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Deferred Income Tax and Income Tax Expense - Summary of Details of Income Tax Expense (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets and liabilities [abstract]
Current income tax expense	₩ 213,225	₩ 120,533	₩ 329,581
Impact of change in deferred taxes	72,124	199,527	(15,016)
Income tax expense	₩ 285,349	₩ 320,060	₩ 314,565

- Definition

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

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