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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | ₩ 122,535 | ₩ 278,138 | ₩ 462,888
Borrowings |  | 31,916 |
Repayments | 1,037 | 771 | 15,964
K-REALTY CR-REIT [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Repayments |  |  | 15,964
K Bank Inc.[Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 424,957
Pacific Professional Investors Private Investment Real Estate Investment LLC No.55 [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 11,000
KT Young Entrepreneurs DNA Investment Fund [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 8,400
Mastern KT MultiFamily Real Estate Private Equity Investment Fund 1 [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 6,055
KT-IBKC future investment fund [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | (5,700)
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. 4681 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 | 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 | 31,107 | ₩ 93,478 | ₩ 18,176
Rebellions Co.,Ltd. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | ₩ 19,998 |  |

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