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Intangible Assets - Summary of Intangible Assets (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about intangible assets [line items]      
Beginning, net ₩ 3,129,833 ₩ 3,447,333  
Acquisition and capital expenditure 309,737 346,989  
Disposal and termination (11,640) (25,668)  
Amortization (691,909) (627,261) ₩ (604,744)
Impairment (236,207) (30,674)  
Acquisition and disposition of businesses 6,030 (10,266)  
Others 28,017 29,380  
Ending, net 2,533,861 3,129,833 3,447,333
Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 8,148,293 7,942,556  
Ending, net 8,163,459 8,148,293 7,942,556
Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (5,018,460) (4,495,223)  
Ending, net (5,629,598) (5,018,460) (4,495,223)
Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 708,223 696,872  
Acquisition and capital expenditure   19,455  
Impairment (230,352) (24,006)  
Acquisition and disposition of businesses 6,207 0  
Others 4,349 15,902  
Ending, net 488,427 708,223 696,872
Goodwill [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,037,887 1,002,530  
Ending, net 1,036,354 1,037,887 1,002,530
Goodwill [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (329,664) (305,658)  
Ending, net (547,927) (329,664) (305,658)
Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 171,856 228,373  
Acquisition and capital expenditure 33,078 45,997  
Disposal and termination (4,812) (5,503)  
Amortization (63,052) (93,374)  
Impairment (128) (744)  
Acquisition and disposition of businesses   (2,320)  
Others 1,658 (573)  
Ending, net 138,600 171,856 228,373
Development costs [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,803,687 1,812,377  
Ending, net 1,790,446 1,803,687 1,812,377
Development costs [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (1,631,831) (1,584,004)  
Ending, net (1,651,846) (1,631,831) (1,584,004)
Software [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 155,076 139,425  
Acquisition and capital expenditure 38,603 55,651  
Disposal and termination (397) (48)  
Amortization (52,265) (54,748)  
Impairment (16) (508)  
Acquisition and disposition of businesses (108) (802)  
Others 11,769 16,106  
Ending, net 152,662 155,076 139,425
Software [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,156,951 1,083,426  
Ending, net 1,196,329 1,156,951 1,083,426
Software [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (1,001,875) (944,001)  
Ending, net (1,043,667) (1,001,875) (944,001)
Frequency usage rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,488,256 1,839,131  
Acquisition and capital expenditure 37    
Amortization (350,276) (350,265)  
Others 175 (610)  
Ending, net 1,138,192 1,488,256 1,839,131
Frequency usage rights [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 2,617,707 2,617,647  
Ending, net 2,415,243 2,617,707 2,617,647
Frequency usage rights [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (1,129,451) (778,516)  
Ending, net (1,277,051) (1,129,451) (778,516)
Others [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 606,422 543,532  
Acquisition and capital expenditure 238,019 225,886  
Disposal and termination (6,431) (20,117)  
Amortization (226,316) (128,874)  
Impairment (5,711) (5,416)  
Acquisition and disposition of businesses (69) (7,144)  
Others 10,066 (1,445)  
Ending, net 615,980 606,422 543,532
Others [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,532,061 1,426,576  
Ending, net 1,725,087 1,532,061 1,426,576
Others [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (925,639) (883,044)  
Ending, net ₩ (1,109,107) ₩ (925,639) ₩ (883,044)