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Investment Property, Net - Summary of Investment Property (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about investment property [line items]      
Investment property ₩ 1,691,625 ₩ 1,955,896 ₩ 1,616,294
Land [member]      
Disclosure of detailed information about investment property [line items]      
Investment property 794,740 866,450 787,304
Buildings [member]      
Disclosure of detailed information about investment property [line items]      
Investment property 752,471 942,851 655,786
Structures [member]      
Disclosure of detailed information about investment property [line items]      
Investment property 1,210 1,755 1,873
Right of use assets [member]      
Disclosure of detailed information about investment property [line items]      
Investment property 143,204 144,840 ₩ 171,331
Gross amount [member]      
Disclosure of detailed information about investment property [line items]      
Investment property 2,001,417 2,242,009  
Gross amount [member] | Land [member]      
Disclosure of detailed information about investment property [line items]      
Investment property 804,839 876,549  
Gross amount [member] | Buildings [member]      
Disclosure of detailed information about investment property [line items]      
Investment property 1,002,446 1,173,721  
Gross amount [member] | Structures [member]      
Disclosure of detailed information about investment property [line items]      
Investment property 2,455 3,342  
Gross amount [member] | Right of use assets [member]      
Disclosure of detailed information about investment property [line items]      
Investment property 191,677 188,397  
Accumulated depreciation, amortization and impairment [member]      
Disclosure of detailed information about investment property [line items]      
Investment property (309,792) (286,113)  
Accumulated depreciation, amortization and impairment [member] | Land [member]      
Disclosure of detailed information about investment property [line items]      
Investment property (10,099) (10,099)  
Accumulated depreciation, amortization and impairment [member] | Buildings [member]      
Disclosure of detailed information about investment property [line items]      
Investment property (249,975) (230,870)  
Accumulated depreciation, amortization and impairment [member] | Structures [member]      
Disclosure of detailed information about investment property [line items]      
Investment property (1,245) (1,587)  
Accumulated depreciation, amortization and impairment [member] | Right of use assets [member]      
Disclosure of detailed information about investment property [line items]      
Investment property ₩ (48,473) ₩ (43,557)