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Changes in financial assets at fair value through other comprehensive income (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in financial assets at fair value through other comprehensive income [Line Items]    
Beginning balance ₩ 399,495 ₩ 0
Effect of change in accounting policy 0 471,903
Acquisition 1,876 0
Disposal (19,315) (1)
Valuation (8,019) (75,077)
Impairment 0 0
Others 5,133 2,670
Ending Balance 379,170 399,495
Listed equity securities    
Changes in financial assets at fair value through other comprehensive income [Line Items]    
Beginning balance 210,056 0
Effect of change in accounting policy 0 274,453
Acquisition 0 0
Disposal 0 (1)
Valuation (11,734) (63,007)
Impairment 0 0
Others 2,880 (1,389)
Ending Balance 201,202 210,056
Unlisted equity securities    
Changes in financial assets at fair value through other comprehensive income [Line Items]    
Beginning balance 189,439 [1] 0
Effect of change in accounting policy 0 197,450
Acquisition 1,876 0
Disposal (19,315) 0
Valuation 3,715 (12,070)
Impairment 0 0
Others 2,253 4,059
Ending Balance [1] 177,968 189,439
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
Effect of change in accounting policy 0 0
Acquisition 0 0
Disposal 0 0
Valuation 0 0
Impairment 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 399,495 0
Effect of change in accounting policy 0 471,903
Acquisition 1,876 0
Disposal (19,315) (1)
Valuation (8,019) (75,077)
Impairment 0 0
Others 5,134 2,670
Ending Balance ₩ 379,170 ₩ 399,495
[1] The Company used initial cost as their fair value because there was not enough information to determine fair value, and the range of the estimated fair value is wide.