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Retained Earnings and Dividends Paid - Summary of Retained Earnings (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Retained earnings [abstract] |  |
Legal reserves | ₩ 1,604,910 | ₩ 1,604,910
Voluntary reserves |  |
Reserve for investment on social overhead capital | 5,277,449 | 5,277,449
Reserve for research and human development | 330,000 | 330,000
Reserve for business expansion | 27,465,368 | 26,361,617
Reserve for equalizing dividends | 210,000 | 210,000
Voluntary reserves | 33,282,817 | 32,179,066
Retained earnings before appropriations | 10,359,255 | 17,349,625
Retained earnings | ₩ 45,246,982 | ₩ 51,133,601

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