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Other Components Of Equity (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes In Other Components Of Equity [Line Items]    
Beginning balance ₩ 14,240,607 ₩ 14,171,228
Ending balance 14,109,501 14,240,607
Other capital surplus    
Changes In Other Components Of Equity [Line Items]    
Beginning balance 1,226,364 1,234,825
Issuance of share capital of subsidiary (148) 0
Others (2,111) (8,461)
Ending balance 1,224,105 1,226,364
Gains on disposal of Treasury stocks    
Changes In Other Components Of Equity [Line Items]    
Beginning balance 387,524 387,524
Issuance of share capital of subsidiary 0 0
Others 0 0
Ending balance 387,524 387,524
Other Capital Surplus Other Than Gainson Disposal Of Treasury Stocks    
Changes In Other Components Of Equity [Line Items]    
Beginning balance 838,840 847,301
Issuance of share capital of subsidiary (148) 0
Others (2,111) (8,461)
Ending balance 836,581 838,840
Accumulated other comprehensive loss    
Changes In Other Components Of Equity [Line Items]    
Beginning balance (280,730) (358,570)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax (8,533) (10,891)
Shares in other comprehensive loss of associates and joint ventures, net of tax (132,805) 19,343
Foreign currency translation of foreign operations, net of tax (46,032) 55,347
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax 58,523 14,041
Ending balance (409,577) (280,730)
Financial assets at fair value through other comprehensive income    
Changes In Other Components Of Equity [Line Items]    
Beginning balance (92,599) (81,708)
Changes in the unrealized fair value of financial assets at FVOCI, net of tax (8,533) (10,891)
Ending balance (101,132) (92,599)
Shares in other comprehensive Income (loss) of investments in associates and joint ventures    
Changes In Other Components Of Equity [Line Items]    
Beginning balance 142,896 123,553
Shares in other comprehensive loss of associates and joint ventures, net of tax (132,805) 19,343
Ending balance 10,091 142,896
Reserve for overseas operations translation credit    
Changes In Other Components Of Equity [Line Items]    
Beginning balance (294,898) (350,245)
Foreign currency translation of foreign operations, net of tax (46,032) 55,347
Ending balance (340,930) (294,898)
Reserve for gain (loss) on valuation of derivatives    
Changes In Other Components Of Equity [Line Items]    
Beginning balance (36,129) (50,170)
Net change in the unrealized fair value of derivatives using cash flow hedge accounting, net of tax 58,523 14,041
Ending balance 22,394 (36,129)
Other equity    
Changes In Other Components Of Equity [Line Items]    
Beginning balance 13,294,973 13,294,973
Ending balance 13,294,973 13,294,973
Statutory revaluation reserve    
Changes In Other Components Of Equity [Line Items]    
Beginning balance 13,295,098 13,295,098
Ending balance 13,295,098 13,295,098
Changes in other equity    
Changes In Other Components Of Equity [Line Items]    
Beginning balance (125) (125)
Ending balance ₩ (125) ₩ (125)