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Information About Non-controlling Interests - Summary of consolidated statements of cash flows (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]      
Cash flows from operating activities ₩ 5,503,289 ₩ 3,597,065 ₩ 5,561,834
Cash flows from investing activities (4,620,508) (4,838,643) (5,137,474)
Cash flows from financing activities (452,792) 669,331 (41,282)
Net increase (decrease) in cash and cash equivalents 430,492 (570,530) 384,968
Cash and cash equivalents at beginning of year 2,449,062 3,019,592 2,634,624
Exchange differences 503 1,717 1,890
Cash and cash equivalents at end of year 2,879,554 2,449,062 3,019,592
KT Skylife Co., Ltd. [member]      
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]      
Cash flows from operating activities 207,207 176,407 102,947
Cash flows from investing activities (125,343) (78,928) (352,116)
Cash flows from financing activities (50,811) (79,455) 230,010
Net increase (decrease) in cash and cash equivalents 31,053 18,024 (19,159)
Cash and cash equivalents at beginning of year 98,695 80,672 99,834
Exchange differences   (1) (3)
Cash and cash equivalents at end of year 129,748 98,695 80,672
BC Card Co., Ltd. [member]      
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]      
Cash flows from operating activities 82,883 (798,043) (157,645)
Cash flows from investing activities (74,430) (7,733) (283,313)
Cash flows from financing activities (67,609) 914,441 526,563
Net increase (decrease) in cash and cash equivalents (59,156) 108,665 85,605
Cash and cash equivalents at beginning of year 435,047 326,482 240,584
Exchange differences (95) (100) 293
Cash and cash equivalents at end of year 375,796 435,047 326,482
KTIS Corporation [Member]      
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]      
Cash flows from operating activities 50,892 13,809 49,011
Cash flows from investing activities (17,636) 9,813 (27,143)
Cash flows from financing activities (32,872) (29,199) (23,126)
Net increase (decrease) in cash and cash equivalents 384 (5,577) (1,258)
Cash and cash equivalents at beginning of year 24,944 30,521 31,779
Cash and cash equivalents at end of year 25,328 24,944 30,521
KTCS Corporation [Member]      
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]      
Cash flows from operating activities 55,146 19,423 6,945
Cash flows from investing activities (5,901) 13,245 (1,039)
Cash flows from financing activities (26,948) (35,578) (16,622)
Net increase (decrease) in cash and cash equivalents 22,297 (2,910) (10,716)
Cash and cash equivalents at beginning of year 61,814 63,884 75,440
Exchange differences   840 (840)
Cash and cash equivalents at end of year 84,111 61,814 63,884
Nasmedia Co Ltd [Member]      
Disclosure of Summarized Consolidated Statements of Cash Flows of Subsidiaries [Line Items]      
Cash flows from operating activities 8,116 22,015 44,500
Cash flows from investing activities (30,910) 3,845 (16,966)
Cash flows from financing activities (11,077) (11,136) (9,843)
Net increase (decrease) in cash and cash equivalents (33,871) 14,724 17,691
Cash and cash equivalents at beginning of year 86,133 71,396 53,720
Exchange differences 15 13 (15)
Cash and cash equivalents at end of year ₩ 52,277 ₩ 86,133 ₩ 71,396