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Goodwill and Other Intangible Assets, Net - Changes in Carrying Amount of Goodwill and Other Intangible Assets (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning ₩ 4,774,824 ₩ 4,714,784
Acquisitions 602,985 510,934
Business combination 554,875 282
Disposals (5,942) (106,453)
Amortization (465,935) (453,689)
Impairment loss (51,618) (47,873)
Others 84,340 156,839
Ending 5,493,529 4,774,824
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning 357,851 403,172
Acquisitions 0 0
Business combination 466,537 282
Disposals (461) 0
Amortization 0 0
Impairment loss 0 (46,958)
Others 2,845 1,355
Ending 826,772 357,851
Intellectual property rights [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning 3,247,517 3,029,651
Acquisitions 377,414 353,175
Business combination 0 0
Disposals (4) (240)
Amortization (289,446) (272,730)
Impairment loss (30,426) 0
Others 70,603 137,661
Ending 3,375,658 3,247,517
Memberships [Member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning 136,108 138,184
Acquisitions 7,243 1,716
Business combination 0 0
Disposals (4,892) (4,179)
Amortization (238) (180)
Impairment loss (519) 29
Others 1,536 538
Ending 139,238 136,108
Development expense [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning 95,041 126,818
Acquisitions 12,089 15,913
Business combination 0 0
Disposals 0 (22)
Amortization (50,481) (63,684)
Impairment loss (6,124) (692)
Others 150,228 16,708
Ending 200,753 95,041
Port facilities usage rights [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning 167,996 182,411
Acquisitions 0 0
Business combination 0 0
Disposals 0 0
Amortization (14,844) (14,415)
Impairment loss 0 0
Others 0 0
Ending 153,152 167,996
Exploration and evaluation assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning 115,309 163,446
Acquisitions 44,097 21,024
Business combination 0 0
Disposals (22) 0
Amortization 0 0
Impairment loss (14,548) 0
Others 2,177 (69,161)
Ending 147,013 115,309
Development assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning 86,711 10,235
Acquisitions 0 543
Business combination 0 0
Disposals 0 0
Amortization 0 (76)
Impairment loss 0 0
Others (3,370) 76,009
Ending 83,341 86,711
Customer relationships [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning 145,699 196,895
Acquisitions 0 0
Business combination 0 0
Disposals 0 0
Amortization (42,068) (44,478)
Impairment loss 0 0
Others 12,615 (6,718)
Ending 116,246 145,699
Other intangible assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning 422,592 463,972
Acquisitions 162,142 118,563
Business combination 88,338 0
Disposals (563) (102,012)
Amortization (68,858) (58,126)
Impairment loss (1) (252)
Others (152,294) 447
Ending ₩ 451,356 ₩ 422,592