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Financial Instruments - Financing Facilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Unsecured Bank Loan Facilities [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Facility of unsecured bank loan and commercial paper payable, amount used $ 250 $ 585
Facility of unsecured/secured bank loan and commercial paper payable, amount unused 56,438 56,191
Facility of unsecured bank loan and commercial paper payable 56,688 56,776
Secured loans [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Facility of secured bank loan facility, amount used 1,600 1,600
Facility of unsecured/secured bank loan and commercial paper payable, amount unused 15 20
Facility of secured bank loan facility $ 1,615 $ 1,620