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Segment Information - Summary of Segment Information (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [Line Items]      
Operating revenues ₩ 24,440,647 ₩ 24,899,189 ₩ 23,436,050
Operating income (loss) 1,022,333 1,026,970 1,100,860
Depreciation and Amortization 3,634,284 3,629,492 3,281,732
Operating segments [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 28,612,919 28,863,426 27,346,281
Operating income (loss) 1,175,172 1,080,040 1,201,682
Depreciation and Amortization 3,718,122 3,709,297 3,274,768
Operating segments [member] | ICT [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 18,275,765 18,527,631 17,724,320
Operating income (loss) 809,741 634,046 933,191
Depreciation and Amortization 3,233,878 3,229,159 2,917,163
Operating segments [member] | Finance [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 3,686,430 3,795,185 3,771,681
Operating income (loss) 85,008 158,235 148,440
Depreciation and Amortization 53,098 27,852 22,580
Operating segments [member] | Satellite TV [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 706,631 694,637 690,821
Operating income (loss) 71,345 69,357 66,735
Depreciation and Amortization 84,931 94,992 98,310
Operating segments [member] | Others [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 5,944,093 5,845,973 5,159,459
Operating income (loss) 209,078 218,402 53,316
Depreciation and Amortization 346,215 357,294 236,715
Elimination [member]      
Disclosure of operating segments [Line Items]      
Operating revenues (4,172,272) (3,964,237) (3,910,231)
Operating income (loss) (152,839) (53,070) (100,822)
Depreciation and Amortization ₩ (83,838) ₩ (79,805) ₩ 6,964