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Financial Instruments - Financing Facilities (Detail) - TWD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Unsecured loans and commercial paper payable [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Facility of unsecured bank loan and commercial paper payable, amount used $ 65 $ 7,068
Facility of unsecured/secured bank loan and commercial paper payable, amount unused 61,620 59,277
Facility of unsecured bank loan and commercial paper payable 61,685 66,345
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 0 20
Facility of secured bank loan facility $ 1,600 $ 1,620