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Deferred Income Tax and Income Tax Expense - Summary of Details of Income Tax Expense (Benefit) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets and liabilities [abstract]
Current income tax expense(benefit)	₩ 268,885	₩ 176,212	₩ (5,003)
Impact of change in deferred taxes	1,771	152,102	232,134
Income tax expense	₩ 270,656	₩ 328,314	₩ 227,131

The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax that relate to continuing operations. [Refer: Continuing operations [member]; Current tax expense (income); Deferred tax expense (income)]

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