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Statements of Appropriation of Retained Earnings (Disposition of Deficit) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Appropriation of Retained Earnings [Line Items]
Undisposed deficit carried over from prior years	₩ (7,956,579)
Net loss	(4,716,144)	₩ (24,429,108)	₩ (5,215,581)
Remeasurement of the defined benefit plan	(271,724)	663,095	₩ 210,409
Separate [member]
Statement of Appropriation of Retained Earnings [Line Items]
Undisposed deficit carried over from prior years	0	0
Net loss	(3,249,233)	(25,297,713)
Remeasurement of the defined benefit plan	(149,474)	327,056
Retained earnings before appropriations	(3,398,707)	(24,970,657)
Transfer from voluntary reserves	2,812,314	24,970,657
Subtotal (I+II)	(586,393)	0
Disposition of deficit	586,393	0
Undisposed deficit to be carried over forward to subsequent year	₩ 0	₩ 0

X

- Definition

The amount of other comprehensive income, net of tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [member]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

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- Definition

The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income]

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Retained Earnings Unappropriated After Regulatory Reversal Of Loan Losses.

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