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Financial Assets at Fair Value through Profit or Loss (Details) ₩ in Millions | Dec. 31, 2018 KRW (₩) | [1]
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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)).

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