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Financial Instruments - Detailed Information About In Maturity Analysis For Lease Liabilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Lease liabilities $ 21,754.4 $ 22,589.1
5-10 years [member]    
Disclosure of detailed information about financial instruments [line items]    
Lease liabilities 10,197.5 10,241.7
10-15 years [member]    
Disclosure of detailed information about financial instruments [line items]    
Lease liabilities 7,121.6 7,329.0
15-20 years [member]    
Disclosure of detailed information about financial instruments [line items]    
Lease liabilities 4,117.1 4,233.9
More than 20 years [member]    
Disclosure of detailed information about financial instruments [line items]    
Lease liabilities $ 318.2 $ 784.5