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Financial Assets at Fair Value through Profit or Loss (Details)
₩ in Millions
Dec. 31, 2018
KRW (₩)
 [1]
Financial Assets At Fair Value Through Profit Or Loss [Line Items]  
Current financial assets at fair value through profit or loss ₩ 313,893
Non-current financial assets at fair value through profit or loss 607,042
Financial assets at fair value through profit or loss  
Financial Assets At Fair Value Through Profit Or Loss [Line Items]  
Current financial assets at fair value through profit or loss 313,893
Non-current financial assets at fair value through profit or loss 408,786
Financial assets at fair value through profit or loss | Beneficiary securities  
Financial Assets At Fair Value Through Profit Or Loss [Line Items]  
Current financial assets at fair value through profit or loss 100 [2]
Non-current financial assets at fair value through profit or loss 320,148 [2]
Financial assets at fair value through profit or loss | Cooperative securities  
Financial Assets At Fair Value Through Profit Or Loss [Line Items]  
Current financial assets at fair value through profit or loss 0 [2]
Non-current financial assets at fair value through profit or loss 5,052 [2]
Financial assets at fair value through profit or loss | Other  
Financial Assets At Fair Value Through Profit Or Loss [Line Items]  
Current financial assets at fair value through profit or loss 313,793 [3]
Non-current financial assets at fair value through profit or loss 83,586 [3]
Financial assets designated as at fair value through profit or loss  
Financial Assets At Fair Value Through Profit Or Loss [Line Items]  
Current financial assets at fair value through profit or loss 0
Non-current financial assets at fair value through profit or loss 198,256
Financial assets designated as at fair value through profit or loss | Debt with embedded derivatives  
Financial Assets At Fair Value Through Profit Or Loss [Line Items]  
Current financial assets at fair value through profit or loss 0 [3]
Non-current financial assets at fair value through profit or loss 187,483 [3]
Financial assets designated as at fair value through profit or loss | Other  
Financial Assets At Fair Value Through Profit Or Loss [Line Items]  
Current financial assets at fair value through profit or loss 0
Non-current financial assets at fair value through profit or loss ₩ 10,773
[1] As of December 31, 2018, the Company invested KRW528,006 million exclusively for payment of decommissioning costs of nuclear power plants.
[2] For the year ended December 31, 2017, the Company had designated the financial assets as available-for-sale (note 2.(5)).
[3] For the year ended December 31, 2017, the Company had designated the financial assets as long-term/short-term financial instrument (note 2.(5)).