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Segment Information - Summary of Segment Information (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | ₩ 26,724,473 | ₩ 26,595,245 | ₩ 26,234,206
Operating income (loss) | 640,058 | 1,428,449 | 1,968,157
Depreciation and Amortization | 3,877,711 | 3,810,131 | 3,655,879
Operating segments [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 31,967,123 | 31,782,093 | 31,456,833
Operating income (loss) | 619,531 | 1,385,818 | 2,073,417
Depreciation and Amortization | 3,986,388 | 3,928,820 | 3,852,350
Operating segments [member] | ICT [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 18,928,705 | 18,698,964 | 18,697,269
Operating income (loss) | 432,809 | 1,193,333 | 1,347,405
Depreciation and Amortization | 3,230,522 | 3,183,408 | 3,105,807
Operating segments [member] | Finance [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 3,558,558 | 3,723,286 | 3,615,307
Operating income (loss) | 143,227 | 91,591 | 119,805
Depreciation and Amortization | 33,629 | 37,150 | 47,638
Operating segments [member] | Satellite TV [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 710,019 | 714,574 | 709,160
Operating income (loss) | (107,397) | (70,170) | 19,797
Depreciation and Amortization | 48,121 | 52,871 | 58,413
Operating segments [member] | Real estate [Member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 546,886 | 499,997 | 474,954
Operating income (loss) | 85,326 | 73,496 | 113,134
Depreciation and Amortization | 69,363 | 70,653 | 65,457
Operating segments [member] | Others [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 8,222,955 | 8,145,272 | 7,960,143
Operating income (loss) | 65,566 | 97,568 | 473,276
Depreciation and Amortization | 604,753 | 584,738 | 575,035
Elimination [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | (5,242,650) | (5,186,848) | (5,222,627)
Operating income (loss) | 20,527 | 42,631 | (105,260)
Depreciation and Amortization | ₩ (108,677) | ₩ (118,689) | ₩ (196,471)

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