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Cash Generated from Operations - Summary of Cash Flows from Operating Activities (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from (used in) operating activities [abstract] |  |  |
Profit for the year | ₩ 972,182 | ₩ 1,385,635 | ₩ 1,459,395
Adjustments to reconcile net income |  |  |
Income tax expense | 335,367 | 505,757 | 519,016
Interest income | (392,580) | (340,794) | (300,900)
Interest expense | 410,566 | 320,914 | 268,847
Dividends income | (59,758) | (14,121) | (21,525)
Depreciation | 2,773,152 | 2,687,191 | 2,643,894
Amortization of intangible assets | 691,909 | 627,261 | 604,744
Depreciation of right-of-use assets | 402,737 | 396,214 | 398,716
Provision for severance benefits (defined benefits) | 196,027 | 240,506 | 253,491
Impairment losses on trade receivables | 175,244 | 132,102 | 105,344
Share of net profit or loss of associates and joint ventures | 44,323 | 16,821 | (116,061)
Loss(gain) on disposal of associates and joint ventures | (6,982) | (38,024) | 1
Loss(gain) on the disposal of subsidiaries | (28,825) | (216,591) | 13,483
Loss(gain) on disposal of right-of-use assets | (1,465) | (978) | 8,319
Impairment losses on assets held for sale | 0 | 0 | 11
Impairment loss on property and equipment and investment in properties | 7,871 | 16,094 | 2,115
Loss(gain) on disposal of property and equipment and investment in properties | 511 | (66,317) | 17,410
Loss on disposal of intangible assets | 3,601 | 6,393 | 2,159
Loss on impairment of intangible assets | 236,106 | 30,674 | 3,747
Loss on foreign currency translation | 83,899 | 157,017 | 180,921
Gain on valuation and settlement of derivatives, net | (37,249) | (205,381) | (235,130)
Gain on disposal of financial assets at fair value through profit or loss | (2,225) | (2,347) | (29,974)
Loss(Gain) on valuation of financial assets at fair value through profit or loss | 13,920 | 44,833 | (64,660)
Loss(gain) on disposal of financial assets at amortized cost | 1 | 3 | (35)
Others | 158,820 | (49,891) | 84,625
Change in operating assets and liabilities, net of effects from purchase of controlled entity and sale of engineering division |  |  |
Decrease(increase) in trade receivables | (124,023) | (43,787) | 327,031
Increase in other receivables | (1,085,527) | (1,598,216) | (328,610)
Decrease(increase) in other current assets | 250,569 | (101,947) | (89,230)
Increase in other non-current assets | (86,030) | (120,054) | (143,087)
Decrease(increase) in inventories | (317,531) | (179,255) | 32,798
Increase(decrease) in trade payables | 121,515 | (368,355) | 289,044
Increase in other payables | 829,220 | 1,103,113 | 207,583
Increase(decrease) in other current liabilities | 414,436 | (30,375) | 107,993
Decrease in other non-current liabilities | (14,272) | (1,015) | (14,915)
Decrease in provisions | (5,083) | (22,115) | (4,668)
Increase(decrease) in deferred revenue | 905 | (384) | 3,696
Decrease(increase) in plan assets | 115,725 | (90,771) | (114,631)
Payment of post-employment benefits | (329,861) | (343,931) | (241,350)
Cash generated from operations (1+2+3) | ₩ 5,747,195 | ₩ 3,835,879 | ₩ 5,829,607

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Period Type: | duration

X
- Definition Impairment loss recognised in profit or loss property plant and equipment and investment property. + References No definition available. + Details
Name: | kt_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipmentAndInvestmentProperty
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Impairment losses on current assets held for sale. + References No definition available. + Details
Name: | kt_ImpairmentLossesOnCurrentAssetsHeldForSale
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Loss on the disposal of subsidiaries + References No definition available. + Details
Name: | kt_LossOnTheDisposalOfSubsidiaries
Namespace Prefix: | kt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration