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Intangible Assets - Summary of Intangible Assets (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Beginning, net ₩ 3,407,124 ₩ 2,632,703  
Changes in accounting policy (26,207)    
Acquisition and capital expenditure 178,694 1,331,172  
Disposal and termination (15,679) (15,417)  
Amortization (660,705) (629,526) ₩ (635,150)
Impairment (61,898) (12,996)  
Inclusion in scope of consolidation   93,719  
Others 12,708 7,468  
Ending, net 2,834,037 3,407,123  
Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 8,064,270 6,714,013  
Ending, net 7,996,482 8,064,270  
Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (4,657,146) (4,081,310)  
Ending, net (5,162,445) (4,657,147)  
Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 236,058 168,880  
Impairment (605) (518)  
Inclusion in scope of consolidation   67,696  
Others 117    
Ending, net 235,570 236,058  
Goodwill [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 542,074 474,908  
Ending, net 541,596 542,074  
Goodwill [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (306,016) (306,028)  
Ending, net (306,026) (306,016)  
Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 335,110 418,559  
Acquisition and capital expenditure 47,903 56,670  
Disposal and termination (3,019) (3,436)  
Amortization (115,839) (147,304)  
Impairment (1,333)    
Others 9,812 10,621  
Ending, net 272,634 335,110  
Development costs [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,680,372 1,643,886  
Ending, net 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 (1,345,262) (1,225,327)  
Ending, net (1,388,738) (1,345,262)  
Software [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 165,944 190,241  
Acquisition and capital expenditure 30,965 29,800  
Disposal and termination (1,267) (736)  
Amortization (68,222) (72,185)  
Impairment (1,807) (222)  
Inclusion in scope of consolidation   2,073  
Others 11,768 16,973  
Ending, net 137,381 165,944  
Software [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 947,312 893,500  
Ending, net 978,139 947,312  
Software [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (781,368) (703,259)  
Ending, net (840,758) (781,368)  
Frequency usage rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 2,156,500 1,364,942  
Acquisition and capital expenditure   1,110,865  
Disposal and termination (284) (558)  
Amortization (399,382) (318,815)  
Impairment (3,035)    
Others 142 66  
Ending, net 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 3,641,231 2,530,341  
Ending, net 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 (1,484,731) (1,165,399)  
Ending, net (1,868,386) (1,484,731)  
Others [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 513,512 490,081  
Changes in accounting policy (26,207)    
Acquisition and capital expenditure 99,826 133,837  
Disposal and termination (11,109) (10,687)  
Amortization (77,262) (91,222)  
Impairment (55,118) (12,256)  
Inclusion in scope of consolidation   23,950  
Others (9,131) (20,192)  
Ending, net 434,511 513,511  
Others [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,253,281 1,171,378  
Ending, net 1,193,048 1,253,281  
Others [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (739,769) (681,297)  
Ending, net ₩ (758,537) ₩ (739,770)