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Intangible Assets - Summary of Intangible Assets (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]      
Beginning, net ₩ 2,632,704 ₩ 3,022,803  
Acquisition and capital expenditure 1,331,172 386,711  
Disposal and termination (15,417) (27,213)  
Amortization (629,526) (635,150) ₩ (599,721)
Impairment (12,996) (116,095)  
Inclusion in scope of consolidation 93,719    
Exclusion in scope of consolidation   (4,922)  
Others 7,468 6,570  
Ending, net 3,407,123 2,632,704 3,022,803
Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 6,714,014 6,500,489  
Ending, net 8,064,270 6,714,014 6,500,489
Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (4,081,310) (3,477,686)  
Ending, net (4,657,147) (4,081,310) (3,477,686)
Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 168,880 253,486  
Impairment (518) (84,606)  
Inclusion in scope of consolidation 67,696    
Ending, net 236,058 168,880 253,486
Goodwill [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 474,908 492,105  
Ending, net 542,074 474,908 492,105
Goodwill [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (306,028) (238,619)  
Ending, net (306,016) (306,028) (238,619)
Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 418,559 334,676  
Acquisition and capital expenditure 56,670 247,863  
Disposal and termination (3,436) (14,806)  
Amortization (147,304) (151,718)  
Exclusion in scope of consolidation   (332)  
Others 10,621 2,876  
Ending, net 335,110 418,559 334,676
Development costs [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,643,886 1,483,205  
Ending, net 1,680,372 1,643,886 1,483,205
Development costs [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (1,225,327) (1,148,529)  
Ending, net (1,345,262) (1,225,327) (1,148,529)
Software [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 190,241 197,138  
Acquisition and capital expenditure 29,800 60,475  
Disposal and termination (736) (548)  
Amortization (72,185) (73,174)  
Impairment (222) (3)  
Inclusion in scope of consolidation 2,073    
Exclusion in scope of consolidation   (3,216)  
Others 16,973 9,569  
Ending, net 165,944 190,241 197,138
Software [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 893,500 838,532  
Ending, net 947,312 893,500 838,532
Software [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (703,259) (641,394)  
Ending, net (781,368) (703,259) (641,394)
Frequency usage rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,364,942 1,677,289  
Acquisition and capital expenditure 1,110,865    
Disposal and termination (558)    
Amortization (318,815) (311,146)  
Others 66 (1,201)  
Ending, net 2,156,500 1,364,942 1,677,289
Frequency usage rights [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 2,530,341 2,531,654  
Ending, net 3,641,231 2,530,341 2,531,654
Frequency usage rights [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (1,165,399) (854,365)  
Ending, net (1,484,731) (1,165,399) (854,365)
Others [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 490,081 560,214  
Acquisition and capital expenditure 133,837 78,373  
Disposal and termination (10,687) (11,859)  
Amortization (91,222) (99,112)  
Impairment (12,256) (31,486)  
Inclusion in scope of consolidation 23,950    
Exclusion in scope of consolidation   (1,374)  
Others (20,192) (4,674)  
Ending, net 513,511 490,081 560,214
Others [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,171,378 1,154,993  
Ending, net 1,253,281 1,171,378 1,154,993
Others [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (681,297) (594,779)  
Ending, net ₩ (739,770) ₩ (681,297) ₩ (594,779)