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Operating Expenses - Summary of Operating Expenses (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Profit (loss) [abstract]      
Salaries and wages ₩ 4,495,885 ₩ 4,215,810 ₩ 4,123,680
Depreciation 2,637,463 2,605,594 2,605,128
Depreciation of right-of-use assets 396,214 398,716 404,175
Amortization of intangible assets 622,202 603,327 624,982
Commissions 1,295,434 1,125,944 965,461
Interconnection charges 479,500 507,567 500,081
International interconnection fee 186,253 192,008 172,529
Purchase of inventories 3,656,040 3,753,792 3,681,801
Changes of inventories (195,046) 20,491 257,041
Sales commission 2,353,909 2,343,375 2,337,127
Service cost 2,334,386 2,296,324 2,102,875
Utilities 368,348 364,373 360,797
Taxes and dues 276,962 268,651 283,197
Rent 160,848 123,246 136,355
Insurance premium 68,245 66,717 71,018
Installation fee 150,140 154,542 132,117
Advertising expenses 195,519 171,400 132,466
Research and development expenses 174,936 168,969 156,940
Card service cost 3,127,673 3,114,047 2,941,669
Loss on disposal of property and equipment 81,415 71,417 75,879
Loss on disposal of intangible assets 7,015 3,885 3,207
Loss on disposal of right-of-use assets 2,348 11,457 7,844
Direct cost of government subsidies 44,022 42,732 31,447
Loss on disposal of investments in subsidiaries 0 13,727 0
Impairment loss on property and equipment 16,094 2,115 79,775
Impairment loss on intangible assets 30,965 3,747 211,637
Donations 15,642 10,981 20,745
Other allowance for bad debts 17,551 28,066 51,333
Others 1,266,086 823,242 947,008
Total ₩ 24,266,049 ₩ 23,506,262 ₩ 23,418,314