v3.26.1
Reporting Entity - Information of Significant Non-controlling Interests of the Group (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of subsidiaries [line items]      
Current assets ₩ 6,727,130 ₩ 7,476,682  
Non-current assets 23,380,653 23,038,573  
Current liabilities (6,529,775) (9,224,278)  
Non-current liabilities (10,622,716) (9,463,343)  
Carrying amount of non-controlling interests 92,189 129,007  
Revenue 17,269,647 18,012,897 ₩ 17,658,877
Profit for the year 375,084 1,387,095 1,145,937
Total comprehensive income 1,904,918 1,547,871 1,121,970
Profit attributable to non-controlling interests (33,326) 136,940 52,326
Net cash provided by operating activities 3,923,847 5,087,285 4,947,205
Net cash used in investing activities (1,737,109) (2,711,827) (3,352,905)
Net cash used in financing activities (2,711,763) (1,809,853) (2,020,990)
Effects on exchange rate changes on cash and cash equivalents ₩ (4,088) ₩ 26,124 ₩ (623)
SK Broadband Co., Ltd. [member]      
Disclosure of subsidiaries [line items]      
Ownership of non-controlling interests (%) 37.50%   25.40%
Current assets ₩ 10,393   ₩ 1,388,965
Non-current assets 187,491   5,214,315
Current liabilities (16,454)   (1,388,317)
Non-current liabilities 0   (1,988,989)
Net assets 181,430   3,225,974
Carrying amount of non-controlling interests 68,133   819,592
Revenue 0   4,274,747
Profit for the year (91,558)   202,890
Total comprehensive income (98,732)   183,499
Profit attributable to non-controlling interests (34,384)   51,448
Net cash provided by operating activities (4,082)   1,110,847
Net cash used in investing activities 9,738   (1,064,434)
Net cash used in financing activities (25,310)   (60,254)
Effects on exchange rate changes on cash and cash equivalents (890)   9
Net decrease in cash and cash equivalents (20,544)   (13,832)
Dividends paid to non-controlling interests ₩ 0   ₩ 50,557