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Related Party Transactions - Compensation to Directors and Other Key Management Personnel (Detail) - TWD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of transactions between related parties [abstract]      
Short-term employee benefits $ 4,447.5 $ 3,492.3 $ 4,369.1
Post-employment benefits 3.8 3.9 3.0
Share-based payments 1,357.4 525.8 286.2
Compensation of key management personnel $ 5,808.7 $ 4,022.0 $ 4,658.3