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Segment Information - Summary of Segment Information (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [Line Items]      
Operating revenues ₩ 26,234,206 ₩ 25,205,659 ₩ 24,440,647
Operating income (loss) 1,968,157 1,699,397 1,022,333
Depreciation and Amortization 3,655,879 3,607,638 3,634,284
Operating segments [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 31,456,833 29,737,242 28,612,918
Operating income (loss) 2,073,417 1,755,230 1,175,170
Depreciation and Amortization 3,852,350 3,712,507 3,718,122
Operating segments [member] | ICT [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 18,697,269 18,734,342 18,275,765
Operating income (loss) 1,347,405 1,170,920 809,741
Depreciation and Amortization 3,105,807 3,217,643 3,233,878
Operating segments [member] | Finance [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 3,615,307 3,526,743 3,344,286
Operating income (loss) 119,805 104,511 101,825
Depreciation and Amortization 47,638 46,223 41,693
Operating segments [member] | Satellite TV [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 709,160 665,081 668,320
Operating income (loss) 19,797 61,398 64,627
Depreciation and Amortization 58,413 60,980 58,181
Operating segments [member] | Real estate [Member]      
Disclosure of operating segments [Line Items]      
Operating revenues 474,954 336,218 543,587
Operating income (loss) 113,134 27,498 76,431
Depreciation and Amortization 65,457 60,459 56,205
Operating segments [member] | Others [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 7,960,143 6,474,858 5,780,960
Operating income (loss) 473,276 390,903 122,546
Depreciation and Amortization 575,035 327,202 328,165
Elimination [member]      
Disclosure of operating segments [Line Items]      
Operating revenues (5,222,627) (4,531,583) (4,172,271)
Operating income (loss) (105,260) (55,833) (152,837)
Depreciation and Amortization ₩ (196,471) ₩ (104,869) ₩ (83,838)