XML 151 R138.htm IDEA: XBRL DOCUMENT
v3.25.1

Borrowings - Summary of Long-term Borrowings (Detail) € in Millions, ₩ in Millions, UZS in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 KRW (₩) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 UZS | Dec. 31, 2023 KRW (₩) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 0.00% | 0.00% | 0.00% | 0.00% |  |  |
Borrowings | ₩ 10,520,690 |  |  |  | ₩ 10,218,165 |  |
Total | 6,615,938 |  |  |  | 7,159,601 |  |
Long-term borrowings [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | 931,040 |  |  |  | 1,356,251 |  |
Less: Current portion | (371,451) |  |  |  | (699,800) |  |
Total | ₩ 559,589 |  |  |  | 656,451 |  |
Long-term borrowings [member] | Export-Import Bank of Korea [member] | Inter-Korean Cooperation Fund [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 1.00% | 1.00% | 1.00% | 1.00% |  |  |
Borrowings | ₩ 987 |  |  |  | 1,480 |  |
Long-term borrowings [member] | CA-CIB [member] | General loans [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 3.82% | 3.82% | 3.82% | 3.82% |  |  |
Borrowings | ₩ 100,000 |  |  |  | 200,000 |  |
Long-term borrowings [member] | JPM [Member] | General loans [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 2.70% | 2.70% | 2.70% | 2.70% |  |  |
Borrowings | ₩ 100,000 |  |  |  | 200,000 |  |
Long-term borrowings [member] | DBS [Member] | General loans [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 3.82% | 3.82% | 3.82% | 3.82% |  |  |
Borrowings | ₩ 100,000 |  |  |  | 100,000 |  |
Long-term borrowings [member] | Shinhan Bank [member] | General loans [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 4.09% | 4.09% | 4.09% | 4.09% |  |  |
Borrowings | ₩ 100,000 |  |  |  |  |  |
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 1 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates description | Term SOFR(3M)+1.700 |  |  |  |  |  |
Borrowings | ₩ 13,098 | $ 8,910 |  |  | 11,489 | $ 8,910 |
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 2 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings |  |  |  |  | 40,655 | 31,472 |
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 3 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 4.49% | 4.49% | 4.49% | 4.49% |  |  |
Borrowings | ₩ 62,398 |  |  |  | 62,398 |  |
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 4 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates description | Term SOFR(3M)+1.300 |  |  |  |  |  |
Borrowings | ₩ 31,056 | $ 21,127 |  |  | 27,241 | 21,127 |
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 5 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates description | Term SOFR(3M)+1.940 |  |  |  |  |  |
Borrowings | ₩ 51,450 | $ 35,000 |  |  | 45,129 | $ 35,000 |
Long-term borrowings [member] | Shinhan Bank [member] | General Loans 6 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings |  |  |  |  | 16,900 |  |
Long-term borrowings [member] | Woori Bank [Member] | General loans [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates description | EURIBOR(3M)+0.950 |  |  |  |  |  |
Borrowings | ₩ 10,548 |  | € 6,900 |  | 10,985 |  | € 7,700
Long-term borrowings [member] | Woori Bank [Member] | General Loans 1 [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 5.15% | 5.15% | 5.15% | 5.15% |  |  |
Borrowings | ₩ 26,526 |  |  |  | 41,526 |  |
Long-term borrowings [member] | Hi Investment Securities [Member] | CP [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 2.302% | 2.302% | 2.302% | 2.302% |  |  |
Borrowings | ₩ 95,321 |  |  |  | 92,994 |  |
Long-term borrowings [member] | Bookook investment [member] | CP [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings |  |  |  |  | 19,525 |  |
Long-term borrowings [member] | Korea Investment [member] | CP [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 3.622% | 3.622% | 3.622% | 3.622% |  |  |
Borrowings | ₩ 78,933 |  |  |  | 75,928 |  |
Long-term borrowings [member] | Korea Development Bank [member] | General loans [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | ₩ 33,000 |  |  |  | 137,000 |  |
Long-term borrowings [member] | Korea Development Bank [member] | General loans [member] | Bottom of range [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 4.74% | 4.74% | 4.74% | 4.74% |  |  |
Long-term borrowings [member] | Korea Development Bank [member] | General loans [member] | Top of range [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 4.96% | 4.96% | 4.96% | 4.96% |  |  |
Long-term borrowings [member] | KDB Bank Uzbekistan [Member] | Loans [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 23.00% | 23.00% | 23.00% | 23.00% |  |  |
Borrowings | ₩ 4,999 |  |  | UZS 45,448,426 |  |  |
Long-term borrowings [member] | KDB Bank Uzbekistan [Member] | Loans 1 [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 10.30% | 10.30% | 10.30% | 10.30% |  |  |
Borrowings | ₩ 7,725 | $ 5,400 |  |  |  |  |
Long-term borrowings [member] | NH Jayang [Member] | PF Loans [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates description | CD(91D)+1.150 |  |  |  |  |  |
Borrowings | ₩ 8,366 |  |  |  | 53,033 |  |
Long-term borrowings [member] | Kyobo Life Insurance [Member] | PF Loans [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | ₩ 44,385 |  |  |  | 84,586 |  |
Long-term borrowings [member] | Kyobo Life Insurance [Member] | PF Loans [Member] | Bottom of range [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates description | CD(91D)+1.150 |  |  |  |  |  |
Long-term borrowings [member] | Kyobo Life Insurance [Member] | PF Loans [Member] | Top of range [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates description | CD(91D)+3.450 |  |  |  |  |  |
Long-term borrowings [member] | Standard Chartered Bank Korea [Member] | PF Loans [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | ₩ 29,590 |  |  |  | 56,390 |  |
Long-term borrowings [member] | Standard Chartered Bank Korea [Member] | PF Loans [Member] | Bottom of range [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates description | CD(91D)+1.150 |  |  |  |  |  |
Long-term borrowings [member] | Standard Chartered Bank Korea [Member] | PF Loans [Member] | Top of range [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates description | CD(91D)+3.450 |  |  |  |  |  |
Long-term borrowings [member] | General loans [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings |  |  |  |  | 32,000 |  |
Long-term borrowings [member] | Samsung Life Insurance [Member] | PF Loans [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Borrowings | ₩ 24,658 |  |  |  | ₩ 46,992 |  |
Long-term borrowings [member] | Samsung Life Insurance [Member] | PF Loans [Member] | Bottom of range [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 1.86% | 1.86% | 1.86% | 1.86% |  |  |
Long-term borrowings [member] | Samsung Life Insurance [Member] | PF Loans [Member] | Top of range [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 4.16% | 4.16% | 4.16% | 4.16% |  |  |
Long-term borrowings [member] | Kookmin Bank [member] | General loans [member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Annual interest rates | 4.75% | 4.75% | 4.75% | 4.75% |  |  |
Borrowings | ₩ 8,000 |  |  |  |  |  |

X
- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_Borrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_BorrowingsInterestRate
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_BorrowingsInterestRateBasis
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_CurrentPortionOfLongtermBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_LongtermBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=ifrs-full_LongtermBorrowingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_ExportImportBankOfKoreaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_InterKoreanCooperationFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_CaCibMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_GeneralLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_JPMMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_DBSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_ShinhanBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_GeneralLoansOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_GeneralLoansTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_GeneralLoansThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_GeneralLoansFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_GeneralLoansFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_GeneralLoansSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_WooriBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_HiInvestmentSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_CPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_BookookInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_KoreaInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_KoreaDevelopmentBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_KdbBankUzbekistanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_LoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_LoanOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_NhJayangMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=kt_PfLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_KyoboLifeInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_StandardCharteredBankKoreaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_GeneralLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_SamsungLifeInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=kt_KookminBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |