Income Taxes - Summary of Deferred Income Tax Assets (Liabilities) (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets and liabilities [abstract]
Deferred tax assets	₩ 1,901,992	₩ 1,733,146
Deferred tax liabilities	(7,100,938)	(9,100,247)
Net Deferred tax assets(liabilities)	₩ (5,198,946)	₩ (7,367,101)	₩ (7,126,946)

The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

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