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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)