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Significant non-cash investing and financing transactions (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Non-Cash Transactions [Abstract] |  |  |
Transfer from construction-in-progress to other assets | ₩ 8,656,252 | ₩ 13,676,233 | ₩ 19,971,599
Recognition of asset retirement cost and related provision for decommissioning costs | 310,272 | 2,494,802 | 470,941
Transfer from provision for disposal of spent nuclear fuel to accrued expenses | ₩ 482,699 | ₩ 342,861 | ₩ 283,675

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- Definition The increase (decrease) in property, plant and equipment resulting from transfers from construction in progress. [Refer: Property, plant and equipment; Construction in progress] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 + Details
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- References No definition available. + Details
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- References No definition available. + Details
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- References No definition available. + Details
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