v3.26.1
Financial Risk Management - Schedule of Financial Assets and Liabilities Exposed in Foreign Currency Risk (Details)
₩ in Millions
Dec. 31, 2025
KRW (₩)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
JPY (¥)
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
IDR (Rp)
Dec. 31, 2025
THB (฿)
Dec. 31, 2025
VND (₫)
Dec. 31, 2025
HKD ($)
Dec. 31, 2025
MYR (RM)
Dec. 31, 2025
GBP (£)
Dec. 31, 2024
KRW (₩)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
JPY (¥)
Dec. 31, 2024
EUR (€)
Dec. 31, 2024
IDR (Rp)
Dec. 31, 2024
THB (฿)
Dec. 31, 2024
VND (₫)
Dec. 31, 2024
HKD ($)
Disclosure of detailed information about financial instruments [line items]                                    
Financial assets ₩ 683,628                   ₩ 642,739              
Currency risk                                    
Disclosure of detailed information about financial instruments [line items]                                    
Financial assets 110,056                   107,747              
Financial liabilities 27,708                   43,632              
USD | Currency risk                                    
Disclosure of detailed information about financial instruments [line items]                                    
Financial assets 107,127 $ 74,570,304,000,000                 103,021 $ 70,136,599,000,000            
Financial liabilities 27,138 $ 18,911,133,000,000                 43,009 $ 29,286,354,000,000            
JPY | Currency risk                                    
Disclosure of detailed information about financial instruments [line items]                                    
Financial assets 2,845   ¥ 309,989,470,000,000               4,654   ¥ 496,929,791,000,000          
Financial liabilities 410   ¥ 44,698,337,000,000               525   ¥ 56,100,772,000,000          
EUR | Currency risk                                    
Disclosure of detailed information about financial instruments [line items]                                    
Financial assets 46     € 27,179,000,000             43     € 27,925,000,000        
Financial liabilities 76     € 45,155,000,000             50     € 32,910,000,000        
IDR | Currency risk                                    
Disclosure of detailed information about financial instruments [line items]                                    
Financial assets 0       Rp 9,851,056,000,000           1       Rp 9,851,056,000,000      
Financial liabilities 61       Rp 711,971,835,000,000           48       Rp 522,083,448,000,000      
THB | Currency risk                                    
Disclosure of detailed information about financial instruments [line items]                                    
Financial assets 1         ฿ 21,131,000,000         1         ฿ 21,131,000,000    
Financial liabilities 0         ฿ 0         0         ฿ 0    
VND | Currency risk                                    
Disclosure of detailed information about financial instruments [line items]                                    
Financial assets 0           ₫ 6,026,400,000,000       0           ₫ 6,026,400,000,000  
Financial liabilities 0           ₫ 0       0           ₫ 0  
HKD | Currency risk                                    
Disclosure of detailed information about financial instruments [line items]                                    
Financial assets 37             $ 197,522,000,000     27             $ 141,271
Financial liabilities 0             $ 0     ₩ 0             $ 0
MYR | Currency risk                                    
Disclosure of detailed information about financial instruments [line items]                                    
Financial assets 0               RM 0                  
Financial liabilities 9               RM 24,358,000,000                  
GBP | Currency risk                                    
Disclosure of detailed information about financial instruments [line items]                                    
Financial assets 0                 £ 0                
Financial liabilities ₩ 14                 £ 7,182,000,000