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Intangible Assets - Summary of Intangible Assets (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about intangible assets [line items]      
Beginning, net ₩ 3,447,333 ₩ 2,161,258  
Acquisition and capital expenditure 346,989 1,720,619  
Disposal and termination (25,668) (13,783)  
Amortization (627,261) (604,744) ₩ (628,154)
Impairment (30,674) (3,748)  
Changes in scope of consolidation (10,266) 156,253  
Others 29,380 31,478  
Ending, net 3,129,833 3,447,333 2,161,258
Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 7,942,556 7,898,325  
Ending, net 8,148,293 7,942,556 7,898,325
Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (4,495,223) (5,737,067)  
Ending, net (5,018,460) (4,495,223) (5,737,067)
Goodwill [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 696,872 230,085  
Acquisition and capital expenditure 19,455 467,394  
Impairment (24,006)    
Changes in scope of consolidation 0 (607)  
Others 15,902 0  
Ending, net 708,223 696,872 230,085
Goodwill [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,002,530 536,093  
Ending, net 1,037,887 1,002,530 536,093
Goodwill [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (305,658) (306,008)  
Ending, net (329,664) (305,658) (306,008)
Development costs [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 228,373 280,999  
Acquisition and capital expenditure 45,997 38,113  
Disposal and termination (5,503) (7,893)  
Amortization (93,374) (92,230)  
Impairment (744) (216)  
Changes in scope of consolidation (2,320) 8,640  
Others (573) 960  
Ending, net 171,856 228,373 280,999
Development costs [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,812,377 1,767,422  
Ending, net 1,803,687 1,812,377 1,767,422
Development costs [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (1,584,004) (1,486,423)  
Ending, net (1,631,831) (1,584,004) (1,486,423)
Software [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 139,425 146,000  
Acquisition and capital expenditure 55,651 36,437  
Disposal and termination (48) (506)  
Amortization (54,748) (52,547)  
Impairment (508) (316)  
Changes in scope of consolidation (802) (4,548)  
Others 16,106 14,905  
Ending, net 155,076 139,425 146,000
Software [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,083,426 1,053,980  
Ending, net 1,156,951 1,083,426 1,053,980
Software [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (944,001) (907,980)  
Ending, net (1,001,875) (944,001) (907,980)
Frequency usage rights [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,839,131 1,160,663  
Acquisition and capital expenditure 0 1,065,096  
Disposal and termination 0 (276)  
Amortization (350,265) (386,741)  
Impairment 0 0  
Others (610) 389  
Ending, net 1,488,256 1,839,131 1,160,663
Frequency usage rights [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 2,617,647 3,373,095  
Ending, net 2,617,707 2,617,647 3,373,095
Frequency usage rights [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (778,516) (2,212,432)  
Ending, net (1,129,451) (778,516) (2,212,432)
Others [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 543,532 343,511  
Acquisition and capital expenditure 225,886 113,579  
Disposal and termination (20,117) (5,108)  
Amortization (128,874) (73,226)  
Impairment (5,416) (3,216)  
Changes in scope of consolidation (7,144) 152,768  
Others (1,445) 15,224  
Ending, net 606,422 543,532 343,511
Others [member] | Gross carrying amount [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net 1,426,576 1,167,735  
Ending, net 1,532,061 1,426,576 1,167,735
Others [member] | Accumulated depreciation and amortisation [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning, net (883,044) (824,224)  
Ending, net ₩ (925,639) ₩ (883,044) ₩ (824,224)