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Segment Information - Summary of Segment Information (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | ₩ 24,899,189 | ₩ 23,436,050 | ₩ 23,546,929
Operating income (loss) | 1,020,174 | 1,100,860 | 1,069,092
Depreciation and Amortization | 3,638,920 | 3,281,732 | 3,364,502
Operating segments [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 28,863,426 | 27,346,281 | 27,343,782
Operating income (loss) | 1,073,244 | 1,201,682 | 1,760,949
Depreciation and Amortization | 3,718,725 | 3,274,768 | 3,356,126
Operating segments [member] | ICT [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 18,527,631 | 17,724,320 | 17,731,569
Operating income (loss) | 627,250 | 933,191 | 1,302,639
Depreciation and Amortization | 3,238,587 | 2,917,163 | 3,016,531
Operating segments [member] | Finance [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 3,556,776 | 3,560,417 | 3,637,917
Operating income (loss) | 157,843 | 145,463 | 205,678
Depreciation and Amortization | 26,741 | 22,504 | 28,827
Operating segments [member] | Satellite TV [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 694,637 | 690,821 | 685,822
Operating income (loss) | 69,357 | 66,735 | 75,373
Depreciation and Amortization | 94,992 | 98,310 | 99,216
Operating segments [member] | Others [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | 6,084,382 | 5,370,723 | 5,288,474
Operating income (loss) | 218,794 | 56,293 | 177,259
Depreciation and Amortization | 358,405 | 236,791 | 211,552
Elimination [member] |  |  |
Disclosure of operating segments [Line Items] |  |  |
Operating revenues | (3,964,237) | (3,910,231) | (3,796,853)
Operating income (loss) | (53,070) | (100,822) | (691,857)
Depreciation and Amortization | ₩ (79,805) | ₩ 6,964 | ₩ 8,376

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