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Income Taxes - Summary of Reconciliation Between Actual Income Tax Expense (Benefit) and Amount Computed by Applying the Statutory Tax Rate (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |
Profit (loss) before income tax |  | ₩ 5,256,529 | ₩ (7,553,977) | ₩ (33,843,619)
Income tax expense (benefit) computed at applicable tax rate | [1] | 1,363,018 | (1,936,840) | (9,306,995)
Effect of applying gradual tax rate |  | (10,362) | (10,362) | (10,362)
Effect of non-taxable income |  | (86,442) | (26,993) | (9,471)
Effect of non-deductible expenses |  | 28,712 | 39,411 | 39,663
Effect of tax losses that are not recognized as deferred tax assets |  | (797) | 0 | 19,275
Effects of tax credits and deduction |  | (54,364) | (53,724) | (98,684)
Effect of change in deferred tax due to change in tax rate |  | (11,985) | 211,736 | 393,416
Reversal of unrecognized deferred tax assets, net |  | (7,740) | (15,244) | (38,708)
Deduction of deferred tax assets |  | 0 | 29,095 | (85,514)
Deferred tax related to investments in subsidiaries, associates and joint ventures |  | 447,833 | (1,063,007) | (375,064)
Others, net |  | 11,580 | 20,195 | 9,559
Adjustments |  | 316,435 | (868,893) | (155,890)
Adjustment in respect of prior years due to change in estimate |  | (44,892) | (32,100) | 48,374
Income tax expense (benefit) |  | ₩ 1,634,561 | ₩ (2,837,833) | ₩ (9,414,511)
[1] | Applicable tax rates are 26.5%, 25.64% and 25.93% as of December 31, 2022, 2023 and 2024, respectively.

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