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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash flows from (used in) operating activities [abstract] |  |  |
Profit for the year | ₩ 406,669 | ₩ 972,182 | ₩ 1,385,635
Adjustments to reconcile net income |  |  |
Income tax expense | 164,845 | 335,367 | 505,757
Interest income | (409,540) | (392,580) | (340,794)
Interest expense | 432,537 | 410,566 | 320,914
Dividends income | (70,914) | (59,758) | (14,121)
Depreciation | 2,866,974 | 2,773,152 | 2,687,191
Amortization of intangible assets | 651,649 | 691,909 | 627,261
Depreciation of right-of-use assets | 410,925 | 402,737 | 396,214
Provision for severance benefits (defined benefits) | 234,435 | 196,027 | 240,506
Impairment losses on trade receivables | 184,942 | 175,244 | 132,102
Share of net profit or loss of associates and joint ventures | (8,294) | 44,323 | 16,821
Loss(gain) on disposal of associates and joint ventures | (19,057) | (6,982) | (38,024)
Loss(gain) on the disposal of subsidiaries | (44,690) | (28,825) | (216,591)
Loss(gain) on disposal of right-of-use assets | (389) | (1,465) | (978)
Impairment loss on property and equipment and investment in properties | 7,183 | 7,871 | 16,094
Loss(gain) on disposal of property and equipment and investment in properties | 13,894 | 511 | (66,317)
Loss on disposal of intangible assets | 9,402 | 3,601 | 6,393
Loss on impairment of intangible assets | 237,877 | 236,106 | 30,674
Loss on foreign currency translation | 383,045 | 83,899 | 157,017
Gain on valuation and settlement of derivatives, net | (434,765) | (37,249) | (205,381)
Gain on disposal of financial assets at fair value through profit or loss | (10,793) | (2,225) | (2,347)
Loss(Gain) on valuation of financial assets at fair value through profit or loss | 95,118 | 13,920 | 44,833
Loss(gain) on disposal of financial assets at amortized cost | 1 | 1 | 3
Others | 166,366 | 158,820 | (49,891)
Change in operating assets and liabilities, net of effects from purchase of controlled entity and sale of engineering division |  |  |
Decrease(increase) in trade receivables | (79,503) | (124,023) | (43,787)
Increase in other receivables | 384,941 | (1,085,527) | (1,598,216)
Decrease(increase) in other current assets | 77,878 | 250,569 | (101,947)
Increase in other non-current assets | (102,599) | (86,030) | (120,054)
Decrease(increase) in inventories | (67,598) | (317,531) | (179,255)
Increase(decrease) in trade payables | (233,799) | 121,515 | (368,355)
Increase in other payables | (289,044) | 829,220 | 1,103,113
Increase(decrease) in other current liabilities | 620,035 | 414,436 | (30,375)
Decrease in other non-current liabilities | (2,609) | (14,272) | (1,015)
Decrease in provisions | (6,536) | (5,083) | (22,115)
Increase(decrease) in deferred revenue | (1,900) | 905 | (384)
Decrease(increase) in plan assets | 344,869 | 115,725 | (90,771)
Payment of post-employment benefits | (562,307) | (329,861) | (343,931)
Cash generated from operations (1+2+3) | ₩ 5,349,248 | ₩ 5,747,195 | ₩ 3,835,879

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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 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