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Other Components of Equity - Summary of Other Components of Equity (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Beginning balance ₩ 42,000,256 ₩ 65,326,706 ₩ 70,668,059
Additional paid-in capital and others 6,023 126,792 75,211
Shares of other comprehensive income of associates and joint ventures, net of tax (27,349) 12,305 3,609
Shares of other comprehensive income of associates and joint ventures, net of tax 122,994 509,487 301,161
Foreign currency translation of foreign operations, net of tax (17,274) 28,387 41,189
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (3,654) (24,415) (15,778)
Others 153    
Ending balance 37,264,750 42,000,256 65,326,706
Other Components Of Equity      
Beginning balance 15,060,518    
Ending balance 15,453,203 15,060,518  
Other capital surplus      
Beginning balance 1,268,569 1,231,109  
Changes in consolidation scope (48) (597)  
Additional paid-in capital and others 0 39,641  
Transactions between consolidated entities 332,280 (1,584)  
Ending balance 1,600,801 1,268,569 1,231,109
Other capital surplus | Other Components Of Equity      
Beginning balance 1,268,569    
Ending balance 1,600,801 1,268,569  
Gains on disposal of Treasury stocks      
Beginning balance 387,524 387,524  
Changes in consolidation scope 0 0  
Additional paid-in capital and others 0 0  
Transactions between consolidated entities 0 0  
Ending balance 387,524 387,524 387,524
Other Capital Surplus Other Than Gainson Disposal Of Treasury Stocks      
Beginning balance 881,045 843,585  
Changes in consolidation scope (48) (597)  
Additional paid-in capital and others 0 39,641  
Transactions between consolidated entities 332,280 (1,584)  
Ending balance 1,213,277 881,045 843,585
Accumulated other comprehensive income (loss)      
Beginning balance 496,976 (57,632)  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax (31,665) 58,008  
Shares of other comprehensive income of associates and joint ventures, net of tax 122,994 509,487  
Foreign currency translation of foreign operations, net of tax (25,950) 19,550  
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (5,078) (32,437)  
Ending balance 557,430 496,976 (57,632)
Accumulated other comprehensive income (loss) | Other Components Of Equity      
Beginning balance 496,976    
Ending balance 557,430 496,976  
Financial assets at fair value through other comprehensive income      
Beginning balance 11,510 (46,498)  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax (31,665) 58,008  
Shares of other comprehensive income of associates and joint ventures, net of tax 0 0  
Foreign currency translation of foreign operations, net of tax 0 0  
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax 0 0  
Others 153    
Ending balance (20,002) 11,510 (46,498)
Shares in other comprehensive Income (loss) of investments in associates and joint ventures      
Beginning balance 820,739 311,252  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax 0 0  
Shares of other comprehensive income of associates and joint ventures, net of tax 122,994 509,487  
Foreign currency translation of foreign operations, net of tax 0 0  
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax 0 0  
Others 0    
Ending balance 943,733 820,739 311,252
Reserve for gain (loss) on valuation of derivatives      
Beginning balance (29,653) 2,784  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax 0 0  
Shares of other comprehensive income of associates and joint ventures, net of tax 0 0  
Foreign currency translation of foreign operations, net of tax 0 0  
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (5,078) (32,437)  
Others 0    
Ending balance (34,731) (29,653) 2,784
Reserve for overseas operations translation credit      
Beginning balance (305,620) (325,170)  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax 0 0  
Shares of other comprehensive income of associates and joint ventures, net of tax 0 0  
Foreign currency translation of foreign operations, net of tax (25,950) 19,550  
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax 0 0  
Others 0    
Ending balance (331,570) (305,620) ₩ (325,170)
Other equity      
Beginning balance 13,294,973    
Ending balance 13,294,972 13,294,973  
Other equity | Other Components Of Equity      
Beginning balance 13,294,973    
Ending balance 13,294,972 13,294,973  
Statutory revaluation reserve      
Beginning balance 13,295,098    
Ending balance 13,295,098 13,295,098  
Changes in other equity      
Beginning balance (125)    
Ending balance ₩ (126) ₩ (125)