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Contract Assets and Liabilities - Summary of Contract Assets and Liabilities (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of revenue from contracts with customers [line items]    
Contract liabilities ₩ 233,922 ₩ 202,967
Allocation of consideration between performance obligations [member]    
Disclosure of revenue from contracts with customers [line items]    
Contract assets 132,221 118,278
Wireless service contracts [member]    
Disclosure of revenue from contracts with customers [line items]    
Contract liabilities 18,544 18,397
Customer loyalty programs [member]    
Disclosure of revenue from contracts with customers [line items]    
Contract liabilities 7,706 12,699
Fixed-line service contracts [member]    
Disclosure of revenue from contracts with customers [line items]    
Contract liabilities 136,880 118,525
Other contract liabilities [member]    
Disclosure of revenue from contracts with customers [line items]    
Contract liabilities ₩ 70,792 ₩ 53,346