v3.26.1
Investments in Associates and Joint Ventures - Details of the Changes in Investments in Associates and Joint Ventures Accounted for using the Equity Method (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance ₩ 2,341,827 ₩ 1,915,012
Acquisition and Disposal (48,329) (5,808)
Share of profit (loss) (57,853) 22,620
Other comprehensive income (loss) 45,963 149,108
Other increase (decrease) (43,138) 260,895
Ending balance 2,238,470 2,341,827
SK China Company Ltd. [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 975,443 896,990
Share of profit (loss) 9,707 8,913
Other comprehensive income (loss) 60,753 69,540
Ending balance 1,045,903 975,443
Korea IT Fund [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 363,138 [1] 336,404
Share of profit (loss) 13,519 [1] 23,552
Other comprehensive income (loss) 2,681 [1] 8,237
Other increase (decrease) (8,856) [1] (5,055)
Ending balance [1] 370,482 363,138
UniSK [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 26,031 [1] 22,285
Share of profit (loss) 215 [1] 1,430
Other comprehensive income (loss) 450 [1] 2,815
Other increase (decrease) (254) [1] (499)
Ending balance [1] 26,442 26,031
SK Technology Innovation Company [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 34,516 70,409
Acquisition and Disposal (1,363)  
Share of profit (loss) 1,242 4,269
Other comprehensive income (loss) (872) 8,078
Other increase (decrease)   (48,240)
Ending balance 33,523 34,516
SK MENA Investment B.V. [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 17,273 14,872
Acquisition and Disposal (11,041)  
Share of profit (loss) 401 329
Other comprehensive income (loss) (21) 2,072
Ending balance 6,612 17,273
SK Latin America Investment S.A. [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 1,357 14,607
Acquisition and Disposal (1,676)  
Share of profit (loss) 191 (65)
Other comprehensive income (loss) 128 1,268
Other increase (decrease)   (14,453)
Ending balance   1,357
SK South East Asia Investment Pte. Ltd. [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 391,572 355,282
Share of profit (loss) (1,710) (9,403)
Other comprehensive income (loss) (21,086) 45,693
Ending balance 368,776 391,572
Citadel Pacific Telecom Holdings, LLC [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 51,780 [1] 45,901
Share of profit (loss) 185 [1] 619
Other comprehensive income (loss) 4,640 [1] 6,699
Other increase (decrease) (1,438) [1] (1,439)
Ending balance [1] 55,167 51,780
SM Culture & Contents Co., Ltd. [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 39,567 41,578
Acquisition and Disposal   (3)
Share of profit (loss) (4,220) (1,880)
Other comprehensive income (loss) (153) (128)
Other increase (decrease) (5,889)  
Ending balance 29,305 39,567
Nam Incheon Broadcasting Co., Ltd. [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 15,635 [1] 14,344
Acquisition and Disposal [1] (15,791)  
Share of profit (loss) 293 [1] 1,427
Other increase (decrease) (137) [1] (136)
Ending balance [1]   15,635
Home Choice Corp. [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 3,238 3,215
Share of profit (loss) (465) 23
Ending balance 2,773 3,238
Konan Technology Inc. [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 3,575 6,349
Acquisition and Disposal 3,535 (16)
Share of profit (loss) (2,040) (2,861)
Other comprehensive income (loss)   103
Ending balance 5,070 3,575
CMES Inc. [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 4,772 900
Acquisition and Disposal 3,374 (4,396)
Share of profit (loss) (1,216) (767)
Other comprehensive income (loss) 69 51
Other increase (decrease)   8,984
Ending balance 6,999 4,772
SK telecom Japan Inc. [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 3,703 1,239
Acquisition and Disposal   1,560
Share of profit (loss) 247 (983)
Other comprehensive income (loss) (321) 1,887
Other increase (decrease)   0
Ending balance 3,629 3,703
Rebellions Inc. (Formerly, SAPEON Korea Inc.) [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 298,327  
Acquisition and Disposal (33,620)  
Share of profit (loss) (77,610)  
Other comprehensive income (loss) 369  
Other increase (decrease)   298,327
Ending balance 187,466 298,327
SK m&service Co., Ltd [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Share of profit (loss) [2] 1,037  
Other comprehensive income (loss) [2] (52)  
Other increase (decrease) [2] 23,566  
Ending balance [2] 24,551  
Start-up Win-Win Fund and others [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 102,702 [1],[3],[4] 81,142
Acquisition and Disposal 10,253 [1],[3],[4] (2,953)
Share of profit (loss) 3,458 [1],[3],[4] (1,686)
Other comprehensive income (loss) (622) [1],[3],[4] 2,793
Other increase (decrease) (50,130) [1],[3],[4] 23,406
Ending balance [1],[3],[4] 65,661 102,702
Associates [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 2,332,629 1,905,517
Acquisition and Disposal (46,329) (5,808)
Share of profit (loss) (56,766) 22,917
Other comprehensive income (loss) 45,963 149,108
Other increase (decrease) (43,138) 260,895
Ending balance 2,232,359 2,332,629
UTC Kakao-SK Telecom ESG Fund [member]    
Disclosure of investments in associates and joint ventures [Line Items]    
Beginning balance 9,198 9,495
Acquisition and Disposal (2,000)  
Share of profit (loss) (1,087) (297)
Ending balance ₩ 6,111 ₩ 9,198
[1] Dividends received from the associates are deducted from the carrying amount for the year ended December 31, 2025.
[2] The Group disposed of a portion of shares in SK m&service Co., Ltd., which was an indirect subsidiary of the Parent Company, for the year ended December 31, 2025, resulting in the reclassification of the remaining shares as an investment in associate as of December 31, 2025.
[3] The Group exchanged its entire shares in id Quantique SA for shares in IonQ, Inc. and classified the investment in IonQ, Inc. as a financial asset at FVOCI for the year ended December 31, 2025.
[4] The acquisition for the year ended December 31, 2025 includes ₩10,596 million of investments in Syntelligence AI Ltd.