Income Tax Benefit (Expense) - Details of Income Tax Benefit (Expense) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Current tax benefit (expense)
Current year	₩ (191,865)	₩ (260,556)	₩ (206,465)
Adjustment for prior years	(32,276)	67,985	59,484
Subtotal	(224,141)	(192,571)	(146,981)
Deferred tax benefit
Changes in temporary differences	6,381	955,283	384,766
Income tax benefit (expense)	₩ (217,760)	₩ 762,712	₩ 237,785

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

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The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period.

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The amount of current tax expense (income) and adjustments for the current tax of prior periods. [Refer: Current tax expense (income); Adjustments for current tax of prior periods]

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The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)]

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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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