v3.26.1
Transactions with Related Parties - Account Balances with Related Parties (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of transactions between related parties [Line Items]    
Accounts payable ₩ 240,565  
Loans [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   ₩ 22,147
Loans [member] | SK Holdings Co., Ltd. [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | F&U Credit information Co., Ltd. [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | SK hynix Inc. [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | Daehan Kanggun BcN Co., Ltd. [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   22,147
Loans [member] | Associates [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   22,147
Loans [member] | SK Networks Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | SK Innovation Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | Miscellaneous other related parties [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | Others [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | Mintit Co., Ltd [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | Happy Narae Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | Contents Wavve Corp [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | Incross Co Ltd [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | Eleven Street Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | SK Planet Co Ltd [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Loans [member] | SK Shieldus Co Ltd [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   0
Accounts receivable - trade and others [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 86,690 72,931
Accounts receivable - trade and others [member] | SK Holdings Co., Ltd. [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 9,193 1,668
Accounts receivable - trade and others [member] | F&U Credit information Co., Ltd. [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   54
Accounts receivable - trade and others [member] | SK hynix Inc. [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   12,680
Accounts receivable - trade and others [member] | Other associates [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 1,009 5,158
Accounts receivable - trade and others [member] | Associates [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 1,709 5,212
Accounts receivable - trade and others [member] | SK Networks Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 258 372
Accounts receivable - trade and others [member] | SK Innovation Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 4,996 6,531
Accounts receivable - trade and others [member] | Miscellaneous other related parties [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 11,895 12,703
Accounts receivable - trade and others [member] | Others [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 75,788 66,051
Accounts receivable - trade and others [member] | SK hynix system ic (Wuxi) Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 13,232  
Accounts receivable - trade and others [member] | Mintit Co., Ltd [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 2,553 4
Accounts receivable - trade and others [member] | Happy Narae Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 37 52
Accounts receivable - trade and others [member] | SK m&service Co., Ltd    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 700  
Accounts receivable - trade and others [member] | SK Shieldus Co., Ltd. (Formerly, ADT CAPS Co., Ltd.) [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 15,393  
Accounts receivable - trade and others [member] | Contents Wavve Corp [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 0 1,564
Accounts receivable - trade and others [member] | Incross Co Ltd [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 1,820 1,946
Accounts receivable - trade and others [member] | Eleven Street Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 17,455 16,637
Accounts receivable - trade and others [member] | SK Planet Co Ltd [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 259 980
Accounts receivable - trade and others [member] | SK REIT Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 7,890  
Accounts receivable - trade and others [member] | UNA Engineering Inc. (Formerly, UbiNS Co., Ltd.) [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable 0 0
Accounts receivable - trade and others [member] | SK Shieldus Co Ltd [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts receivable   12,582
Accounts payable - other and others [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 501,882 389,162
Accounts payable - other and others [member] | SK Holdings Co., Ltd. [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 170,652 76,471
Accounts payable - other and others [member] | F&U Credit information Co., Ltd. [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable   4,610
Accounts payable - other and others [member] | SK hynix Inc. [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable   206
Accounts payable - other and others [member] | Other associates [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 1,790 7,001
Accounts payable - other and others [member] | Associates [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 33,871 11,611
Accounts payable - other and others [member] | SK Networks Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 123,865 140,120
Accounts payable - other and others [member] | SK Innovation Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 21,976 28,326
Accounts payable - other and others [member] | Miscellaneous other related parties [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 24,816 27,981
Accounts payable - other and others [member] | Others [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 297,359 301,080
Accounts payable - other and others [member] | SK hynix system ic (Wuxi) Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 291  
Accounts payable - other and others [member] | Mintit Co., Ltd [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 2 0
Accounts payable - other and others [member] | Happy Narae Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 2,851 17,833
Accounts payable - other and others [member] | SK m&service Co., Ltd    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 32,081  
Accounts payable - other and others [member] | SK Shieldus Co., Ltd. (Formerly, ADT CAPS Co., Ltd.) [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 18,754  
Accounts payable - other and others [member] | Contents Wavve Corp [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 6 7
Accounts payable - other and others [member] | Incross Co Ltd [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 25,570 20,353
Accounts payable - other and others [member] | Eleven Street Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 2,189 4,750
Accounts payable - other and others [member] | SK Planet Co Ltd [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 5,933 15,491
Accounts payable - other and others [member] | SK REIT Co., Ltd. [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable 61,835  
Accounts payable - other and others [member] | UNA Engineering Inc. (Formerly, UbiNS Co., Ltd.) [member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable ₩ 9,271 25,498
Accounts payable - other and others [member] | SK Shieldus Co Ltd [Member]    
Disclosure of transactions between related parties [Line Items]    
Accounts payable   ₩ 20,515