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Retained Earnings and Dividends Paid - Summary of Changes in Retained Earnings (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Beginning balance | ₩ 21,431,300 |  |
Loss for the year attributed to owners of the controlling company | (4,822,549) | ₩ (24,466,853) | ₩ (5,304,522)
Changes in equity method retained earnings |  |  |
Changes | (595,056) | (1,338,293) |
Remeasurements of defined benefit liability, net of tax | (271,724) | 663,095 | 210,409
Additional paid-in capital and others | 6,023 | 126,792 | 75,211
Ending balance | 16,338,262 | 21,431,300 |
Retained earnings [member] |  |  |
Beginning balance | 21,431,300 | 45,258,244 |
Loss for the year attributed to owners of the controlling company | (4,822,549) | (24,466,853) |
Changes in equity method retained earnings |  |  |
Beginning balance | 16,275 | 3,970 |
Changes | (27,349) | 12,305 |
Ending balance | (11,074) | 16,275 | 3,970
Remeasurements of defined benefit liability, net of tax | (242,987) | 626,769 | 201,067
Others | (153) | 0 |
Additional paid-in capital and others | 0 | 835 | 0
Ending balance | ₩ 16,338,262 | ₩ 21,431,300 | ₩ 45,258,244

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