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Employment Benefits - Summary of Remeasurement Components Recognized in Other Comprehensive Income (loss) (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Changes in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income [abstract]    
Actuarial gain from changes in financial assumptions ₩ (258,194) ₩ (2,979)
Experience adjustments (87,561) 87,364
Expected return 8,457 390
Total loss (gain) on remeasurement, net defined benefit liability (asset) ₩ (337,298) ₩ 84,775