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Changes in financial assets at fair value through other comprehensive income (Details)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
KRW (₩)
Changes in financial assets at fair value through other comprehensive income [Line Items]  
Beginning balance ₩ 0
Effect of change in accounting policy 471,903 [1]
Acquisition 0
Disposal (1)
Valuation (75,077)
Impairment 0
Others 2,670
Ending Balance 399,495
Listed equity securities  
Changes in financial assets at fair value through other comprehensive income [Line Items]  
Beginning balance 0
Effect of change in accounting policy 274,453 [1]
Acquisition 0
Disposal (1)
Valuation (63,007)
Impairment 0
Others (1,389)
Ending Balance 210,056
Unlisted equity securities  
Changes in financial assets at fair value through other comprehensive income [Line Items]  
Beginning balance 0
Effect of change in accounting policy 197,450 [1]
Acquisition 0
Disposal 0
Valuation (12,070)
Impairment 0
Others 4,059
Ending Balance 189,439 [2]
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
Effect of change in accounting policy 0 [1]
Acquisition 0
Disposal 0
Valuation 0
Impairment 0
Others 0
Ending Balance 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 0
Effect of change in accounting policy 471,903 [1]
Acquisition 0
Disposal (1)
Valuation (75,077)
Impairment 0
Others 2,670
Ending Balance ₩ 399,495
[1] As described in note 2.(5), these financial assets were classified as available-for-sale as of December 31, 2017.
[2] 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.