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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

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- Definition The amount of expense arising from donations and subsidies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_102&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_99&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 104 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_104&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of expense relating to fees and commissions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_85&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2023-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2023-en-r&anchor=para_73_e_v&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 98 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_98_a&doctype=Standard -URIDate 2023-03-23 + Details
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