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Operating Expenses - Summary of Operating Expenses (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Profit (loss) [abstract]      
Employee benefit cost ₩ 4,556,832 ₩ 4,495,885 ₩ 4,215,810
Depreciation 2,723,610 2,637,463 2,605,594
Depreciation of right-of-use assets 402,737 396,214 398,716
Amortization of intangible assets 683,784 622,202 603,327
Commissions 1,264,729 1,295,434 1,125,944
Interconnection charges 436,598 479,500 507,567
International interconnection fee 140,433 186,253 192,008
Purchase of inventories 3,595,345 3,656,040 3,753,792
Changes of inventories (203,071) (195,046) 20,491
Sales commission 2,353,318 2,353,909 2,343,375
Service cost 2,229,709 2,334,386 2,296,324
Utilities 544,675 368,348 364,373
Taxes and dues 250,651 276,962 268,651
Rent 167,576 160,848 123,246
Insurance premium 66,737 68,245 66,717
Installation fee 174,238 150,140 154,542
Advertising expenses 153,750 195,519 171,400
Allowance for bad debts 150,549 115,358 82,329
Card service cost 3,189,376 3,127,673 3,114,047
Loss on disposal of property and equipment 72,710 81,415 71,417
Loss on disposal of intangible assets 5,328 7,015 3,885
Loss on disposal of right-of-use assets 2,115 2,348 11,457
Loss on disposal of investments in subsidiaries 0 0 13,727
Impairment loss on property and equipment 7,871 16,094 2,115
Impairment loss on intangible assets 236,206 30,965 3,747
Donations 24,664 15,642 10,981
Other allowance for bad debts 34,112 17,551 28,066
Others 1,902,214 1,369,686 952,614
Total ₩ 25,166,796 ₩ 24,266,049 ₩ 23,506,262