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Material accounting policies (Tables)
 12 Months Ended
Dec. 31, 2025
Disclosure of material accounting policies [Abstract]  
Intangible assets, estimated useful lives
Descriptions
   
Useful lives
Software
    5 years
Capitalized development cost
    5 ~ 10 years
Other intangible assets
   
5 years
or
contract periods
Summary of other property and equipment are depreciated on a straight-line basis
Descriptions
   
Useful lives
Buildings
    40 ~ 50 years
Other properties
    4 ~ 5 years
Summary of depreciation method and the estimated useful lives
Descriptions
   
Useful lives
   
Depreciation method
Buildings
    40 ~ 50 years   
Straight-line