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Significant Loss from Disaster -Additional Inormation (Detail) - TWD ($)
$ in Billions
1 Months Ended 3 Months Ended
Jan. 31, 2025
Jun. 30, 2024
Earthquakes [Member]    
Disclosure of non-adjusting events after reporting period [line items]    
Loss due to unexpected event $ 5.3 $ 3.0