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Employment Benefits - Summary of the Fair Value of Plan Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value of plan assets [abstract]    
Equity instruments ₩ 344,002 ₩ 253,358
Debt instruments 744,167 822,582
Bank deposits 407,809 284,655
Others 1,413,569 1,310,237
Plan assets ₩ 2,909,547 ₩ 2,670,832