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Intangible Assets - Summary of Intangible Assets (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about intangible assets [line items]      
Beginning, net ₩ 3,022,803 ₩ 2,599,751  
Acquisition and capital expenditure 386,711 1,124,327  
Disposal and termination (27,213) (26,925)  
Amortization (635,150) (599,721) ₩ (609,185)
Impairment (116,095) (135,264)  
Inclusion in scope of consolidation (4,922) 61,222  
Others 6,570 (587)  
Ending, net 2,632,704 3,022,803 2,599,751
Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 6,500,489 6,442,500  
Ending, net 6,714,014 6,500,489 6,442,500
Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (3,477,686) (3,842,749)  
Ending, net (4,081,310) (3,477,686) (3,842,749)
Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 253,486 342,341  
Impairment (84,606) (131,600)  
Inclusion in scope of consolidation   42,745  
Ending, net 168,880 253,486 342,341
Goodwill [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 492,105 449,379  
Ending, net 474,908 492,105 449,379
Goodwill [member] | Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (238,619) (107,038)  
Ending, net (306,028) (238,619) (107,038)
Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 334,676 461,543  
Acquisition and capital expenditure 247,863 36,075  
Disposal and termination (14,806) (8,600)  
Amortization (151,718) (162,682)  
Inclusion in scope of consolidation (332)    
Others 2,876 8,340  
Ending, net 418,559 334,676 461,543
Development costs [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,483,205 1,487,420  
Ending, net 1,643,886 1,483,205 1,487,420
Development costs [member] | Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (1,148,529) (1,025,877)  
Ending, net (1,225,327) (1,148,529) (1,025,877)
Software [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 197,138 231,384  
Acquisition and capital expenditure 60,475 35,631  
Disposal and termination (548) (1,928)  
Amortization (73,174) (78,643)  
Impairment (3) (46)  
Inclusion in scope of consolidation (3,216) 2,462  
Others 9,569 8,278  
Ending, net 190,241 197,138 231,384
Software [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 838,532 805,387  
Ending, net 893,500 838,532 805,387
Software [member] | Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (641,394) (574,003)  
Ending, net (703,259) (641,394) (574,003)
Frequency usage rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,677,289 972,770  
Acquisition and capital expenditure   978,309  
Amortization (311,146) (273,790)  
Others (1,201)    
Ending, net 1,364,942 1,677,289 972,770
Frequency usage rights [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 2,531,654 2,591,229  
Ending, net 2,530,341 2,531,654 2,591,229
Frequency usage rights [member] | Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (854,365) (1,618,459)  
Ending, net (1,165,399) (854,365) (1,618,459)
Others [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 560,214 591,713  
Acquisition and capital expenditure 78,373 74,312  
Disposal and termination (11,859) (16,397)  
Amortization (99,112) (84,606)  
Impairment (31,486) (3,618)  
Inclusion in scope of consolidation (1,374) 16,015  
Others (4,674) (17,205)  
Ending, net 490,081 560,214 591,713
Others [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,154,993 1,109,085  
Ending, net 1,171,378 1,154,993 1,109,085
Others [member] | Accumulated Depreciation and Amortisation [Member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (594,779) (517,372)  
Ending, net ₩ (681,297) ₩ (594,779) ₩ (517,372)