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Investments in Associates and Joint Ventures - Investments in Associates and Joint Ventures Accounted for using the Equity Method (Parenthetical) (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Jul. 27, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of investments in associates and joint ventures [Line Items]        
Purchase of investments in cash   ₩ 11,065 ₩ 222,765 ₩ 170,292
Acquisition and disposition of investments in joint ventures and associates   (362,625) 340,237  
Investments in equity instruments that are not held for trading as financial assets at FVOCI   1,189,597 1,510,428  
Investments in subsidiaries, joint ventures and associates   1,889,289 2,197,351 14,354,113
S.M. Culture & Contents Co., Ltd [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Acquisition and disposition of investments in joint ventures and associates   37 144  
Gains on disposals of investment properties   1,462    
Investments in subsidiaries, joint ventures and associates   59,611 60,261 62,248
Twelve C M Japan Inc and others [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Acquisition and disposition of investments in joint ventures and associates   1,873 7,023  
Investments in subsidiaries, joint ventures and associates   69,734 68,966 64,485
Twelve C M Japan Inc and others [Member] | SMART SKT Infinitum Game Fund [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Contribution in Cash   2,000    
Hana Card Co Ltd [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Acquisition and disposition of investments in joint ventures and associates ₩ 330,032 (368,389)    
Loss on disposal of investments in associates   ₩ 48,693    
Investments in subsidiaries, joint ventures and associates     349,866  
Pacific Telecom Inc [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Percentage of decrease in equity interests   20.00%    
Investments in subsidiaries, joint ventures and associates   ₩ 48,542 43,789 39,723
CMES Inc [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Investments in equity instruments that are not held for trading as financial assets at FVOCI   900    
Investments in subsidiaries, joint ventures and associates   900    
Startup Win Win Fund [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Acquisition and disposition of investments in joint ventures and associates   5,800    
Investments in subsidiaries, joint ventures and associates   4,850    
Daekyo Wipoongdangdang Contents Korea Fund [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Acquisition and disposition of investments in joint ventures and associates   1,080    
Loss on disposal of investments in associates   950    
Investments in subsidiaries, joint ventures and associates   1,080    
KB ESG Fund [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Purchase of investments in cash   4,000    
Finnq Co. Ltd. [member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Acquisition and disposition of investments in joint ventures and associates ₩ 5,733 (3,840)    
Investment in joint ventures and association disposal consideration   5,733    
Loss on disposal of investments in associates   1,043    
Investments in subsidiaries, joint ventures and associates     7,255 ₩ 13,342
UTC Kakao SK Telecom ESG Fund [Member]        
Disclosure of investments in associates and joint ventures [Line Items]        
Acquisition and disposition of investments in joint ventures and associates   4,000 2,000  
Contribution in Cash   4,000    
Investments in subsidiaries, joint ventures and associates   ₩ 5,710 ₩ 2,000