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Segment Information - Summary of Segment Information (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | ₩ 26,595,245 | ₩ 26,234,206 | ₩ 25,205,659
Operating income (loss) | 1,428,449 | 1,968,157 | 1,699,397
Depreciation and Amortization | 3,810,131 | 3,655,879 | 3,607,638
Operating segments [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 31,782,093 | 31,456,833 | 29,737,242
Operating income (loss) | 1,385,818 | 2,073,417 | 1,755,230
Depreciation and Amortization | 3,928,820 | 3,852,350 | 3,712,507
Operating segments [member] | ICT [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 18,698,964 | 18,697,269 | 18,734,342
Operating income (loss) | 1,193,333 | 1,347,405 | 1,170,920
Depreciation and Amortization | 3,183,408 | 3,105,807 | 3,217,643
Operating segments [member] | Finance [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 3,723,286 | 3,615,307 | 3,526,743
Operating income (loss) | 91,591 | 119,805 | 104,511
Depreciation and Amortization | 37,150 | 47,638 | 46,223
Operating segments [member] | Satellite TV [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 714,574 | 709,160 | 665,081
Operating income (loss) | (70,170) | 19,797 | 61,398
Depreciation and Amortization | 52,871 | 58,413 | 60,980
Operating segments [member] | Real estate [Member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 499,997 | 474,954 | 336,218
Operating income (loss) | 73,496 | 113,134 | 27,498
Depreciation and Amortization | 70,653 | 65,457 | 60,459
Operating segments [member] | Others [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 8,145,272 | 7,960,143 | 6,474,858
Operating income (loss) | 97,568 | 473,276 | 390,903
Depreciation and Amortization | 584,738 | 575,035 | 327,202
Elimination [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | (5,186,848) | (5,222,627) | (4,531,583)
Operating income (loss) | 42,631 | (105,260) | (55,833)
Depreciation and Amortization | ₩ (118,689) | ₩ (196,471) | ₩ (104,869)

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