v3.26.1
Transactions with Related Parties - Transactions with Related Parties (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others ₩ 598,022 ₩ 388,420 ₩ 440,386
Operating expense and others 2,277,567 2,406,342 2,340,143
Acquisition of property and equipment 538,226 348,365 331,956
SK hynix Inc. [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 64,330 50,127 58,725
Operating expense and others 792 256 178
Acquisition of property and equipment 0    
SK Holdings Co., Ltd. [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 34,002 19,501 21,438
Operating expense and others 618,183 660,578 633,265
Acquisition of property and equipment 256,314 125,691 120,926
F&U Credit information Co., Ltd. [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 4,584 3,227 3,876
Operating expense and others 34,214 48,035 49,398
Acquisition of property and equipment 1,211 266 552
SK AMERICAS Inc. (formerly, SK USA Inc.) [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others   649  
Operating expense and others   5,462 5,384
Happy Narae Co., Ltd. [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 709 1,317 1,472
Operating expense and others 32,268 15,760 35,461
Acquisition of property and equipment 42,137 108,074 92,375
Daehan Kanggun BcN Co., Ltd. [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others   9,551 12,972
Other associates [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 22,144 10,154 8,806
Operating expense and others 25,439 13,051 15,962
Acquisition of property and equipment 129 296 865
Content Wavve Co., Ltd. [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 8,422 13,432 14,524
Operating expense and others 59,667 83,164 87,263
Acquisition of property and equipment 0 0 176
Associates [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 41,919 23,581 25,654
Operating expense and others 59,653 66,548 70,744
Acquisition of property and equipment 101,162 562 1,417
SK Innovation Co., Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 8,566 14,630 33,571
Operating expense and others 18,819 16,757 18,977
Acquisition of property and equipment 2,050    
SK Energy Co., Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 1,793 3,822 4,113
Operating expense and others 74 264 540
Acquisition of property and equipment 0    
SK Networks Co., Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 9,786 5,096 5,876
Operating expense and others 977,911 1,011,217 970,662
Acquisition of property and equipment 0 0 1
SK Networks Services Co., Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 4,964 5,300 5,471
Operating expense and others 60,740 67,713 72,274
Acquisition of property and equipment 3,928 4,352 8,393
Miscellaneous other related parties [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 39,459 47,355 52,039
Operating expense and others 50,603 75,040 21,884
Acquisition of property and equipment 20,130 25,236 13,292
Others [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 522,101 345,338 393,294
Operating expense and others 1,599,731 1,679,216 1,636,134
Acquisition of property and equipment 180,750 222,112 209,613
SK RENT A C A R Co., Ltd [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 215,701 8,336 14,023
Operating expense and others 1,174 14,462 20,231
Acquisition of property and equipment 0 169  
DREAMUS COMPANY [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 3,915 5,526 6,202
Operating expense and others 50,339 66,242 77,452
Acquisition of property and equipment 0 265 284
SK Planet Co Ltd [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 7,990 15,580 18,308
Operating expense and others 74,562 84,536 88,250
Acquisition of property and equipment 1,670 14,656 16,338
Eleven Street Co., Ltd. [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 72,221 69,448 72,683
Operating expense and others 29,817 31,277 34,053
Acquisition of property and equipment 0    
Penguin Solutions Inc [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 15,191    
Acquisition of property and equipment 99,822    
UNA Engineering Inc. (Formerly, UbiNS Co., Ltd.) [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 92 88 172
Operating expense and others 57,350 55,902 50,263
Acquisition of property and equipment 47,061 50,497 52,733
One Store Co Ltd [member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 12,365 14,588 16,265
Operating expense and others 37 1,604 166
Acquisition of property and equipment 0    
Tmap Mobility Co Ltd [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 12,221 24,291 24,862
Operating expense and others 5,503 6,452 10,003
Acquisition of property and equipment 0 0 0
SK Geo Centric Co Ltd [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 810 847 835
Operating expense and others 320 187 2
Acquisition of property and equipment 0    
SK Ecoplant Co Ltd [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 2,959 2,993 2,547
Operating expense and others 286 0 0
Acquisition of property and equipment 34,765    
SK Magic Co Ltd [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 1,391 1,522 1,632
Operating expense and others 1,165 796 1,142
Acquisition of property and equipment 0    
SK Shieldus Co Ltd [Member]      
Disclosure of transactions between related parties [Line Items]      
Operating revenue and others 54,407 61,040 59,974
Operating expense and others 178,304 147,587 147,333
Acquisition of property and equipment ₩ 29,009 ₩ 18,863 ₩ 26,021