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Income tax expense - Summary of Detailed Information about Expiration Date of unused carried tax losses not recognized as deferred tax assets Explanatory (Details)
₩ in Millions
Dec. 31, 2025
KRW (₩)
Disclosure of Detailed Information about Expiration Date of unused carried tax losses not recognized as deferred tax assets [Line Items]  
Tax loss carried-forward ₩ 127,875
1 year or less  
Disclosure of Detailed Information about Expiration Date of unused carried tax losses not recognized as deferred tax assets [Line Items]  
Tax loss carried-forward 7,444
1~2 years [member]  
Disclosure of Detailed Information about Expiration Date of unused carried tax losses not recognized as deferred tax assets [Line Items]  
Tax loss carried-forward 9,253
2~3 years [member]  
Disclosure of Detailed Information about Expiration Date of unused carried tax losses not recognized as deferred tax assets [Line Items]  
Tax loss carried-forward 12,361
More than 3 years [member]  
Disclosure of Detailed Information about Expiration Date of unused carried tax losses not recognized as deferred tax assets [Line Items]  
Tax loss carried-forward ₩ 98,817