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Information About Non-controlling Interests (Tables)
 12 Months Ended
Dec. 31, 2025
Disclosure of subsidiaries [abstract]  
Schedule of Changes in Accumulated Non-controlling Interests
Profit or loss allocated to non-controlling interests and accumulated non-controlling interests of subsidiaries that are material to the Group for the years ended December 31, 2023, 2024 and 2025 are as follows:
December 31, 2023
(In millions of Korean won)Non-
controlling
Interests
rate (%)		Accumulated
non-controlling
interests at the
beginning of
the year		Profit or loss
allocated to
non-
controlling
interests		Dividends
paid
to non-
controlling
interests		OthersAccumulated
non-controlling
interests at the
end of the year
KT Skylife Co., Ltd.49.4%₩423,189 ₩(47,355)₩(8,287)₩(6,192)₩361,355 
BC Card Co., Ltd.30.5%524,657 25,355 (4,960)3,023 548,075 
KTIS Corporation66.7%141,402 5,947 (2,451)(1,872)143,026 
KTCS Corporation78.3%153,881 14,228 (3,001)(2,313)162,795 
KT Nasmedia Co.,Ltd.55.9%135,425 10,679 (4,028)(467)141,609 
December 31, 2024
(In millions of Korean won)Non-
controlling
Interests
rate (%)		Accumulated
non-controlling
interests at the
beginning of
the year		Profit or loss
allocated to
non-
controlling
interests		Dividends
paid
to non-
controlling
interests		OthersAccumulated
non-controlling
interests at the
end of the year
KT Skylife Co., Ltd.49.5%₩361,355 ₩(71,590)₩(8,184)₩680 ₩282,261 
BC Card Co., Ltd.30.5%548,075 45,135 (2,010)7,222 598,422 
KTIS Corporation66.7%143,026 6,305 (2,451)(861)146,019 
KTCS Corporation78.3%162,795 5,221 (2,501)(566)164,949 
KT Nasmedia Co., Ltd.55.9%141,609 (2,071)(4,428)419 135,529 
December 31, 2025
(In millions of Korean won)Non-
controlling
Interests
rate (%)		Accumulated
non-controlling
interests at the
beginning of
the year		Profit or loss
allocated to
non-
controlling
interests		Dividends
paid
to non-
controlling
interests		OthersAccumulated
non-controlling
interests at the
end of the year
KT Skylife Co., Ltd.49.5%₩282,261 ₩2,862 ₩(8,186)₩826 ₩277,763 
BC Card Co., Ltd.30.5%598,422 47,047 — 3,919 649,388 
KTIS Corporation66.6%146,019 28,334 (2,451)5,263 177,165 
KTCS Corporation78.2%164,949 23,099 (2,501)1,087 186,634 
KT Nasmedia Co., Ltd.55.9%135,529 3,472 (4,428)(20,392)114,181 
Schedule of Financial Information on Subsidiaries
The summarized financial information for each subsidiary with non-controlling interests that are material to the Group, before inter-company eliminations, is as follows:
December 31, 2024
(in millions of Korean won)KT Skylife
 Co., Ltd.		BC Card Co.,
 Ltd.		KTIS
 Corporation		KTCS
 Corporation		KT Nasmedia
 Co., Ltd.
Current assets₩434,876 ₩3,130,823 ₩129,015 ₩293,408 ₩427,146 
Non-current assets605,312 2,830,224 340,917 141,659 65,636 
Current liabilities242,754 3,147,202 122,879 189,900 244,498 
Non-current liabilities220,840 1,049,521 138,947 42,229 8,209 
Equity576,594 1,764,324 208,106 202,938 240,075 
December 31, 2025
(in millions of Korean won)KT Skylife
 Co., Ltd.		BC Card Co.,
 Ltd.		KTIS
 Corporation		KTCS
 Corporation		KT Nasmedia
 Co., Ltd.
Current assets₩427,105 ₩3,214,765 ₩181,957 ₩319,276 ₩376,595 
Non-current assets548,295 3,343,539 267,570 151,697 63,671 
Current liabilities252,286 2,859,335 107,498 204,138 227,143 
Non-current liabilities160,794 1,766,718 103,562 41,668 11,433 
Equity562,320 1,932,251 238,467 225,167 201,690 
Schedule of Consolidated Statements of Comprehensive Income
Summarized consolidated statements of comprehensive income for the years ended December 31, 2023, 2024 and 2025 are as follows:
2023
(in millions of Korean won)KT Skylife
 Co., Ltd.		BC Card Co.,
 Ltd.		KTIS
 Corporation		KTCS
 Corporation		KT Nasmedia
 Co., Ltd.
Operating revenue₩1,034,342 ₩4,027,450 ₩593,162 ₩1,035,911 ₩147,934 
Profit for the year(109,407)76,545 13,922 15,804 17,703 
Other comprehensive income (loss)(6,625)13,832 (3,162)(2,550)(1,890)
Total comprehensive income(116,032)90,377 10,760 13,254 15,813 
2024
(in millions of Korean won)KT Skylife
 Co., Ltd.		BC Card Co.,
 Ltd.		KTIS
 Corporation		KTCS
 Corporation		KT Nasmedia
 Co., Ltd.
Operating revenue₩1,026,644 ₩3,806,858 ₩604,479 ₩1,122,264 ₩143,639 
Profit for the year(156,033)141,149 11,862 6,814 (3,884)
Other comprehensive income (loss)(3,019)636 (4,172)(133)898 
Total comprehensive income(159,052)141,785 7,690 6,681 (2,986)
2025
(in millions of Korean won)KT Skylife
 Co., Ltd.		BC Card Co.,
 Ltd.		KTIS
 Corporation		KTCS
 Corporation		KT Nasmedia
 Co., Ltd.
Operating revenue₩989,538 ₩3,638,935 ₩637,488 ₩1,044,653 ₩126,564 
Profit for the year585 151,717 36,423 25,107 6,799 
Other comprehensive income (loss)1,631 14,363 15 917 3,408 
Total comprehensive income2,216 166,080 36,438 26,024 10,207 
Schedule of Consolidated Statements of Cash Flows
Summarized consolidated statements of cash flows for the years ended December 31, 2023, 2024 and 2025 are as follows:
2023
(in millions of Korean won)KT Skylife
 Co., Ltd.		BC Card Co.,
 Ltd.		KTIS
 Corporation		KTCS
 Corporation		KT Nasmedia
 Co., Ltd.
Cash flows from operating activities₩207,207 ₩82,883 ₩50,892 ₩55,146 ₩8,116 
Cash flows from investing activities(125,343)(74,430)(17,636)(5,901)(30,910)
Cash flows from financing activities(50,811)(67,609)(32,872)(26,948)(11,077)
Net increase (decrease) in cash and cash equivalents31,053 (59,156)384 22,297 (33,871)
Cash and cash equivalents at beginning of year98,695 435,047 24,944 61,814 86,133 
Exchange differences— (95)— — 15 
Cash and cash equivalents at end of the year129,748 375,796 25,328 84,111 52,277 
2024
(in millions of Korean won)KT Skylife
 Co., Ltd.		BC Card Co.,
 Ltd.		KTIS
 Corporation		KTCS
 Corporation		KT Nasmedia
 Co., Ltd.
Cash flows from operating activities₩162,281 ₩(97,232)₩61,770 ₩44,551 ₩35,867 
Cash flows from investing activities(160,757)(30,579)(9,923)1,661 (22,210)
Cash flows from financing activities9,510 121,800 (32,762)(25,211)(11,803)
Net increase (decrease) in cash and cash equivalents11,034 (6,011)19,085 21,001 1,854 
Cash and cash equivalents at beginning of year129,748 375,796 25,328 84,111 52,277 
Exchange differences— 358 — — 45 
Cash and cash equivalents at end of the year140,782 370,143 44,413 105,112 54,176 
2025
(in millions of Korean won)KT Skylife
 Co., Ltd.		BC Card Co.,
 Ltd.		KTIS
 Corporation		KTCS
 Corporation		KT Nasmedia
 Co., Ltd.
Cash flows from operating activities₩99,935₩(239,619)₩35,502₩53,443₩35,290
Cash flows from investing activities(161,353)(52,803)(16,753)(28,241)(43,218)
Cash flows from financing activities(24,112)664,424 (26,634)(26,830)(18,933)
Net increase (decrease) in cash and cash equivalents(85,530)372,002 (7,885)(1,628)(26,861)
Cash and cash equivalents at beginning of year140,782 370,143 44,413 105,112 54,176 
Exchange differences(1,500)(12,949)— — (101)
Cash and cash equivalents at end of the year53,752 729,196 36,528 103,484 27,214 
Schedule of Changes in Ownership Interest on the Equity Attributable to Owners
The effect of changes in the ownership interest on the equity attributable to owners of the Group for the years ended December 31, 2023, 2024 and 2025 is summarized as follows:
(in millions of Korean won)202320242025
Carrying amount of non-controlling interests acquired₩3,022 ₩(20,329)₩4,100 
Consideration paid to non-controlling interests213,819 (38)(231)
Effect of changes in equity (net amount)₩216,841 ₩(20,367)₩3,869