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Investment Property, Net - Changes in Carrying Amount of Investment Property (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about investment property [line items]    
Beginning ₩ 1,955,896 ₩ 1,616,294
Acquisitions 4,354 5,537
Business Combination   414,921
Disposals (1,393) (81,663)
Depreciation (27,677) (41,637)
Impairment loss (2,553) (9,991)
Others (237,002) 52,435
Ending 1,691,625 1,955,896
Land [member]    
Disclosure of detailed information about investment property [line items]    
Beginning 866,450 787,304
Acquisitions 163 3,755
Business Combination   59,766
Disposals (510) (47,137)
Depreciation 0  
Impairment loss   (215)
Others (71,363) 62,977
Ending 794,740 866,450
Buildings [member]    
Disclosure of detailed information about investment property [line items]    
Beginning 942,851 655,786
Acquisitions 2,727 1,782
Business Combination   355,155
Disposals (607) (34,419)
Depreciation (21,147) (34,179)
Impairment loss (2,553) (9,776)
Others (168,800) 8,502
Ending 752,471 942,851
Structures [member]    
Disclosure of detailed information about investment property [line items]    
Beginning 1,755 1,873
Depreciation (909) (911)
Impairment loss 0 0
Others 364 793
Ending 1,210 1,755
Right of use assets [member]    
Disclosure of detailed information about investment property [line items]    
Beginning 144,840 171,331
Acquisitions 1,464 0
Disposals (276) (107)
Depreciation (5,621) (6,547)
Impairment loss 0 0
Others 2,797 (19,837)
Ending ₩ 143,204 ₩ 144,840