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Other Components of Equity - Summary of Other Components of Equity (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Beginning balance ₩ 37,264,750 ₩ 42,000,256 ₩ 65,326,706
Additional paid-in capital and others (1,819) 6,023 126,792
Shares of other comprehensive income of associates and joint ventures, net of tax (6,346) (27,349) 12,305
Shares of other comprehensive income of associates and joint ventures, net of tax 654,225 122,994 509,487
Foreign currency translation of foreign operations, net of tax 164,628 (17,274) 28,387
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax 11,870 (3,654) (24,415)
Others   153  
Ending balance 41,362,833 37,264,750 42,000,256
Other Components Of Equity      
Beginning balance 15,453,203    
Ending balance 15,733,411 15,453,203  
Other capital surplus      
Beginning balance 1,600,801 1,268,569  
Changes in consolidation scope 0 (48)  
Additional paid-in capital and others (7) 0  
Transactions between consolidated entities 18 332,280  
Ending balance 1,600,812 1,600,801 1,268,569
Other capital surplus | Other Components Of Equity      
Beginning balance 1,600,801    
Ending balance 1,600,812 1,600,801  
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 1,213,277 881,045  
Changes in consolidation scope 0 (48)  
Additional paid-in capital and others (7) 0  
Transactions between consolidated entities 18 332,280  
Ending balance 1,213,288 1,213,277 881,045
Accumulated other comprehensive income (loss)      
Beginning balance 557,430 496,976  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax 100,759 (31,665)  
Shares of other comprehensive income of associates and joint ventures, net of tax 654,225 122,994  
Foreign currency translation of foreign operations, net of tax 99,624 (25,950)  
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax 11,976 (5,078)  
Ending balance 1,424,014 557,430 496,976
Accumulated other comprehensive income (loss) | Other Components Of Equity      
Beginning balance 557,430    
Ending balance 1,424,014 557,430  
Financial assets at fair value through other comprehensive income      
Beginning balance (20,002) 11,510  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax 100,759 (31,665)  
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 80,757 (20,002) 11,510
Shares in other comprehensive Income (loss) of investments in associates and joint ventures      
Beginning balance 943,733 820,739  
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 654,225 122,994  
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 1,597,958 943,733 820,739
Reserve for gain (loss) on valuation of derivatives      
Beginning balance (34,731) (29,653)  
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 11,976 (5,078)  
Others   0  
Ending balance (22,755) (34,731) (29,653)
Reserve for overseas operations translation credit      
Beginning balance (331,570) (305,620)  
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 99,624 (25,950)  
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax 0 0  
Others   0  
Ending balance (231,946) (331,570) ₩ (305,620)
Other equity      
Beginning balance 13,294,972    
Ending balance 12,708,585 13,294,972  
Other equity | Other Components Of Equity      
Beginning balance 13,294,972    
Ending balance 12,708,585 13,294,972  
Statutory revaluation reserve      
Beginning balance 13,295,098    
Ending balance 12,708,704 13,295,098  
Changes in other equity      
Beginning balance (126)    
Ending balance ₩ (119) ₩ (126)