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Intangible Assets - Summary of Intangible Assets (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]      
Beginning, net ₩ 2,834,037 ₩ 3,407,124  
Changes in accounting policy   (26,207)  
Acquisition and capital expenditure 165,630 178,694  
Disposal and termination (13,820) (15,679)  
Amortization (628,154) (660,705) ₩ (629,526)
Impairment (211,637) (61,898)  
Changes in scope of consolidation 4,342    
Others 10,860 12,708  
Ending, net 2,161,258 2,834,037 3,407,124
Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 7,996,482 8,064,270  
Ending, net 7,898,325 7,996,482 8,064,270
Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (5,162,445) (4,657,146)  
Ending, net (5,737,067) (5,162,445) (4,657,146)
Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 235,570 236,058  
Impairment   (605)  
Others (5,485) 117  
Ending, net 230,085 235,570 236,058
Goodwill [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 541,596 542,074  
Ending, net 536,093 541,596 542,074
Goodwill [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (306,026) (306,016)  
Ending, net (306,008) (306,026) (306,016)
Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 272,634 335,110  
Acquisition and capital expenditure 26,990 47,903  
Disposal and termination (1,849) (3,019)  
Amortization (104,938) (115,839)  
Impairment   (1,333)  
Changes in scope of consolidation 575    
Others 87,587 9,812  
Ending, net 280,999 272,634 335,110
Development costs [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,661,372 1,680,372  
Ending, net 1,767,422 1,661,372 1,680,372
Development costs [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (1,388,738) (1,345,262)  
Ending, net (1,486,423) (1,388,738) (1,345,262)
Software [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 137,381 65,944  
Acquisition and capital expenditure 37,077 30,965  
Disposal and termination (105) (1,267)  
Amortization (54,191) (68,222)  
Impairment (1,776) (1,807)  
Changes in scope of consolidation 77    
Others 27,537 11,768  
Ending, net 146,000 137,381 65,944
Software [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 978,139 947,312  
Ending, net 1,053,980 978,139 947,312
Software [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (840,758) (781,368)  
Ending, net (907,980) (840,758) (781,368)
Frequency usage rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,753,941 2,156,500  
Disposal and termination 0 (284)  
Amortization (399,348) (399,382)  
Impairment (193,194) (3,035)  
Others (736) 142  
Ending, net 1,160,663 1,753,941 2,156,500
Frequency usage rights [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 3,622,327 3,641,231  
Ending, net 3,373,095 3,622,327 3,641,231
Frequency usage rights [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (1,868,386) (1,484,731)  
Ending, net (2,212,432) (1,868,386) (1,484,731)
Others [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 434,511 513,512  
Changes in accounting policy   (26,207)  
Acquisition and capital expenditure 101,563 99,826  
Disposal and termination (11,866) (11,109)  
Amortization (69,677) (77,262)  
Impairment (16,667) (55,118)  
Changes in scope of consolidation 3,690    
Others (98,043) (9,131)  
Ending, net 343,511 434,511 513,512
Others [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,193,048 1,253,281  
Ending, net 1,167,735 1,193,048 1,253,281
Others [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (758,537) (739,769)  
Ending, net ₩ (824,224) ₩ (758,537) ₩ (739,769)