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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | ₩ 462,888 | ₩ 255,302 | ₩ 25,603
Repayment | 15,964 | 20,304 | 30,385
KT-IBKC future investment fund [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | (5,700) |  | 3,750
Gyeonggi-KT Yoojin Superman Fund [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  | 1,000 | 1,000
K-REALTY CR REIT [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Repayment |  |  | 30,385
K Bank [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | 424,957 | 195,011 | 21,782
KT-CKP New Media Investment Fund [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  | (109) | (174)
KT-DSC creative economy youth start-up investment fund [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | (1,800)
KT Philippines Co. Ltd. [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 99
Virtua Realm Sendirian Berhad [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | 550
KT-Smart Factory Investment Fund [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  | 2,800 | 2,800
KT-SB Venture Investment Fund [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  |  | ₩ (2,404)
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 |
Hyundai Robotics Co Ltd [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash |  | 50,000 |
K-Realty CR-REITs No.1 [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Repayment | 15,964 | ₩ 20,304 |
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 |  |
Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Equity contributions in cash | ₩ 18,176 |  |

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