v3.26.1
Intangible Assets - Summary of Intangible Assets (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about intangible assets [line items]      
Intangible assets ₩ 1,710,620 ₩ 2,194,871 ₩ 2,861,137
Acquisition cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 8,940,701 9,509,515  
Accumulated amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (7,209,150) (7,211,252)  
Accumulated impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (20,931) (103,392)  
Frequency usage rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 664,486 [1] 1,135,546 [1] 1,606,606
Frequency usage rights [member] | Acquisition cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets [1] 3,564,907 3,564,907  
Frequency usage rights [member] | Accumulated amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets [1] (2,900,421) (2,429,361)  
Land usage rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 249 309 587
Land usage rights [member] | Acquisition cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 41,193 54,341  
Land usage rights [member] | Accumulated amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (40,944) (54,032)  
Industrial rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 19,570 20,173 46,154
Industrial rights [member] | Acquisition cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 57,239 98,265  
Industrial rights [member] | Accumulated amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (37,669) (33,092)  
Industrial rights [member] | Accumulated impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets   (45,000)  
Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 8 27 49
Development costs [member] | Acquisition cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 1,914 2,960  
Development costs [member] | Accumulated amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (1,906) (2,933)  
Facility usage rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 11,720 13,314 14,313
Facility usage rights [member] | Acquisition cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 162,391 161,561  
Facility usage rights [member] | Accumulated amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (150,671) (148,247)  
Customer relations [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 219,094 246,119 273,150
Customer relations [member] | Acquisition cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 501,103 505,062  
Customer relations [member] | Accumulated amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets (282,009) (258,943)  
Club memberships [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 77,461 [2] 78,618 [2] 97,186
Club memberships [Member] | Acquisition cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets [2] 91,787 93,266  
Club memberships [Member] | Accumulated impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets [2] (14,326) (14,648)  
Other [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets 718,032 [3] 700,765 [3] ₩ 823,092
Other [member] | Acquisition cost [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets [3] 4,520,167 5,029,153  
Other [member] | Accumulated amortization [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets [3] (3,795,530) (4,284,644)  
Other [member] | Accumulated impairment [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets [3] ₩ (6,605) ₩ (43,744)  
[1] The Parent Company was reassigned 800 MHz, 1.8 GHz and 2.1 GHz band of frequency licenses from the Ministry of Science and Information and Communication Technology (“ICT”) in exchange for ₩227,200 million, ₩547,800 million and ₩411,700 million, respectively, for the year ended December 31, 2021. The band of frequency was assigned to the Parent Company at the date of initial lump sum payment for the year ended December 31, 2021 and the annual payments in installment for the remaining balances are made in the next five years starting from the date of initial lump sum payment.
[2] Club memberships are classified as intangible assets with indefinite useful lives and are not amortized.
[3] Other intangible assets primarily consist of computer software and others.