v3.26.1
Borrowings and Debentures - Debentures (Detail)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2025
KRW (₩)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
KRW (₩)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about borrowings [line items]        
Debentures ₩ 8,213,904 [1]   ₩ 8,511,280  
Less current installments of bonds (919,459)   (2,147,634)  
Debentures, excluding current installments, net ₩ 7,294,445   6,363,646  
Convertible bonds due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [2] 2028      
Annual interest rate (%) [2] 0.00% 0.00%    
Debentures [2] ₩ 0      
Convertible bonds due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [2] 2028      
Annual interest rate (%) [2] 0.00% 0.00%    
Debentures [2] ₩ 0      
Gross amount [member]        
Disclosure of detailed information about borrowings [line items]        
Debentures ₩ 8,236,908   8,526,303  
Gross amount [member] | Unsecured corporate bonds with 3.45% interest due 2032 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2032      
Annual interest rate (%) 3.45% 3.45%    
Debentures ₩ 90,000   90,000  
Gross amount [member] | Unsecured corporate bonds with 3.22% interest due 2033 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2033      
Annual interest rate (%) 3.22% 3.22%    
Debentures ₩ 130,000   130,000  
Gross amount [member] | Unsecured corporate bonds with 2.49% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2025      
Annual interest rate (%) 2.49% 2.49%    
Debentures ₩ 0   150,000  
Gross amount [member] | Unsecured corporate bonds with 2.61% interest due 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2030      
Annual interest rate (%) 2.61% 2.61%    
Debentures ₩ 50,000   50,000  
Gross amount [member] | Unsecured corporate bonds with 2.66% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2025      
Annual interest rate (%) 2.66% 2.66%    
Debentures ₩ 0   70,000  
Gross amount [member] | Unsecured corporate bonds with 2.82% interest due 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2030      
Annual interest rate (%) 2.82% 2.82%    
Debentures ₩ 90,000   90,000  
Gross amount [member] | Unsecured corporate bonds with 2.55% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2025      
Annual interest rate (%) 2.55% 2.55%    
Debentures ₩ 0   100,000  
Gross amount [member] | Unsecured corporate bonds with 2.75% interest due 2035 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2035      
Annual interest rate (%) 2.75% 2.75%    
Debentures ₩ 70,000   70,000  
Gross amount [member] | Unsecured corporate bonds with 2.08% interest due 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2026      
Annual interest rate (%) 2.08% 2.08%    
Debentures ₩ 90,000   90,000  
Gross amount [member] | Unsecured corporate bonds with 2.24% interest due 2036 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2036      
Annual interest rate (%) 2.24% 2.24%    
Debentures ₩ 80,000   80,000  
Gross amount [member] | Unsecured corporate bonds with 1.97% interest due 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2026      
Annual interest rate (%) 1.97% 1.97%    
Debentures ₩ 120,000   120,000  
Gross amount [member] | Unsecured corporate bonds with 2.17% interest due 2031 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2031      
Annual interest rate (%) 2.17% 2.17%    
Debentures ₩ 50,000   50,000  
Gross amount [member] | Unsecured corporate bonds with 2.55% interest due 2027 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2027      
Annual interest rate (%) 2.55% 2.55%    
Debentures ₩ 100,000   100,000  
Gross amount [member] | Unsecured corporate bonds with 2.65% interest due 2032 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2032      
Annual interest rate (%) 2.65% 2.65%    
Debentures ₩ 90,000   90,000  
Gross amount [member] | Unsecured corporate bonds with 2.84% interest due 2027 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2027      
Annual interest rate (%) 2.84% 2.84%    
Debentures ₩ 100,000   100,000  
Gross amount [member] | Unsecured corporate bonds with 3.00% interest due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2028      
Annual interest rate (%) 3.00% 3.00%    
Debentures ₩ 200,000   200,000  
Gross amount [member] | Unsecured corporate bonds with 3.02% interest due 2038 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2038      
Annual interest rate (%) 3.02% 3.02%    
Debentures ₩ 90,000   90,000  
Gross amount [member] | Unsecured corporate bonds with 2.44% interest due 2038 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2038      
Annual interest rate (%) 2.44% 2.44%    
Debentures ₩ 50,000   50,000  
Gross amount [member] | Unsecured corporate bonds with 2.19% interest due 2029 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2029      
Annual interest rate (%) 2.19% 2.19%    
Debentures ₩ 50,000   50,000  
Gross amount [member] | Unsecured corporate bonds with 2.23% interest due 2039 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2039      
Annual interest rate (%) 2.23% 2.23%    
Debentures ₩ 50,000   50,000  
Gross amount [member] | Unsecured corporate bonds with 1.50% interest due 2029 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2029      
Annual interest rate (%) 1.50% 1.50%    
Debentures ₩ 120,000   120,000  
Gross amount [member] | Unsecured corporate bonds with 1.52% interest due 2039 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2039      
Annual interest rate (%) 1.52% 1.52%    
Debentures ₩ 50,000   50,000  
Gross amount [member] | Unsecured corporate bonds with 1.56% interest due 2049 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2049      
Annual interest rate (%) 1.56% 1.56%    
Debentures ₩ 50,000   50,000  
Gross amount [member] | Unsecured corporate bonds with 1.79% interest due 2029 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2029      
Annual interest rate (%) 1.79% 1.79%    
Debentures ₩ 40,000   40,000  
Gross amount [member] | Unsecured corporate bonds with 1.81% interest due 2039 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2039      
Annual interest rate (%) 1.81% 1.81%    
Debentures ₩ 60,000   60,000  
Gross amount [member] | Unsecured corporate bonds with 1.75% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2025      
Annual interest rate (%) 1.75% 1.75%    
Debentures ₩ 0   130,000  
Gross amount [member] | Unsecured corporate bonds with 1.83% interest due 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2030      
Annual interest rate (%) 1.83% 1.83%    
Debentures ₩ 50,000   50,000  
Gross amount [member] | Unsecured corporate bonds with 1.87% interest due 2040 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2040      
Annual interest rate (%) 1.87% 1.87%    
Debentures ₩ 70,000   70,000  
Gross amount [member] | Unsecured corporate bonds with 1.40% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2025      
Annual interest rate (%) 1.40% 1.40%    
Debentures ₩ 0   140,000  
Gross amount [member] | Unsecured corporate bonds with 1.59% interest due 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2030      
Annual interest rate (%) 1.59% 1.59%    
Debentures ₩ 40,000   40,000  
Gross amount [member] | Unsecured corporate bonds with 1.76% interest due 2040 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2040      
Annual interest rate (%) 1.76% 1.76%    
Debentures ₩ 110,000   110,000  
Gross amount [member] | Unsecured corporate bonds with 1.39% interest due 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2026      
Annual interest rate (%) 1.39% 1.39%    
Debentures ₩ 80,000   80,000  
Gross amount [member] | Unsecured corporate bonds with 1.80% interest due 2031 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2031      
Annual interest rate (%) 1.80% 1.80%    
Debentures ₩ 50,000   50,000  
Gross amount [member] | Unsecured corporate bonds with 1.89% interest due 2041 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2041      
Annual interest rate (%) 1.89% 1.89%    
Debentures ₩ 100,000   100,000  
Gross amount [member] | Unsecured corporate bonds with 2.69% interest due 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2026      
Annual interest rate (%) 2.69% 2.69%    
Debentures ₩ 70,000   70,000  
Gross amount [member] | Unsecured corporate bonds with 2.68% interest due 2041 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2041      
Annual interest rate (%) 2.68% 2.68%    
Debentures ₩ 40,000   40,000  
Gross amount [member] | Unsecured corporate bonds with 3.80% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2025      
Annual interest rate (%) 3.80% 3.80%    
Debentures ₩ 0   240,000  
Gross amount [member] | Unsecured corporate bonds with 3.84% interest due 2027 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2027      
Annual interest rate (%) 3.84% 3.84%    
Debentures ₩ 70,000   70,000  
Gross amount [member] | Unsecured corporate bonds with 3.78% interest due 2042 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2042      
Annual interest rate (%) 3.78% 3.78%    
Debentures ₩ 40,000   40,000  
Gross amount [member] | Unsecured corporate bonds with 4.00% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2025      
Annual interest rate (%) 4.00% 4.00%    
Debentures ₩ 0   300,000  
Gross amount [member] | Unsecured corporate bonds with 4.00% interest due 2027 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2027      
Annual interest rate (%) 4.00% 4.00%    
Debentures ₩ 95,000   95,000  
Gross amount [member] | Unsecured corporate bonds with 4.73% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2025      
Annual interest rate (%) 4.73% 4.73%    
Debentures ₩ 0   110,000  
Gross amount [member] | Unsecured corporate bonds with 4.74% interest due 2027 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2027      
Annual interest rate (%) 4.74% 4.74%    
Debentures ₩ 60,000   60,000  
Gross amount [member] | Unsecured corporate bonds with 4.69% interest due 2032 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2032      
Annual interest rate (%) 4.69% 4.69%    
Debentures ₩ 40,000   40,000  
Gross amount [member] | Unsecured corporate bonds with 3.65% interest due 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2026      
Annual interest rate (%) 3.65% 3.65%    
Debentures ₩ 110,000   110,000  
Gross amount [member] | Unsecured corporate bonds with 3.83% interest due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2028      
Annual interest rate (%) 3.83% 3.83%    
Debentures ₩ 190,000   190,000  
Gross amount [member] | Unsecured corporate bonds with 3.72% interest due 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2026      
Annual interest rate (%) 3.72% 3.72%    
Debentures ₩ 80,000   80,000  
Gross amount [member] | Unsecured corporate bonds with 3.80% interest due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2028      
Annual interest rate (%) 3.80% 3.80%    
Debentures ₩ 200,000   200,000  
Gross amount [member] | Unsecured corporate bonds with 3.96% interest due 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2030      
Annual interest rate (%) 3.96% 3.96%    
Debentures ₩ 70,000   70,000  
Gross amount [member] | Unsecured corporate bonds with 4.54% interest due 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2026      
Annual interest rate (%) 4.54% 4.54%    
Debentures ₩ 115,000   115,000  
Gross amount [member] | Unsecured corporate bonds with 4.68% interest due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2028      
Annual interest rate (%) 4.68% 4.68%    
Debentures ₩ 100,000   100,000  
Gross amount [member] | Unsecured corporate bonds with 4.72% interest due 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2030      
Annual interest rate (%) 4.72% 4.72%    
Debentures ₩ 50,000   50,000  
Gross amount [member] | VS Unsecured corporate bonds with 4.72% interest due 2033 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2033      
Annual interest rate (%) 4.72% 4.72%    
Debentures ₩ 30,000   30,000  
Gross amount [member] | Unsecured corporate bonds with 3.72% interest due 2027 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2027      
Annual interest rate (%) 3.72% 3.72%    
Debentures ₩ 180,000   180,000  
Gross amount [member] | Unsecured corporate bonds with 3.73% interest due 2029 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2029      
Annual interest rate (%) 3.73% 3.73%    
Debentures ₩ 110,000   110,000  
Gross amount [member] | Unsecured corporate bonds with 3.92% interest due 2034 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2034      
Annual interest rate (%) 3.92% 3.92%    
Debentures ₩ 110,000   110,000  
Gross amount [member] | Unsecured corporate bonds with 2.91 interest due 2027 [Member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2027      
Annual interest rate (%) 2.91% 2.91%    
Debentures ₩ 170,000   170,000  
Gross amount [member] | Unsecured corporate bonds with 2.92 interest due 2029 [Member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2029      
Annual interest rate (%) 2.92% 2.92%    
Debentures ₩ 90,000   90,000  
Gross amount [member] | Unsecured corporate bonds with 2.96 interest due 2034 [Member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2034      
Annual interest rate (%) 2.96% 2.96%    
Debentures ₩ 40,000   40,000  
Gross amount [member] | Unsecured corporate bonds with 1.86% interest due 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2026      
Annual interest rate (%) [3] 1.86% 1.86%    
Debentures [3] ₩ 50,000   50,000  
Gross amount [member] | Unsecured corporate bonds with 1.64% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2025      
Annual interest rate (%) [3] 1.64% 1.64%    
Debentures [3] ₩ 0   100,000  
Gross amount [member] | Unsecured corporate bonds with 1.41% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2025      
Annual interest rate (%) [3] 1.41% 1.41%    
Debentures [3] ₩ 0   160,000  
Gross amount [member] | Unsecured corporate bonds with 2.58% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2025      
Annual interest rate (%) [3] 2.58% 2.58%    
Debentures [3] ₩ 0   100,000  
Gross amount [member] | Unsecured corporate bonds with 2.92% interest due 2032 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2032      
Annual interest rate (%) [3] 2.92% 2.92%    
Debentures [3] ₩ 50,000   50,000  
Gross amount [member] | Unsecured corporate bonds with 4.21% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2025      
Annual interest rate (%) [3] 4.21% 4.21%    
Debentures [3] ₩ 0   50,000  
Gross amount [member] | Unsecured corporate bonds with 4.28% interest due 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2026      
Annual interest rate (%) [3] 4.28% 4.28%    
Debentures [3] ₩ 100,000   100,000  
Gross amount [member] | Unsecured corporate bonds with 4.37% interest due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2028      
Annual interest rate (%) [3] 4.37% 4.37%    
Debentures [3] ₩ 90,000   90,000  
Gross amount [member] | Unsecured corporate bonds with 4.87% interest due 2026 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2026      
Annual interest rate (%) [3] 4.87% 4.87%    
Debentures [3] ₩ 100,000   100,000  
Gross amount [member] | Unsecured corporate bonds with 5.00% interest due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2028      
Annual interest rate (%) [3] 5.00% 5.00%    
Debentures [3] ₩ 60,000   60,000  
Gross amount [member] | Unsecured corporate bonds with 3.89% interest due 2027 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2027      
Annual interest rate (%) [3] 3.89% 3.89%    
Debentures [3] ₩ 170,000   170,000  
Gross amount [member] | Unsecured global bonds with 6.63% interest due 2027 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2027      
Annual interest rate (%) 6.63% 6.63%    
Debentures ₩ 573,960   588,000 $ 400,000
Gross amount [member] | Unsecured global bonds with 4.88% interest due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2028      
Annual interest rate (%) 4.88% 4.88%    
Debentures [3] ₩ 430,470 $ 300,000 441,000 300,000
Gross amount [member] | Floating rate notes with SOFR rate + 1.17% interest due 2025 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2025      
Annual interest rate description [4] SOFR rate + 1.17      
Debentures [4] ₩ 0   441,000 300,000
Gross amount [member] | Floating rate notes with SOFR rate + 0.59% interest due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2028      
Annual interest rate description SOFR rate + 0.59      
Debentures ₩ 430,470 $ 300,000 0  
Gross amount [member] | Registered unsecured private exchangeable bond due 2027 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2027      
Annual interest rate (%) 0.00% 0.00%    
Debentures ₩ 7,008   0  
Gross amount [member] | Unsecured corporate bonds with 3.38% interest due 2035 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2035      
Annual interest rate (%) 3.38% 3.38%    
Debentures ₩ 50,000   0  
Gross amount [member] | Unsecured corporate bonds with 3.09% interest due 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2030      
Annual interest rate (%) 3.09% 3.09%    
Debentures ₩ 480,000   0  
Gross amount [member] | Unsecured corporate bonds with 2.97% interest due 2035 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2035      
Annual interest rate (%) 2.97% 2.97%    
Debentures ₩ 30,000   0  
Gross amount [member] | Unsecured corporate bonds with 2.87% interest due 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2030      
Annual interest rate (%) 2.87% 2.87%    
Debentures ₩ 120,000   0  
Gross amount [member] | Unsecured corporate bonds with 2.76% interest due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2028      
Annual interest rate (%) 2.76% 2.76%    
Debentures ₩ 50,000   0  
Gross amount [member] | Unsecured corporate bonds with 3.06% interest due 2035 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2035      
Annual interest rate (%) 3.06% 3.06%    
Debentures ₩ 40,000   0  
Gross amount [member] | Unsecured corporate bonds with 2.82% interest due 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2030      
Annual interest rate (%) 2.82% 2.82%    
Debentures ₩ 190,000   0  
Gross amount [member] | Unsecured corporate bonds with 2.67% interest due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2028      
Annual interest rate (%) 2.67% 2.67%    
Debentures ₩ 80,000   0  
Gross amount [member] | Unsecured corporate bonds with 3.17% interest due 2035 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2035      
Annual interest rate (%) 3.17% 3.17%    
Debentures ₩ 140,000   0  
Gross amount [member] | Unsecured corporate bonds with 3.05% interest due 2030 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2030      
Annual interest rate (%) 3.05% 3.05%    
Debentures ₩ 70,000   0  
Gross amount [member] | Unsecured corporate bonds with 2.98% interest due 2028        
Disclosure of detailed information about borrowings [line items]        
Maturity 2028      
Annual interest rate (%) 2.98% 2.98%    
Debentures ₩ 190,000   0  
Gross amount [member] | Convertible bonds due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2028      
Annual interest rate (%) [2] 0.00% 0.00%    
Debentures [2] ₩ 0   4,410 3,000
Gross amount [member] | Convertible bonds due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rate (%) [2] 0.00% 0.00%    
Debentures [2] ₩ 0   23,741 16,150
Gross amount [member] | Convertible bonds due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Debentures [2]     11,392 7,750,000
Gross amount [member] | Convertible bonds due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Debentures [2]     11,760 $ 8,000,000
Gross amount [member] | Convertible bonds due 2028 [member]        
Disclosure of detailed information about borrowings [line items]        
Maturity 2028      
Gross amount [member] | Unsecured corporate bonds with 3.93 interest due 2029 [Member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2029      
Annual interest rate (%) [3] 3.93% 3.93%    
Debentures [3] ₩ 60,000   60,000  
Gross amount [member] | Unsecured corporate bonds with 3.06 interest due 2027 [Member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2027      
Annual interest rate (%) [3] 3.06% 3.06%    
Debentures [3] ₩ 130,000   130,000  
Gross amount [member] | Unsecured corporate bonds with 3.06 interest due 2029 [Member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2029      
Annual interest rate (%) [3] 3.06% 3.06%    
Debentures [3] ₩ 115,000   115,000  
Gross amount [member] | Unsecured corporate bonds with 3.11 interest due 2031 [Member]        
Disclosure of detailed information about borrowings [line items]        
Maturity [3] 2031      
Annual interest rate (%) [3] 3.11% 3.11%    
Debentures [3] ₩ 50,000   50,000  
Discounts on bonds [member]        
Disclosure of detailed information about borrowings [line items]        
Debentures ₩ (23,004)   ₩ (15,023)  
[1] The contractual cash flow is amount that includes interest payables
[2] Convertible bonds were issued by SAPEON Inc., a subsidiary of the Parent Company, and redeemed on February 7, 2025, pursuant to an early redemption request.
[3] Unsecured corporate bonds were issued by SK Broadband Co., Ltd., a subsidiary of the Parent Company.
[4] Applied interest rates are SOFR rate of 4.20% and 4.49% as of December 31, 2025 and 2024, respectively.