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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | ₩ 278,138 | ₩ 462,888 | ₩ 255,302
Borrowings | 31,916 |  |
Repayments | 771 | 15,964 | 20,304
K-Realty CR-REITs No.1 [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Repayments |  | 15,964 | 20,304
Studio Discovery Co Ltd [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 3,000
KT Young Entrepreneurs DNA Investment Fund [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  | 8,400 | 3,600
KT-Smart Factory Investment Fund [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 2,800
KT-CKP New Media Investment Fund [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | (109)
K Bank Inc.[Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  | 424,957 | 195,011
Gyeonggi-KT Yoojin Superman Fund [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 1,000
Hyundai Robotics Co Ltd [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | ₩ 50,000
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 |
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) |
Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | 93,478 | ₩ 18,176 |
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 |  |
KRealty 11th Real Estate Investment Trust Company [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Borrowings | 1,916 |  |
Repayments | ₩ 771 |  |

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