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Statements of Appropriation of Retained Earnings (Disposition of Deficit) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement of Appropriation of Retained Earnings [Line Items]      
Undisposed deficit carried over from prior years ₩ 10,370,517    
Net loss (24,429,108) ₩ (5,215,581) ₩ 2,093,683
Remeasurement of the defined benefit plan 663,095 210,409 ₩ (69,804)
Separate [member]      
Statement of Appropriation of Retained Earnings [Line Items]      
Undisposed deficit carried over from prior years 0 0  
Net loss (25,297,713) (5,607,732)  
Remeasurement of the defined benefit plan 327,056 107,884  
Retained earnings before appropriations (24,970,657) (5,499,848)  
Transfer from voluntary reserves 24,970,657 5,499,848  
Subtotal (I+II) 0 0  
Undisposed deficit to be carried over forward to subsequent year ₩ 0 ₩ 0