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Financial Risk Management - Schedule of Financial Assets and Liabilities Exposed in Foreign Currency Risk (Details)
₩ in Millions
Dec. 31, 2023
KRW (₩)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
JPY (¥)
Dec. 31, 2023
EUR (€)
Dec. 31, 2023
IDR (Rp)
Dec. 31, 2023
THB (฿)
Dec. 31, 2023
VND (₫)
Dec. 31, 2023
HKD ($)
Dec. 31, 2022
KRW (₩)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
JPY (¥)
Dec. 31, 2022
EUR (€)
Dec. 31, 2022
IDR (Rp)
Dec. 31, 2022
THB (฿)
Dec. 31, 2022
VND (₫)
Disclosure of detailed information about financial instruments [line items]                              
Financial assets ₩ 538,780               ₩ 419,692            
Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Financial assets 114,833               69,320            
Financial liabilities 37,854               11,467            
USD | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Financial assets 111,616 $ 86,681,440,000,000             64,351 $ 50,865,141,000,000          
Financial liabilities 36,344 $ 28,203,218,000,000             10,832 $ 8,528,692,000,000          
JPY | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Financial assets 3,139   ¥ 343,984,702,000,000           4,932   ¥ 517,431,793,000,000        
Financial liabilities 1,467   ¥ 160,779,008,000,000           527   ¥ 55,296,530,000,000        
EUR | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Financial assets 52     € 36,780,000,000         35     € 25,839,000,000      
Financial liabilities 43     € 30,472,000,000         51     € 37,607,000,000      
IDR | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Financial assets 1       Rp 12,955,000,000,000       1       Rp 12,955,000,000,000    
Financial liabilities 0       Rp 3,103,944,000,000       57       Rp 703,608,946,000,000    
THB | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Financial assets 1         ฿ 28,510,000,000     1         ฿ 28,510,000,000  
Financial liabilities 0         ฿ 7,379,000,000     0         ฿ 7,379,000,000  
VND | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Financial assets 0           ₫ 9,270,000,000,000   0           ₫ 9,270,000,000,000
Financial liabilities 0           ₫ 3,243,600,000,000   ₩ 0           ₫ 3,243,600,000,000
HKD | Currency risk                              
Disclosure of detailed information about financial instruments [line items]                              
Financial assets 24             $ 144,997              
Financial liabilities ₩ 0             $ 0