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Additional Information of Statement of Cash Flows - Changes in Liabilities Arising from Financial Activities (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Interest expenses ₩ 1,091,462 ₩ 1,051,511 ₩ 1,001,290
Short-term borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning 5,733,091 4,959,280  
Changes from financing cash flows 2,158,541 (217,759)  
Effect of changes in foreign exchange rates (459,675) 991,570  
Changes in fair values 0 0  
Ending 7,431,957 5,733,091 4,959,280
Long-term borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning 20,264,276 21,011,099  
Changes from financing cash flows 235,005 (1,633,370)  
Effect of changes in foreign exchange rates 549,426 1,102,079  
Changes in fair values 1,310 (239,120)  
Loss on bond redemption   7,063  
Interest expenses 10,026 16,525  
Ending 21,060,043 20,264,276 21,011,099
Dividend payable [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning 4,182 3,261  
Changes from financing cash flows (915,216) (844,195)  
Effect of changes in foreign exchange rates 14 991  
Decrease in retained earnings 756,208 758,124  
Decrease in non-controlling interest 159,410 86,001  
Ending 4,598 4,182 3,261
Finance lease liabilities [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning 906,101 924,320  
Changes from financing cash flows (143,423) (195,367)  
Effect of changes in foreign exchange rates (131,796) (3,696)  
Interest expenses 63,416 48,625  
Increase in lease assets 646,356 132,219  
Ending 1,340,654 906,101 924,320
Derivatives that hedge borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning (782,567) (129,991)  
Changes from financing cash flows 242,154 181,397  
Changes in fair values (53,809) (833,973)  
Ending ₩ (594,222) ₩ (782,567) ₩ (129,991)