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Classification of Financial Instruments - Classification of financial assets (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of Classification by categories of financial assets [Line Items] |  |  |  |  |
Cash and cash equivalents |  | ₩ 1,358,345 | ₩ 2,369,739 | ₩ 3,051,353 | ₩ 3,783,065
Categories of current financial assets |  |  |  |  |
Held-to-maturity investments |  |  | 5 |  |
Current financial assets at fair value through profit or loss | [1] | 313,893 |  |  |
Current financial assets at amortised cost |  | 11,956 |  |  |
Current Derivative assets |  | 42,107 | 12,935 | 193,283 |
Other financial assets |  | 1,991,939 | 1,945,417 |  |
Trade and other receivables |  | 7,793,592 | 7,928,972 |  |
Total current financial assets And Cash and cash equivalents |  | 11,511,832 | 12,257,068 |  |
Non-Financial Assets |  |  |  |  |
Available-for-sale financial assets |  |  | 699,833 |  |
Held-to-maturity investments |  |  | 3,139 |  |
Non-current financial assets at fair value through profit or loss | [1] | 607,042 |  |  |
Non-current financial assets at fair value through other comprehensive income |  | 399,495 |  |  |
Non-current financial assets at amortised cost |  | 2,086 |  |  |
Non-current Derivative assets |  | 60,228 | 19,691 | ₩ 588,091 |
Other financial assets |  | 1,044,762 | 1,316,250 |  |
Trade and other receivables |  | 1,819,845 | 1,754,797 |  |
Total non-current financial assets |  | 3,933,458 | 3,793,710 |  |
Total financial assets |  | 15,445,290 | 16,050,778 |  |
Financial assets at fair value through profit or loss |  |  |  |  |
Disclosure of Classification by categories of financial assets [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 |  |
Categories of current financial assets |  |  |  |  |
Held-to-maturity investments |  |  | 0 |  |
Current financial assets at fair value through profit or loss |  | 313,893 |  |  |
Current financial assets at amortised cost |  | 0 |  |  |
Current Derivative assets |  | 13,936 | 12,923 |  |
Other financial assets | [2] | 0 | 0 |  |
Trade and other receivables |  | 0 | 0 |  |
Total current financial assets And Cash and cash equivalents |  | 327,829 | 12,923 |  |
Non-Financial Assets |  |  |  |  |
Available-for-sale financial assets |  |  | 0 |  |
Held-to-maturity investments |  |  | 0 |  |
Non-current financial assets at fair value through profit or loss |  | 607,042 |  |  |
Non-current financial assets at fair value through other comprehensive income |  | 0 |  |  |
Non-current financial assets at amortised cost |  | 0 |  |  |
Non-current Derivative assets |  | 23,695 | 9,097 |  |
Other financial assets | [2] | 0 | 111,512 |  |
Trade and other receivables |  | 0 | 0 |  |
Total non-current financial assets |  | 630,737 | 120,609 |  |
Total financial assets |  | 958,566 | 133,532 |  |
Financial assets at fair value through other comprehensive income |  |  |  |  |
Disclosure of Classification by categories of financial assets [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 0 |  |  |
Categories of current financial assets |  |  |  |  |
Current financial assets at fair value through profit or loss |  | 0 |  |  |
Current financial assets at amortised cost |  | 0 |  |  |
Current Derivative assets |  | 0 |  |  |
Other financial assets |  | 0 |  |  |
Trade and other receivables |  | 0 |  |  |
Total current financial assets And Cash and cash equivalents |  | 0 |  |  |
Non-Financial Assets |  |  |  |  |
Non-current financial assets at fair value through profit or loss |  | 0 |  |  |
Non-current financial assets at fair value through other comprehensive income |  | 399,495 |  |  |
Non-current financial assets at amortised cost |  | 0 |  |  |
Non-current Derivative assets |  | 0 |  |  |
Other financial assets |  | 0 |  |  |
Trade and other receivables |  | 0 |  |  |
Total non-current financial assets |  | 399,495 |  |  |
Total financial assets |  | 399,495 |  |  |
Financial assets at amortized cost |  |  |  |  |
Disclosure of Classification by categories of financial assets [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 1,358,345 |  |  |
Categories of current financial assets |  |  |  |  |
Current financial assets at amortised cost |  | 11,956 |  |  |
Current Derivative assets |  | 0 |  |  |
Other financial assets |  | 1,991,939 |  |  |
Trade and other receivables |  | 7,793,592 |  |  |
Total current financial assets And Cash and cash equivalents |  | 11,155,832 |  |  |
Non-Financial Assets |  |  |  |  |
Non-current financial assets at fair value through profit or loss |  | 0 |  |  |
Non-current financial assets at fair value through other comprehensive income |  | 0 |  |  |
Non-current financial assets at amortised cost |  | 2,086 |  |  |
Non-current Derivative assets |  | 0 |  |  |
Other financial assets |  | 1,044,762 |  |  |
Trade and other receivables |  | 1,819,845 |  |  |
Total non-current financial assets |  | 2,866,693 |  |  |
Total financial assets |  | 14,022,525 |  |  |
Loans and receivables |  |  |  |  |
Disclosure of Classification by categories of financial assets [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  | 2,369,739 |  |
Categories of current financial assets |  |  |  |  |
Held-to-maturity investments |  |  | 0 |  |
Current Derivative assets |  |  | 0 |  |
Other financial assets |  |  | 1,945,417 |  |
Trade and other receivables |  |  | 7,928,972 |  |
Total current financial assets And Cash and cash equivalents |  |  | 12,244,128 |  |
Non-Financial Assets |  |  |  |  |
Available-for-sale financial assets |  |  | 0 |  |
Held-to-maturity investments |  |  | 0 |  |
Non-current Derivative assets |  |  | 0 |  |
Other financial assets |  |  | 1,204,738 |  |
Trade and other receivables |  |  | 1,754,797 |  |
Total non-current financial assets |  |  | 2,959,535 |  |
Total financial assets |  |  | 15,203,663 |  |
Financial assets available-for-sale |  |  |  |  |
Disclosure of Classification by categories of financial assets [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  | 0 |  |
Categories of current financial assets |  |  |  |  |
Held-to-maturity investments |  |  | 0 |  |
Current Derivative assets |  |  | 0 |  |
Other financial assets |  |  | 0 |  |
Trade and other receivables |  |  | 0 |  |
Total current financial assets And Cash and cash equivalents |  |  | 0 |  |
Non-Financial Assets |  |  |  |  |
Available-for-sale financial assets |  |  | 699,833 |  |
Held-to-maturity investments |  |  | 0 |  |
Non-current Derivative assets |  |  | 0 |  |
Other financial assets |  |  | 0 |  |
Trade and other receivables |  |  | 0 |  |
Total non-current financial assets |  |  | 699,833 |  |
Total financial assets |  |  | 699,833 |  |
Held-to-maturity investments |  |  |  |  |
Disclosure of Classification by categories of financial assets [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  | 0 |  |
Categories of current financial assets |  |  |  |  |
Held-to-maturity investments |  |  | 5 |  |
Current Derivative assets |  |  | 0 |  |
Other financial assets |  |  | 0 |  |
Trade and other receivables |  |  | 0 |  |
Total current financial assets And Cash and cash equivalents |  |  | 5 |  |
Non-Financial Assets |  |  |  |  |
Available-for-sale financial assets |  |  | 0 |  |
Held-to-maturity investments |  |  | 3,139 |  |
Non-current Derivative assets |  |  | 0 |  |
Other financial assets |  |  | 0 |  |
Trade and other receivables |  |  | 0 |  |
Total non-current financial assets |  |  | 3,139 |  |
Total financial assets |  |  | 3,144 |  |
Derivative assets (applying hedge accounting) |  |  |  |  |
Disclosure of Classification by categories of financial assets [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 |  |
Categories of current financial assets |  |  |  |  |
Held-to-maturity investments |  |  | 0 |  |
Current financial assets at fair value through profit or loss |  | 0 |  |  |
Current financial assets at amortised cost |  | 0 |  |  |
Current Derivative assets |  | 28,171 | 12 |  |
Other financial assets |  | 0 | 0 |  |
Trade and other receivables |  | 0 | 0 |  |
Total current financial assets And Cash and cash equivalents |  | 28,171 | 12 |  |
Non-Financial Assets |  |  |  |  |
Available-for-sale financial assets |  |  | 0 |  |
Held-to-maturity investments |  |  | 0 |  |
Non-current financial assets at fair value through profit or loss |  | 0 |  |  |
Non-current financial assets at fair value through other comprehensive income |  | 0 |  |  |
Non-current financial assets at amortised cost |  | 0 |  |  |
Non-current Derivative assets |  | 36,533 | 10,594 |  |
Other financial assets |  | 0 | 0 |  |
Trade and other receivables |  | 0 | 0 |  |
Total non-current financial assets |  | 36,533 | 10,594 |  |
Total financial assets |  | ₩ 64,704 | ₩ 10,606 |  |
[1] | As of December 31, 2018, the Company invested KRW528,006 million exclusively for payment of decommissioning costs of nuclear power plants.
[2] | Certain financial assets at fair value previously recognized as other financial assets is reclassified to financial assets at fair value through profit or loss upon the adoption of IFRS 9 'Financial Instruments'.

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