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Property and equipment (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment [line items]      
Land ₩ 1,965,541 ₩ 2,028,761  
Buildings 899,467 738,626  
Other assets 520,151 514,955  
Right-of-use assets 768,027 875,250  
Total 4,153,186 4,157,592 ₩ 3,972,304
Acquisition cost      
Disclosure of detailed information about property, plant and equipment [line items]      
Land 1,965,541 2,028,761  
Buildings 1,516,346 1,314,682  
Other assets 2,585,776 2,482,527  
Right-of-use assets 1,782,396 1,717,665  
Total 7,850,059 7,543,635  
Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment [line items]      
Land 0 0  
Buildings (605,249) (565,350)  
Other assets (2,065,625) (1,967,572)  
Right-of-use assets (1,014,369) (842,415)  
Total (3,685,243) (3,375,337)  
Accumulated Impairment      
Disclosure of detailed information about property, plant and equipment [line items]      
Land 0 0  
Buildings (11,630) (10,706)  
Other assets 0 0  
Right-of-use assets 0 0  
Total ₩ (11,630) ₩ (10,706)