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Related Party Transactions - Summary of Fund Transactions with Related Parties (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | ₩ 92,552 | ₩ 122,535 | ₩ 278,138
Borrowings |  |  | 31,916
Repayments | 2,337 | 1,037 | 771
Megazone Cloud Corporation [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 130,001
Borrowings |  |  | 30,000
IBK KT Emerging Digital Industry Investment Fund [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 10,800
Mastern KT MultiFamily Real Estate Private Equity Investment Fund [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 18,859
IGIS No. 468-1 General Private Real Estate Investment Company [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 25,000
K-Realty 11th Real Estate Investment Trust Company [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Borrowings |  |  | 1,916
Repayments | 2,337 | 1,037 | 771
STIC Place General Private Placement Real Estate Investment Trust No.2 [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  | 20,000 |
Telco Credit Bureau Co.,Ltd. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  | 6,500 |
Pacific geumto no.75 private hybrid asset fund [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  | 19,000 |
Kiamco Data Center Blind Fund [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  | 15,000 |
STIC Mixed Asset Investment Trust No.1 [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  | 10,930 |
Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | 21,234 | 31,107 | ₩ 93,478
Rebellions Co.,Ltd. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | 12,477 | ₩ 19,998 |
IBKKT Young Entrepreneurs MARS Investment Fund [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | 6,000 |  |
TeamFresh Corp [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | ₩ 52,841 |  |

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