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Statements of Appropriation of Retained Earnings (Disposition of Deficit) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Appropriation of Retained Earnings [Line Items]
Unappropriated retained earnings (undisposed deficits) carried over from prior years	₩ 11,921,039
Net income (loss)	3,621,968	₩ (4,716,144)	₩ (24,429,108)
Remeasurement of the defined benefit plan	(296,135)	(271,724)	₩ 663,095
Separate [member]
Statement of Appropriation of Retained Earnings [Line Items]
Unappropriated retained earnings (undisposed deficits) carried over from prior years	0	0
Net income (loss)	829,339	(3,249,233)
Remeasurement of the defined benefit plan	(125,132)	(149,474)
Retained earnings before appropriations	704,207	(3,398,707)
Transfer from voluntary reserves	0	3,398,707
Subtotal (I+II)	704,207	0
Dividends	(136,738)	0
Voluntary reserves	(567,469)	0
Appropriations of retained earnings	(704,207)	0
Unappropriated retained earnings (undisposed deficits) 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 [domain]; 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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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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- Definition

Retained earning appropriated.

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Retained Earnings Unappropriated After Regulatory Reversal Of Loan Losses.

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Statement of Appropriation of Retained Earnings [Line Items]

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Transfer from voluntary reserves.

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