 201,202
Unlisted equity securities    
Changes in financial assets at fair value through other comprehensive income [Line Items]    
Beginning balance 177,968 189,439
Acquisition 2,900 1,876
Disposal (1) (19,315)
Valuation (23,128) 3,715
Others 6,150 2,254
Ending Balance 163,890 177,968
Current Financial assets at fair value through profit or loss, category    
Changes in financial assets at fair value through other comprehensive income [Line Items]    
Beginning balance 0 0
Acquisition 0 0
Disposal 0 0
Valuation 0 0
Others 0 0
Ending Balance 0 0
Non-Current Financial assets at fair value through profit or loss, category    
Changes in financial assets at fair value through other comprehensive income [Line Items]    
Beginning balance 379,170 399,494
Acquisition 2,900 1,876
Disposal (5) (19,315)
Valuation (30,937) (8,019)
Others 7,431 5,134
Ending Balance ₩ 358,559 ₩ 379,170