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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)

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