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Operating Segments - Revenue and Non-current Assets by Geographic Area (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of geographical areas [line items]      
Revenue ₩ 68,986,938 ₩ 73,459,408 ₩ 77,056,549
Non-current assets 49,477,974 46,577,548  
Domestic [member]      
Disclosure of geographical areas [line items]      
Non-current assets 34,594,834 33,512,812  
Japan [member]      
Disclosure of geographical areas [line items]      
Non-current assets 126,582 131,086  
China [member]      
Disclosure of geographical areas [line items]      
Non-current assets 1,074,438 1,140,136  
Indonesia [Member]      
Disclosure of geographical areas [line items]      
Non-current assets 3,416,737 3,036,954  
Asia-other [member]      
Disclosure of geographical areas [line items]      
Non-current assets 1,950,162 1,698,956  
North America [member]      
Disclosure of geographical areas [line items]      
Non-current assets 2,400,911 1,857,787  
Europe [Member]      
Disclosure of geographical areas [line items]      
Non-current assets 324,813 302,775  
Other countries [member]      
Disclosure of geographical areas [line items]      
Non-current assets 5,589,497 4,897,042  
External customers [member]      
Disclosure of geographical areas [line items]      
Revenue (107,948) 771,265 (70,648)
Reportable segments [member]      
Disclosure of geographical areas [line items]      
Revenue 117,240,806 125,013,953 127,080,006
Reportable segments [member] | External customers [member]      
Disclosure of geographical areas [line items]      
Revenue 69,094,886 72,688,143 77,127,197
Reportable segments [member] | External customers [member] | Domestic [member]      
Disclosure of geographical areas [line items]      
Revenue 42,516,707 45,960,140 50,658,510
Reportable segments [member] | External customers [member] | Japan [member]      
Disclosure of geographical areas [line items]      
Revenue 2,590,102 2,814,631 2,691,788
Reportable segments [member] | External customers [member] | China [member]      
Disclosure of geographical areas [line items]      
Revenue 5,160,583 5,737,686 6,152,191
Reportable segments [member] | External customers [member] | Indonesia [Member]      
Disclosure of geographical areas [line items]      
Revenue 2,873,999 3,156,962 3,422,647
Reportable segments [member] | External customers [member] | Asia-other [member]      
Disclosure of geographical areas [line items]      
Revenue 7,751,121 7,382,157 7,287,382
Reportable segments [member] | External customers [member] | North America [member]      
Disclosure of geographical areas [line items]      
Revenue 2,780,769 2,504,563 2,095,705
Reportable segments [member] | External customers [member] | Europe [Member]      
Disclosure of geographical areas [line items]      
Revenue 3,065,738 2,743,528 2,468,508
Reportable segments [member] | External customers [member] | Other countries [member]      
Disclosure of geographical areas [line items]      
Revenue ₩ 2,355,867 ₩ 2,388,476 ₩ 2,350,466