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Intangible Assets - Summary of Goodwill Allocated to Each Cash-Generation Unit (Parenthetical) (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]      
Goodwill ₩ 708,223    
Mobile services [member] | ICT [member]      
Disclosure of detailed information about intangible assets [line items]      
Terminal growth rate 0.00%    
Discount rate 8.48%    
Impairment loss on goodwill ₩ 0 ₩ 0 ₩ 0
Mobile services [member] | Bottom of range [member] | ICT [member]      
Disclosure of detailed information about intangible assets [line items]      
Expected revenue growth rate 1.13%    
Mobile services [member] | Top of range [member] | ICT [member]      
Disclosure of detailed information about intangible assets [line items]      
Expected revenue growth rate 4.31%    
Marketing [member] | Mobile services [member]      
Disclosure of detailed information about intangible assets [line items]      
Terminal growth rate 0.00%    
Expected revenue growth rate 1.13%    
Discount rate 8.48%    
Impairment loss on goodwill ₩ 0 0 0
Finance [member]      
Disclosure of detailed information about intangible assets [line items]      
Description of calculation of recoverable amount The recoverable amounts of BC Card Co., Ltd. are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate 1.57% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 5.32% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on BC Card Co., Ltd. for the years ended December 31, 2020, 2021 and 2022.     
Finance [member] | BC Card Co., Ltd. [member]      
Disclosure of detailed information about intangible assets [line items]      
Terminal growth rate 0.00%    
Expected revenue growth rate 1.57%    
Discount rate 5.32%    
Impairment loss on goodwill ₩ 0 0 0
Goodwill 41,234    
Others [member] | HCN Co Ltd [Member]      
Disclosure of detailed information about intangible assets [line items]      
Impairment loss on goodwill 24,006    
Goodwill ₩ 228,674    
Others [member] | BOOK CLUB MILLIE [Member]      
Disclosure of detailed information about intangible assets [line items]      
Terminal growth rate 1.00%    
Expected revenue growth rate 27.83%    
Discount rate 18.75%    
Impairment loss on goodwill ₩ 0    
Others [member] | Epsilon Global Communications [Member]      
Disclosure of detailed information about intangible assets [line items]      
Terminal growth rate 1.00%    
Expected revenue growth rate 12.10%    
Discount rate 9.74%    
Impairment loss on goodwill ₩ 0    
Others [member] | MEDIA GENIE Co Ltd [Member]      
Disclosure of detailed information about intangible assets [line items]      
Description of calculation of recoverable amount The recoverable amounts of GENIE Music Corporation are calculated based on value-in use calculations. These calculations use discounted cash flow projections for the next five years based on financial budgets. A terminal growth rate of 0.0% was applied for the cash flows expected to be incurred after five years. This growth rate does not exceed the average growth rate of the industry which the cash-generating unit belongs in. The Group estimated its revenue growth rate (-)0.41% based on past performance and its expectation of future market changes. In addition, management estimated the cash flow based on past performance and its expectation of market growth, and the discount rates 15.72% used reflected specific risks relating to the relevant CGU. As a result of the impairment test, the Group concluded that the carrying amount of CGU does not exceed the recoverable amount. Accordingly, the Group did not recognize an impairment loss on goodwill on GENIE Music Corporation for the years ended December 31, 2022.    
Others [member] | KT Telecop Co., Ltd. [member]      
Disclosure of detailed information about intangible assets [line items]      
Terminal growth rate 1.00%    
Expected revenue growth rate 3.05%    
Discount rate 10.23%    
Impairment loss on goodwill ₩ 0 ₩ 0 ₩ 0
Goodwill ₩ 15,418    
Others [member] | GENIE Music Corporation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Terminal growth rate 0.00%    
Expected revenue growth rate 0.41%    
Discount rate 15.72%    
Impairment loss on goodwill ₩ 0    
Goodwill ₩ 50,214    
Others [member] | PlayD Co., Ltd. [Member]      
Disclosure of detailed information about intangible assets [line items]      
Terminal growth rate 1.00%    
Expected revenue growth rate 9.16%    
Discount rate 15.30%    
Impairment loss on goodwill ₩ 0    
Goodwill ₩ 42,745    
Satellite TV [member] | HCN Co Ltd [Member]      
Disclosure of detailed information about intangible assets [line items]      
Terminal growth rate 0.00%    
Expected revenue growth rate 6.60%    
Discount rate 10.14%