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Retained Earnings and Dividends Paid - Summary of Changes in Retained Earnings (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Beginning balance ₩ 45,258,244    
Loss for the year attributed to owners of the controlling company (24,466,853) ₩ (5,304,522) ₩ 1,992,077
Changes in equity method retained earnings      
Changes 1,310,391 494,584 281,107
Remeasurements of defined benefit liability, net of tax 663,095 210,409 (69,804)
Additional paid-in capital and others 126,792 75,211 (5,445)
Ending balance 21,431,300 45,258,244  
Equity attributable to owners of parent [member]      
Changes in equity method retained earnings      
Additional paid-in capital and others 40,476 (491) (148)
Retained earnings [member]      
Beginning balance 45,258,244 51,134,330  
Loss for the year attributed to owners of the controlling company (24,466,853) (5,304,522)  
Changes in equity method retained earnings      
Beginning balance 3,970 361  
Changes 12,305 3,609  
Ending balance 16,275 3,970 361
Remeasurements of defined benefit liability, net of tax 626,769 201,067  
Transfer of gain or loss on valuation of financial assets at FVOCI 0 4,388  
Dividend paid 0 (780,628)  
Additional paid-in capital and others 835 0 0
Ending balance ₩ 21,431,300 ₩ 45,258,244 ₩ 51,134,330