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Income Taxes - Summary of Reconciliation Between Actual Income Tax Expense and Amount Computed by Applying the Statutory Tax Rate (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]      
Profit (loss) before income tax (previously stated) ₩ (33,843,619) ₩ (7,071,570) ₩ 2,991,533
Income tax expense (benefit) computed at applicable tax rate [1] (9,306,995) (1,944,682) 822,672
Adjustments (155,890) (64,420) 140,148
Effect of applying gradual tax rate (10,362) (10,362) (10,362)
Effect of non-taxable income (9,471) (4,983) (13,593)
Effect of non-deductible expenses 39,663 78,814 46,776
Effect of tax losses that are not recognized as deferred tax asset 19,275 1,351 0
Effects of tax credits and deduction (98,684) (43,931) (63,753)
Reversal of unrecognized deferred tax asset, net (38,708) (43,641) (10,471)
Effect of change in deferred tax due to change in tax rate 393,416 18,931 (17,590)
Deduction of deferred tax assets (85,514) 73,887 55,682
Deferred tax related to investments in subsidiaries, associates and joint ventures (375,064) (135,878) 102,137
Others, net 9,559 1,392 51,322
Adjustment in respect of prior years due to change in estimate 48,374 153,113 (63,756)
Income tax expense (benefit) ₩ (9,414,511) ₩ (1,855,989) ₩ 899,064
Effective tax rate [2] [2] 30.05%
[1] Applicable tax rate is 27.5% as of December 31, 2020, 2021 and 2022.
[2] The effective tax rate for the year ended December 31, 2020 is
30.05
% and the effective tax rate for the years ended December 31, 2021 and 2022 is not calculated due to income tax benefit.