v3.26.1
Intangible Assets - Summary of Intangible Assets (Parenthetical) (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
 [1]
Dec. 31, 2024
 [2]
Dec. 31, 2021
Disclosure of detailed information about intangible assets [line items]      
Impairment loss recognised in profit or loss, intangible assets other than goodwill ₩ (1,934) ₩ (82,743)  
Broadcasting rights [member] | Frequency Usage Rights For 800 MHzB [Member]      
Disclosure of detailed information about intangible assets [line items]      
Impairment loss recognised in profit or loss, intangible assets other than goodwill     ₩ 227,200
Broadcasting rights [member] | Frequency Usage Rights For 1.8 GHz [Member]      
Disclosure of detailed information about intangible assets [line items]      
Impairment loss recognised in profit or loss, intangible assets other than goodwill     547,800
Broadcasting rights [member] | Frequency Usage Rights For 2.1 GHz [Member]      
Disclosure of detailed information about intangible assets [line items]      
Impairment loss recognised in profit or loss, intangible assets other than goodwill     ₩ 411,700
[1] The Group recognized the difference between recoverable amount and the carrying amount of intangible assets amounting to ₩1,934 million as impairment loss for the year ended December 31, 2025.
[2] The Group recognized the difference between recoverable amount and the carrying amount of intangible assets amounting to ₩82,743 million as impairment loss for the year ended December 31, 2024.