v3.26.1
Reporting Entity - Condensed Financial Information of the Significant Subsidiaries (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of subsidiaries [line items]        
Total Assets ₩ 30,107,783 ₩ 30,515,255    
Total Liabilities 17,152,491 18,687,621    
Total equity 12,955,292 11,827,634 ₩ 12,228,399 ₩ 12,155,196
Revenue 17,269,647 18,012,897 17,658,877  
Profit 375,084 1,387,095 1,145,937  
SK Telink Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Total Assets 205,972 210,962 213,920  
Total Liabilities 62,038 63,558 65,049  
Total equity 143,934 147,404 148,871  
Revenue 345,910 341,838 309,091  
Profit 8,946 14,323 17,761  
SK Broadband Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Total Assets 6,824,041 6,806,280 6,442,611  
Total Liabilities 4,011,668 3,760,426 3,323,156  
Total equity 2,812,373 3,045,854 3,119,455  
Revenue 4,540,603 4,415,270 4,281,932  
Profit 141,489 263,967 213,905  
PS&Marketing Corporation [member]        
Disclosure of subsidiaries [line items]        
Total Assets 454,512 448,887 451,549  
Total Liabilities 210,013 218,885 224,042  
Total equity 244,499 230,002 227,507  
Revenue 1,383,335 1,382,361 1,353,321  
Profit 13,748 63 4,681  
SERVICE ACE Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Total Assets 97,050 74,676 83,395  
Total Liabilities 68,222 49,818 54,888  
Total equity 28,828 24,858 28,507  
Revenue 184,525 191,376 197,598  
Profit 2,356 2,585 2,822  
SERVICE TOP Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Total Assets 69,385 60,073 71,196  
Total Liabilities 46,453 42,479 47,641  
Total equity 22,932 17,594 23,555  
Revenue 154,764 166,699 178,423  
Profit 1,103 969 1,738  
SK O&S Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Total Assets 124,327 130,618 140,942  
Total Liabilities 87,023 94,807 98,346  
Total equity 37,304 35,811 42,596  
Revenue 381,574 351,721 345,617  
Profit 630 689 2,614  
Home & Service Co., Ltd. [member]        
Disclosure of subsidiaries [line items]        
Total Assets 148,382 139,664 165,667  
Total Liabilities 110,021 107,379 112,025  
Total equity 38,361 32,285 53,642  
Revenue 516,346 495,546 490,094  
Profit 1,557 3,947 1,297  
SK stoa Co., Ltd [member]        
Disclosure of subsidiaries [line items]        
Total Assets 134,596 116,785 94,041  
Total Liabilities 67,405 56,192 37,253  
Total equity 67,191 60,593 56,788  
Revenue 313,050 302,332 301,496  
Profit 6,518 4,354 (1,427)  
SK m&service Co., Ltd [member]        
Disclosure of subsidiaries [line items]        
Total Assets 0 164,772 153,660  
Total Liabilities 0 100,230 88,195  
Total equity 0 64,542 65,465  
Revenue 46,240 246,999 247,479  
Profit ₩ (4,407) ₩ 220 ₩ 1,253