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Income Taxes - Summary of Income Tax Expense (Benefit) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income tax expense (benefit) [Abstract]
Payment of income tax	₩ 357,767	₩ 671,179	₩ 538,223
Adjustment in respect of prior years due to change in estimate	153,113	(63,756)	(176,441)
Current income tax directly recognized in equity	(198,714)	51,486	(53,302)
Current income tax expense	312,166	658,909	308,480
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods	(2,168,155)	240,155	(1,310,783)
Generation and realization of temporary differences	(489,411)	(77,985)	(636,984)
Changes of unrecognized tax losses, tax credit and temporary differences for prior periods	(43,653)	(10,471)	(22,469)
Changes in deferred tax on tax losses carryforwards	(1,641,823)	296,070	(582,011)
Tax credit carryforwards	(12,199)	32,541	(71,306)
Amount due to change in tax rate or regulations	18,931	0	1,987
Income tax expense (benefit)	(1,855,989)	899,064	(1,002,303)
Dividends of hybrid bond and others	4,736	4,273	3,432
Income tax recognized as other comprehensive income (loss)	(203,450)	47,213	(56,733)
Gain(loss) on valuation of financial assets at fair value through other comprehensive income	(9,753)	19,447	(4,217)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax	24,220	(47,231)	(15,642)
Remeasurements of defined benefit liability	(126,890)	14,971	(40,235)
Investments in associates	(53,672)	35,714	4,275
Others	₩ (37,355)	₩ 24,312	₩ (914)

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Adjustments of tax expense (income) recognised in the period for current tax of prior periods.

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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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The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]]

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The amount of income tax relating to an entity's share of other comprehensive income of associates and joint ventures accounted for using the equity method. [Refer: Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax]

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