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Other Components of Equity - Summary of Other Components of Equity (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Beginning balance ₩ 70,666,846 ₩ 68,889,649 ₩ 71,092,762
Issuance of share capital of subsidiary 75,211 (5,445) 21,071
Others (34,747) (1,274) (8,137)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax 59,024 (8,532) (11,732)
Shares in other comprehensive Income(loss) of associates and joint ventures, net of tax 3,609 3,181 (6,789)
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax 301,161 (132,805) 19,344
Foreign currency translation of foreign operations, net of tax 41,189 (76,442) 72,816
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (15,778) 64,561 19,242
Ending balance 65,311,849 70,666,846 68,889,649
Other Components Of Equity      
Beginning balance 14,109,501    
Ending balance 14,468,450 14,109,501  
Other capital surplus      
Beginning balance 1,224,105 1,226,364  
Changes in consolidation scope 43 0  
Issuance of share capital of subsidiary (491) (148)  
Others 7,452 (2,111)  
Ending balance 1,231,109 1,224,105 1,226,364
Other capital surplus | Other Components Of Equity      
Beginning balance 1,224,105    
Ending balance 1,231,109 1,224,105  
Gains on disposal of Treasury stocks      
Beginning balance 387,524 387,524  
Changes in consolidation scope 0 0  
Issuance of share capital of subsidiary 0 0  
Others 0 0  
Ending balance 387,524 387,524 387,524
Other Capital Surplus Other Than Gainson Disposal Of Treasury Stocks      
Beginning balance 836,581 838,840  
Changes in consolidation scope 43 0  
Issuance of share capital of subsidiary (491) (148)  
Others 7,452 (2,111)  
Ending balance 843,585 836,581 838,840
Accumulated other comprehensive loss      
Beginning balance (409,577) (280,730)  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax 59,022 (8,533)  
Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax 301,161 (132,805)  
Foreign currency translation of foreign operations, net of tax 15,760 (46,032)  
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax (19,610) 58,523  
Others (4,388)    
Ending balance (57,632) (409,577) (280,730)
Accumulated other comprehensive loss | Other Components Of Equity      
Beginning balance (409,577)    
Ending balance (57,632) (409,577)  
Financial assets at fair value through other comprehensive income      
Beginning balance (101,132) (92,599)  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax 59,022 (8,533)  
Shares in other comprehensive Income(loss) 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 (4,388)    
Ending balance (46,498) (101,132) (92,599)
Shares in other comprehensive Income (loss) of investments in associates and joint ventures      
Beginning balance 10,091 142,896  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax 0 0  
Shares in other comprehensive Income(loss) of associates and joint ventures, net of tax 301,161 (132,805)  
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 311,252 10,091 142,896
Reserve for gain (loss) on valuation of derivatives      
Beginning balance 22,394 (36,129)  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax 0 0  
Shares in other comprehensive Income(loss) 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 (19,610) 58,523  
Others 0    
Ending balance 2,784 22,394 (36,129)
Reserve for overseas operations translation credit      
Beginning balance (340,930) (294,898)  
Changes in the unrealized fair value of financial assets at FVOCI, net of tax 0 0  
Shares in other comprehensive Income(loss) of associates and joint ventures, net of tax 0 0  
Foreign currency translation of foreign operations, net of tax 15,760 (46,032)  
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax 0 0  
Others 0    
Ending balance (325,170) (340,930) ₩ (294,898)
Other equity      
Beginning balance 13,294,973    
Ending balance 13,294,973 13,294,973  
Other equity | Other Components Of Equity      
Beginning balance 13,294,973    
Ending balance 13,294,973 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 ₩ (125) ₩ (125)